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Multi-epoch Spitzer Space Telescope 24 micron data is utilized from theMIPSGAL and Taurus Legacy surveys to detect asteroids based on their relativemotion. These infrared detections are matched to known asteroids androtationally averaged diameters and albedos are derived using the Near EarthAsteroid Model (NEATM) in conjunction with Monte Carlo simulations for 1835asteroids ranging in size from 0.2 to 143.6 km. A small subsample of theseobjects was also detected by IRAS or MSX and the single wavelength albedo anddiameter fits derived from this data are within 5% of the IRAS and/or MSXderived albedos and diameters demonstrating the robustness of our technique.The mean geometric albedo of the small main belt asteroids in this sample isp_V = 0.138 with a sample standard deviation of 0.105. The albedo distributionof this sample is far more diverse than the IRAS or MSX samples. The cumulativesize-frequency distribution of asteroids in the main belt at small diameters isdirectly derived. Completeness limits of the optical and infrared surveys arediscussed.

The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer