The planets Jupiter and Neptune will make a close approach, passing within a mere 23.4 arcminutes of each other.
From South El Monte , the pair will be visible in the dawn sky, rising at 00:59 (PDT) and reaching an altitude of 35° above the south-eastern horizon before fading from view as dawn breaks at around 04:32.
Jupiter will be at mag -2.4; and Neptune will be at mag 7.9. Both objects will lie in the constellation Capricornus.
They will be close enough to fit within the field of view of a telescope, but will also be visible through a pair of binoculars.
At around the same time, the pair will also share the same right ascension – called a conjunction.
A graph of the angular separation between Jupiter and Neptune around the time of closest approach is available here.
The positions of the pair at the moment of closest approach will be as follows:
| Object | Right Ascension | Declination | Constellation | Magnitude | Angular Size |
| Jupiter | 21h55m10s | 13°28'S | Capricornus | -2.4 | 40"2 |
| Neptune | 21h54m50s | 13°06'S | Capricornus | 7.9 | 2"2 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 99° from the Sun, which is in Taurus at this time of year.
The sky on 12 Sep 2025
| The sky on 12 September 2025 | ||||||||||||||||||||||||||||||||||
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66% 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.
Related news
| 02 Nov 2008 | – Neptune ends retrograde motion |
| 28 May 2009 | – Neptune enters retrograde motion |
| 17 Aug 2009 | – Neptune at opposition |
| 04 Nov 2009 | – Neptune ends 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.