Planets TonightNeptune in 1991: brightness, position and events
Brightest+7.8around Jul 1
Closest (in table)29.189 au4367 million km
Farthest31.183 au
Events this year2
Brightest last year+7.8
Events this year
| Date (JST) | Event | Mag | Dist (au) | Constellation | Elong. |
|---|---|---|---|---|---|
| 1991-01-05 12:21 | Conjunction with the Sun | +7.9 | 31.185 | Sagittarius | 0.8° |
| 1991-07-08 09:27 | Opposition | +7.8 | 29.182 | Sagittarius | 179.2° |
Magnitude through the year (lower = brighter)
Twice-monthly position and visibility
| Date | Mag | Dist (au) | Constellation | Elong. | Visibility |
|---|---|---|---|---|---|
| Jan 1 | +7.9 | 31.183 | Sagittarius | 4° E | Too close to the Sun |
| Jan 15 | +7.9 | 31.171 | Sagittarius | 10° W | Too close to the Sun |
| Feb 1 | +7.9 | 31.080 | Sagittarius | 26° W | Morning sky |
| Feb 15 | +7.9 | 30.949 | Sagittarius | 40° W | Morning sky |
| Mar 1 | +7.9 | 30.774 | Sagittarius | 54° W | Morning sky |
| Mar 15 | +7.9 | 30.566 | Sagittarius | 68° W | Morning sky |
| Apr 1 | +7.9 | 30.285 | Sagittarius | 84° W | Morning sky |
| Apr 15 | +7.8 | 30.046 | Sagittarius | 98° W | Morning sky |
| May 1 | +7.8 | 29.783 | Sagittarius | 114° W | Morning sky |
| May 15 | +7.8 | 29.577 | Sagittarius | 127° W | Morning sky |
| Jun 1 | +7.8 | 29.374 | Sagittarius | 144° W | Morning sky |
| Jun 15 | +7.8 | 29.258 | Sagittarius | 158° W | Most of the night |
| Jul 1 | +7.8 | 29.189 | Sagittarius | 173° W | Most of the night |
| Jul 15 | +7.8 | 29.189 | Sagittarius | 173° E | Most of the night |
| Aug 1 | +7.8 | 29.265 | Sagittarius | 156° E | Most of the night |
| Aug 15 | +7.8 | 29.387 | Sagittarius | 143° E | Evening sky |
| Sep 1 | +7.8 | 29.594 | Sagittarius | 126° E | Evening sky |
| Sep 15 | +7.8 | 29.802 | Sagittarius | 112° E | Evening sky |
| Oct 1 | +7.8 | 30.066 | Sagittarius | 96° E | Evening sky |
| Oct 15 | +7.8 | 30.305 | Sagittarius | 83° E | Evening sky |
| Nov 1 | +7.9 | 30.584 | Sagittarius | 66° E | Evening sky |
| Nov 15 | +7.9 | 30.789 | Sagittarius | 52° E | Evening sky |
| Dec 1 | +7.9 | 30.980 | Sagittarius | 37° E | Evening sky |
| Dec 15 | +7.9 | 31.099 | Sagittarius | 23° 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 July 1991 (magnitude +7.8); 2 conjunctions, oppositions or elongations occur this year.