Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-20
Astronomy and Astrophysics
Astrophysics
Appearing in Feb 2002 Astronomical Journal, volume 123; 15 pages of text plus 2 figures (1 color); AASTeX format for the origi
Scientific paper
10.1086/338436
We have measured the mid-infrared thermal continua from two Centaurs, inactive (8405) Asbolus and active 95P=(2060) Chiron, and have constrained their geometric albedos, p, and effective radii, R, with the Standard Thermal Model for slow rotators. These are the first such measurements of Asbolus; we find R=33 km +/- 2 km and p=0.12 +/- 0.03. This albedo is higher than all of those confidently known for active cometary nuclei. The thermal inertia is comparable to or lower than those of main belt asteroids, the Moon, and Chiron; lower than those of the icy Galilean satellites; and much lower than those of near-Earth asteroids. For Chiron, we find R=74 km +/- 4 km and p=0.17 +/- 0.02. While this albedo is consistent with the established value, previous radiometry by others implied a larger radius. This effect may be partially due to a varying infrared dust coma but all datasets have too low signal to be sure. Four Centaur albedos (out of about 30 objects) are now known. They show a diversity greater than that of the active comets, to which they are evolutionarily linked.
Fernandez Yan R.
Jewitt David C.
Sheppard Scott S.
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