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We present ultraviolet photometry (NUV band, 180--280 nm) of 405 asteroidsobserved serendipitously by the Galaxy Evolution Explorer (GALEX) from2003--2012. All asteroids in this sample were detected by GALEX at least twice.Unambiguous visible-color-based taxonomic labels (C type versus S type) existfor 315 of these asteroids; of these, thermal-infrared-based diameters areavailable for 245. We derive NUV-V color using two independent models topredict the visual magnitude V at each NUV-detection epoch. Both V modelsproduce NUV-V distributions in which the S types are redder than C types withmore than 8-sigma confidence. This confirms that the S types' redder spectralslopes in the visible remain redder than the C types' into the NUV, thisredness being consistent with absorption by silica-containing rocks. The GALEXasteroid data confirm earlier results from the International UltravioletExplorer, which two decades ago produced the only other sizeable set of UVasteroid photometry. The GALEX-derived NUV-V data also agree with previouslypublished Hubble Space Telescope (HST) UV observations of asteroids 21 Lutetiaand 1 Ceres. Both the HST and GALEX data indicate that NUV band is less usefulthan u band for distinguishing subgroups within the greater population ofvisible-color-defined C types (notably, M types and G types).

Asteroids in GALEX: Near-ultraviolet photometry of the major taxonomic groups