Click to return to Home page

Google Adsense Privacy Policy

Search This Site

Mercury

Venus

Mars

Jupiter

Saturn

Uranus

Neptune

Pluto

Find Jupiter in your Local Night Sky using AstroViewer®

Jupiter Opposition Data, 2015-2018

Position of Jupiter's four brightest Moons

Jupiter Conjunctions with other Planets, 2014-2020

Jupiter Through the Telescope

Jupiter Transit Altitudes, 2015-2018

Moon near Jupiter Dates 2014

The Current Night Sky Over...

Advertise on this Site

Mobile (Smartphone) Site

Where is Jupiter now? This star map shows the path of Jupiter through Cancer, Leo, Virgo and Libra from September 2014 to November 2018 (Copyright Martin J Powell, 2014)

 

The path of Jupiter against the background stars of Cancer, Leo, Virgo and Libra from September 2014 to November 2018, with positions marked on the 1st of each month. Periods when the planet is unobservable (i.e. when it is too close to the Sun, or passes behind it) are indicated by a dashed line; hence the planet becomes lost from view (in the evening sky) in early August 2015 and becomes visible again (in the morning sky) in mid-September 2015. The chart shows the changing shape of a planet's apparent looping formation as it moves through the zodiac. Having crossed the ecliptic (the apparent path of the Sun, Moon and planets) in a Northward direction in late 2013, Jupiter describes a hybrid loop (half loop, half zig-zag) on the Cancer-Leo  border in 2014-15, followed by three Northward-facing loops as it heads Southward through Leo, Virgo and Libra over the next three years. The star map applies to observers in the Northern hemisphere (i.e. North is up); for the Southern hemisphere view, click here. The faintest stars on the map have an apparent magnitude of about +4.8. Printer-friendly versions of this chart are available for Northern and Southern hemisphere views. Astronomical co-ordinates of Right Ascension (longitude, measured Eastwards in hrs:mins from the First Point of Aries) and Declination (latitude, measured in degrees North or South of the celestial equator) are marked around the border of the chart. Night sky photographs of the region can be seen below; descriptions of the deep-sky objects  in Cancer, Leo and Virgo which are marked on the chart can be found here.

The Position of Jupiter in the Night Sky, 2014 to 2018 by Martin J Powell

Having spent the 2013-14 observing period among the stars of the zodiac's most Northerly constellation of Gemini, the Twins, Jupiter re-appears in the dawn sky in August 2014 in the neighbouring constellation of Cancer, the Crab, positioned not far from the celebrated star cluster named Praesepe or The Beehive (Messier 44 or NGC 2632).

Jupiter describes its 2014-15 'hybrid' loop on the Cancer-Leo border, the planet crossing into Leo, the Lion, in mid-October 2014 and attaining its Eastern stationary point in December of that year. The planet retrogrades (moves East to West) back into Cancer in early February 2015 and just 2 days later reaches opposition some 17' (17 arcminutes or 0°.3, where 1 arcminute = 1/60th of a degree) from Cancer's Eastern border. Western stationary point is reached in April 2015, after which the planet resumes direct motion (West to East) and re-enters Leo two months later. Jupiter heads out of view in the evening twilight in early August 2015, the planet passing just to the North of Leo's brightest star Regulus (Greek lower-case letter 'alpha' Leonis, mag. +1.3) soon afterwards.

Jupiter imaged by Efrain Morales Rivera in February 2014 (Image: Efrain Morales Rivera/Jaicoa Observatory)

Jupiter imaged by Puerto Rican amateur astronomer Efrain Morales Rivera on February 27th 2014 using an 8-inch Ritchey-Chrétien telescope fitted with a CCD camera (Image: Jaicoa Observatory)

Jupiter re-appears in the dawn sky in mid-September 2015, positioned in central Southern Leo, marking the start of the planet's 2015-16 apparition. The planet reaches its January 2016 Eastern stationary point just inside Leo's Eastern border, then retrogrades towards a March opposition positioned just 40' (0°.7) West of the star Sigma Leonis (Greek lower-case letter 'sigma' Leo, mag. +4.0), the rear paw of the Lion. Western stationary point is reached in May 2016, after which the planet resumes direct motion, entering Virgo, the Virgin, in early August. Jupiter becomes lost in the evening twilight during early September, crossing the celestial equator - where the declination is 0° (Greek lower-case letter 'delta' = 0°) - in mid-September. Six days later, the planet passes through its 2016 superior conjunction, when it is positioned directly behind the Sun as seen from the Earth.

Jupiter emerges in the dawn Eastern sky in mid-October 2016, heralding the 2016-17 apparition which sees the planet occupying central Virgo throughout. In early 2017 the planet is positioned around 4° North of the constellation's brightest star Spica (Greek lower-case letter 'alpha' Vir or Alpha Virginis, mag. +1.0) and moving in a South-easterly direction against the background stars. Eastern stationary point is reached in early February, after which the planet turns retrograde and heads North-westwards, passing North of Spica a second time around mid-month. Opposition takes place in early April, positioned just 16' (0°.3) West of the double star Theta Virginis (Greek lower-case letter 'theta' Vir, mag. +4.4). After reaching Western stationary point in June the planet resumes direct motion, heading South-easterly again and passing North of Spica for a third and final time in early September. The 2016-17 apparition ends in early October, as Jupiter sinks into the Western sky at dusk.

