Jupiter and Mars will share the same right ascension, with Jupiter passing 9'40" to the south of Mars.
At around the same time, the two objects will also make a close approach, technically called an appulse.
From South El Monte , the pair will be difficult to observe as they will appear no higher than 14° above the horizon. They will become visible at around 18:10 (PDT), 14° above your western horizon, as dusk fades to darkness. They will then sink towards the horizon, setting 1 hour and 54 minutes after the Sun at 19:26.
Jupiter will be at mag -2.1, and Mars at mag 1.2, both in the constellation Aquarius.
The pair will be close enough to fit within the field of view of a telescope, but will also be visible to the naked eye or through a pair of binoculars.
A graph of the angular separation between Jupiter and Mars 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 | 23h00m20s | 7°28'S | Aquarius | -2.1 | 32"9 |
| Mars | 23h00m20s | 7°18'S | Aquarius | 1.2 | 4"2 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 24° from the Sun, which is in Capricornus at this time of year.
The sky on 12 Sep 2025
| The sky on 12 September 2025 | ||||||||||||||||||||||||||||||||||
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64% 20 days old |
All times shown in PDT.
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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.
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Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.