Mercury and 1 Ceres will share the same right ascension, with Mercury passing 4°11' to the north of 1 Ceres.
From South El Monte however, the pair will not be observable – they will reach their highest point in the sky during daytime and will be 5° below the horizon at dawn.
Mercury will be at mag -0.2 in the constellation Aries, and 1 Ceres at mag 9.1 in the neighbouring constellation of Cetus.
The pair will be too widely separated to fit within the field of view of a telescope, but will be visible through a pair of binoculars.
A graph of the angular separation between Mercury and 1 Ceres 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 |
| Mercury | 02h14m50s | 10°42'N | Aries | -0.2 | 6"3 |
| 1 Ceres | 02h14m50s | 6°31'N | Cetus | 9.1 | 0"0 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 22° from the Sun, which is in Taurus at this time of year.
The sky on 17 Sep 2025
| The sky on 17 September 2025 | ||||||||||||||||||||||||||||||||||
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9% 25 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
| 28 Aug 1997 | – 1 Ceres at opposition |
| 27 Nov 1998 | – 1 Ceres at opposition |
| 20 Mar 2000 | – 1 Ceres at opposition |
| 06 Jul 2001 | – 1 Ceres at opposition |
Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.