The long-awaited opposition of Mars on 8 December is an effective way to place the icing on high of one other nice observing yr. Contemplating its proximity to Earth, a median distance of 225 million kilometres, Mars showing at or near its greatest is a considerably elusive occasion. The purple planet involves an opposition-best (when it lies immediately reverse the Solar within the sky) on alternate years solely (its imply synodic interval is 780 days), the final opposition occurring on 13 October 2020. Due to this fact, any opposition of Mars is to be cherished.
Nevertheless, this time round there’s a tasty cherry on high of the icing within the type of an occultation of Mars by the complete Moon on the morning of 8 December, an occasion to not be missed.
Mars is at opposition the night time of seven/8 December (at 05:36 UT), when it shines brilliantly at magnitude –1.9, solely half a magnitude fainter than Jupiter, and provides telescopic observers a disc spanning a really wholesome 17 arcseconds. Driving excessive among the many stars of Taurus, the Bull there’s no points with poor altitude not like on the 2020 opposition, because the purple planet lies 20° greater within the night time sky. Mars is above 30° in altitude from about 7.30pm to 5am GMT, peaking at an elevation of round 60° when it crosses the southern meridian at midnight or so.
A small telescope to resolve Mars’ main darkish markings, and proprietor’s of medium- to large-aperture telescopes and high-resolution imaging set-ups to collect scientifically-valuable information. Mars’ most well-known function, the ‘V’ formed Syrtis Main, lastly rotates into view at Mars’ following limb from round 3am GMT on opposition night time. Nevertheless, you’d higher be fast when observing or imaging it as right here comes the Moon!
Mars hidden by the Moon!
An occultation of a planet by the Moon that’s seen throughout the entire of the UK isn’t a standard occasion and is one to tug out all of the stops to attempt to observe it.
At about 7pm GMT on 7/8 December, Mars and the Moon are nicely up within the east and lie 4.2° aside, offering a effective sight with the bare eye and thru a pair of 10 x 50 binoculars. Because the night wears on, examine intermittently on their progress whilst you’re observing or imaging Mars and also you’ll see the Moon closing in on Mars. By 3am Moon has closed inside a level or so of the purple planet, the pair now mendacity half approach up the western sky.
Scotland will probably be first to witness the occultation; from Edinburgh, the Moon begins to maneuver over Mars at about 4.52am GMT, with the occasion starting at about 5am GMT for observers in London. Mars and the Moon are round 30 and 27 levels up from Edinburgh and London, respectively. As with all occultation occasions, remember to be prepared to look at a minimum of a couple of minutes earlier than.
It’s a disgrace the Moon is at full phase (4.08am GMT) as observers must take care of its highly effective glare, however naked-eye observers ought to be capable of get a very good view by hiding the Moon along with your hand. In contrast to when a star winks out instantaneously, Mars, with its 17.1” disc, takes its time. Excessive-power telescopic views will probably be particularly spectacular, as it will likely be fascinating to observe whereas Mars takes about 35 seconds or so to fully disappear behind the Moon.
Mars is accompanied by star, magnitude +9.6 HIP 23032, which lies about half a level to the south-west and is occulted seconds earlier than Mars.
Mars is hidden from view for an hour or so, reappearing at about 5.53am and shortly earlier than 6am from Edinburgh and London, respectively.
