Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Dark or Bright Halo Pit

  • Henrik Hargitai
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_150

Definition

Rimless depression (pit crater, caldera) surrounded by a low or high albedo annulus, or halo.

Synonyms

Thedepression with dark halo: on the Moon: Alphonsus-type dark halo crater (Head and Wilson 1979);  Dark halo craterlet; Dark-haloed crater/pit. With bright halo: bright halo crater; On Mercury: (diffuse) red spots. The deposit: dark mantling material (Wilhelms and McCauley 1971);  Localized dark mantle deposit

Description

Dark- or bright-haloed depressions are generally noncircular/irregular depressions with no sharply raised rim. They have smooth, untextured haloes that are darker or brighter or of a different color than their surroundings. The pit craters on the Moon are often aligned with linear rilles, lineaments, occurring along linear fractures. Rays are not observed.

Morphometry

On the Moon, pits have a radius of about 1 km, with deposits extending to 3–5 km from the pit. On Mercury and Io, they (calderas/paterae) are an order of magnitude larger.

Interpretation

Volc...

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References

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  12. Wilhelms DE, McCauley JF (1971) Geologic map of the near side of the Moon. U.S. Geological Survey; Miscellaneous geologic investigations map, Flagstaff, I-703Google Scholar

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA