British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Observing calendar

Conjunction between the Moon and Saturn

Wednesday, 2018, July 25 - 07:05

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

The Moon and Saturn will make a close approach, passing within 1°59' of each other.

From London (click to change), the pair will be difficult to observe as they will appear no higher than 15° above the horizon. They will be visible in the evening sky. They will become visible at around 21:23 (BST) as the dusk sky fades, 12° above your south-eastern horizon. They will then reach its highest point in the sky at 23:02, 15° above your southern horizon. They will continue to be observable until around 01:46, when they sink to 8° above your south-western horizon.

At the moment of closest approach, the Moon will be at mag -12.4, and Saturn at mag 0.9, both in the constellation Sagittarius.

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

Object Right Ascension Declination Constellation Magnitude Angular Size
The Moon 18h16m20s -20°35' Sagittarius -12.4 29'30"0
Saturn 18h15m50s -22°34' Sagittarius 0.9 18"1

The coordinates above are given in J2000.0. The pair will be at an angular separation of 151° 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

.