Constraining Albedo and Composition of Four Potentially-Hazardous Asteroids via Near-IR Spectroscopy

Details Constraining Albedo and Composition of Four Potentially-Hazardous Asteroids via Near-IR Spectroscopy Constraining Albedo and Composition of Four Potentially-Hazardous Asteroids via Near-IR Spectroscopy

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3203r&link_type=abstract

American Astronomical Society, DPS meeting #41, #32.03

Astronomy and Astrophysics

Astronomy

Scientific paper

Near-infrared spectroscopic observations of potentially-hazardous asteroids 2005 RC34, (90403) 2003 YE45, (185851) 2000 DP107, and 2008 QS11 were obtained remotely using the SpeX instrument on NASA IRTF on Mauna Kea, Hawai'i. All data were reduced using IRAF and the PC-based SpecPR spectral processing program. Isolation of the Band I and II absorption features and calculation of band area ratios were accomplished using SpecPR. Albedo was estimated using STM based thermal modeling program, Thermflx. 2005 RC34 spectrum shows a weak inflection at 0.90±0.01 µm(<10%) with no thermal emission beyond 2.0 µm. The lack of thermal emission helps constrain the lower limit albedo of the object to be greater than or equal to 15±1%. Spectrum of 2003 YE45 shows a moderate absorption feature with a minimum at 1.0±0.1 µm (depth 20-25%) and a relatively flat spectrum beyond 1.4 µm. No thermal excess can be detected beyond 2.0 µm, which permits us to conservatively constrain the lower limit albedo to be greater than or equal to 5±1%. 2000 DP107 spectrum shows a moderately deep feature at 0.96±0.01 µm with sharp rise in reflectance beyond 2.0 µm due to thermal emission, which gives an estimated albedo of 2±1%. 2008 QS11 spectrum has a weak feature (band depth 8%) at 0.98±0.01 µm with a steep reddish slope and sharp rise in reflectance beyond 2.0 µm due to thermal emission. The measured thermal excess at 2.4 µm is 11%, which results in an estimated albedo of 5.5±1 %. Preliminary compositional analysis suggests that 2000 DP107 is a relatively dark object analogous to carbonaceous chondrites, 2005 RC34 belongs to taxonomic type E similar to aubrites or low-Fe pyroxene. 2003 YE45's surface is dominated by olivine and 2008 QS11 is similar to impact shock blackened chondrites. This research was supported by NASA NEOO Program Grants NNG04GI17G and NNX07AL29G.

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