Conjunction between the Moon and Jupiter

2018 Jan 11

Dominic Ford – originally published on

The Moon and Jupiter will make a close approach, passing within 4°09′ of each other.

From London (click to change), the pair will be visible in the dawn sky. They will rise at 03:04 (BST), 4 hours and 59 minutes before the Sun, and attain an altitude of 22° above the southern horizon before fading from view as dawn breaks at around 07:36.

At the moment of closest approach, the Moon will be at mag -11.2, and Jupiter at mag -1.9, both in the constellation Libra.

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 Jupiter at the moment of closest approach will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
The Moon 15h09m30s -12°15′ Libra -11.2 29’49″6
Jupiter 15h04m40s -16°15′ Libra -1.9 33″1

The coordinates above are given in J2000.0. The pair will be at an angular separation of 62° from the Sun, which is in Sagittarius at this time of year.

The details of this observing event were provided courtesy of