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Conjunction of the Moon and Mars

Dominic Ford, Editor
From the Conjunctions feed

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The sky at

The Moon and Mars will share the same right ascension, with the Moon passing 5°46' to the south of Mars. The Moon will be 2 days old.

From Fairfield, the pair will become visible around 20:02 (EST) as the dusk sky fades, 20° above your western horizon. They will then sink towards the horizon, setting 2 hours and 17 minutes after the Sun at 22:00.

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 -9.5, and Mars at mag 1.6, both in the constellation Taurus.

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 Mars 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 04h09m40s +15°53' Taurus -9.5 33'12"3
Mars 04h09m40s +21°39' Taurus 1.6 3"9

The coordinates above are given in J2000.0. The pair will be at an angular separation of 25° from the Sun, which is in Aries at this time of year.

The sky on 28 April 2017
Twilight ends
Twilight begins

2-day old moon
Waxing Crescent


2 days old

Rise Culm. Set
Mercury 05:25 12:00 18:35
Venus 04:15 10:23 16:31
Moon 08:00 15:05 22:10
Mars 07:12 14:37 22:02
Jupiter 17:37 23:24 05:15
Saturn 23:31 04:15 08:56
All times shown in EDT.


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.

Related news

29 Oct 2016  –  Mars at perihelion
26 Jul 2017  –  Mars at solar conjunction
05 Aug 2017  –  Mars at apogee
07 Oct 2017  –  Mars at aphelion

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