Finder Chart for Neptune for 2015, with positions marked on the first day of each month (a Southern hemisphere view can be found here). Where the planet was too close to the Sun to be observable, the path is shown as a dashed line.
In 2015, Neptune reached opposition to the Sun - when it was brightest in the sky for the year and closest to the Earth - on September 1st (indicated on the chart by the symbol ) when its apparent magnitude was +7.8 and its apparent diameter was 2".4 (2.4 arcseconds). The planet was then 28.953 AU (4,331 million kms or 2,691 million miles) from Earth.
Much of the star field in the chart should be easily contained within a binocular field of view (which typically ranges from 5° to 9°). Stars are shown down to magnitude +8.5. Right Ascension and Declination co-ordinates are marked around the border, for cross-referencing with a star atlas. Printer-friendly (greyscale) versions of the chart are available for Northern and Southern hemisphere views.
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Copyright © Martin J Powell December 2015