Journal Article

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

Stephen D. Wolters, Ben Rozitis, Samuel R. Duddy, Stephen C. Lowry, Simon F. Green, Colin Snodgrass, Olivier R. Hainaut and Paul Weissman

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 418, issue 2, pages 1246-1257
Published in print December 2011 | ISSN: 0035-8711
Published online November 2011 | e-ISSN: 1365-2966 | DOI:
Physical characterization of low delta-V asteroid (175706) 1996 FG3*

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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.

Keywords: radiation mechanisms: thermal; minor planets, asteroids: individual: (175706)1996FG3; infrared: general

Journal Article.  6884 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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