Mercury and Mars will share the same right ascension, with Mercury passing 0°14' to the north of Mars.
From Cambridge, the pair will be difficult to observe as they will appear no higher than 10° above the horizon. They will become visible around 20:59 (EDT) as the dusk sky fades, 10° above your western horizon. They will then sink towards the horizon, setting 1 hour and 44 minutes after the Sun at 22:05.
Mercury will be at mag 0.1, and Mars at mag 1.8, both in the constellation Gemini.
The pair will be close enough to fit within the field of view of a telescope, but will also be visible to the naked eye or through a pair of binoculars.
A graph of the angular separation between Mercury 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 coordinates above are given in J2000.0. The pair will be at an angular separation of 24° from the Sun, which is in Taurus at this time of year.
|The sky on 18 June 2019|
15 days old
All times shown in EDT.
The circumstances of this event were computed using the DE405 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.
|16 Sep 2018||– Mars at perihelion|
|25 Aug 2019||– Mars at aphelion|
|28 Aug 2019||– Mars at apogee|
|02 Sep 2019||– Mars at solar conjunction|