1 Ceres's 4.6-year orbit around the Sun will carry it to its closest point to the Sun – its perihelion – at a distance of 2.55 AU.
In practice, however, 1 Ceres's orbit is very close to circular; its distance from the Sun only varies by about 17.2% between perihelion and aphelion. This means that the difference in the amount of heat and light it receives from the Sun between aphelion and perihelion is extremely small.
Finding 1 Ceres
1 Ceres's distance from the Sun doesn't affect its appearance. From Cambridge, at the moment of perihelion it will become visible at around 20:57 (EST), 64° above your south-western horizon, as dusk fades to darkness. It will then sink towards the horizon, setting at 03:13.
A chart of the path of 1 Ceres across the sky in 2018 can be found here, and a chart of its rising and setting times here.
The position of 1 Ceres at the moment it passes perihelion will be:
| Object | Right Ascension | Declination | Constellation | Magnitude | Angular Size |
| 1 Ceres | 09h01m40s | 28°26'N | Cancer | 8.3 | 0.0" |
The coordinates above are given in J2000.0.
The sky on 30 Apr 2018
| The sky on 30 April 2018 | ||||||||||||||||||||||||||||||||||
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98% 14 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
| 30 Jan 2018 | – 1 Ceres at opposition |
| 28 May 2019 | – 1 Ceres at opposition |
| 28 Aug 2020 | – 1 Ceres at opposition |
| 26 Nov 2021 | – 1 Ceres at opposition |
Image credit
© NASA/Dawn 2015