IWLOP #068 - Montes Alpes & Vallis Alpes
Spectacular boundary of the Mare Imbrium Basin, with heights from 1.8 to 2.4 km ranging up to 3.6 for the great Mont Blanc. The impressive Vallis Alpes runs perpendicular to the prominent Montes Alpes, making this one of the most picturesque areas of the Moon. The valley is a wide rift valley, 180 km in length that links Mare Frigoris to Mare Imbrium.
Location: 46.0 N 3.0 E-3.0 W Origin: Impact and Volcanic Length: 250 km (Montes Alpes), 166 km (Vallis Alpes) Rukl: 12, 4
Type: Mount and Valley
Objects: Montes Alpes, Vallis Alpes, Mare Frigoris, Mare Imbrium, Cassini, Cassini A, Cassini B, Theætetus, Promontoria Agassiz & Deville, Mont Blanc
Time: 8:30 PM ADT
Equipment: 10" Meade SCT, 10 mm eyepiece + x2 Barlow
Seeing: Good (3)
Transparency: Good (3)
R1: The shadows extending from Montes Alpes were quite long in some areas. Refer to the sketch below.
R2: Vallis Alpes was quite wide and very easily identified; its shadow was on the northern edge.
R3: Cassini had low walls and two craters - A and B - were on its floor. Theætetus was also low-walled SE of Cassini. Refer to the sketch below.
C1: The Promontorium Agassiz and Promontorium Deville were sketched. They in essence formed a shallow bay on Mare Imbrium. Mont Blanc was to their north.
C2: The sinuous rille was seen; it had a varying width away from straight rille. Shadow on its north rim.