Mars and Neptune will share the same right ascension, with Mars passing 0°34' to the south of Neptune.
From Washington, the pair will be visible in the dawn sky, rising at 03:41 (MDT) – 2 hours and 40 minutes before the Sun – and reaching an altitude of 22° above the south-eastern horizon before fading from view as dawn breaks around 05:43.
Mars will be at mag 0.8 in the constellation Aquarius, and Neptune at mag 7.9 in the neighbouring constellation of Pisces.
The pair will be a little too widely separated to fit comfortably within the field of view of a telescope, but will be visible through a pair of binoculars.
A graph of the angular separation between Mars 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 |
| Mars | 23h42m10s | -03°44' | Aquarius | 0.8 | 6"1 |
| Neptune | 23h42m10s | -03°10' | Pisces | 7.9 | 2"2 |
The coordinates above are given in J2000.0. The pair will be at an angular separation of 62° from the Sun, which is in Taurus at this time of year.
| The sky on 17 May 2022 | ||||||||||||||||||||||||||||||||||
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92% 17 days old |
All times shown in MDT.
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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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Image credit
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.