Possible evidence for on-going volcanism on Mars as suggested by thin, elliptical sheets of low-albedo particulate material around pits and fissures close to Cerberus Fossae |
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| Authors: | Gerald Patrick Roberts Ian A Crawford David Peacock Joyce Vetterlein Elisabeth Parfitt Louise Bishop |
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| Institution: | (1) SAS, Stazione Astronomica, 28060 Sozzago, Novara, Italy;(2) DLR, Wessling, Germany;(3) IFSI/INAF, Roma, Italy;(4) GAT, Via Baracca 66, 21047 Tradate, Varese, Italy |
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| Abstract: | High quality CCD images obtained at two different observatories in North Italy allowed the identification of four morphological
structures near the nuclear region of the comet Ikeya-Zhang (I-Z): haloes, jets, shells and spirals. The interpretation of
the nature of these structures has been attempted by means of a comparison of different up-to-date image processing techniques,
which led to a single common estimate of the rotation period (p=1.48±0.20 days). |
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| Keywords: | Comets Ikeya-Zhang haloes jets rotation period shells spirals |
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