Table 1
Thermal and dynamical parameters for asteroid Didymos.
| Symbol | Name | Nominal value | Units | Naidu et al. (2020) | Rozitis et al. (2024) | Richardson et al. (2024) | Daly et al. (2023) |
|---|---|---|---|---|---|---|---|
| e | Eccentricity | 0.38 | 0.38 | 0.38 | |||
| a | Semimajor axis | 1.643 | au | 1.642 | 1.643 | 1.64 | |
| Γ | Thermal inertia | 320 | J m2 K s−1/2 | 320 ± 70 | |||
| ρ | Bulk density | 2750 | kg m−3 | 2170 ± 350 | 2750 ± 350 | 2790 ± 140 | 2400 ± 300 |
| R | Diameter | 730 | m | 780 ± 30 | 730 ± 17 | 730 ± 17 | 761 ± 26 |
Notes. Absorption coefficient α and emissivity ϵ were set to 0.9. The nominal value of the seasonal thermal parameter Θ defined in Sect. 2 is ≃0.07. “Nominal values” the value we adopted and chosen from the provided references. Since Didymos is top-shaped, the considered diameter is that of a sphere with an equivalent volume. Regarding thermal inertia, other than the one provided in Rozitis et al. (2024), several authors have given recent estimates (see e.g. Rivkin et al. (2023) or Novaković & Fenucci (2024)).
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