The microwave spectrum of asteroid Ceres
This paper presents new measurements of the microwave flux of Ceres obtained at wavelengths between 3.3 mm and 20 cm using the 12 m Kitt Peak antenna and the Very Large Array. These new measurements are combined with previous measurements to confirm a substantial decrease in flux density at centimet...
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| Veröffentlicht in: | Astron. J.; (United States) 1988-04, Vol.95, p.1263-1268 |
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| container_title | Astron. J.; (United States) |
| container_volume | 95 |
| creator | Webster, W. J., Jr Lowman, P. D., Jr Johnston, K. J. Lamphear, E. S. Hobbs, R. W. |
| description | This paper presents new measurements of the microwave flux of Ceres obtained at wavelengths between 3.3 mm and 20 cm using the 12 m Kitt Peak antenna and the Very Large Array. These new measurements are combined with previous measurements to confirm a substantial decrease in flux density at centimeter wavelengths compared to millimeter wavelength. Using a statistical technique adapted from terrestrial microwave remote sensing, this spectrum has been compared with that of various candidate materials and models for the subsurface structure of Ceres. It is concluded that Ceres is largely covered with a 3-cm-thick layer whose dielectric properties resemble dry terrestrial clay. This layer may have formed by micrometeorite impact on hydrothermally altered basic or ultrabasic rock or on carbonaceous chondrite material. |
| doi_str_mv | 10.1086/114722 |
| format | Article |
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It is concluded that Ceres is largely covered with a 3-cm-thick layer whose dielectric properties resemble dry terrestrial clay. 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W.</au><aucorp>Computer Technology Associates, Inc., Lanham, MD (USA)</aucorp><aucorp>NASA, Goddard Space Flight Center, Greenbelt, MD (USA)</aucorp><aucorp>E. O. Hulburt Center for Space Research, Washington, DC (USA)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The microwave spectrum of asteroid Ceres</atitle><jtitle>Astron. J.; (United States)</jtitle><date>1988-04-01</date><risdate>1988</risdate><volume>95</volume><spage>1263</spage><epage>1268</epage><pages>1263-1268</pages><issn>0004-6256</issn><abstract>This paper presents new measurements of the microwave flux of Ceres obtained at wavelengths between 3.3 mm and 20 cm using the 12 m Kitt Peak antenna and the Very Large Array. These new measurements are combined with previous measurements to confirm a substantial decrease in flux density at centimeter wavelengths compared to millimeter wavelength. Using a statistical technique adapted from terrestrial microwave remote sensing, this spectrum has been compared with that of various candidate materials and models for the subsurface structure of Ceres. It is concluded that Ceres is largely covered with a 3-cm-thick layer whose dielectric properties resemble dry terrestrial clay. This layer may have formed by micrometeorite impact on hydrothermally altered basic or ultrabasic rock or on carbonaceous chondrite material.</abstract><cop>Legacy CDMS</cop><doi>10.1086/114722</doi><tpages>6</tpages></addata></record> |
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| ispartof | Astron. J.; (United States), 1988-04, Vol.95, p.1263-1268 |
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| language | eng |
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| source | NASA Technical Reports Server; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | 640107 - Astrophysics & Cosmology- Planetary Phenomena ASTEROIDS Astrophysics CHEMICAL COMPOSITION CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COMPARATIVE EVALUATIONS FLUX DENSITY MATHEMATICS MICROWAVE SPECTRA MORPHOLOGY REMOTE SENSING SPECTRA STATISTICS |
| title | The microwave spectrum of asteroid Ceres |
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