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 2°08' to the south of Mercury. The Moon will be 2 days old.

From Ashburn, the pair will become visible around 20:32 (EST), 15° above your western horizon, as dusk fades to darkness. They will then sink towards the horizon, setting 1 hour and 52 minutes after the Sun at 22:06.

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 -8.8, and Mercury at mag -0.0, both in the constellation Taurus.

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 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 04h50m40s +22°49' Taurus -8.8 29'27"7
Mercury 04h50m40s +24°57' Taurus -0.0 7"4

The coordinates above are given in J2000.0. The pair will be at an angular separation of 21° from the Sun, which is in Aries at this time of year.

The sky on 13 May 2021
Twilight ends
Twilight begins

2-day old moon
Waxing Crescent


2 days old

Rise Culm. Set
Mercury 07:01 14:33 22:05
Venus 06:39 13:56 21:13
Moon 07:03 14:34 22:13
Mars 09:05 16:35 00:04
Jupiter 02:30 07:52 13:14
Saturn 01:43 06:47 11:51
All times shown in EDT.


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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06 Mar 2021  –  Mercury at greatest elongation west
17 May 2021  –  Mercury at highest altitude in evening sky
17 May 2021  –  Mercury at greatest elongation east
05 Jul 2021  –  Mercury at greatest elongation west

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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