#astronomy Watch because the Moon blots out brilliant stars – Astronomy Now

September 4, 2021 - Comment

Watching a brilliant star disappearing or reappearing from occultation behind the Moon’s limb is all the time an thrilling statement to make. In case you’ve not but seen this occur then back-to-back occasions involving two of the brightest stars to be occulted this 12 months, present good alternatives so that you can break your duck.


Watching a brilliant star disappearing or reappearing from occultation behind the Moon’s limb is all the time an thrilling statement to make. In case you’ve not but seen this occur then back-to-back occasions involving two of the brightest stars to be occulted this 12 months, present good alternatives so that you can break your duck.

Within the small hours of two September, Mebsuta ((epsilon [ε] Geminorum, magnitude +2.9) reappears on the Moon’s darkish limb following an occultation. AN graphic by Greg Smye-Rumsby.

On half September (Wednesday night/Thursday morning), Mebsuta (epsilon Geminorum) takes centre stage, reappearing on the Moon’s darkish limb. On the next evening, 2/three September (Thursday night/Friday morning), it’s the flip of kappa Geminorum within the highlight when you’ll be able to observe each its disappearance and reappearance. All that you must get pleasure from each occasions is a humble pair of 10 x 50 binoculars, end up an observing location with a transparent view of the horizon from the north-east round to the east and never thoughts shedding a little bit of sleep.

Within the early hours of two September, the Moon is a waning, 24.5-day-old crescent when it rises in Gemini at about 12.30am BST. At between about 1.08am and 1.18am BST (later timings happen progressively additional north), the Moon blots out magnitude +2.9 Mebsuta on the brilliant lunar limb, although this may increasingly show robust to see because the pair are at a lowly altitude of between 4 and eight levels (the Moon seems greater within the sky the additional north you go). Slightly below an hour later, at between 2.00am and 02.11am BST, Mebsuta peeks out from behind the Moon’s darkish limb. By this time our satellite tv for pc has climbed to between round eight and 13 levels.

On the morning of three September, magnitude +three.5 kappa (κ) Geminorum is occulted by a waning-crescent Moon. Each the celebrities disappearance and reappearance might be noticed throughout the UK. AN graphic by Greg Smye-Rumsby.

Subsequent morning, on three September, magnitude +three.5 kappa Geminorum disappears on the Moon’s brilliant limb between three.37am and three.47am BST, with the Moon mendacity at a way more beneficial altitude of between 13 and 18 levels. About an hour later, at between four.41am and four.47am BST, kappa emerges on the Moon’s darkish limb at an altitude of between 21 and 26 levels.



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