As 2017 draws to a close, Jupiter re-emerges in the dawn sky and the 2017-18 apparition commences, the planet having just entered the constellation of Libra, the Balance. The entire apparition takes place within the confines of this unremarkable constellation, the planet's Northward-facing loop being described to the North and East of its second-brightest star Zuben Elgenubi (Greek lower-case letter 'alpha' Lib or Alpha Librae, mag. +2.7). In mid-December 2017 Jupiter is a morning object and passes less than a degree North of the star. At the start of 2018 the planet is positioned around 2° East of it, continuing South-eastwards to reach its Eastern stationary point in March. The planet turns retrograde and heads North-westwards, reaching opposition in early May, some 3° East of Zuben Elgenubi. The planet passes North of the star again in early June then reaches its Western stationary point in mid-July. Having resumed direct motion Jupiter proceeds South-eastwards and passes North of Zuben Elgenubi one more time in mid-August. The 2017-18 apparition closes as Jupiter disappears into the evening twilight in early November 2018. Soon afterwards, the King of the Planets leaves Libra and heads into the Southernmost constellations of the zodiac.

Jupiter in Gemini, the Twins photographed by the author two days before the planet's opposition in January 2014. Jupiter was positioned in Gemini for a little over a year between 2013 and 2014, reaching its highest point in the zodiac in March 2014. Throughout the period the planet formed a variety of triangle shapes with the constellation's two brightest stars Castor and Pollux (Roll your pointer over the image for an annotated version and click on the thumbnail for the full-size photo).

Jupiter in central Gemini in January 2014 (Copyright Martin J Powell 2014)

 

Jupiter Opposition Data, 2015 to 2018

Jupiter reaches opposition to the Sun (when it is closest to the Earth and brightest in the sky for any given apparition) every 398.9 days on average, i.e. about 33½ days later in each successive year. For the period covered by the above star map, oppositions take place on February 6th 2015, March 8th 2016, April 7th 2017 and May 9th 2018. Around opposition, the planet is due South at local midnight in the Northern hemisphere (due North at local midnight in the Southern hemisphere).

The apparent magnitude of the planet at opposition during the period of the star chart is -2.4 (in 2015) and -2.3 (in 2016, 2017 and 2018). Jupiter's apparent size (i.e. its angular width as seen from the Earth, measured in arcseconds, where 1 arcsecond = 1/3600 of a degree) at opposition is 45".3 (in 2015) reducing to 44".4 (in 2016), 44".2 (in 2017) and then increasing to 44".8 (in 2018).

Because of Jupiter's rapid rotation speed, its disk appears as an oblate spheroid through telescopes and high-magnification binoculars (i.e. it appears flattened at the poles and bulged at the equator). The dimension given above is the apparent equatorial diameter of the planet; its apparent polar diameter is about 6.3% less.

Superior conjunction (when Jupiter passes behind the Sun as seen from the Earth) takes place on August 26th 2015, September 26th 2016, October 26th 2017 and November 26th 2018. The planet is not visible from Earth for about two weeks on either side of these dates. At superior conjunction the magnitude fades by one whole magnitude to -1.5 (in 2015, 2016 and 2017) brightening slightly to -1.6 (in 2018) and the planet's apparent diameter is 30".8 (in 2015), 30".5 (in 2016), 30".6 (in 2017) and 31".1 (in 2018).

Data relating to Jupiter's oppositions from 2015 to 2018 are provided in the table below.

[Terms in yellow italics are explained in greater detail in an associated article describing planetary movements in the night sky.]

 

Apparition

Period

Opposition Circumstances

Superior

Conjunction

Opposition

Date

Constellation

Declination

Apparent

Magnitude

Diameter (arcsecs)

Tilt

View from

Earth

(North up)

Distance (AU)*

Equatorial

Polar

from Earth

from Sun

2014/15

2015 Feb 6

Astrological symbol for Cancer (Image from www.4yeo.com)

Cnc

+16°.5

-2.4

45".3

42".4

-0°.2

Jupiter as seen from the Earth at opposition on 2015 February 6 (Image from NASA/JPL's Solar System Simulator v4)

4.3462

5.3319

2015 Aug 26

2015/16

2016 Mar 8

Astrological symbol for Leo (Image from www.4yeo.com)

Leo

+5°.9

-2.3

44".4

41".6

-1°.8

Jupiter as seen from the Earth at opposition on 2016 March 8 (Image from NASA/JPL's Solar System Simulator v4)

4.4354

5.4277

2016 Sep 26

2016/17

2017 Apr 7

Astrological symbol for Virgo (Image from www.4yeo.com)

Vir

-5°.7

-2.3

44".2

41".4

-3°.0

Jupiter as seen from the Earth at opposition on 2017 April 7 (Image from NASA/JPL's Solar System Simulator v4)

4.4554

5.4559

2017 Oct 26

2017/18

2018 May 9

Astrological symbol for Libra (Image from www.4yeo.com)

Lib

-16°.0

-2.3

44".8

41".9

-3°.3

Jupiter as seen from the Earth at opposition on 2018 May 9 (Image from NASA/JPL's Solar System Simulator v4)

4.4001

5.4093

2018 Nov 26

* 1 AU (Astronomical Unit) = 149,597,870 kms (92,955,807 statute miles)

Jupiter opposition data for the period 2015 to 2018. The Declination is the angle of the planet to the North (+) or South (-) of the celestial equator; on the star chart, it represents the planet's angular distance above or below the blue line. The angular diameter (or apparent size) of the planet as seen from Earth is given in arcseconds (where 1 arcsecond = 1/3600th of a degree). The Polar Diameter is 6.3% less than the Equatorial Diameter because Jupiter is an oblate spheroid. Jupiter's opposition distance from Earth slowly increases through to 2017, so that its angular diameter at opposition shrinks slightly year by year. This is reflected in the planet's apparent magnitude (brightness) which fades slightly over the same period. The planet passes through aphelion - its most distant orbital point from the Sun - in February 2017. From 2018, Jupiter's opposition distance from Earth begins to reduce once more. The Tilt (the inclination of Jupiter's rotational axis relative to the Earth's orbital plane) is positive (+) when Jupiter's Northern hemisphere is tipped towards the Earth and negative (-) when its Southern hemisphere is tipped towards the Earth; the maximum value it can attain is ±3°.4. The Tilt values were obtained from NASA's Jupiter Ephemeris Generator 2.5. All other data was obtained from 'Redshift' and 'SkyGazer Ephemeris' software. The Jupiter images were obtained from NASA's Solar System Simulator v4.0.

 

 ^ Back to Top of Page

 

 

 

 

Jupiter Conjunctions with other Planets, August 2014 to December 2020

Viewed from the orbiting Earth, whenever two planets appear to pass each other in the night sky (a line-of-sight effect) the event is known as a conjunction or an appulse. However, not all conjunctions will be visible from the Earth because many of them take place too close to the Sun. Furthermore, not all conjunctions will be seen from across the world; the observers' latitude will affect the altitude (angle above the horizon) at which the two planets are seen at the time of the event, and the local season will affect the sky brightness at that particular time. A flat, unobstructed horizon will normally be required to observe most of them.

Conjunctions between Jupiter and Venus are perhaps the most spectacular of all to view and the most photogenic. Between August 2014 and December 2020 there are eight occasions when these two planets can be seen together. Three of the eight take place when Venus is more than 40° from the Sun. The conjunction of October 26th 2015 is particularly good for Northern hemisphere observers, that of July 1st 2015 is particularly good for Southern hemisphere observers, whilst the conjunction of January 22nd 2019 is good for both hemispheres. The October 26th 2015 conjunction takes place on the very same day as Venus' greatest Western elongation, whilst that of January 22nd 2019 takes place only two weeks after its greatest Western elongation.

Three conjunctions of Jupiter with Mars take place during the period in question, all of them morning events. For Northern hemisphere observers the conjunction of October 17th 2015 is the best, with Venus joining in the spectacle several degrees away. For Southern hemisphere observers the March 20th 2020 conjunction is best, the two planets being positioned almost 70° away from the Sun in the constellation of Sagittarius. This is also the brightest conjunction of the three, with Saturn being positioned not far away. The Jupiter-Mars conjunction of January 7th 2018 is favourable for both hemispheres, the separation between the two planets (12 arcminutes or 0°.2) being the closest of the three.

The rarest of the conjunctions during the period is that between the giant planets Jupiter and Saturn in December 2020. Known historically as Great Conjunctions, Jupiter-Saturn conjunctions take place about every twenty years, the last one having been in May 2000. However, they are not always best placed for viewing, sometimes taking place at narrow solar elongations. The most spectacular conjunctions between these two planets occur when they are both within days of opposition, at which time they are particularly bright and visible throughout the night. Such events are very rare however, taking place about every 139 years or so (the next will be in the year 2238). Perhaps the best-known conjunction between Jupiter and Saturn was that in the year 7 BC, in the constellation of Pisces, the Fishes. In the early seventeenth century the German astronomer Johannes Kepler (1571-1630) suggested that this event might have been the origin of the Star of Bethlehem, referred to in St Matthew's Gospel of the Bible. Specifically, this was a triple conjunction - a series of three conjunctions which took place between May and December of that year - which, it is argued, was such an unusual chain of events that the Magi (the 'wise men' or astrologers) gave it a special significance. Critics of this theory say, among other things, that the two planets were too far apart to attract any particular attention, their angular separation at best having been about 1° (about two apparent Full Moon diameters).

The 'Great Conjunction' of December 2020 takes place on the day of Earth's winter solstice, the planets being only 30° away from the Sun in the evening sky. Whilst not ideally placed for viewing and being well past their opposition dates, Jupiter and Saturn are separated by only 6 arcminutes (0°.1), making them excellent photographic targets through the eyepiece of a telescope. After 2020, they will next meet in November 2040 in the constellation of Virgo, the Virgin.

