期刊
ASTROPHYSICAL JOURNAL
卷 809, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/809/1/92
关键词
minor planets, asteroids: general; surveys
资金
- W.M. Keck Institute for Space Studies (KISS) at Caltech
- Willner Family Leadership Institute Ilan Gluzman (Secaucus NJ)
- Israeli Ministry of Science
- Israel Science Foundation, Minerva
- I-CORE Program of the Planning and Budgeting Committee
- JPL/Caltech
- Centre National d'Etudes Spatiales of France
- Korean Ministry of Science and Technology
- Orbital Sciences
- University of California at Berkeley
- Laboratoire d'Astrophysique de Marseille
- Caltech
- Columbia University
- Las Cumbres Observatory Global Telescope Network
- Lawrence Berkeley National Laboratory
- National Energy Research Scientific Computing Center
- University of Oxford
- Kavli Institute for the Physics and Mathematics of the Universe
- Los Alamos National Laboratory
- Oskar Klein Centre
- University System of Taiwan
- University of Wisconsin Milwaukee
- Weizmann Institute of Science
- NASA
- Planetary Science Division of NASA
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Council for England
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009987] Funding Source: National Science Foundation
We present ultraviolet (UV) photometry (near-UV (NUV) band, 180-280 nm) of 405 asteroids observed serendipitously by GALEX from 2003 to 2012. All asteroids in this sample were detected by GALEX at least twice. Unambiguous visible-color-based taxonomic labels (C type versus S type) exist for 315 of these asteroids; of these, thermal-infrared-based diameters are available for 245. We derive NUV - V color using two independent models to predict the visual magnitude V at each NUV-detection epoch. Both V models produce NUV - V distributions in which the S types are redder than C types with more than 8 sigma confidence. This confirms that the S types' redder spectral slopes in the visible remain redder than the C types' into the NUV, this redness being consistent with absorption by silica-containing rocks. The GALEX asteroid data confirm earlier results from the International Ultraviolet Explorer, which two decades ago produced the only other sizeable set of UV asteroid photometry. The GALEX-derived NUV - V data also agree with previously published Hubble Space Telescope (HST) UV observations of asteroids 21 Lutetia and 1 Ceres. Both the HST and GALEX data indicate that NUV band is less useful than u band for distinguishing subgroups within the greater population of visible-color-defined C types (notably, M types and G types).
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