The asteroid albedo scale. II - Laboratory polarimetry of dark carbon-bearing silicatesLaboratory reflection polarimetry is presented for eight samples of artificial, poorly crystalline magnesian silicates with varying admixtures of carbon black. The polarimetric slope-albedo law saturates for geometric albedos lower than about 0.05, and good agreement with the telescopic polarization-phase curves of C-type asteroids is found for albedos as low as 0.02. Thus the conclusion from thermal radiometry is confirmed that the C objects are very dark, darker than any known carbonaceous chondrite.
Document ID
19780057715
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Zellner, B. (Arizona Univ. Tucson, AZ, United States)
Lebertre, T. (Arizona Univ. Tucson, AZ, United States)
Day, K. (Arizona, University Tucson, Ariz., United States)