Mercury and Neptune will share the same right ascension, with Mercury passing 2°10' to the north of Neptune.
From Fairfield, the pair will be difficult to observe as they will appear no higher than 9° above the horizon. They will become visible around 18:06 (EDT) as the dusk sky fades, 9° above your western horizon. They will then sink towards the horizon, setting 1 hour and 15 minutes after the Sun at 19:01.
Mercury will be at mag -0.9, and Neptune at mag 8.0, both in the constellation Pisces.
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|
The coordinates above are given in J2000.0. The pair will be at an angular separation of 16° from the Sun, which is in Aquarius at this time of year.
|The sky on 03 March 2025|
3 days old
All times shown in EST.
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.
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.
|20 Sep 2024||– Neptune at opposition|
|23 Sep 2025||– Neptune at opposition|
|25 Sep 2026||– Neptune at opposition|
|28 Sep 2027||– Neptune at opposition|
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.