Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194..203m&link_type=abstract
Astrophysical Journal, vol. 194, Nov. 15, 1974, pt. 1, p. 203-212.
Astronomy and Astrophysics
Astronomy
24
Albedo, Asteroids, Infrared Radiometers, Size Determination, Infrared Astronomy, Mineralogy, Natural Satellites, Optical Measurement, Reference Stars, Silicates, Ubv Spectra
Scientific paper
The radiometric method of measuring the albedos and sizes of small airless objects was applied to forty asteroids. The largest asteroids were revealed to be 1 Ceres, 2 Pallas, 4 Vesta, 10 Hygiea, and 511 Davida. The highest albedo belonged to 4 Vesta. The darkest asteroids were 19 Fortuna, 324 Bamberga, and 747 Winchester. A comparison of the derived diameters and albedos with photometrically measured colors reveals three distinct classes of objects. The largest group is those with red color and albedos in the lunar range. The second group, which includes most of the largest objects, is characterized by more neutral color and lower albedo. The third class has one member, 4 Vesta, an object of high albedo and intermediate color. Objects in the first group have surfaces composed presumably of silicate minerals. The second and third groups may be similar in composition to the carbonaceous chondrites and the basaltic achondrite meteorites, respectively.
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