The week of August 7-13 takes us from Day 21 to Day 27. This week we will highlight Catena Davy on the moon which is viewable Tuesday morning before sunrise.

Catena Davy: [SW/L9; L=7°W] This fascinating moon crater chain was made when a comet or asteroid was torn into pieces by the gravitational pull of the Earth or the Moon. The alignment of smaller pieces flying through space then slammed into the Moon in machine-gun fashion, leaving a trail of small craters in a straight line. The largest of these craterlets is only a few miles wide and requires high magnification and good seeing.


The Perseid meteors will be viewable on Saturday.


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
Catena Davy: Moon Crater Chain
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