Planets TonightNeptune in 2040: brightness, position and events
Brightest+7.7around Oct 15
Closest (in table)28.821 au4312 million km
Farthest30.808 au
Events this year2
Brightest last year+7.7
Events this year
| Date (JST) | Event | Mag | Dist (au) | Constellation | Elong. |
|---|---|---|---|---|---|
| 2040-04-23 04:52 | Conjunction with the Sun | +7.8 | 30.816 | Aries | 1.7° |
| 2040-10-27 15:23 | Opposition | +7.7 | 28.816 | Aries | 178.2° |
Magnitude through the year (lower = brighter)
Twice-monthly position and visibility
| Date | Mag | Dist (au) | Constellation | Elong. | Visibility |
|---|---|---|---|---|---|
| Jan 1 | +7.7 | 29.453 | Pisces | 110° E | Evening sky |
| Jan 15 | +7.7 | 29.689 | Pisces | 96° E | Evening sky |
| Feb 1 | +7.8 | 29.982 | Pisces | 79° E | Evening sky |
| Feb 15 | +7.8 | 30.213 | Pisces | 65° E | Evening sky |
| Mar 1 | +7.8 | 30.433 | Pisces | 50° E | Evening sky |
| Mar 15 | +7.8 | 30.602 | Pisces | 37° E | Evening sky |
| Apr 1 | +7.8 | 30.745 | Aries | 21° E | Evening sky |
| Apr 15 | +7.8 | 30.805 | Aries | 7° E | Too close to the Sun |
| May 1 | +7.8 | 30.808 | Aries | 8° W | Too close to the Sun |
| May 15 | +7.8 | 30.753 | Aries | 21° W | Morning sky |
| Jun 1 | +7.8 | 30.619 | Aries | 37° W | Morning sky |
| Jun 15 | +7.8 | 30.459 | Aries | 50° W | Morning sky |
| Jul 1 | +7.8 | 30.235 | Aries | 64° W | Morning sky |
| Jul 15 | +7.8 | 30.013 | Aries | 78° W | Morning sky |
| Aug 1 | +7.8 | 29.728 | Aries | 94° W | Morning sky |
| Aug 15 | +7.7 | 29.497 | Aries | 107° W | Morning sky |
| Sep 1 | +7.7 | 29.240 | Aries | 124° W | Morning sky |
| Sep 15 | +7.7 | 29.062 | Aries | 137° W | Morning sky |
| Oct 1 | +7.7 | 28.911 | Aries | 153° W | Most of the night |
| Oct 15 | +7.7 | 28.835 | Aries | 168° W | Most of the night |
| Nov 1 | +7.7 | 28.821 | Aries | 175° E | Most of the night |
| Nov 15 | +7.7 | 28.875 | Aries | 160° E | Most of the night |
| Dec 1 | +7.7 | 29.006 | Aries | 144° E | Evening sky |
| Dec 15 | +7.7 | 29.173 | Aries | 130° 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 October 2040 (magnitude +7.7); 2 conjunctions, oppositions or elongations occur this year.