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Infrared spectroscopic observations of 69230 Hermes (1937 UB): possible unweathered endmember among ordinary chondrite analogs |
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| Authors: | A.S. Rivkin R.P. Binzel S.J. Bus A. Saxena |
| Affiliation: | a Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 54-418, 77 Massachusetts Avenue, Cambridge, MA 02139, USA b Science Applications International Corporation, 5180 Parkstone Dr. Chantilly, VA 20151, USA c Institute for Astronomy, 640 North A'ohoku Place, Hilo, HI 96720, USA d Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA e Needham High School, 609 Webster Street, Needham, MA 02494, USA |
| Abstract: | We have obtained near-infrared (0.8-2.5 μm) spectra of Hermes (1937 UB) using the NASA Infrared Telescope Facility on Mauna Kea. We find Hermes to have spectral properties consistent with L/LL chondrites, with a strong visual similarity to Gaffey (1976, J. Geophys. Res. 81, 905) average L6 chondrites. We define a ratio of band areas (RBA) using the Modified Gaussian Method (MGM: Sunshine and Pieters, 1990, in: Lunar and Planetary Institute Conference Abstracts, p. 1223, 1993, J. Geophys. Res. 98, 9075) to quantify near-infrared asteroidal data lacking a visible component. Hermes has a spectrum nearly indistinguishable from (19356) 1997 GH3. Together, these asteroids represent new endmembers on the continuum of spectra from ordinary chondrite meteorites to large main-belt S-class asteroids. We discuss regolith effects that may be occurring on Hermes and other possible ordinary chondrite parent bodies, and constrain the albedo of Hermes to 0.4 or higher (effective diameter 650 m or smaller) if it has a regolith. This value for albedo/diameter is consistent with radar results. |
| Keywords: | Asteroids Asteroids near-Earth Asteroids composition Meteorites |
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