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Radiometric diameters for an additional 22 asteroids
Morrison, D.; Chapman, C. R.
Astrophysical Journal, vol. 204, Mar. 15, 1976, pt. 1, p. 934-939. (ApJ Homepage)
Publication Date:
Lunar and Planetary Exploration
NASA/STI Keywords:
Albedo, Asteroids, Diameters, Infrared Radiometers, Size Determination, Astronomical Catalogs, Chondrites, Planetary Composition, Spectrophotometry
Bibliographic Code:


Ten-micron radiometry of 24 asteroids, 22 of which have not previously had their diameters and albedos determined, is presented. The magnitudes of the objects ranged from -0.35 to +5.35 and 13 of them had diameters smaller than 100 km. They ranged in albedo from 0.024 to 0.28, and the 22 previously unstudied objects included 10 C asteroids, seven S asteroids, three U asteroids, and two unknown. In the diameter-albedo plane, ten of the asteroids studied clustered near albedo 0.03 and diameter 100-200 km, in a region previously occupied by only seven asteroids but where Chapman et al. (1975) predicted many objects would be identified upon sampling those fainter than V equals about 12. The new data suggest that there are substantial numbers of S asteroids with diameter less than 100 km in the inner part of the belt.

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