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- W2950357079 abstract "Asteroid (175706) 1996 FG3 is a binary asteroid and the baseline target for the proposed MarcoPolo-R sample-return mission. We present thermal IR photometry obtained with the ESO VLT+VISIR together with optical photometry obtained with the ESO NTT+EFOSC2 . An absolute visual magnitude H_V = 17.833 pm 0.024 and phase parameter G = -0.041 pm 0.005 is derived. The Near-Earth Asteroid Thermal Model (NEATM) has been fitted to the measured fluxes to derive a geometric visual albedo p_v = 0.046 pm 0.014, effective diameter at the observed aspect D_eff = 1.68 pm 0.25 km, and beaming parameter {eta} = 1.15 for phase angle {alpha} = 11.7{deg}. The Advanced Thermophysical Model (ATPM) has been fitted to the measured fluxes to derive a more accurate effective diameter D_eff = 1.71 pm 0.07 km and albedo p_v = 0.044 pm 0.004. Based on the ATPM results, assuming the same albedo for primary and secondary, we derive a primary mean spherical diameter D_p = (1.69 +0.18/-0.12) km, secondary diameter D_s = 0.51 pm 0.03 km, and a secondary orbital semi-major axis a = (2.8 +1.7/-0.7) km. A low surface thermal inertia {Gamma} = 120 pm 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 semi-major axis of (-60 +31/-45) m yr-1." @default.
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- W2950357079 date "2011-08-08" @default.
- W2950357079 modified "2023-09-27" @default.
- W2950357079 title "Physical characterisation of low delta-V asteroid (175706) 1996 FG3" @default.
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