Other
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jbaa..101..264m&link_type=abstract
Journal of the British Astronomical Association, vol.101, no.5, p.264-283
Other
1
Mars, Amateur Planetary Observation
Scientific paper
This report is a discussion of 3,441 observations of the 1988 perihelic opposition covering the period 1987 November to 1989 June. The widespread utilisation of CCD techniques by both amateurs and professionals led to the detection of the finest surface details ever recorded from Earth. Of the albedo features, the Huygens crater was still visible as a dark spot in Iapigia, while Nepenthes continued to be faint or invisible. Solis Lacus, as in 1986 was large and complex, with Phasis (fading) and Gallinaria Silva nearby. The Acampsis 'canal' reappeared, and there was a secular darkening of part of the Memnonia desert. Mare Serenum was again shortened at its W end, and the Aetheria darkening persisted. Oxia Palus, Achilles Fons and Idaeus Fons were all large and dark. Around opposition the Martian atmosphere was very transparent, with a pronounced Blue Clearing. No global dust storm occurred at perihelion on August 11, but two important local storms were followed. One began in Hellas in June, and another started in Thaumasia in November. The earlier storm caused a sudden darkening of Mare Serpentis, Pandorae Fretum and the E end of Sinus Sabaeus. The N limb was marked by the N polar hood for most of the apparition: a N polar cap emerged in 1989. The S polar cap recession was in close accord with Slipher's mean curve, differing slightly but significantly from 1986, when the cap had been slightly smaller than average over the period Ls=210-250 . The fragmentation of the cap was studied in detail.
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