Open Access
Table 5
Orbital and physical parameters of asteroid (101955) Bennu.
| Parameter | Value | Reference |
|---|---|---|
| Semimajor axis, a | 1.1259963567892803 ± 1.718E−10 au | NEOCC - Epoch 60000.0000 MJD |
| Eccentricity, e | 0.203719194929926 ± 2.045E-8 | NEOCC - Epoch 60000.0000 MJD |
| Semimajor axis drift, da/dt | −284 ± 0.2 m yr−1 | Farnocchia et al. (2021) |
| Absolute magnitude, H | 20.21 ± 0.03 | Hergenrother et al. (2019) |
| Radius, r | 242.22 ± 0.15 m | Daly et al. (2020) |
| Bulk density, ρ | 1194 ± 3kgm−3 | Daly et al. (2020) |
| Obliquity, γ | 177.6 ± 0.11 degrees | Lauretta et al. (2019) |
| Rotation period, P | 4.2960015 ± 0.0000018 h | Daly et al. (2020) |
| Albedo, pV | 0.044 ± 0.002 | Lauretta et al. (2019) |
| Emissivity, ϵ | 0.984 | |
| Thermal inertia, Γ | 310 ± 70 J m−2 K−1 s−1/2 | Emery et al. (2014) |
| Thermal inertia, Γ | 350 ± 20 J m−2 K−1 s−1/2 | Dellagiustina et al. (2019) |
| Thermal inertia, Γ | 300 ± 30 J m−2 K−1 s−1/2 | Rozitis et al. (2020, OTES) |
| Thermal inertia, Γ | 320 ± 30 J m−2 K−1 s−1/2 | Rozitis et al. (2020, OVIRS) |
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