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 1°53' to the south of Mercury. The Moon will be 1 days old.

From Seattle, the pair will be difficult to observe as they will appear no higher than 9° above the horizon. They will become visible around 20:26 (PST), 9° above your western horizon, as dusk fades to darkness. They will then sink towards the horizon, setting 1 hour and 25 minutes after the Sun at 21:31.

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 2.1, both in the constellation Aries.

The pair will be too widely separated to fit within the field of view of a telescope, but will be visible 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 02h47m50s +17°13' Aries -8.1 31'22"5
Mercury 02h47m50s +19°07' Aries 2.1 9"9

The coordinates above are given in J2000.0. The pair will be at an angular separation of 14° from the Sun, which is in Aries at this time of year.

The sky on 21 April 2023
Sunrise
06:07
Sunset
20:06
Twilight ends
22:06
Twilight begins
04:09

1-day old moon
Waxing Crescent

3%

1 day old

Planets
Rise Culm. Set
Mercury 06:25 13:58 21:31
Venus 07:48 15:50 23:53
Moon 06:47 14:29 22:28
Mars 10:05 18:10 02:14
Jupiter 06:00 12:40 19:20
Saturn 04:24 09:38 14:51
All times shown in PDT.

Warning

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.

Source

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.

Related news

11 Apr 2023  –  Mercury at greatest elongation east
29 May 2023  –  Mercury at greatest elongation west
09 Jun 2023  –  Mercury at highest altitude in morning sky
25 Jul 2023  –  Mercury at highest altitude 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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