#astronomy Watch the Moon disguise naked-eye star Tejat in Gemini on 9 January – Astronomy Now

January 5, 2020 - Comment

Magnitude +2.9 star Mu (μ) Geminorum, higher nown as Tejat within the constellation of Gemini, is occulted (hidden) by the rising 13-day-old waxing gibbous Moon early on the night of Thursday, 9 January 2020 as seen from the British Isles. This graphic reveals the occasion’s progress as seen from London and Edinburgh, clearly demonstrating the impact


Magnitude +2.9 star Mu (μ) Geminorum, higher nown as Tejat within the constellation of Gemini, is occulted (hidden) by the rising 13-day-old waxing gibbous Moon early on the night of Thursday, 9 January 2020 as seen from the British Isles. This graphic reveals the occasion’s progress as seen from London and Edinburgh, clearly demonstrating the impact of geographical latitude. AN graphic by Ade Ashford.If the early night sky of Thursday, 9 January is obvious, observers within the British Isles get the chance to witness a conspicuous naked-eye star slip behind the rising waxing gibbous Moon. Magnitude +2.9 Mu (μ) Geminorum, with the right identify Tejat, lies close to the western fringe of the constellation Gemini. The exact time and length of the star’s disappearance behind the Moon – an occasion generally known as a lunar occultation, from the Latin occulo, ‘to cover’ – will depend on the place you reside within the UK.

Observers in London will see, climate allowing, Tejat disappear on the darkened limb (edge) of the 13-day-old Moon shortly after 5:05pm GMT (17:05 UT) and reappear on the brilliant lunar limb 45 minutes later. For a skywatcher in Edinburgh, the star’s corresponding disappearance and reappearance occasions are a couple of seconds earlier than 5:17pm GMT (17:17 UT) and 5:52pm GMT, respectively.

Mid-occultation of Tejat takes place some 15 levels (a few span-and-a-half of a fist held at arm’s size) above the UK’s east-northeast horizon. Whereas it’s a straightforward spectacle to observe in a small telescope, the star’s reappearance could be a problem for binocular customers. As with all occultation observations, it pays to be setup and scrutinising the Moon a couple of minutes earlier than the expected occasions, significantly when you dwell far from both London or Edinburgh.



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