Jupiter and Neptune will share the same right ascension, with Jupiter passing 43' to the south of Neptune.
From South El Monte , the pair will be visible between 22:05 and 04:03. They will become accessible at around 22:05, when they rise to an altitude of 21° above your south-eastern horizon. They will reach their highest point in the sky at 01:04, 37° above your southern horizon. They will become inaccessible at around 04:03 when they sink below 21° above your south-western horizon.
Jupiter will be at mag -2.5, and Neptune at mag 7.9, both in the constellation Libra.
The pair will be a little too widely separated to fit comfortably within the field of view of a telescope, but will be visible through a pair of binoculars.
A graph of the angular separation between Jupiter and Neptune around the time of closest approach is available here.
The positions of the two objects at the moment of conjunction will be as follows:
| Object | Right Ascension | Declination | Constellation | Magnitude | Angular Size |
| Jupiter | 16h01m40s | 19°38'S | Libra | -2.5 | 44"2 |
| Neptune | 16h01m40s | 18°54'S | Libra | 7.9 | 2"3 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 177° from the Sun, which is in Taurus at this time of year.
The sky on 13 Dec 2025
| The sky on 13 December 2025 | ||||||||||||||||||||||||||||||||||
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27% 23 days old |
All times shown in PST.
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Source
The circumstances of this event were computed using the DE430 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).
This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.
Related news
| 05 Mar 1971 | – Neptune enters retrograde motion |
| 23 May 1971 | – Neptune at opposition |
| 12 Aug 1971 | – Neptune ends retrograde motion |
| 06 Mar 1972 | – Neptune enters retrograde motion |
Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.