The following table lists the conjunctions involving Jupiter which take place at solar elongations of greater than 15°. In several cases, other planets and/or stars are also in the vicinity and these are detailed. Note that, because some of the conjunctions occur in twilight, the planets involved may not appear as bright as their listed magnitude suggests.

Table listing Jupiter conjunctions with other planets from August 2014 to December 2020 (Copyright Martin J Powell, 2014)

Jupiter conjunctions with other planets from August 2014 to December 2020  The column headed 'UT' is the Universal Time (equivalent to GMT) of the conjunction (in hrs : mins). The separation (column 'Sep') is the angular distance between the two planets, measured relative to Jupiter, e.g. on 2016 Aug 27, Venus is positioned 0°.1 North of Jupiter at the time shown. The 'Fav. Hem' column shows the Hemisphere in which the conjunction will be best observed (Northern, Southern and/or Equatorial). The expression 'Not high N Lats' indicates that observers at latitudes further North than about 45°N will find the conjunction difficult or impossible to observe because of low altitude and/or bright twilight.

In the 'When Visible' column, a distinction is made between Dawn/Morning visibility and Dusk/Evening visibility; the terms Dawn/Dusk refer specifically to the twilight period before sunrise/after sunset, whilst the terms Evening/Morning refer to the period after darkness falls/before twilight begins (some conjunctions take place in darkness, others do not, depending upon latitude). The 'Con' column shows the constellation in which the planets are positioned at the time of the conjunction.

To find the direction in which the conjunctions will be seen on any of the dates in the table, note down the constellation in which the planets are located ('Con' column) on the required date and find the constellation's rising direction (for Dawn/Morning apparitions) or setting direction (for Dusk/Evening apparitions) for your particular latitude in the Rise-Set direction table.

Although any given conjunction takes place at a particular instant in time, it is worth pointing out that, because of the planets' relatively slow daily motions, such events are interesting to observe for several days both before and after the actual conjunction date.

There are in fact two methods of defining a planetary conjunction date: one is measured in Right Ascension (i.e. along the celestial equator) and the other is measured along the ecliptic, which is inclined at 23½° to the Earth's equatorial plane (this is due to the tilt of the Earth's axis in space). An animation showing how conjunction dates are determined by each method can be found on the Jupiter-Uranus 2010-11 triple conjunction page. Although conjunction dates measured along the ecliptic are technically more accurate (separations between planets can be significantly closer) the Right Ascension method is the more commonly used, and it is the one which is adopted here.

^ Back to Top of Page

Optical Instruments for Astronomy

SkyWatcher

Mercury 707

70mm Refractor

Telescope

SkyWatcher

Celestron

Travel Scope

70 Refractor

Telescope

Celestron

Coleman

700-76 EQ2

Reflector

Telescope

Coleman / Rokinon

Orion

Scenix

7 x 50

Binoculars

Orion

Nikon Action

EX Extreme

12 x 60 ATB

Binoculars

Nikon

Barska

20 x 80

WP Cosmos

Binoculars

Barska

Konus

Giant

20 x 80

Binoculars

Konus

Buy at

Buy at

Buy at

Buy at

Buy at

Buy at

Buy at

United States

Amazon.com

United States

Amazon.com

United States

Amazon.com

United States

Amazon.com

United States

Amazon.com

United States

Amazon.com

United States

Amazon.com

United Kingdom

Amazon.co.uk

United Kingdom

Amazon.co.uk

United Kingdom

Amazon.co.uk

United Kingdom

Amazon.co.uk

United Kingdom

Amazon.co.uk

United Kingdom

Amazon.co.uk

United Kingdom

Amazon.co.uk

Canada

CA

Deutschland (Germany)

DE

Canada

CA

Deutschland (Germany)

DE

Canada

CA

Deutschland (Germany)

DE

Canada

CA

Deutschland (Germany)

DE

Canada

CA

Deutschland (Germany)

DE

Canada

CA

Deutschland (Germany)

DE

Canada

CA

Deutschland (Germany)

DE

La France

FR

Japan

JP

La France

FR

Japan

JP

La France

FR

Japan

JP

La France

FR

Japan

JP

La France

FR

Japan

JP

La France

FR

Japan

JP

La France

FR

Japan

JP

Amazon logo

Martin J Powell is a participant in the Amazon Europe S.à r.l. Associates Programme, an affiliate advertising programme designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.co.uk, Amazon.de and Amazon.fr

 

^ Back to Top of Page

 

 

Constellations of the Zodiac: Photographs

Photograph showing the constellations of Leo, Virgo and Coma Berenices. Click for a full-size photo (Copyright Martin J Powell, 2011)

 Photograph showing the constellation of Cancer and the Northern region of Hydra. Click for a full-size photo (Copyright Martin J Powell, 2005)

Photograph showing the constellation of Libra, the Balance and the Northern region of Scorpius, the Scorpion. Click for a full-size photo (Copyright Martin J Powell, 2006)

Chart showing the areas of the 2014-18 star chart which are covered by the photographs. Dashed lines indicate that the photograph extends beyond the boundary of the star chart

Cancer, Leo, Virgo and Libra  Photographs showing the region of the night sky through which Jupiter passes from mid-2014 to late 2018. For the Cancer photo, stars are visible down to about +8.2; for the Leo and Virgo photo, the limiting magnitude is about +7.0 and for the Libra photo it is also about +7.0. Note that the photographs do not have the same scale because of the varying camera lens settings and image resolutions (Move your pointer over the images to identify the constellations and click on the images for their full-size equivalents).

