Geminus is a classic complex Crater with wall heights of 2.8 km in the west and 1.4 km in the East. Lacus Spei, the "Lake of Hope", is the darkest in a series of "volcanic spots" in this region of the Moon.
Origin: Impact &Volcanism Diameter: 86 km. Rukl: 16 Type: CC and Lacus
Objects: Geminus, Tycho, Lacus Spei, Messala, Berosius, Hahn
Others Identified: Bernoulli, Bernoulli A, Cleomedes, Burkhardt, Mercurius, Schumacher, Zeno
Location: Home
Date: 2025-10-07
Time: 10:25 PM ADT
Equipment: 10" Meade SCT
Eyepiece: 15 mm (SvBony 30-10mm Zoom Eyepiece)
Magnification: x167
Seeing: Fair (3-4)
Transparency: Good (3)
Note: The Full Moon was around 4:15 AM this morning. Lunar features were distinguishable due to the lighting at this time.
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RI: Geminus appeared as a long oval. Given the seemingly rough terrain and the reduced shadows on the north end of the crater, it may be shallower here than in the south. Its central peak was off-centre in the southern portion and in the same direction as the oval shape; without shadowing, this peak may not be very tall. Compare this to Tycho with its seemingly much broader, taller central peak. C1: Messala was located between Geminus and Lacus Spei. Larger than Geminus and perhaps shallow given the little shadows (which may also have been function of the lunar phase). Terracing (or slumping or infilling) at one end of the crater. Schumacker to its north. |
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C2: Berosus and Hahn found on the edge of the terminator. Cleomedes and Buckhardt had to be identified to locate these two craters. Hahn was more southerly, appeared to be longer, and had an illuminated top of the central peak. Given the shadowing in Hahn, it probably was deeper and steeper sided than Barosus. Barosus was north of Hahn, appearing slightly smaller and narrower. Its southern crater border appeared to be bent and a feature in the northern wall gave that end a sharper point. |