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BAA Observing calendar

Conjunction between the Moon and Jupiter

Sunday, 2018, May 27 - 20:54

Dominic Ford – originally published on

The Moon and Jupiter will make a close approach, passing within 3°46' of each other.

From London (click to change), the pair will be visible in the evening sky. They will become visible at around 21:28 (BST) as the dusk sky fades, 17° above your south-eastern horizon. They will then reach its highest point in the sky at 23:33, 23° above your southern horizon. They will continue to be observable until around 03:16, when they sink to 8° above your south-western horizon.

At the moment of closest approach, the Moon will be at mag -12.5, and Jupiter at mag -2.5, 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 14h59m20s -11°46' Libra -12.5 30'21"0
Jupiter 14h54m40s -15°23' Libra -2.5 43"3

The coordinates above are given in J2000.0. The pair will be at an angular separation of 159° from the Sun, which is in Taurus at this time of year.

The details of this observing event were provided courtesy of