L54: Hippalus Rilles

Hippalus rilles traces the outskirts of Mare Humorum’s eastern borders. Plainly visible was rille I, that cuts right through the flooded Hippalus crater.  Rilles II and III, between Hippalus and Campanus/Mercator, were more difficult and only visible at moments of perfect seeing. Rille IV was not seen.

Sketch made on 4 October 2014 using a SkyWatcher 10″ and a Televue Nagler zoom 3-6 mm. North is towards the bottom of the sketch.