Variability of Thermal Emission from Large Asteroids

Details Variability of Thermal Emission from Large Asteroids Variability of Thermal Emission from Large Asteroids

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.3404b&link_type=abstract

American Astronomical Society, DPS meeting #35, #34.04; Bulletin of the American Astronomical Society, Vol. 35, p.976

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We have obtained submillimetric observations of the asteroids 4 Vesta and 2 Pallas at 870 μm , carried out with the MPIFR 19-channel bolometer on the Steward Observatory 10-m Submillimeter Telescope during December 2001 and May 2003. The result of these observations are fully sampled thermal lightcurves, folded according to rotational phase. Vesta lightcurves are similar single-peaked shapes for both epochs, but the variation in 2003 has approximately half the amplitude of that in 2001. Pallas has been observed at one epoch, at large geocentric distance; however, variations of 20% are still apparent in the lightcurve. For both asteroids, the general appearance of the lightcurves varies inversely to the visual lightcurves at the same rotational phase. We present the viewing geometry and thermal lightcurve of Pallas for comparison to visual lightcurves. We compare both epochs of Vesta lightcurves and compare to the geologic units derived from HST observations (Thomas et al, 1997; Binzel et al. 1997).

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