The kilometer-sized Main Belt asteroid population revealed by Spitzer E. L. Ryan, D. R. Mizuno, S. S. Shenoy, C. E. Woodward, S. J. Carey, A. Noriega-Crespo, K. E. Kraemer and S. D. Price A&A, 578 (2015) A42 Published online: 01 June 2015 DOI: 10.1051/0004-6361/201321375