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 7°43' to the south of Mercury. The Moon will be 1 days old.

From Ashburn, the pair will be difficult to observe as they will appear no higher than 13° above the horizon. They will become visible at around 19:34 (EDT) as the dusk sky fades, 13° above your western horizon. They will then sink towards the horizon, setting 1 hour and 31 minutes after the Sun at 20:48.

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The Moon will be at mag -8.3 in the constellation Cetus, and Mercury at mag 0.3 in the neighbouring constellation of Pisces.

The pair will be too widely separated to fit within the field of view of a telescope or pair of binoculars, but will be visible to the naked eye.

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 00h52m30s +00°52' Cetus -8.3 31'05"2
Mercury 00h52m30s +08°35' Pisces 0.3 8"1

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

The sky on 18 March 2018
Twilight ends
Twilight begins

1-day old moon
Waxing Crescent


1 day old

Rise Culm. Set
Mercury 07:46 14:17 20:48
Venus 08:00 14:19 20:37
Moon 08:11 14:17 20:23
Mars 02:45 07:26 12:07
Jupiter 23:40 04:49 09:54
Saturn 03:15 08:01 12:46
All times shown in EDT.


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 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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03 Jul 2018  –  Mercury reaches highest point in evening sky

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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