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Physical characterization of low delta-V asteroid (175706) 1996 FG3

Wolters, Stephen D.; Rozitis, Ben; Duddy, Samuel R.; Lowry, Stephen C.; Green, Simon F.; Snodgrass, Colin; Hainaut, Olivier R. and Weissman, Paul (2011). Physical characterization of low delta-V asteroid (175706) 1996 FG3. Monthly Notices of the Royal Astronomical Society, 418(2) pp. 1246–1257.

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Asteroid (175706) 1996 FG3 is a binary asteroid and the baseline target for the proposed MarcoPolo-R sample return mission. We present thermal-infrared photometry obtained with the European Southern Observatory (ESO) Very Large Telescope using the VISIR instrument, together with optical photometry obtained with the ESO New Technology Telescope using the EFOSC2 instrument. An absolute visual magnitude HV =17.833±0.024 and phase parameter G=−0.041 ± 0.005 are derived. The near-Earth asteroid thermal model has been fitted to the measured fluxes to derive a geometric visual albedo pv = 0.046 ± 0.014, effective diameter at the observed aspect Deff = 1.68 ± 0.25 km and beaming parameter η = 1.15 for phase angle α = 11.°7. The advanced thermophysical model (ATPM) has been fitted to the measured fluxes to derive a more accurate effective diameter Deff = 1.71 ± 0.07 km and albedo pv = 0.044 ±0.004. Based on the ATPM results, assuming the same albedo for primary and secondary, we derive a primary mean spherical diameter Dp = 1.69+0.18−0.12 km, secondary diameter Ds =0.51 ± 0.03 km and a secondary orbital semimajor axis a = 2.8+1.7−0.7 km. A low surface thermal inertia Γ = 120 ± 50 J m−2 s−1/2 K−1 was also derived, suggesting a dusty surface and raising questions as to the binary formation mechanism of this asteroid. These physical properties are used to predict a Yarkovsky drift in semimajor axis of −60+31−45 m yr−1.

Item Type: Journal Item
Copyright Holders: 2011 The Authors, 2011 RAS, Monthly Notices of the Royal Astronomical Society
ISSN: 1365-2966
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetUK Science and Technology Facilities Council
Not SetNot SetEuropean Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 268421.
Keywords: radiation mechanisms - thermal; minor planets, asteroids -individual - (175706)1996FG3; infrared - general.
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 30594
Depositing User: Simon Green
Date Deposited: 05 Jan 2012 12:10
Last Modified: 08 Dec 2018 10:28
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