The First Far Ultraviolet Spectrum of an Asteroid: ALICE Observations During Rosetta's Flyby of (2867) Steins

Details The First Far Ultraviolet Spectrum of an Asteroid: ALICE Observations During Rosetta's Flyby of (2867) Steins The First Far Ultraviolet Spectrum of an Asteroid: ALICE Observations During Rosetta's Flyby of (2867) Steins

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....40.2836a&link_type=abstract

American Astronomical Society, DPS meeting #40, #28.36; Bulletin of the American Astronomical Society, Vol. 41, p.558

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During Rosetta's flyby of the main-belt, E-type asteroid (2867) Steins on 5 Sept. 2008, the U. S. ALICE UV imaging spectrometer was used to obtain the first far-ultraviolet spectrum of an asteroid. A ten-minute integration, averaging over a variety of geometries, shows very good signal from 850 Å to 2000 Å. These data also represent the first spectrum of an E-type asteroid below the atmospheric cutoff and the first ultraviolet spectrum of a small asteroid and they extend to shorter wavelengths than have been observed for any other asteroid. We find that the far ultraviolet albedo of Steins is very low compared to its visible albedo (Weissman et al. 2008; Jorda et al. 2008), as is expected from the UV behavior of many refractory materials. We also find that the albedo does not show a dramatic color variation over the FUV spectral range. In addition, Alice obtained the total FUV count rate integrated with 1-second resolution during the encounter to determine the average variation of reflected UV flux with phase angle, which we will present. As expected from the only existing model (Schläppi et al. 2008), a deep search for any exosphere, e.g., hydrogen, yielded no obvious detections in our initial analysis. Funded by NASA.
Jorda, L., et al. 2008. A. & Ap. 487, 1171.
Schläppi, B., K. Altwegg, and P. Wurz 2008. Icarus 195, 674.
Weissman, P.R., et al., 2008. Meteoritics and Planetary Science, 43, 1-10

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