Planets TonightNeptune in 2039: brightness, position and events
Brightest+7.7around Oct 15
Closest (in table)28.827 au4313 million km
Farthest30.812 au
Events this year2
Brightest last year+7.7
Events this year
| Date (JST) | Event | Mag | Dist (au) | Constellation | Elong. |
|---|---|---|---|---|---|
| 2039-04-21 15:52 | Conjunction with the Sun | +7.8 | 30.819 | Pisces | 1.7° |
| 2039-10-26 03:23 | Opposition | +7.7 | 28.819 | Pisces | 178.2° |
Magnitude through the year (lower = brighter)
Twice-monthly position and visibility
| Date | Mag | Dist (au) | Constellation | Elong. | Visibility |
|---|---|---|---|---|---|
| Jan 1 | +7.7 | 29.497 | Pisces | 108° E | Evening sky |
| Jan 15 | +7.7 | 29.735 | Pisces | 94° E | Evening sky |
| Feb 1 | +7.8 | 30.028 | Pisces | 77° E | Evening sky |
| Feb 15 | +7.8 | 30.256 | Pisces | 63° E | Evening sky |
| Mar 1 | +7.8 | 30.457 | Pisces | 49° E | Evening sky |
| Mar 15 | +7.8 | 30.621 | Pisces | 35° E | Evening sky |
| Apr 1 | +7.8 | 30.757 | Pisces | 19° E | Evening sky |
| Apr 15 | +7.8 | 30.812 | Pisces | 6° E | Too close to the Sun |
| May 1 | +7.8 | 30.808 | Pisces | 9° W | Too close to the Sun |
| May 15 | +7.8 | 30.747 | Pisces | 22° W | Morning sky |
| Jun 1 | +7.8 | 30.606 | Aries | 38° W | Morning sky |
| Jun 15 | +7.8 | 30.443 | Aries | 51° W | Morning sky |
| Jul 1 | +7.8 | 30.214 | Aries | 66° W | Morning sky |
| Jul 15 | +7.8 | 29.990 | Aries | 79° W | Morning sky |
| Aug 1 | +7.8 | 29.705 | Aries | 95° W | Morning sky |
| Aug 15 | +7.7 | 29.475 | Aries | 109° W | Morning sky |
| Sep 1 | +7.7 | 29.221 | Aries | 125° W | Morning sky |
| Sep 15 | +7.7 | 29.048 | Aries | 139° W | Morning sky |
| Oct 1 | +7.7 | 28.903 | Aries | 155° W | Most of the night |
| Oct 15 | +7.7 | 28.833 | Pisces | 169° W | Most of the night |
| Nov 1 | +7.7 | 28.827 | Pisces | 173° E | Most of the night |
| Nov 15 | +7.7 | 28.887 | Pisces | 159° E | Most of the night |
| Dec 1 | +7.7 | 29.024 | Pisces | 142° E | Evening sky |
| Dec 15 | +7.7 | 29.196 | Pisces | 128° 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 2039 (magnitude +7.7); 2 conjunctions, oppositions or elongations occur this year.