Lunar Session - April 17, 2019

This session was devoted to lunar observing. Three IWLOP objects were viewed.

Lunar Phase: Waxing Gibbous (96.9%)
Q-Day: 4

Moonset: 5:54 AM        Moonrise: 5:54PM     
Sunrise: 6:27 AM          Sunset: 8:02 PM

Location: Home
Date: 2019-04-17
Time: 8:00 PM - 11:30 PM
Equipment: 10" Meade SCT, 33 mm + 9.7 mm
Magnification: x76 + x258
Transparency: Good (3)
Seeing: Good (3)
Temperature: -2º C
SQM: 17.81

No wind or clouds. Jerry set up the telescope for me then I began looking for things on my observe list - 13 items, depending on where light and the terminator were located. I found Grimaldi (on the list) and then had 3 surprises due to the SW limb being librated - Bailly, Cassatas and Klaproth.

Bailly One of Bailly's walls was on the terminator but features of its crater walls and rough floor were quite evident. Refer to IWLOP #L8 (Libration Object) - Bailly for details of the observation. Cassatas and Klaproth Smooth floors, small in size and the overlay of one crater over the other reminded me of Sirsalis/Sirsalis A. Refer to IWLOP #107 - Klaproth & Casssatus for details of the observation.

Grimaldi This was the first time viewing this crater. Grimaldi's west wall was on the terminator. The almost lace-like Damoiseau was to the east with Sirsalis and Sirsalis A to the S-SE. Appeared to be doors on the very dark floor. Refer to IWLOP #134 - Grimaldi for details.