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Table 4
Mass and spin change properties of (1620) Geographos derived by ATPM at the 3σ confidence level.
| Shape model | Radar | Flattened-radar | Light-curve | |||
| Diameter fitting mode | Free | Fixed | Free | Fixed | Free | Fixed |
|
|
||||||
| Bulk densitya (kg m-3) | 2400  |
1450  |
2050  |
2150  |
2150  |
2100 |
| Macro-porositya (%) | 28  |
56  |
38  |
35  |
35  |
37  |
| Massa (1013 kg) | 1.38  |
1.25  |
1.54  |
1.49  |
1.48  |
1.62  |
| Moment of inertiaa (1019 kg m2) | 1.42  |
1.67  |
2.27  |
2.03  |
1.91  |
2.21  |
| YORP rotational accelerationa (10-3 rad yr-2) | -4.8  |
-5.5  |
-4.1  |
-4.2 |
2.0  |
1.9  |
| YORP obliquity shifta (°/105 yr) | 2.6  |
1.0 ± 0.4 | 3.6  |
4.2  |
2.5  |
2.3 ± 0.6 |
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