Mare Humorum, also known as the "Sea of Moisture", is a lunar mare located in an impact basin that is 425 km across. Gassendi is the large impact crater on the north edge of Mare Humorum. The crater floor contains a system of long, narrow depressions known as rilles. To the south lies the partially flooded crater Doppelmayer. Both Gassendi and Doppelmayer were formed before the impact that created the mare.

ZWO ASI290MM CMOS camera with IR pass filter, Celestron C8 SCT (f/10, 2000mm FL), SkyWatcher EQ6-R Pro mount

The best 500 frames were stacked with AutoStakkert, wavelets were adjusted with Registax 6, other post-processing (levels, sharpening and noise reduction) with Photoshop CS2 and PhotoScape X.