Mercury at superior solar conjunction

Thu, 27 Oct 2016 at12:00 EDT(512 days ago)
16:00 UTC

Dominic Ford, Editor
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The sky at

Mercury 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.

This occurs once in every synodic cycle of the planet (116 days), and marks the end of Mercury's apparition in the morning sky and its transition to become an evening object over the next few weeks.

At closest approach, Mercury will appear at a separation of only 0°30' from the Sun, making it totally unobservable for several weeks while it is lost in the Sun's glare.

Mercury will also pass apogee – the time when it is most distant from the Earth – at around the same time, since it will lie exactly opposite to the Earth in the Solar System. It will move to a distance of 1.43 AU from the Earth, making it appear small and very distant. If it could be observed, it would measure 4.7 arcsec in diameter, whilst appearing completely illuminated.

The exact position of Mercury at the moment it passes solar conjunction will be:

Object Right Ascension Declination Constellation Angular Size
Mercury 14h09m20s -12°30' Virgo 4.7"
Sun 14h08m -12°59' Virgo 32'11"

The coordinates above are given in J2000.0.

The sky on 27 October 2016
Twilight ends
Twilight begins

26-day old moon
Waning Crescent


26 days old

Rise Culm. Set
Mercury 07:31 12:53 18:15
Venus 10:41 15:21 20:01
Moon 04:38 10:47 16:56
Mars 13:35 18:14 22:54
Jupiter 05:29 11:23 17:16
Saturn 10:43 15:33 20:24
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

28 Sep 2016, 13:07 EDT  –  Mercury at greatest elongation west
11 Dec 2016, 02:45 EST  –  Mercury at greatest elongation east
19 Jan 2017, 08:45 EST  –  Mercury at greatest elongation west
01 Apr 2017, 01:52 EDT  –  Mercury at greatest elongation east

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