Conjunction between Jupiter and Mars

2015 Oct 17

Dominic Ford – originally published on

Jupiter and Mars will make a close approach, passing within 0°22' of each other.

From London (click to change), the pair will be visible in the dawn sky. They will rise at 03:40 (GMT), 3 hours and 50 minutes before the Sun, and attain an altitude of 30° above the south-eastern horizon before fading from view as dawn breaks at around 07:08.

At the moment of closest approach, Jupiter will be at mag -1.8, and Mars at mag 1.5, both in the constellation Leo.

At closest approach, the pair will be close enough to fit comfortably within the field of view of a telescope, but will also be visible to the naked eye or a through pair of binoculars.

The precise positions of Jupiter and Mars at the moment of closest approach will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
Jupiter 11h02m20s +07°11' Leo -1.8 31"4
Mars 11h03m00s +07°32' Leo 1.5 4"0

The coordinates above are given in J2000.0. The pair will be at an angular separation of 40° from the Sun, which is in Virgo at this time of year.

The details of this observing event were provided courtesy of