Mercury and 1 Ceres will share the same right ascension, with Mercury passing 6°18' to the north of 1 Ceres.
From South El Monte however, the pair will not be readily observable since they will be very close to the Sun, at a separation of only 16° from it.
Mercury will be at mag 1.4, and 1 Ceres at mag 9.0, both in the constellation Sagittarius.
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 | 19h15m30s | 18°56'S | Sagittarius | 1.4 | 9"4 |
| 1 Ceres | 19h15m30s | 25°15'S | Sagittarius | 9.0 | 0"0 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 15° from the Sun, which is in Capricornus at this time of year.
The sky on 20 Dec 2025
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All times shown in PST.
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Warning
Never attempt to point a pair of binoculars or a telescope at an object close to the Sun. Doing so may result in immediate and permanent blindness.
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
| 08 May 1982 | – 1 Ceres at opposition |
| 12 Aug 1983 | – 1 Ceres at opposition |
| 08 Nov 1984 | – 1 Ceres at opposition |
| 25 Feb 1986 | – 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.