Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jbaa..105..117m&link_type=abstract
Journal of the British Astronomical Association, vol.105, no.3, p.117-134
Astronomy and Astrophysics
Astronomy
3
Mars, 1993 Observations
Scientific paper
An account of the 1992-93 apparition, in which minor (but significant) albedo changes occurred on the martian surface. Solis Lacus remained large and dark, Phasis had faded but Gallinaria Silva remained visible. The Aetheria secular darkening persisted, the Huygens crater in Iapigia could= still be identified, Nepenthes continued to be invisible, and the W. (IAU) end of Mare Sirenum was still truncated. Pandorae Fretum was rather dark. The exceptional Idaeus Fons-Achillis Fons development on Nilokeras persisted. The Cerberus-Trivium Charontis complex continued the fading which had begun in 1990. The northern hemisphere was favourably displayed for the first time since 1984, and the areography of the Utopia-Boreosyrtis region was seen to be broadly unaltered. There was little dust activity, but the presently favoured Chryse source was again active on at least two occasions, on 1992 August 31 (Ls=3D 316deg) and October 2-3 (Ls=3D 333-33 4deg). This local activity continued with a minor dust storm in Elysium-Cebrenia that began on February 12 (Ls=3D 39deg). White cloud activity was seasonally normal. The observations covered the period of northern hemisphere winter and spring, and much of the regression of the North Polar Cap could be observed. Its behaviour closely followed the Dollfus-Baum historical mean from Ls=3D25 deg onwards, but the cap/hood was somewhat smaller than usual before then. This report of the work of 89 observers covers the period 1992 May to 1993 August.
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