Conjunction between Jupiter and Mars

2018 Jan 7

Dominic Ford – originally published on

Jupiter and Mars will make a close approach, passing within 0°12' of each other.

From London (click to change), the pair will be visible in the dawn sky. They will rise at 03:16 (BST), 4 hours and 48 minutes before the Sun, and attain an altitude of 22° above the southern horizon before fading from view as dawn breaks at around 07:37.

At the moment of closest approach, Jupiter will be at mag -1.9, and Mars at mag 1.1, both in the constellation Libra.

At closest approach, the pair will be close enough to fit comfortably within the field of view of a telescope, but will also be visible to the naked eye or a through pair of binoculars.

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

Object Right Ascension Declination Constellation Magnitude Angular Size
Jupiter 15h02m00s -16°05' Libra -1.9 32"8
Mars 15h01m50s -16°16' Libra 1.1 4"9

The coordinates above are given in J2000.0. The pair will be at an angular separation of 58° from the Sun, which is in Sagittarius at this time of year.

The details of this observing event were provided courtesy of