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 Mars

Dominic Ford, Editor
From the Conjunctions feed

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The Moon and Mars will share the same right ascension, with the Moon passing 6°43' to the north of Mars. The Moon will be 14 days old.

From Ashburn, the pair will be visible between 21:41 and 04:57. They will become accessible around 21:41, when they rise to an altitude of 7° above your south-eastern horizon. They will reach its highest point in the sky at 01:21, 25° above your southern horizon. They will become inaccessible around 04:57 when they sink below 8° above your south-western horizon.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

The Moon will be at mag -12.5, and Mars at mag -2.8, both in the constellation Capricornus.

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

A graph of the angular separation between the Moon and Mars 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 20h30m40s -18°54' Capricornus -12.5 29'24"7
Mars 20h30m40s -25°37' Capricornus -2.8 24"2

The coordinates above are given in J2000.0. The pair will be at an angular separation of 179° from the Sun, which is in Cancer at this time of year.

The sky on 27 July 2018
Twilight ends
Twilight begins

14-day old moon
Waning Gibbous


14 days old

Rise Culm. Set
Mercury 07:48 14:25 21:01
Venus 09:50 16:08 22:27
Moon 20:32 00:45 05:39
Mars 20:45 01:22 05:54
Jupiter 14:20 19:33 00:49
Saturn 18:17 23:02 03:50
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

27 Jul 2018  –  Mars at opposition
13 Oct 2020  –  Mars at opposition
08 Dec 2022  –  Mars at opposition
15 Jan 2025  –  Mars at opposition

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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