Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Dark Halo Crater (Impact, Optical)

Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_97

Definition

A spot or annulus around an impact crater, having an albedo that is anomalously different from that of the surroundings, in some instances occurring with similar rays. Fresh, immature ejecta normally appears bright. Therefore bright halo is usually considered the regular variant and dark as anomalous.

Synonyms

 Dark haloed impact crater; Mars: dark spot (Malin et al. 2006; Daubar et al. 2013); Mercury: red spot (different from red spot, Moon); Moon: grey nimbus (Elger 1895);  Dark halo craterlet; Bright halo crater on dark deposit

Description

Generally circular craters with raised rim surrounded by dark (or reddish or bright) haloes, commonly occurring with rays, often found with secondary craters. Dark halo and/or dark rays may only extend beyond a halo of bright proximal ejecta (e.g., Fig. 2, Copernicus H).

Subtypes

The same crater may possess a proximal halo-and-ray system and another that extends beyond the ejecta (Fig. 1). These may represent ejected materials (Head...
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References

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA