Physical characterisation of near-Earth asteroid (1620) Geographos - Reconciling radar and thermal-infrared observations

B. Rozitis; S. F. Green

doi:10.1051/0004-6361/201323090

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Volume 568 (August 2014)

A&A, 568 (2014) A43

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Table 2

Assumed and previously measured thermophysical modelling parameters for thermal-infrared flux fitting and Yarkovsky and YORP effect modelling.

Shape model	Radar	Flattened-radar	Light-curve

Number of vertices	2048^a	2048^a	1022^b
Number of facets	4092^a	4092^a	2040^b
Axis ratios (a:b:c)	2.51:1.00:1.07^a	3.07:1.22:1.00	3.08:1.22:1.00^b
Rotation period^b	5.223336 h	5.223336 h	5.223336 h
YORP rotational acceleration^b	(1.5 ± 0.2) × 10^-3 rad yr^-2	(1.5 ± 0.2) × 10^-3 rad yr^-2	(1.5 ± 0.2) × 10^-3 rad yr^-2
Pole orientation	λ^a = 55°, β^a = –46°	λ^a = 55°, β^a = –46°	λ^b = 58°, β^b = –49°
Obliquity	149°	149°	152°
Semimajor axis^c	1.246 AU	1.246 AU	1.246 AU
Eccentricity^c	0.336	0.336	0.336
Yarkovsky semimajor axis drift^d	–27.4 ± 5.7 m yr^-1	–27.4 ± 5.7 m yr^-1	–27.4 ± 5.7 m yr^-1
Absolute magnitude^e	15.6 ± 0.1	15.6 ± 0.1	15.6 ± 0.1
Phase parameter^e	0.15	0.15	0.15
Emissivity	0.9	0.9	0.9

Notes. Obtained from

^(a)

Hudson & Ostro (1999);

^(b)

Ďurech et al. (2008b);

^(c)

the JPL Small-Body Database Browser;

^(d)

Chesley et al. (2008), Nugent et al. (2012); and Farnocchia et al. (2013);

^(e)

Magnusson et al. (1996).

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