The HELIOS spacecraft zodiacal light photometers used for comet observations and views of the Comet West bow shock

Details The HELIOS spacecraft zodiacal light photometers used for comet observations and views of the Comet West bow shock The HELIOS spacecraft zodiacal light photometers used for comet observations and views of the Comet West bow shock

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990em%26p...48..139j&link_type=abstract

Earth, Moon, and Planets (ISSN 0167-9295), vol. 48, Feb. 1990, p. 139-163.

Computer Science

4

Bow Waves, Helios A, Helios B, Shock Waves, Spectrophotometers, West Comet, Brightness Distribution, Color, Interplanetary Dust, Polarization (Waves), Visible Spectrum, Zodiacal Light

Scientific paper

Observations of Comet West (1976VI) and Comet Meier (1978XXI), obtained during and after their perihelion passages with the UBV zodiacal-light photometers on the Helios A and Helios B spacecraft, are reported and analyzed. The motion of Comet West with respect to the earth and to Helios A and B is characterized and illustrated with diagrams, and the data are presented graphically. The extensive ion and dust tails of Comet West are detected as blueing and reddening, respectively, in the Helios observations, whereas Comet Meier is more compact and bluer, with little evidence of a dust tail. A 'bump' of increased brightness in the interplanetary medium ahead of Comet West is attributed to a bow shock and shown to be consistent with previous direct observations indicating neutral-gas production rates about 2.5 times greater than those seen in Comet Halley.

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