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

Conjunction of Mercury and Neptune

Dominic Ford, Editor
From the Conjunctions feed

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The sky at

Mercury and Neptune will share the same right ascension, with Mercury passing 1°23' to the south of Neptune.

From Fairfield however, the pair will not be observable – they will reach their highest point in the sky during daytime and will be no higher than 1° 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.

Mercury will be at mag -0.4, and Neptune at mag 8.0, both in the constellation Aquarius.

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 Mercury and Neptune 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
Mercury 23h28m40s -05°56' Aquarius -0.4 5"4
Neptune 23h28m40s -04°32' Aquarius 8.0 2"2

The coordinates above are given in J2000.0. The pair will be at an angular separation of 18° from the Sun, which is in Pisces at this time of year.

The sky on 29 March 2021
Sunrise
06:41
Sunset
19:17
Twilight ends
20:49
Twilight begins
05:05

16-day old moon
Waning Gibbous

98%

16 days old

Planets
Rise Culm. Set
Mercury 06:11 11:51 17:32
Venus 06:49 13:01 19:12
Moon 20:33 01:28 07:27
Mars 09:42 17:17 00:52
Jupiter 04:55 10:05 15:16
Saturn 04:24 09:21 14:19
All times shown in EDT.

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

10 Mar 2021  –  Neptune at solar conjunction
25 Jun 2021  –  Neptune enters retrograde motion
14 Sep 2021  –  Neptune at opposition
01 Dec 2021  –  Neptune ends retrograde motion

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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41.14°N
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