Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.328..506m&link_type=abstract
Nature (ISSN 0028-0836), vol. 328, Aug. 6, 1987, p. 506-509. NSF-NASA-supported research.
Astronomy and Astrophysics
Astronomy
15
Comets, Perihelions, Solar System, Astronomical Spectroscopy, Atmospheric Composition, Brightness Distribution, Carbon Monoxide, Charge Coupled Devices, Comets, Bowell, Distance, Age, Irradiation, Physical Properties, Comae, Size, Features, Characteristics, Grains, Production Rate, Sublimation, Formation, Origin, Carbon Dioxide, Comet Nuclei, Astronomy, Comparisons, Ice, Spectra, Near Infrared, Wavelengths, Parameters, Telescope Methods, Ccd Methods, Brightness, Optical Properties, Earth-Based Observations,
Scientific paper
New observations of Comet Bowell at the record distance of 13.6 AU are presented. An extended coma is present, the size of which is consistent with the same slow expansion rate of roughly 1 m/s detected around perihelion. The cross-section of the solid grains within the central 10 arcsec of the coma has decreased by over an order of magnitude since 1980-84, which indicates that the coma production is declining. The decline began near R of roughly 10 AU, the same distance at which production began on the preperihelion leg. The coma at R of 10 AU or less may be formed by sublimation of CO2 or an ice of similar volatility from the nucleus.
Jewitt David
Meech Karen Jean
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