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BAA Observing calendar

Conjunction between the Moon and Mars

Friday, 2018, November 16 - 04:53

Dominic Ford – originally published on

The Moon and Mars will make a close approach, passing within 0°57' of each other.

From London (click to change), the pair will be visible in the evening sky. They will become visible at around 16:31 (BST) as the dusk sky fades, 20° above your south-eastern horizon. They will then reach its highest point in the sky at 18:27, 25° above your southern horizon. They will continue to be observable until around 22:22, when they sink to 8° above your south-western horizon.

At the moment of closest approach, the Moon will be at mag -11.9, and Mars at mag -0.8, both in the constellation Aquarius.

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

The precise positions of the Moon and Mars at the moment of closest approach will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
The Moon 22h11m30s -13°59' Aquarius -11.9 29'39"0
Mars 22h10m20s -13°04' Aquarius -0.8 10"4

The coordinates above are given in J2000.0. The pair will be at an angular separation of 96° from the Sun, which is in Libra at this time of year.

The details of this observing event were provided courtesy of