As it slowly moves along the 'celestial highway' known as the ecliptic (the apparent path along which the Sun, Moon and planets move through zodiac) Jupiter passes numerous bright stars; these are listed below, in chronological order:

2014

Jupiter in central Taurus in November 2012 (Copyright Martin J Powell 2012)

Jupiter reached opposition to the Sun in central Taurus in late 2012. This picture shows the planet in the Western sky before dawn, when it began to sink into the suburban skyglow (Move your pointer over the image to identify the constellations and click on the thumbnail for the full-size picture).

2015

2016

2017

2018

 

Deep-Sky Objects

Details of other interesting objects in the region (star clusters, variable stars, nebulae, galaxies, etc) can be found on the Zodiacal Sky: Cancer-Leo-Virgo page.

^ Back to Top of Page

Jupiter Transit Altitudes, 2015 to 2018

Jupiter is the largest of the Solar System planets and it can show considerable detail even through modest-sized telescopes. A major factor determining the likelihood of seeing a clear telescopic image is the altitude (angle above the horizon) of a planet at the time of observation. For the naked-eye observer, apart from the increased likelihood of obstruction from trees and buildings, a planet's low altitude is generally of little consequence, however for the telescopic observer high altitude is essential in order to minimise the effects of turbulence, atmospheric dimming and light pollution (skyglow) which prevails near the horizon. Consequently, telescopic observers consider high altitude transits (when a celestial body crosses the observer's meridian, reaching its highest point in the sky) as more favourable than low altitude transits. As a general rule, telescopic observation is best done when a celestial body's altitude is greater than about 30°; hence observation in the couple of hours after rising or before setting is best avoided, unless there is no other alternative.

Jupiter's meridian transit altitude (as seen from any given point on Earth) varies from one year to the next in the course of its 11.8-year journey through the zodiac constellations. Its most Northerly point is attained in Gemini (around 23½° North of the celestial equator) then - some six years later - its most Southerly point is attained in Sagittarius (around 23½° South of the celestial equator). In the intervening years, the planet lies somewhere between these two extremes.

The meridian transit altitude at which an observer sees a planet depends not only upon the constellation in which the planet is positioned at the time, but also upon the observer's latitude. As a result, certain apparitions are more favourable to observers in one hemisphere than to observers in the opposite hemisphere.

In the 2012-14 period, observers at mid-Northern latitudes saw Jupiter at its highest meridian transit altitude for some twelve years, as the planet traversed the Northernmost constellations of the zodiac. From 2015 to 2018, observers here will see Jupiter's transit altitude reduce significantly year by year as the planet heads Southward through Leo, Virgo and Libra, the planet crossing the celestial equator in September 2016.

For Southern hemisphere observers, the 2012-14 period saw Jupiter at relatively low altitudes when it reached meridian transit (due North in the Southern hemisphere) providing less-than-optimal viewing conditions for telescopic observers. From 2015, viewing circumstances from these latitudes will improve year-on-year until the planet reaches its most Southerly declination in Sagittarius in 2020.

Table listing transit altitudes of Jupiter from various latitudes from 2015 to 2018 (Copyright Martin J Powell, 2014)

Transit altitudes of Jupiter at successive oppositions from 2015 to 2018, as seen from a variety of latitudes. The Declination (Dec.) is the angle of the planet to the North (+) or South (-) of the celestial equator at the time of the planet's opposition. The Altitude Range is the approximate altitude variation over the course of the apparition, e.g. for the 2015/16 apparition at latitude 40° North, the transit altitude of Jupiter ranges from (55°.9 - 4°.1) = 51°.8 to (55°.9 + 4°.1) = 60°.0. The table demonstrates that, from 2015 through to 2018, Jovian transit altitudes improve for Southern hemisphere observers but worsen for Northern hemisphere observers.

What are the best and worst case scenarios regarding Jupiter's transiting altitude? Northern hemisphere observers witnessed their best case scenario (and Southern hemisphere observers witnessed their worst) in the 2013-14 observing season, when Jupiter was positioned at its most Northerly point in Gemini (see table on the 2011-14 page). Observers at mid-Northern latitudes then saw the planet transit at around 70° high in the sky. Mid-Southern hemisphere observers fared rather worse, the planet transiting at only 30° high (worst case scenario). The next optimal observing time for Southern hemisphere observers will be in 2020, when the planet will be transiting at altitudes of around 80° at mid-hemispheric latitudes (best case scenario). Observers at mid-Northern latitudes will then see Jupiter transiting at altitudes of less than 30° (worst case scenario).

