Conjunction between the Moon and Jupiter

2017 Jul 28

Dominic Ford – originally published on In-The-Sky.org

The Moon and Jupiter will make a close approach, passing within 2°57' of each other.

From London (click to change), the pair will be difficult to observe as they will appear no higher than 16° above the horizon. They will become visible at around 21:20 (BST) as the dusk sky fades, 16° above your south-western horizon. They will then sink towards the horizon, setting 2 hours and 20 minutes after the Sun at 23:13.

At the moment of closest approach, the Moon will be at mag -11.4, and Jupiter at mag -1.9, both in the constellation Virgo.

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 13h06m00s -02°31' Virgo -11.4 30'29"8
Jupiter 13h02m00s -05°19' Virgo -1.9 33"8

The coordinates above are given in J2000.0. The pair will be at an angular separation of 70° from the Sun, which is in Cancer at this time of year.


The details of this observing event were provided courtesy of In-The-Sky.org

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