Wolters, Stephen D.; Rozitis, Ben; Duddy, Samuel R.; Lowry, Stephen C.; Green, Simon F.; Snodgrass, Colin; Hainaut, Olivier R. and Weissman, Paul
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 ,i>η</i> = 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.
||2011 The Authors, 2011 RAS, Monthly Notices of the Royal Astronomical Society
|Project Funding Details:
|Funded Project Name||Project ID||Funding Body|
|Not Set||Not Set||UK Science and Technology Facilities Council|
|Not Set||Not Set||European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 268421.|
||radiation mechanisms - thermal; minor planets, asteroids -individual - (175706)1996FG3; infrared - general.
||Science > Physical Sciences
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|Interdisciplinary Research Centre:
||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
||05 Jan 2012 12:10
||27 Oct 2012 00:06
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