© NASA/Dawn 2015

1 Ceres at solar conjunction

Dominic Ford, Editor
From the Dwarf Planets feed

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1 Ceres will pass very close to the Sun in the sky as its orbit carries it around the far side of the solar system from the Earth.

At closest approach, 1 Ceres will appear at a separation of only 0°39' from the Sun, making it totally unobservable for several weeks while it is lost in the Sun's glare.

At around the same time, 1 Ceres will also be at its most distant from the Earth – receding to a distance of 3.72 AU – since the two planets will lie on opposite sides of the solar system.

If 1 Ceres could be observed at this time, it would appear at its smallest and faintest on account of its large distance. It would measure 0.0 arcsec in diameter.

Over following weeks and months, 1 Ceres will re-emerge to the west of the Sun, gradually becoming visible for ever-longer periods in the pre-dawn sky. After around six months, it will reach opposition, when it will be visible for virtually the whole night. A chart of the path of 1 Ceres across the sky in 2017 can be found here, and a chart of its rising and setting times here.

The position of 1 Ceres at the moment it passes solar conjunction will be:

Object Right Ascension Declination Constellation Angular Size
1 Ceres 04h58m10s +22°00' Taurus 0.0"
Sun 04h57m +22°40' Taurus 31'31"

The coordinates above are given in J2000.0.

The sky on 06 June 2017
Twilight ends
Twilight begins

12-day old moon
Waxing Gibbous


12 days old

Rise Culm. Set
Mercury 04:30 11:41 18:53
Venus 03:11 09:47 16:23
Moon 17:48 23:05 03:51
Mars 06:20 13:56 21:33
Jupiter 14:50 20:40 02:34
Saturn 20:46 01:31 06:12
All times shown in EDT.


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.


The circumstances of this event were computed using the DE405 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

21 Oct 2016  –  1 Ceres at opposition
31 Jan 2018  –  1 Ceres at opposition
24 Apr 2018  –  1 Ceres at perihelion
29 May 2019  –  1 Ceres at opposition

Image credit

© NASA/Dawn 2015




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