Phase Angle-induced Photometric And Spectral Effects On Vesta: Implications For The Dawn Mission

Details Phase Angle-induced Photometric And Spectral Effects On Vesta: Implications For The Dawn Mission Phase Angle-induced Photometric And Spectral Effects On Vesta: Implications For The Dawn Mission

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.3906r&link_type=abstract

American Astronomical Society, DPS meeting #42, #39.06; Bulletin of the American Astronomical Society, Vol. 42, p.1033

Astronomy and Astrophysics

Astronomy

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Scientific paper

4 Vesta is the largest basaltic asteroid that remains mostly intact today and can be considered as a model for the early stages of planetary differentiation. The NASA DAWN mission is currently on its way to Vesta and is expected to rendezvous in July 2011 for a one year orbital characterization mission. Phase angle-induced spectral effects impact the band depth of an absorption feature, the overall spectral slope and photometric calibration. Gaffey et al. (1981), Gradie and Veverka (1986), Reddy et al. (2005) and Nathues (2000 and 2010) have proven these spectral effects on laboratory and telescopic observations. We have obtained rotationally resolved near-IR (0.7-2.5 µm) spectra of Vesta in four different phase angle intervals (5-25°) using the SpeX instrument on NASA IRTF. Simultaneously, we obtained photometric lightcurves of Vesta through the DAWN FC filter set using a small telescope at Ironwood Remote Observatory over ten nights covering a phase angle range of 3.9-24.4°. Using these two data sets we intend to constrain phase angle induced spectral effects, and photometric phase coefficients that would be helpful in calibrating early DAWN FC and VIR data. Preliminary results from this effort will be presented at the meeting. VR's research was supported by NASA NEOO Program Grants NG04GI17G and NASA PGG Program grant NNX07AL29G. Portions of this work were supported by PAST grant NNG05GF90G.

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