Dwarf Planet
Quaoar
A classical Kuiper Belt object on a nearly circular orbit. Its two rings lie far outside the Roche limit, at an unexpected distance that challenged theories of ring formation.
| Type | Dwarf Planet |
|---|---|
| Parent body | Sun |
| Radius | 545 km · 0.0855 R⊕ |
| Mass | 1.200 × 10²¹ kg · 2.01 × 10⁻⁴ M⊕ |
| Mean density | 1.77 g/cm³ |
| Surface gravity | 0.27 m/s² · 0.027 × Earth |
| Escape velocity | 0.542 km/s |
| Rotation period | 17.7 hours |
| Orbital radius | 43.7 AU (Sun) |
| Eccentricity | 0.039 |
| Orbital period | 289 years |
| Discovery | 2002, Trujillo & Brown |
| Moon | Weywot |
| Rings | 2 (2023) |