July 27, 2022

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Humboldt 2

Originally published September 4, 2012 LPOD-Sep4-12.jpg
LRO mosaic compiled by Maurice Collins using not-quite matching image strips

Humboldt would be the most impressive lunar crater if it were closer to the Moon's central meridian. We have some great terrestrial views but it was Kaguya that revealed the complex nature of this huge floor-fractured crater. Both of those images were somewhat high Sun so the entire crater floor and the interiors of smaller craters were well seen. This new LRO mosaic constructed by Maurice presents Humboldt under a lower Sun that emphasizes the rough texture of the floor. The right side of the crater below the triplet craters appeared as light-hued and smooth on earlier images, but here we see it is sprinkled with low hills, similar but smaller than those on the north side of the crater. The smoother terrain to the left, partly hidden by shadows, is probably impact melt, but the smooth patch at upper right is dark mare lava. It is one of the dark patches that we see when the sun is high. To really understand any place on the Moon we need multiple images - now with many images from LRO under different conditions we are getting them.

Chuck Wood

Related Links
Rükl plate 60

Yesterday's LPOD: Not the Mare

Tomorrow's LPOD: What's the Pink?

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