The results of a comparison of the albedo of the main belt asteroids and certain types of meteorites.
The data from the TRIAD file (111 S, U, M-asteroids) and from the authors' spectrophotometric measurements of achondrites and ordinary chondrites from the Leningrad Mines Museum collection (90 samples) have been used for comparison of the reflection coefficient of minor planets and meteorites. The geometrical albedo is known from astrophysical observations being calculated by means of the planet brightness measurements at the totality phase. The meteorite albedo has been obtained by means of light flux measurements in the integrating sphere of the spectrophotometer. The photoelectric polarimeter designed at the Sternberg State Astronomical Institute has been used to find the relationship between geometrical and plane albedo. The analysis of the plane albedo distribution histogram allows to conclude that on the average the albedo of the meteorites with unweathered surface is higher than that of asteroids and is mainly in the range 20 - 40%. The range of the variations of the light asteroids albedo is 10 - 20%. If the silicate minerals on the S-asteroids surface are not darker than their meteoritic analogs, then the difference found in albedo throws doubt upon the mineralogical interpretation of S-asteroids as stone-iron objects.
Kinematika i Fizika Nebesnykh Tel
- Pub Date:
- December 1989
- Brightness Distribution;
- Lunar and Planetary Exploration;
- Minor Planets: Albedo;
- Meteorites: Albedo