Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...35..336l&link_type=abstract
Icarus, vol. 35, Sept. 1978, p. 336-343.
Astronomy and Astrophysics
Astronomy
33
Asteroids, Astronomical Photometry, Infrared Astronomy, Visual Photometry, Albedo, Astronomical Models, Calibrating, Carbonaceous Chondrites, Infrared Radiometers, Models, Photometry, Earth, Asteroids, Perihelion, Betulia Asteroid, Radiometers, Radius, Albedo, Radar, Morphology, Surface, Composition, Infrared
Scientific paper
Broadband visual and 10.6-micron photometry of 1580 Betulia was obtained during its close approach to earth in May 1976. The photometry was analyzed by using the 'radiometric method' to derive the radius (2.10 + or - 0.40 km) and albedo (0.108 + or - 0.012) of Betulia. Radar and polarimetric results indicate a radius greater than 3.0 km and a geometric albedo of about 0.05. To be compatible with these results, Betulia was also modeled as having a surface with the thermal characteristics of bare rock rather than those of the 'lunar' regolith model used for previous analysis of radiometry of other asteroids. A 3.7-km radius and a geometric albedo of about 0.04 are compatible with all available observations. Betulia is the first Mars-crossing asteroid found to have such a low albedo, which may be indicative of carbonaceous surface material.
Lebofsky Larry A.
Lebofsky Marcia J.
Matson Dennis L.
Veeder Glenn J. Jr.
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