Table 5
Orbital elements and physical parameters for the Orcus/Vanth system.
| Qty. | Value | Uncert. | Description | ||
|
|
|||||
| a | 9030 | 89 | km | Semi-major axis | |
| e | 0.007 | 0.003 | – | Eccentricity | |
| i | (± )21 | 2 | deg. | Inclination1 | |
| Ω | 144 | 63 | deg. | Ascending node1 | |
| n | 37.732 | 0.002 | deg/day | Mean motion | |
|
|
|||||
| P | 9.5406 | 0.0004 | day | Orbital period | |
| P A | (321, –2) | 3 | deg. | Pole A coordinates2 | |
| P B | (340, +38) | 3 | deg. | Pole B coordinates2 | |
|
|
|||||
| ℳ | 641 | 19 | 1018 kg | Total mass | |
|
850 | 90 | km | Diameter3 | |
| D o | 807 or 761 | 100 | km | Orcus diameter4 | |
| D v | 267 or 378 | 100 | km | Vanth diameter4 | |
| ρ | 2250 or 2470 | 885 | kg m-3 | Bulk density | |
Notes. Uncertainties are the formal 1σ confidence intervals (from Fig. 6) and do not account for possible systematics (that arise from model incompleteness, e.g., neglecting Orcus J2 which is unknown).
Volume-equivalent from radiometry (see Lim et al. 2010).
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