 

^ Back to Top of Page

 

 

 

Moon near Jupiter Dates, 2014

The Moon is easy to find, and on one or two days in each month, it passes Jupiter in the sky. Use the following table to see on which dates the Moon is in the vicinity of the planet:

Date Range

(World)

Conjunction (Geocentric)

Solar Elong.

Moon Phase

Date & Time

Sep. & Dir.

2014

Jan 14/15

Jan 15, 06:08 UT

.9 N

169°W

Waning Gibbous

Feb 10/11

Feb 11, 06:17 UT

.0 N

139°E

Waxing Gibbous

Mar 9/10

Mar 10, 11:26 UT

.1 N

110°E

Waxing Gibbous

Apr 6/7

Apr 6, 22:31 UT

.4 N

85°E

First Quarter

May 4/5

May 4, 14:08 UT

.5 N

61°E

Waxing Crescent

May 31/..

Jun 1, 08:12 UT

.5 N

39°E

Waxing Crescent

.. Jun 1

Jun 28/29

Jun 29, 03:09 UT

.5 N

19°E

Waxing Crescent

Aug 23/24

Aug 23, 16:42 UT

.4 N

22°W

Waning Crescent

Sep 19/20

Sep 20, 10:43 UT

.4 N

43°W

Waning Crescent

Oct 17/18

Oct 18, 03:30 UT

5°.4 N

66°W

Waning Crescent

Nov 14/15

Nov 14, 17:45 UT

.2 N

90°W

Last Quarter

Dec 11/12

Dec 12, 03:43 UT

5°.1 N

117°W

Waning Gibbous

 

 

On December 1st, 2008, Jupiter, Venus and the four-day-old Moon formed an impressive celestial grouping in the evening sky. This is the author's simulation of how the event appeared to residents of Cairo, Egypt, at the end of evening twilight (around 1810 Local Time), when the group was situated low down in the South-western sky. Venus (at left of picture) was an 'Evening Star' at magnitude -4.0 and Jupiter was at magnitude -1.8 (closing in on the Sun, heading towards superior conjunction) at the time of the event.

On the same day, observers in Europe and North-west Africa saw the Moon pass in front of Venus (in an event called a lunar occultation) around local sunset/dusk.

Jupiter is not involved in any lunar occultations until 2016.

Moon near Jupiter dates for 2014 (no entry is given for July because in this month, Jupiter is too close to the Sun - and therefore not observable - when the Moon is nearby). The Date Range shows the range of dates worldwide (allowing for Time Zone differences across East and West hemispheres). Note that the dates, times and separations at conjunction (i.e. when the two bodies are at the same Right Ascension) are measured from the Earth's centre (geocentric) and not from the Earth's surface (times are Universal Time [UT], equivalent to GMT). The Sep. & Dir. column gives the angular distance (separation) and direction of the planet relative to the Moon, e.g. on October 18th at 03:30 UT, Jupiter is 5°.4 North of the Moon's centre. The Moon Phase shows whether the Moon is waxing (between New Moon and Full Moon), waning (between Full Moon and New Moon), at crescent phase (less than half of the lunar disk illuminated) or gibbous phase (more than half but less than fully illuminated).

The Moon moves relatively quickly against the background stars (in an Eastward direction, at about its own angular width [0º.5] each hour, or about 12º.2 per day) and because it is relatively close to the Earth, an effect called parallax causes it to appear in a slightly different position (against the background stars) when seen from any two locations on the globe at any given instant; the further apart the locations, the greater the Moon's apparent displacement against the background stars. Therefore, for any given date and time listed in the table, the Moon will appear closer to Jupiter when seen from some locations than from others. For this reason, the dates shown in the table should be used only for general guidance.

^ Back to Top of Page

 

 

 

Position of Jupiter's Four Brightest Moons

 

Jupiter's four brightest moons (satellites) - namely Ganymede (magnitude +4.6 at opposition), Io (+5.0), Europa (+5.3) and Callisto (+5.6) - can readily be seen through telescopes or steadily-held binoculars. The moons are seen to change their position in relation to each other, along the planet's equatorial plane, from one night to the next. In fact, their motion can be detected in the space of just a few hours.

Because of their low magnification, binoculars may have some difficulty detecting Io since it is the closest of the four moons to the planet; it never lies more than three Jupiter-diameters away. Europa is easier, but Ganymede is the easiest of the four to see. Callisto moves furthest away from the planet but it is also the faintest of the four.

Due to Jupiter's shallow axial tilt (3º.1 to the plane of its orbit), the Jovian moons appear to present a more-or-less linear motion when seen from the Earth (this is in contrast to, say, Saturn with its relatively high axial tilt [26º.7]), which causes its moons to mostly follow apparent elliptical paths around the planet when viewed from the Earth - see Saturn's moon positions). Approximately every six years, when the Earth passes through Jupiter's equatorial plane, the Jovian moons are seen to become involved in mutual occultations (where the moons pass in front of each other) and mutual eclipses (where a moon's shadow falls upon another moon). Numerous mutual events take place during the latter half of 2014 and the first half of 2015.

