Dark Halo Crater (Impact, Optical)
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.
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).
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