Millimeter and submillimeter observations of the asteroid 4 Vesta

Details Millimeter and submillimeter observations of the asteroid 4 Vesta Millimeter and submillimeter observations of the asteroid 4 Vesta

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..405r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 1, July 1992, p. 405-411.

Astronomy and Astrophysics

Astronomy

23

Astronomical Spectroscopy, Light Curve, Submillimeter Waves, Vesta Asteroid, Albedo, Infrared Astronomy Satellite, Millimeter Waves, Radio Astronomy, Signal To Noise Ratios

Scientific paper

Precise and well-calibrated observations made with the James Clerk Maxwell Telescope are presented of the submillimeter thermal spectrum and light curve of the asteroid 4 Vesta. The disk-averaged Rayleigh-Jeans temperature is as low or lower at submillimeter wavelengths as it is at centimeter wavelengths. Although the interpretation of the spectrum is ambiguous, it seems to indicate the presence of a dusty, porous regolith. At 1 mm wavelength the rotational light curve of Vesta appears double peaked over the 5.342 hr rotation period, unlike the optical lightcurve which is single peaked. This light curve is apparently dominated by the triaxial shape of Vesta, and is not significantly distorted by the optical albedo spots.

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