The Moon and Mercury will share the same right ascension, with the Moon passing 2°08' to the south of Mercury. The Moon will be 2 days old.
From Cambridge , the pair will be difficult to observe as they will appear no higher than 12° above the horizon. They will become visible at around 20:29 (EDT), 12° above your western horizon, as dusk fades to darkness. They will then sink towards the horizon, setting 1 hour and 55 minutes after the Sun at 21:52.
The Moon will be at mag -8.8, and Mercury at mag -0.0, both in the constellation Taurus.
The pair will be too widely separated to fit within the field of view of a telescope, but will be visible to the naked eye or 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 | 04h50m40s | 22°49'N | Taurus | -8.8 | 29'27"7 |
| Mercury | 04h50m40s | 24°57'N | Taurus | -0.0 | 7"4 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 21° from the Sun, which is in Aries at this time of year.
The sky on 13 May 2021
| The sky on 13 May 2021 | ||||||||||||||||||||||||||||||||||
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5% 2 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.
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| 06 Mar 2021 | – Mercury at greatest elongation west |
| 15 May 2021 | – Mercury at highest altitude in evening sky |
| 17 May 2021 | – Mercury at greatest elongation east |
| 05 Jul 2021 | – Mercury at greatest elongation west |
Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.