The following Flash program shows the current position of Jupiter's four brightest moons (based on your computer's clock and Time Zone settings):

The Positions of Jupiter's four brightest satellites in relation to the planet (the graphic requires the Adobe Flash Player plug-in to display correctly). Binocular and terrestrial telescope users in the Northern hemisphere should use the default 'Erect Image' (North up, East to the left) setting; Southern hemisphere observers using this equipment will need to click on the 'Inverted' (North down, West to the left) button.

Users of astronomical telescopes in the Northern hemisphere will need to use the 'Inverted' option to match the view in their telescope, whilst those in the Southern hemisphere should use the default ('Erect Image') setting. The 'Mirror Reversed' button applies to astronomical telescopes with a star diagonal attached.

Enter the required values for Date (in the form mm/dd/yyyy) and Time and click on 'Recalculate' to see the position of the moons for any date and time between January 1st 1900 AD and December 31, 2100 AD. The Timezone offset from UT is determined by the settings in your web browser.

Other details shown are the planet's apparent magnitude, its angular size (in arcseconds), its distance from the Sun (in Astronomical Units) and the planet's System II Longitude (the Jovian longitude of the central meridian, i.e. the imaginary line through the centre of the planet's disk from pole to pole). Since Jupiter's outer layers are gaseous, the planet does not rotate as a solid body; in fact the equatorial region (known as System I ) makes one rotation in 9h 50m 30s whilst the rest of the planet (System II) rotates once in 9h 55m 40s. The Great Red Spot is located in System II, at a latitude of about 22° South.

Pressing the 'Display' button generates a list of Jovian satellite phenomena for the selected date - namely transits (when a moon or its shadow passes across the planet's disk), occultations (when a moon passes behind the planet's disk) and eclipses (when a moon enters Jupiter's shadow). All of these events can be observed in telescopes.

The next three transit times of the Great Red Spot (GRS) - i.e. when it crosses the planet's central meridian - are also listed, the GRS itself being displayed on the graphic. Note that the accuracy of these times is dependant upon the Jovian longitude of the GRS, which slowly drifts over time. By default, the program uses a longitude of 98°, however this is now incorrect and the value must be updated in order to provide accurate transit times. As of mid-2014, the longitude of the GRS was approximately 210°, so this value should be entered in the 'GRS Longitude' box and the timings recalculated by pressing the 'Display' button. The current longitude of the GRS can be determined from the graph displayed at the JUPOS website.

Times of all events in the program are given in Universal Time (UT) which is equivalent to Greenwich Mean Time (GMT).

The 'Jupiter's Moons' program by John Bartucci is available as a standalone, executable (exe) file which can be downloaded from the The Wilderness Center Astronomy Club website.

^ Back to Top of Page

 

Finding Jupiter in Your Local Night Sky

Where in the night sky should I look for Jupiter tonight? In which direction and how high up will it be?

The location of a planet (or any other celestial body) in your local night sky depends upon several factors: the constellation in which it is positioned, your geographical latitude and longitude and the date and time at which you observe. To find a planet in the night sky at any particular date and time, we must know two things: a direction in which to look along the observer's horizon (eg. South-east, East-South-east) and an angle to look above the horizon (known as altitude or elevation).

From 2015 to 2017, when Jupiter is moving through Leo and Virgo, The Big Dipper (also known as The Plough) can be used to locate the planet using the method shown in the animation here. Alternatively, use the following Javascript program to help find Jupiter in your night sky throughout the year:

'Mini-AstroViewer' Java applet

For additional information on the fully-functional

version of the program, see here.

Mini-AstroViewer® is an easy-to-use Java applet which shows the positions of the celestial bodies in the night sky for any location on the globe at any time of the year (Javascript must be enabled in your browser for the program to function).

To activate the program, click on the button below (the program will open in a pop-up window).

Please enable JAVATM to use the Mini-AstroViewer night sky map.

The default location is New York, USA. To select your own location and then find Jupiter, refer to the 'Finding The Planets ..' box below.

An animated tutorial showing how to locate a planet in the night sky using Mini-AstroViewer® can be seen here.

  • The applet also shows the positions of the planets in their orbits, viewed from a point in space far above the Solar System (click on the tab marked 'Solar System' at the top of the applet; use the left-hand scroll bar to zoom out).

Finding Jupiter in Your Own Night Sky using Mini-AstroViewer®

Sun, Moon and planet colours as they appear in AstroViewer®. The program displays the Moon in its correct phase

To set your own location, click on the 'Location' button and click on your approximate position on the pop-up world map. If you know your precise latitude and longitude, you can refine your position by pressing the left/right and up/down arrows to move the cross-hair in 1° increments (to find your latitude and longitude, visit the Heavens Above website and enter the name of your nearest town or city in the search box). Having plotted your geographical co-ordinates, click 'OK' and the night sky over your own location will appear in the window, valid for the current time, which is displayed in UT (Universal Time, equivalent to GMT). The applet will initialise displaying the current UT time according to your browser's clock and Time Zone settings (if you would prefer to have the Local Time displayed, use the fully-functional version of the program at Astroviewer.com).

