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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 |
|
|
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| 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 |
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