1 Ceres and 136199 Eris will share the same right ascension, with 1 Ceres passing 7°53' to the north of 136199 Eris.
From Fairfield , the pair will be visible in the evening sky, becoming accessible around 17:36 (EDT), 28° above your south-eastern horizon, as dusk fades to darkness. They will then reach their highest point in the sky at 20:11, 40° above your southern horizon. They will continue to be observable until around 23:32, when they sink below 21° above your south-western horizon.
1 Ceres will be at mag 8.2, and 136199 Eris at mag 18.8, both in the constellation Cetus.
A graph of the angular separation between 1 Ceres and 136199 Eris 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 |
| 1 Ceres | 01h29m20s | 0°49'S | Cetus | 8.2 | 0"0 |
| 136199 Eris | 01h29m20s | 8°43'S | Cetus | 18.8 | 0"0 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 123° from the Sun, which is in Ophiuchus at this time of year.
The sky on 9 May 2025
| The sky on 9 May 2025 | ||||||||||||||||||||||||||||||||||
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96% 12 days old |
All times shown in EDT.
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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
| 10 Oct 1993 | – 136199 Eris at opposition |
| 11 Oct 1994 | – 136199 Eris at opposition |
| 11 Oct 1995 | – 136199 Eris at opposition |
| 11 Oct 1996 | – 136199 Eris 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.