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public LocationGreenwich, UK
TimezoneEurope/London
Sunrise: 5:10 
Transit: 13:06 
Sunset: 21:02
sunny   (Daytime)   What's Visible Now?
Major Bodies » 

Neptune

Below the horizon.  Rise: 23:08 | Tran: 5:03 | Set: 10:55
Alt: -29.04°   Az: 48.90°   Direction: North-East

Neptune is in the constellation of Pisces, at a distance of 4,395,615,090.0 kilometers from Earth. The current Right Ascension is 00h 01m 26s and the Declination is -01° 15’ 24” (apparent coordinates). The magnitude of Neptune is 7.72 (data provided by JPL Horizons).

Finder chart of Neptune in Pisces on July,21 2024
Map showing Neptune in Pisces on July, 21 2024. Field of view: 50x30 degrees
View interactive star map

Neptune is the eighth and farthest planet from the sun, and it is the fourth-largest planet in the solar system. It has a diameter of 49,244 kilometers and a mass of 1.02 x 10^26 kilograms, making it about 17 times more massive than Earth. Neptune is an ice giant planet, primarily composed of water, methane, and ammonia, and has a deep, turbulent atmosphere with strong winds and large storms, including the famous Great Dark Spot and the smaller Dark Spot. The planet has a day length of approximately 16.1 Earth hours and an orbital period of 165 Earth years. Neptune has 14 known moons, with the largest being Triton, a captured Kuiper Belt object with a highly inclined and retrograde orbit. Neptune also has a faint and dynamic ring system, which was discovered in 1984 during a stellar occultation. The planet has been explored by only one spacecraft, NASA's Voyager 2, which flew by the planet in 1989, providing the most detailed images and data of the planet and its moons to date.

Celestial Coordinates

Apparent

00h 01m 26s
-01° 15’ 24”
14h 44m 53s
14h 46m 19s

J2000

00h 00m 10s
-01° 23’ 36”

Additional Information

Pisces
7.72

Rise and Set Times

Today's rise, transit and set times of Neptune from Greenwich, UK (all times relative to the local timezone Europe/London):

Azimuth: 91.3°
Max altitude: 37.3°
Azimuth: 268.7°
  • Neptune is below the horizon from Greenwich, UK.
  • Given its current magnitude, Neptune is visible with the help of a binocular with a 30-40mm aperture, easy with a small telescope.
  • Go to interactive sky chart

If you need to access this information frequently for your observations, you can create a simple customized Quick Access page, so that you can easily bookmark it in your browser favorites or add a shortcut to your mobile phones' home screen.

Finder Charts

Finder chart of Neptune
Sky map showing Neptune in Pisces on July, 21 2024. Field of view: 10x6 degrees. View in interactive sky chart

High precision deep sky finder chart, 60 arcmin wide, showing where Neptune is right now. Click on the image to see a more detailed fullscreen tracker view.

Neptune
RA: 00h 00m 10s
Dec: -01° 23’ 36”
Deep sky finder chart for Neptune. Field of view: 60x40 arcmins. View in deep sky object tracker

Also check out Where is Neptune?, a page that provides all the information needed to find Neptune in the sky and additional links to sky charts.

Distance from Earth

The distance of Neptune from Earth is currently 4,395,615,090.0 kilometers, equivalent to 29.3828720251 Astronomical Units. Light takes 4h 4m 22.194s to travel from Neptune and arrive to us.

4,395,615,090.0
29.3828720251
4h 4m 22.194s

The following chart shows the distance of Neptune from Earth as a function of time. In the chart the distance data is measured in Astronomical Units and sampled with an interval of 1 day.

Chart of the distance of Neptune from Earth in Astronomical Units (au)

The value of the reported distance might be somewhat inaccurate around the times of closest approach for objects passing extremely close to Earth. The value of the distance of Neptune from Earth is also available as a real time updated value in the Live Position and Data Tracker.

Closest Approach

Between 1 January 1600 and 30 December 2499, the closest approach of Neptune to Earth happens on Thu Nov 8 2373 at a distance of 28.806366 Astronomical Units, or 4,309,370,997 kilometers:

Thu Nov 8 2373
4,309,370,997
28.806366

NOTE: values for the closest approach are computed with a sampling interval of 1 day.

Light Curve

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.

Chart of the magnitude of Neptune as a function of time

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

15 Days Ephemeris

The following table lists the ephemerides of Neptune computed for the past and next 7 days, with a 24 hours interval. Apparent celestial coordinates are provided.

Date Right AscensionR.A. DeclinationDec. MagnitudeMag Apparent DiameterDiameter Constellation
2024 Jul 14 00h 01m 39s -01° 13’ 31” 7.73 2.3” Pisces
2024 Jul 15 00h 01m 38s -01° 13’ 43” 7.73 2.3” Pisces
2024 Jul 16 00h 01m 36s -01° 13’ 56” 7.73 2.3” Pisces
2024 Jul 17 00h 01m 34s -01° 14’ 09” 7.72 2.3” Pisces
2024 Jul 18 00h 01m 33s -01° 14’ 24” 7.72 2.3” Pisces
2024 Jul 19 00h 01m 31s -01° 14’ 39” 7.72 2.3” Pisces
2024 Jul 20 00h 01m 29s -01° 14’ 54” 7.72 2.3” Pisces
2024 Jul 21 00h 01m 27s -01° 15’ 11” 7.72 2.3” Pisces
2024 Jul 22 00h 01m 25s -01° 15’ 28” 7.72 2.3” Pisces
2024 Jul 23 00h 01m 22s -01° 15’ 46” 7.72 2.3” Pisces
2024 Jul 24 00h 01m 20s -01° 16’ 04” 7.72 2.3” Pisces
2024 Jul 25 00h 01m 18s -01° 16’ 23” 7.72 2.3” Pisces
2024 Jul 26 00h 01m 15s -01° 16’ 43” 7.71 2.3” Pisces
2024 Jul 27 00h 01m 12s -01° 17’ 04” 7.71 2.3” Pisces

Additional Resources