Conjunction between the Moon and Neptune
2017 May 20
Dominic Ford – originally published on In-The-Sky.org
The Moon and Neptune will make a close approach, passing within 0°27' of each other.
From London (click to change), the pair will be difficult to observe as they will appear no higher than 15° above the horizon. They will be visible in the dawn sky. They will rise at 02:42 (BST), 2 hours and 19 minutes before the Sun, and attain an altitude of 15° above the south-eastern horizon before fading from view as dawn breaks at around 04:34.
At the moment of closest approach, the Moon will be at mag -11.6, and Neptune at mag 7.9, both in the constellation Aquarius.
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 the Moon and Neptune 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 75° from the Sun, which is in Taurus at this time of year.
The details of this observing event were provided courtesy of In-The-Sky.org