Conjunction between the Moon and Mars

2017 Feb 1

Dominic Ford – originally published on

The Moon and Mars will make a close approach, passing within 2°12' of each other.

From London (click to change), the pair will become visible at around 17:08 (BST) as the dusk sky fades, 34° above your south-western horizon. They will then sink towards the horizon, setting 4 hours and 46 minutes after the Sun at 21:30.

At the moment of closest approach, the Moon will be at mag -10.9, and Mars at mag 0.7, both in the constellation Pisces.

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.

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 00h13m00s -01°22' Pisces -10.9 31'42"7
Mars 00h10m20s +00°42' Pisces 0.7 5"0

The coordinates above are given in J2000.0. The pair will be at an angular separation of 50° from the Sun, which is in Capricornus at this time of year.

The details of this observing event were provided courtesy of