... The Surface Structure of the M-Type Asteroid 21 Lutetia: Spectral and Frequency Analysis V. V. Prokof'eva*, V. V. Bochkov*, and V. V. Busarev** *Research Institute, Crimean Astrophysical Observatory, National Academy of Sciences of Ukraine, p/o Nauchnyi, Crimea, 334413 Ukraine **Sternberg Astronomical Institute, Universitetskii pr. ... Comparing our estimates of the crater sizes on the asteroid 21 Lutetia to these statistical data, we can suggest that there are mostly young craters on the asteroid. ...