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 Mercury

Dominic Ford, Editor
From the Conjunctions feed

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The sky at

The Moon and Mercury will share the same right ascension, with the Moon passing 5°59' to the north of Mercury. The Moon will be 28 days old.

From Seattle however, the pair will not be observable – they will reach their highest point in the sky during daytime and will be no higher than 6° above the horizon at dawn.

Begin typing the name of a town near to you, and then select the town from the list of options which appear below.

The Moon will be at mag -8.1, and Mercury at mag 2.0, both in the constellation Leo.

A graph of the angular separation between the Moon and Mercury 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 10h36m10s 13°01'N Leo -8.1 29'25"7
Mercury 10h36m10s 7°02'N Leo 2.0 9"2

The coordinates above are given in J2000.0. The pair will be at an angular separation of 15° from the Sun, which is in Leo at this time of year.

The sky on 13 Sep 2023

The sky on 13 September 2023
Twilight ends
Twilight begins

28-day old moon
Waning Crescent


28 days old

Rise Culm. Set
Mercury 05:40 12:15 18:50
Venus 03:42 10:37 17:31
Moon 05:00 12:18 19:20
Mars 08:32 14:19 20:06
Jupiter 21:20 04:32 11:45
Saturn 18:48 23:56 05:04
All times shown in PDT.


Never attempt to point a pair of binoculars or a telescope at an object close to the Sun. Doing so may result in immediate and permanent blindness.


The circumstances of this event were computed using the DE430 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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23 Sep 2023  –  Mercury at highest altitude in morning sky
04 Dec 2023  –  Mercury at greatest elongation east

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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