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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 December, 15 2018
High Precision Live Sky Chart
 = visible to the naked eye
 = binocular, brighter than 10th magnitude
= current altitude ≥ 30°   = current altitude < 30°   = below the horizon
Location: Greenwich, United Kingdom [change]
23h 00m 52s
-07° 22’ 06”
2.3”
7.90

Neptune Rise and Set Times

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

Azimuth: 97.4°
Max altitude: 31.2°
Azimuth: 262.6°

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 Right AscensionR.A. DeclinationDec. MagnitudeMag Apparent DiameterDiameter Constellation
2018 Dec 08 23h 00m 37s -07° 23’ 49” 7.89 2.3” Aquarius
2018 Dec 09 23h 00m 38s -07° 23’ 38” 7.90 2.3” Aquarius
2018 Dec 10 23h 00m 41s -07° 23’ 25” 7.90 2.3” Aquarius
2018 Dec 11 23h 00m 42s -07° 23’ 12” 7.90 2.3” Aquarius
2018 Dec 12 23h 00m 44s -07° 22’ 57” 7.90 2.3” Aquarius
2018 Dec 13 23h 00m 47s -07° 22’ 41” 7.90 2.3” Aquarius
2018 Dec 14 23h 00m 50s -07° 22’ 26” 7.90 2.3” Aquarius
2018 Dec 15 23h 00m 51s -07° 22’ 09” 7.90 2.3” Aquarius
2018 Dec 16 23h 00m 55s -07° 21’ 51” 7.90 2.3” Aquarius
2018 Dec 17 23h 00m 56s -07° 21’ 33” 7.90 2.3” Aquarius
2018 Dec 18 23h 01m 00s -07° 21’ 14” 7.91 2.3” Aquarius
2018 Dec 19 23h 01m 02s -07° 20’ 53” 7.91 2.3” Aquarius
2018 Dec 20 23h 01m 05s -07° 20’ 33” 7.91 2.3” Aquarius
2018 Dec 21 23h 01m 09s -07° 20’ 12” 7.91 2.2” 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. The value of the distance of Neptune is also available as a real time updated value in the Live Position and Data Tracker.

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