The Moon and Mars will share the same right ascension, with the Moon passing 5°43' to the north of Mars. The Moon will be 3 days old.
At around the same time, the two objects will also make a close approach, technically called an appulse.
From Cambridge , the pair will become visible at around 17:02 (EDT), 22° above your south-western horizon, as dusk fades to darkness. They will then sink towards the horizon, setting 3 hours and 22 minutes after the Sun at 19:38.
The Moon will be at mag -10.7 in the constellation Aquarius, and Mars at mag 1.1 in the neighbouring constellation of Capricornus.
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 | 21h13m40s | 11°34'S | Aquarius | -10.7 | 32'43"1 |
| Mars | 21h13m40s | 17°17'S | Capricornus | 1.1 | 4"8 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 44° from the Sun, which is in Sagittarius at this time of year.
The sky on 18 Sep 2024
| The sky on 18 September 2024 | ||||||||||||||||||||||||||||||||||
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99% 15 days old |
All times shown in EDT.
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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
| 19 May 2014 | – Mars ends retrograde motion |
| 17 Apr 2016 | – Mars enters retrograde motion |
| 22 May 2016 | – Mars at opposition |
| 30 May 2016 | – Mars at perigee |
Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.