Mercury and 1 Ceres will share the same right ascension, with Mercury passing 9°56' to the south 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 no higher than 5° above the horizon at dusk.
Mercury will be at mag 0.4, and 1 Ceres at mag 8.7, both in the constellation Leo.
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 | 10h19m00s | 8°45'N | Leo | 0.4 | 8"0 |
| 1 Ceres | 10h19m00s | 18°42'N | Leo | 8.7 | 0"0 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 26° from the Sun, which is in Cancer at this time of year.
The sky on 19 Dec 2025
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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
| 09 Jan 2004 | – 1 Ceres at opposition |
| 08 May 2005 | – 1 Ceres at opposition |
| 12 Aug 2006 | – 1 Ceres at opposition |
| 09 Nov 2007 | – 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.