The week of November 6-12 takes us from Day 24 to Day New Moon. This week we will highlight the moon crater Doppelmayer, viewable before sunrise on Tuesday and Wednesday and located in the SW quadrant of the Field Map at M5.

Doppelmayer: [SW/M5; L=41°W] Doppelmayer, on the southwest shore of Humorum, is another great example of crater subsidence. The inundated top of the north rim of Doppelmayer is so close to the surface that, under low lighting, we can see its ghost image bleeding through to the surface as a wrinkle ridge.


On Thursday, Venus is 1° south of the Moon.


It is highly recommended that you get a copy of Sky and Telescope’s Field Map of the Moon, the very finest Moon map available for use at the telescope. It is available for $10.95 at and on Amazon. All features mentioned in this blog will be keyed to the grid on the Field Map and will look like this: Plato: [NW/D9]

Courtesy of Gray Photography of Corpus Christi, Texas
Lunar photos: NASA / USGS / BMDO / LROC / ASU / DLR / LOLA / Moon Globe. Used by permission

Andrew Planck
Doppelmayer – Crater Subsidence on the Moon
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