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Hesiodus crater ray


Nyctimene
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Just came in from a short view at the moon with the 130 P Flextube. Spotted unplanned the last phase of the light-shadow phenomenon "Hesiodus crater ray". The floor of Hesiodus was already well lit, but close to the crater wall, that separates Pitatus from Hesiodus, and that contains the gap, through which the sunlight is projected on Hesiodus' floor, the wall's  shadow was still visible, and separated by the cone-shaped ray. Magnification was 100-150x (Seben zoom).The beginning of the phenomenon was scheduled for 10.15 UT, and I had not expected, that it would last that long. The next favourable chance to spot this ray will be for Europe March 30, 2023, UT 20.20, with the moon high up in Gemini, according to this:

http://www.lunar-occultations.com/rlo/rays/hesiodusp.htm

A nice overview about lunar clair-obscure effects (Lunar X, V etc.):

https://astronomy.com/magazine/2018/11/observe-shadow-play--on-the-moon

Stephan

 

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