The planets Jupiter and Saturn will make a close approach, passing within 1°12' of each other.
From Cambridge, the pair will be difficult to observe as they will appear no higher than 9° above the horizon. They will become visible around 18:09 (EDT) as the dusk sky fades, 9° above your western horizon. They will then sink towards the horizon, setting 1 hour and 9 minutes after the Sun at 19:02.
Jupiter will be at mag -1.7; and Saturn will be at mag 0.7. Both objects will lie in the constellation Virgo.
They 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 Jupiter and Saturn around the time of closest approach is available here.
The positions of the pair at the moment of closest approach 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 29° from the Sun, which is in Virgo at this time of year.
|The sky on 18 April 2021|
6 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.
|22 Jun 2100||– Saturn ends retrograde motion|
|22 Oct 2100||– Saturn at solar conjunction|
|16 Feb 2101||– Saturn enters retrograde motion|
|25 Apr 2101||– Saturn at opposition|
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.