66652 Borasisi
66652 Borasisi, or as a binary (66652) Borasisi-Pabu, is a binary classical Kuiper belt object. It was discovered in September 1999 by Chad Trujillo, Jane X. Luu and David C. Jewitt and identified as a binary in 2003 by K. Noll and colleagues using the Hubble Space Telescope.
Borasisi and its companion Pabu imaged by the Hubble Space Telescope in 2003 | |
| Discovery | |
|---|---|
| Discovered by | A. Trujillo, J. Luu and D. Jewitt |
| Discovery date | 8 September 1999 |
| Designations | |
MPC designation | (66652) Borasisi |
| Pronunciation | /bɒrəˈsiːsi/ |
Alternative designations | 1999 RZ253 |
Minor planet category | trans-Neptunian object cubewano SCATNEAR(?) |
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 3 | |
| Observation arc | 4790 days (13.11 yr) |
| Aphelion | 47.291 AU (7.0746 Tm) |
| Perihelion | 39.819 AU (5.9568 Tm) |
Semi-major axis | 43.555 AU (6.5157 Tm) |
| Eccentricity | 0.085781 |
Orbital period (sidereal) | 287.45 yr (104991 d) |
Mean anomaly | 60.025° |
Mean motion | 0.0034289°/day |
| Inclination | 0.56319° |
Longitude of ascending node | 84.722° |
| 194.98° | |
| Known satellites | Pabu /ˈpɑːbuː/ (137 km in diameter?) |
| Physical characteristics | |
Mean diameter | 163+33 −66 km (combined) 126+25 −51 km (primary) 105+20 −42 km (secondary) |
| Mass | (3.433±0.027)×1018 kg |
Mean density | 2.1+2.6 −1.2 g/cm3 |
Synodic rotation period | 6.4±1.0 h |
| 0.236+0.438 −0.77 | |
| V−R= 0.646 ± 0.058 | |
| 6.121 ± 0.070, 5.9 | |
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