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Neptune

Available Resources

Neptune Sky Charts and Coordinates

This is a simplified sky chart, showing where Neptune is now with respect to the brightest stars and constellations.

More advanced sky charts are available on TheSkyLive for this object: 1) the Online Planetarium which is interactive and allows to select dates and additional objects to visualize; and 2) the Live Position and Data Tracker which provides the highest precision position data and features deep sky imagery from the Digitized Sky Survey.

Neptune in Aquarius on September, 21 2017
22h 55m 41s
-07° 51’ 47”
7.82
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]

Neptune Rise and Set Times

Today's Neptune rise, transit and set times from Greenwich, United Kingdom [change]. All times are relative to the local timezone Europe/London.

Azimuth: 97.9°
Max altitude: 30.7°
Azimuth: 262.1°

Neptune Ephemeris

The following table lists the ephemerides of Neptune computed for the past and next 7 days, with a 24 hours interval. Click on each row of the table to locate Neptune in our Online Planetarium at the chosen date.

Date MagnitudeMag Right AscensionR.A. DeclinationDec. Constellation
2017 Sep 14 7.82 22h 56m 22s -07° 47’ 29” Aquarius
2017 Sep 15 7.82 22h 56m 17s -07° 48’ 06” Aquarius
2017 Sep 16 7.82 22h 56m 11s -07° 48’ 42” Aquarius
2017 Sep 17 7.82 22h 56m 04s -07° 49’ 20” Aquarius
2017 Sep 18 7.82 22h 55m 59s -07° 49’ 58” Aquarius
2017 Sep 19 7.82 22h 55m 53s -07° 50’ 34” Aquarius
2017 Sep 20 7.82 22h 55m 46s -07° 51’ 11” Aquarius
2017 Sep 21 7.82 22h 55m 41s -07° 51’ 47” Aquarius
2017 Sep 22 7.82 22h 55m 35s -07° 52’ 23” Aquarius
2017 Sep 23 7.82 22h 55m 30s -07° 52’ 59” Aquarius
2017 Sep 24 7.82 22h 55m 23s -07° 53’ 34” Aquarius
2017 Sep 25 7.82 22h 55m 18s -07° 54’ 08” Aquarius
2017 Sep 26 7.82 22h 55m 12s -07° 54’ 43” Aquarius
2017 Sep 27 7.82 22h 55m 06s -07° 55’ 18” Aquarius

Distance of Neptune from Earth

The following chart shows the distance of Neptune from Earth as a function of time. Distance data is measured in Astronomical Units and sampled with a 2 days interval.

The reported distances might be inaccurate around the times of closest approach for objects passing extremely close to Earth.

Distance of Neptune from Earth between January 2013 and December 2075

Light Curve of Neptune

The following chart is the predicted light curve (visual magnitude as a function of time) of Neptune, according to the most recent ephemerides data. Magnitude data is sampled with a 2 days interval and there might be inaccuracies for objects changing brightness very rapidly during the course of a few days. For comets there could be large discrepancies between the observed and predicted brightness because of their highly dynamic behaviour.

Predicted magnitude of Neptune between January 2013 and December 2075

Neptune Physical Data

The following shows the known values of the most important physical parameters of Neptune. Source: JPL Small-Body Database

Physical Parameter Value Relative to Earth
Diameter 49244 km 3.8647
Mass 102.41 x 1024 kg 17.1478
Density 1.638 gr/cm3 0.2971
Escape Velocity 23.56 km/s 2.1055
Sideral Rotation 16.1100 hours 0.6731
Absolute Magnitude -6.87
Geometric Albedo 0.41