Mons Rümker lunar dome on the moonThe week of March 8-14 takes us from Lunar Day 25 to Day 2. This week we will highlight Mons Rümker, a complex of domes in the northern part of Oceanus Procellarum early Tuesday morning.

Mons Rümker is an extensive complex of domes on the moonMons Rümker: [NW/E4] Unfortunately this feature is too close to the Moon’s limb to see it very clearly, so coordinate your viewing with a favorable libration (which will be the case Tuesday morning). In spite of its name, Mons Rümker is not really a mountain, it’s an extensive complex of domes. The diameter of the formation is over 40 miles. Although there are about a dozen domes here1, through a telescope it looks like a mound with a bumpy surface. Several of the domes have summit pits. Can you make any of them out?

1 Some sources say 30; how many can you see?


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

Andrew Planck

Author and Astronomer Andrew Planck shepherds you to the moon and its mysteries of intrigue and surprise. Learn about the moon’s most fascinating objects, understand how the moon was formed and the names of many of the craters … and why they honor individuals who have changed the course of history.
Andrew Planck
Mons Rümker: Lunar Dome on the Moon

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