The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.

Conjunction of the Moon and Saturn

Thu, 03 Aug 2017 at03:10 EDT(230 days ago)
07:10 UTC

Dominic Ford, Editor
From the Conjunctions feed

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The sky at

The Moon and Saturn will share the same right ascension, with the Moon passing 3°27' to the north of Saturn. The Moon will be 11 days old.

At around the same time, the two objects will also make a close approach, technically called an appulse.

From Ashburn (click to change), the pair will be visible in the evening sky, becoming accessible at around 20:35 (EDT) as the dusk sky fades, 26° above your southern horizon. They will then reach its highest point in the sky at 21:41, 29° above your southern horizon. They will continue to be observable until around 01:40, when they sink to 7° above your south-western horizon.

The Moon will be at mag -12.3, and Saturn at mag 0.1, both in the constellation Ophiuchus.

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.

A graph of the angular separation between the Moon and Saturn around the time of closest approach is available here.

The positions of the two objects at the moment of conjunction will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
The Moon 17h22m30s -18°27' Ophiuchus -12.3 29'29"9
Saturn 17h22m30s -21°54' Ophiuchus 0.1 17"7

The coordinates above are given in J2000.0. The pair will be at an angular separation of 130° from the Sun, which is in Cancer at this time of year.

The sky on 03 August 2017
Twilight ends
Twilight begins

11-day old moon
Waxing Gibbous


11 days old

Rise Culm. Set
Mercury 08:30 14:54 21:19
Venus 03:14 10:34 17:54
Moon 17:23 22:20 02:35
Mars 05:58 13:06 20:15
Jupiter 11:39 17:24 23:08
Saturn 16:53 21:41 02:32
All times shown in EDT.


The circumstances of this event were computed using the DE405 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).

This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.

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20 Jul 2020, 18:15 EDT  –  Saturn at opposition

Image credit

The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.




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