1 Ceres and 136199 Eris will share the same right ascension, with 1 Ceres passing 9°21' to the north of 136199 Eris.
From South El Monte , the pair will be visible between 23:07 and 05:15. They will become accessible at around 23:07, when they rise to an altitude of 21° above your south-eastern horizon. They will reach their highest point in the sky at 02:11, 37° above your southern horizon. They will become inaccessible at around 05:15 when they sink below 21° above your south-western horizon.
1 Ceres will be at mag 7.7, and 136199 Eris at mag 18.7, 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 | 01h12m30s | 8°36'S | Cetus | 7.7 | 0"0 |
| 136199 Eris | 01h12m30s | 17°58'S | Cetus | 18.7 | 0"0 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 158° from the Sun, which is in Virgo at this time of year.
The sky on 10 Jun 2026
| The sky on 10 June 2026 | ||||||||||||||||||||||||||||||||||
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18% 25 days old |
All times shown in PDT.
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Source
The circumstances of this event were computed using the DE440 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.
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Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.