Planets TonightNeptune in 2018: brightness, position and events
Brightest+7.7around Aug 15
Closest (in table)28.938 au4329 million km
Farthest30.933 au
Events this year2
Brightest last year+7.7
Events this year
| Date (JST) | Event | Mag | Dist (au) | Constellation | Elong. |
|---|---|---|---|---|---|
| 2018-03-04 22:53 | Conjunction with the Sun | +7.8 | 30.935 | Aquarius | 0.9° |
| 2018-09-08 03:26 | Opposition | +7.7 | 28.933 | Aquarius | 179.0° |
Magnitude through the year (lower = brighter)
Twice-monthly position and visibility
| Date | Mag | Dist (au) | Constellation | Elong. | Visibility |
|---|---|---|---|---|---|
| Jan 1 | +7.8 | 30.405 | Aquarius | 61° E | Evening sky |
| Jan 15 | +7.8 | 30.602 | Aquarius | 47° E | Evening sky |
| Feb 1 | +7.8 | 30.788 | Aquarius | 31° E | Evening sky |
| Feb 15 | +7.8 | 30.888 | Aquarius | 17° E | Evening sky |
| Mar 1 | +7.8 | 30.933 | Aquarius | 4° E | Too close to the Sun |
| Mar 15 | +7.8 | 30.922 | Aquarius | 10° W | Too close to the Sun |
| Apr 1 | +7.8 | 30.835 | Aquarius | 26° W | Morning sky |
| Apr 15 | +7.8 | 30.708 | Aquarius | 40° W | Morning sky |
| May 1 | +7.8 | 30.511 | Aquarius | 55° W | Morning sky |
| May 15 | +7.8 | 30.305 | Aquarius | 68° W | Morning sky |
| Jun 1 | +7.8 | 30.028 | Aquarius | 84° W | Morning sky |
| Jun 15 | +7.8 | 29.792 | Aquarius | 98° W | Morning sky |
| Jul 1 | +7.7 | 29.533 | Aquarius | 113° W | Morning sky |
| Jul 15 | +7.7 | 29.329 | Aquarius | 126° W | Morning sky |
| Aug 1 | +7.7 | 29.126 | Aquarius | 143° W | Morning sky |
| Aug 15 | +7.7 | 29.009 | Aquarius | 156° W | Most of the night |
| Sep 1 | +7.7 | 28.938 | Aquarius | 173° W | Most of the night |
| Sep 15 | +7.7 | 28.943 | Aquarius | 173° E | Most of the night |
| Oct 1 | +7.7 | 29.019 | Aquarius | 156° E | Most of the night |
| Oct 15 | +7.7 | 29.144 | Aquarius | 142° E | Evening sky |
| Nov 1 | +7.7 | 29.356 | Aquarius | 125° E | Evening sky |
| Nov 15 | +7.7 | 29.570 | Aquarius | 111° E | Evening sky |
| Dec 1 | +7.8 | 29.840 | Aquarius | 95° E | Evening sky |
| Dec 15 | +7.8 | 30.082 | Aquarius | 81° 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 2018 (magnitude +7.7); 2 conjunctions, oppositions or elongations occur this year.