Planets TonightNeptune in 2031: brightness, position and events
Brightest+7.7around Sep 15
Closest (in table)28.854 au4317 million km
Farthest30.849 au
Events this year2
Brightest last year+7.7
Events this year
| Date (JST) | Event | Mag | Dist (au) | Constellation | Elong. |
|---|---|---|---|---|---|
| 2031-04-03 08:54 | Conjunction with the Sun | +7.8 | 30.850 | Pisces | 1.5° |
| 2031-10-08 01:21 | Opposition | +7.7 | 28.850 | Pisces | 178.4° |
Magnitude through the year (lower = brighter)
Twice-monthly position and visibility
| Date | Mag | Dist (au) | Constellation | Elong. | Visibility |
|---|---|---|---|---|---|
| Jan 1 | +7.8 | 29.833 | Cetus | 90° E | Evening sky |
| Jan 15 | +7.8 | 30.074 | Cetus | 76° E | Evening sky |
| Feb 1 | +7.8 | 30.346 | Pisces | 59° E | Evening sky |
| Feb 15 | +7.8 | 30.539 | Pisces | 45° E | Evening sky |
| Mar 1 | +7.8 | 30.691 | Pisces | 32° E | Evening sky |
| Mar 15 | +7.8 | 30.794 | Pisces | 18° E | Evening sky |
| Apr 1 | +7.8 | 30.849 | Pisces | 2° E | Too close to the Sun |
| Apr 15 | +7.8 | 30.833 | Pisces | 12° W | Too close to the Sun |
| May 1 | +7.8 | 30.748 | Pisces | 26° W | Morning sky |
| May 15 | +7.8 | 30.622 | Pisces | 40° W | Morning sky |
| Jun 1 | +7.8 | 30.413 | Pisces | 56° W | Morning sky |
| Jun 15 | +7.8 | 30.206 | Pisces | 69° W | Morning sky |
| Jul 1 | +7.8 | 29.946 | Pisces | 84° W | Morning sky |
| Jul 15 | +7.8 | 29.711 | Pisces | 97° W | Morning sky |
| Aug 1 | +7.7 | 29.436 | Pisces | 113° W | Morning sky |
| Aug 15 | +7.7 | 29.233 | Pisces | 127° W | Morning sky |
| Sep 1 | +7.7 | 29.033 | Pisces | 143° W | Morning sky |
| Sep 15 | +7.7 | 28.919 | Pisces | 157° W | Most of the night |
| Oct 1 | +7.7 | 28.854 | Pisces | 173° W | Most of the night |
| Oct 15 | +7.7 | 28.860 | Pisces | 172° E | Most of the night |
| Nov 1 | +7.7 | 28.946 | Pisces | 155° E | Most of the night |
| Nov 15 | +7.7 | 29.077 | Pisces | 141° E | Evening sky |
| Dec 1 | +7.7 | 29.282 | Pisces | 124° E | Evening sky |
| Dec 15 | +7.7 | 29.499 | Pisces | 110° E | Evening sky |
Computed with the JPL DE421 ephemeris and Skyfield (times in JST). Magnitude and distance are for 12:00 JST on each date. Visibility is a rough guide for mid-northern latitudes such as Japan.
About this page
Neptune is brightest around September 2031 (magnitude +7.7); 2 conjunctions, oppositions or elongations occur this year.