The red circle represents the horizon around you; the lower half of the display represents the part of the sky you are facing. The centre of the circle is the point directly above your head (known as the zenith). The ecliptic (the path along which the Sun, Moon and planets will be found) is marked by a red dashed line, passing as it does through the zodiac constellations. The blue dashed line marks the apparent position of the celestial equator, which arcs across the sky from the due East point on the horizon to the due West point. The program plots stars down to magnitude +5.0.

The bottom scroll bar rotates the horizon view, allowing for a view in any compass direction; the left-hand scroll bar zooms the sky in or out, and the right-hand scroll bar pans up (to the zenith) or down (to the horizon) whenever the view has been zoomed.

Mini-AstroViewer demonstration (click to visit AstroViewer website)

Animation showing how to locate Jupiter in the night sky using Mini-AstroViewer®. A more detailed animation showing how to use the program can be seen here.

Infomation on a celestial body can be viewed by clicking on the object (in the case of a planet, its magnitude, distance, elongation and apparent diameter). Note that if the elongation (its angular distance from the Sun as seen from the Earth) is less than about 15°, the planet will not be visible because it is too near the Sun. Remember that local twilight can affect the visibility of a particular planet, even at elongations greater than 15°, making observation difficult or even impossible. This particularly applies throughout the local summer months at higher latitudes.

To locate Jupiter, first see if it is above the horizon at the time you are requesting. If it is visible within the circle, move the bottom scroll bar left or or right to rotate the image until the planet is positioned on the vertical red line (the altitude scale). Zoom in to the area using the left-hand scroll bar where necessary (see animation opposite).

The direction of Jupiter at the requested time will be indicated at the bottom (W, SW, etc). The altitude of the planet (its angle above the horizon) can be read off on the altitude scale (it is marked at 10° intervals). Hence if it is three notches up, its altitude is 30° at the displayed time (to understand how to determine a planet's altitude in the night sky, refer to the two diagrams below). If Jupiter's altitude is less than about 10° it might be difficult to see because of the dimming effect of the Earth's atmosphere and, in town and city locations, the effects of light pollution or skyglow.

If Jupiter is not shown within the circle, it is below the horizon and you will have to wait until after it next rises before you can see it (provided it is not too near the Sun). To find when it next rises, click the 'hours forward' button (Forward in time button) repeatedly until the planet appears over the eastern horizon, then note down the time and direction this occurs. By clicking the 'minutes/hours forward' buttons (Forward in time button), Jupiter can then be tracked across the sky for the remainder of the night (using direction and altitude) as described above.

If Jupiter rises in daylight (i.e. if the Sun is already above the horizon), you will have to wait until dusk to see it - in which case, 'fast forward' to a time shortly after sunset, then note down the time and direction.

The same method can also be used to find any of the visible constellations in your night sky.

Diagram demonstrating the angular altitude of a celestial body (Copyright Martin J Powell, 2006)

 

Direction and Altitude diagram

Angular altitude (or elevation) is measured as 0º at the horizon (when an object is at the point of rising or setting), 45º when 'half way up the sky' and 90º when directly above the observer's head (at the zenith). In the picture above, the bright star has an an altitude of about 60º (i.e. it is "60º high").

Using direction and altitude to find a star or planet in the night sky - in this case, the star/planet is in the South-east (SE) at an altitude of 20º.

 

^ Back to Top of Page

 

The Current Night Sky over Guildford, England, UK  Flag of the UK

Requested by Karin Tenner

Would you like to see your own town or city shown here?

 

Requested locations may appear on another planet page (see links below) depending upon the number of requests received by the author at any given time.

A list of the night sky locations currently displayed on this website can be seen on the main Naked-eye planets page.

The graphic shows the sky at the location indicated when this page was loaded in your browser; if several minutes have since passed, click the 'Refresh' button at the top of your browser (or press the F5 key) to see the current sky.

The Night Sky location displayed here is periodically changed by the website author.

Additional AstroViewer® Information

Mini-AstroViewer® is a lightweight version of AstroViewer®, an interactive night sky map that helps you find your way in the night sky quickly and easily. Due to its intuitive interface, it is well suited to beginners in astronomy.

The fully functional, free-to-use version can be accessed at the AstroViewer® website. It has additional features such as a Local Time display, a planet visibility chart for any selected location, a 3D Solar System map, the ability to store user-generated world locations, a 'Find Celestial Body' facility, printing and language options and greater flexibility in the night sky display (see details here).

A fully-functional version for offline use can be obtained upon the purchase of a license key, following the download and installation of a test version.

AstroViewer® is produced by Dirk Matussek.

Current night sky over Guildford, Surrey

 

^ Back to Top of Page

 

The Naked-eye appearance of Jupiter

Naked Eye Planet Index

Planetary Movements through the Zodiac

 

Mercury

Venus

Mars

Jupiter

Saturn

Uranus

Neptune

Pluto

Current Position of the Sun and the Brighter Naked-Eye Planets ('Live' Star Map)


Credits


Copyright © Martin J Powell  July 2014


Site hosted by  TSOHost