65489 Ceto
65489 Ceto, as a binary also (65489) Ceto/Phorcys, is a binary trans-Neptunian object (TNO) discovered on March 22, 2003, by Chad A. Trujillo and Michael Brown at Palomar. It is named after the sea goddess Ceto from Greek mythology. It came to perihelion in 1989.
Hubble Space Telescope image of Ceto and Phorcys, taken in 2006 | |
| Discovery | |
|---|---|
| Discovered by | C. A. Trujillo and M. Brown |
| Discovery site | Palomar |
| Discovery date | 22 March 2003 |
| Designations | |
MPC designation | (65489) Ceto |
| Pronunciation | /ˈsiːtoʊ/ |
Named after | Ceto |
Alternative designations | 2003 FX128 |
Minor planet category | TNO Centaur–extended |
| Adjectives | Cetoan /siːˈtoʊən/ or Cetoian /siːˈtoʊ.iən/ |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 9239 days (25.30 yr) |
| Aphelion | 187.74 AU (28.086 Tm) |
| Perihelion | 17.8498 AU (2.67029 Tm) |
Semi-major axis | 102.79 AU (15.377 Tm) |
| Eccentricity | 0.82635 |
Orbital period (sidereal) | 1042.22 yr (380669.7 d) |
Mean anomaly | 9.1219° |
Mean motion | 0.00094570°/day |
| Inclination | 22.266° |
Longitude of ascending node | 171.85° |
| 320.086° | |
| Known satellites | Phorcys /ˈfɔːrsɪs/ (171±10 ~ 132+6 −14 km in diameter) |
| Earth MOID | 16.895 AU (2.5275 Tm) |
| Jupiter MOID | 12.7433 AU (1.90637 Tm) |
| Physical characteristics | |
| Dimensions | 223±10 km 174+16 −18 km |
| Mass | (5.4±0.4)×1018 kg (system) |
Mean density | 1.37 g/cm3 (system) |
Equatorial surface gravity | 3.3 cm/s2 |
Synodic rotation period | 4.43 h (0.185 d) |
| 0.056±0.006 0.084±0.02 | |
| 6.54±0.06, 6.4 | |
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