Dominic Ford, Editor
From the Appulses feed
The Moon and Mars will make a close approach, passing within 4°41' of each other. The Moon will be 18 days old.
From Seattle, the pair will be difficult to observe as they will appear no higher than 19° above the horizon. They will be visible in the morning sky, becoming accessible around 00:19, when they rise to an altitude of 7° above your south-eastern horizon. They will then reach its highest point in the sky at 03:26, 19° above your southern horizon. They will be lost to dawn twilight around 04:50, 17° above your southern horizon.
The Moon will be at mag -12.4, and Mars at mag -2.2, both in the constellation Capricornus.
The pair 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 the Moon and Mars around the time of closest approach is available here.
The positions of the two objects 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 149° from the Sun, which is in Gemini at this time of year.
|The sky on 30 June 2018|
17 days old
All times shown in PDT.
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.
|22 May 2016||– Mars at opposition|
|26 Jul 2018||– Mars at opposition|
|13 Oct 2020||– Mars at opposition|
|07 Dec 2022||– Mars at opposition|
The Moon in conjunction with Venus and Jupiter, with the Very Large Telescope in the foreground. Image © Y. Beletsky, ESO, 2009.