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Table 1.
Characteristics of the Didymos and Dinkinesh binary systems with 1σ uncertanties.
| Parameter | Didymos (a) | Dinkinesh (b) |
|---|---|---|
| Volume-equivalent diameter of primary [m] | 730 ± 17 | 719 ± 24 |
| Volume-equivalent diameter of secondary [m] | 150.0 ± 2.5 | 282 ± 28 |
| Bulk density of primary, secondary [kg m−3] | 2790 ± 140, 2400 ± 300 | 2400 ± 350 |
| Semi-major axis [m] | 1189 ± 17 | 3110 ± 50 |
| Secondary shape | Oblate ellipsoid | Bilobate |
| Mutual orbital period [h] | 11.921493 ± 0.000016 | 52.67 ± 0.04 |
| Mutual orbital eccentricity | < 0.03 | 0 |
| Primary rotation period [h] | 2.2600 ± 0.0001 | 3.7387 ± 0.0013 |
| Heliocentric semi-major axis [AU] | 1.64266506 (c) | 2.1915426 (c) |
| Heliocentric eccentricity | 0.383264789 (c) | 0.1121065 (c) |
Notes. The semi-major axis is the orbital semi-major axis rather than a semi-axis of an ellipsoid shape model.
(a)
Appendix of Chabot et al. (2024),
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