The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.

Conjunction of the Moon and Mercury

Dominic Ford, Editor
From the Conjunctions feed

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The Moon and Mercury will share the same right ascension, with the Moon passing 2°11' to the north of Mercury. The Moon will be 1 days old.

From Cambridge, the pair will be difficult to observe as they will appear no higher than 9° above the horizon. They will become visible at around 20:40 (EDT) as the dusk sky fades, 9° above your western horizon. They will then sink towards the horizon, setting 1 hour and 15 minutes after the Sun at 21:33.

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The Moon will be at mag -9.5, and Mercury at mag 0.5, both in the constellation Leo.

The pair will be too widely separated to fit within the field of view of a telescope, but will be visible to the naked eye or through a pair of binoculars.

A graph of the angular separation between the Moon and Mercury 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
The Moon 09h21m50s +16°34' Leo -9.5 33'11"8
Mercury 09h21m50s +14°23' Leo 0.5 8"3

The coordinates above are given in J2000.0. The pair will be at an angular separation of 25° from the Sun, which is in Gemini at this time of year.

The sky on 14 July 2018
Twilight ends
Twilight begins

1-day old moon
Waxing Crescent


1 day old

Rise Culm. Set
Mercury 07:37 14:35 21:33
Venus 08:59 15:43 22:26
Moon 07:17 14:26 21:35
Mars 21:29 02:00 06:27
Jupiter 14:49 19:57 01:08
Saturn 18:56 23:31 04:10
All times shown in EDT.


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

12 Jul 2018  –  Mercury at greatest elongation east
26 Aug 2018  –  Mercury at greatest elongation west
29 Aug 2018  –  Mercury reaches highest point in morning sky
06 Nov 2018  –  Mercury at greatest elongation east

Image credit

The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.




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