Planets TonightNeptune in 2021: brightness, position and events
Brightest+7.7around Aug 15
Closest (in table)28.917 au4326 million km
Farthest30.918 au
Events this year2
Brightest last year+7.7
Events this year
| Date (JST) | Event | Mag | Dist (au) | Constellation | Elong. |
|---|---|---|---|---|---|
| 2021-03-11 09:00 | Conjunction with the Sun | +7.8 | 30.919 | Aquarius | 1.1° |
| 2021-09-14 18:20 | Opposition | +7.7 | 28.917 | Aquarius | 178.8° |
Magnitude through the year (lower = brighter)
Twice-monthly position and visibility
| Date | Mag | Dist (au) | Constellation | Elong. | Visibility |
|---|---|---|---|---|---|
| Jan 1 | +7.8 | 30.288 | Aquarius | 68° E | Evening sky |
| Jan 15 | +7.8 | 30.500 | Aquarius | 54° E | Evening sky |
| Feb 1 | +7.8 | 30.709 | Aquarius | 37° E | Evening sky |
| Feb 15 | +7.8 | 30.832 | Aquarius | 23° E | Evening sky |
| Mar 1 | +7.8 | 30.902 | Aquarius | 10° E | Too close to the Sun |
| Mar 15 | +7.8 | 30.918 | Aquarius | 4° W | Too close to the Sun |
| Apr 1 | +7.8 | 30.861 | Aquarius | 20° W | Morning sky |
| Apr 15 | +7.8 | 30.757 | Aquarius | 34° W | Morning sky |
| May 1 | +7.8 | 30.582 | Aquarius | 49° W | Morning sky |
| May 15 | +7.8 | 30.389 | Aquarius | 62° W | Morning sky |
| Jun 1 | +7.8 | 30.122 | Aquarius | 78° W | Morning sky |
| Jun 15 | +7.8 | 29.888 | Aquarius | 91° W | Morning sky |
| Jul 1 | +7.7 | 29.622 | Aquarius | 106° W | Morning sky |
| Jul 15 | +7.7 | 29.406 | Aquarius | 120° W | Morning sky |
| Aug 1 | +7.7 | 29.182 | Aquarius | 136° W | Morning sky |
| Aug 15 | +7.7 | 29.042 | Aquarius | 150° W | Morning sky |
| Sep 1 | +7.7 | 28.939 | Aquarius | 167° W | Most of the night |
| Sep 15 | +7.7 | 28.917 | Aquarius | 179° E | Most of the night |
| Oct 1 | +7.7 | 28.963 | Aquarius | 163° E | Most of the night |
| Oct 15 | +7.7 | 29.063 | Aquarius | 149° E | Evening sky |
| Nov 1 | +7.7 | 29.252 | Aquarius | 132° E | Evening sky |
| Nov 15 | +7.7 | 29.452 | Aquarius | 118° E | Evening sky |
| Dec 1 | +7.7 | 29.713 | Aquarius | 101° E | Evening sky |
| Dec 15 | +7.8 | 29.954 | Aquarius | 87° 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 August 2021 (magnitude +7.7); 2 conjunctions, oppositions or elongations occur this year.