Mercury and Neptune will share the same right ascension, with Mercury passing 0°23' to the north of Neptune.
Mercury will be at mag 0.7, and Neptune at mag 8.0, both in the constellation Aquarius.
The pair will be close enough to fit within the field of view of a telescope, but will also 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 25° from the Sun, which is in Pisces at this time of year.
|The sky on 02 April 2019|
27 days old
All times shown in EDT.
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.
|07 Sep 2018||– Neptune at opposition|
|10 Sep 2019||– Neptune at opposition|
|11 Sep 2020||– Neptune at opposition|
|14 Sep 2021||– Neptune at opposition|
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.