Planets TonightNeptune in 1999: brightness, position and events
Brightest+7.7around Jul 15
Closest (in table)29.116 au4356 million km
Farthest31.109 au
Events this year2
Brightest last year+7.7
Events this year
| Date (JST) | Event | Mag | Dist (au) | Constellation | Elong. |
|---|---|---|---|---|---|
| 1999-01-22 17:22 | Conjunction with the Sun | +7.9 | 31.117 | Capricornus | 0.3° |
| 1999-07-26 18:32 | Opposition | +7.7 | 29.110 | Capricornus | 179.7° |
Magnitude through the year (lower = brighter)
Twice-monthly position and visibility
| Date | Mag | Dist (au) | Constellation | Elong. | Visibility |
|---|---|---|---|---|---|
| Jan 1 | +7.9 | 31.050 | Capricornus | 21° E | Evening sky |
| Jan 15 | +7.9 | 31.109 | Capricornus | 7° E | Too close to the Sun |
| Feb 1 | +7.9 | 31.103 | Capricornus | 10° W | Too close to the Sun |
| Feb 15 | +7.9 | 31.037 | Capricornus | 23° W | Morning sky |
| Mar 1 | +7.8 | 30.918 | Capricornus | 37° W | Morning sky |
| Mar 15 | +7.8 | 30.754 | Capricornus | 50° W | Morning sky |
| Apr 1 | +7.8 | 30.508 | Capricornus | 67° W | Morning sky |
| Apr 15 | +7.8 | 30.279 | Capricornus | 80° W | Morning sky |
| May 1 | +nan | 30.008 | Capricornus | 96° W | Morning sky |
| May 15 | +7.8 | 29.776 | Capricornus | 110° W | Morning sky |
| Jun 1 | +7.8 | 29.521 | Capricornus | 126° W | Morning sky |
| Jun 15 | +7.7 | 29.347 | Capricornus | 140° W | Morning sky |
| Jul 1 | +7.7 | 29.201 | Capricornus | 155° W | Most of the night |
| Jul 15 | +7.7 | 29.128 | Capricornus | 169° W | Most of the night |
| Aug 1 | +7.7 | 29.116 | Capricornus | 174° E | Most of the night |
| Aug 15 | +7.7 | 29.168 | Capricornus | 161° E | Most of the night |
| Sep 1 | +7.7 | 29.304 | Capricornus | 144° E | Evening sky |
| Sep 15 | +7.7 | 29.469 | Capricornus | 130° E | Evening sky |
| Oct 1 | +7.8 | 29.701 | Capricornus | 114° E | Evening sky |
| Oct 15 | +7.8 | 29.930 | Capricornus | 100° E | Evening sky |
| Nov 1 | +7.8 | 30.220 | Capricornus | 83° E | Evening sky |
| Nov 15 | +7.8 | 30.453 | Capricornus | 70° E | Evening sky |
| Dec 1 | +7.8 | 30.694 | Capricornus | 54° E | Evening sky |
| Dec 15 | +7.8 | 30.869 | Capricornus | 40° 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 1999 (magnitude +7.7); 2 conjunctions, oppositions or elongations occur this year.