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Table 3

ATPM derived thermophysical properties of (1620) Geographos using the thermal-infrared observations obtained in 1983 at the 3σ confidence level.

Shape model Radar Flattened-radar Light-curve
Diameter fitting mode Free Fixed Free Fixed Free Fixed

Thermal-infrared reduced-χ2 0.30 2.42 0.23 0.20 0.53 0.50
Light-curve relative-χ2 26.6 26.6 23.3 23.3 11.9 11.9
Effective diametera (km) 2.21 ± 0.13 2.56 ± 0.03 2.42 ± 0.13 2.34 ± 0.03 2.36 ± 0.12 2.46 ± 0.03
Maximum equatorial diametera (km) 4.35 ± 0.26 5.04 ± 0.07 5.21 ± 0.28 5.04 ± 0.07 4.83 ± 0.25 5.04 ± 0.07
Geometric albedoa 0.21 ± 0.04 0.155 ± 0.015 0.17 ± 0.03 0.186 ± 0.019 0.18 ± 0.03 0.168 ± 0.017
Thermal inertiab (J m-2 K-1 s−1/2) 320 1320 340 260 260 340
Roughness fraction (%) 60 ± 26a 60c 64 ± 24a 58 ± 24a 45c 50c

Notes.

(a)

Mean and standard error.

(b)

Median and 1σ spread.

(c)

3σ range.

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