66652 Borasisi
| Discovery | |
|---|---|
| Discovered by | A. Trujillo, J. Luu and D. Jewitt |
| Discovery date | 8 September 1999 |
| Designations | |
| MPC designation | (66652) 1999 RZ253 |
| trans-Neptunian object cubewano[1][2] SCATNEAR[3] |
|
| Orbital characteristics[5] | |
| 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) |
| 43.555 AU (6.5157 Tm) | |
| Eccentricity | 0.085781 |
| 287.45 yr (104991 d) | |
| 60.025° | |
| Inclination | 0.56319° |
| 84.722° | |
| 194.98° | |
| Known satellites | Pabu (137 km in diameter?)[4] |
| Earth MOID | 38.8006 AU (5.80449 Tm) |
| Jupiter MOID | 34.5862 AU (5.17402 Tm) |
| Physical characteristics | |
| Dimensions | 163+33 −66 km (combinded) 126+25 −51 km (primary) 105+20 −42 km (secondary)[6] |
| Mass | (3.433±0.027)×1018 kg[7] |
|
Mean density
|
2.1+2.6 −1.2 g/cm3[6] |
|
Sidereal rotation period
|
6.4±1.0 h[6] |
| 0.236+0.438 −0.77[6] |
|
| V−R= 0.646 ± 0.058[6] | |
| 6.121 ± 0.070,[6] 5.9[5] | |
66652 Borasisi /ˌbɒrəˈsiːsi/ is a binary classical Kuiper belt object. It was discovered in 1999 by Chad Trujillo, Jane X. Luu and David C. Jewitt[5] and identified as a binary in 2003 by K. Noll and colleagues[5] using the Hubble Telescope.
Satellite
In 2003 it was discovered that 66652 Borasisi is a binary with the components of comparable size (about 100–130 km) orbiting the barycentre on a moderately elliptical orbit.[6][8] The total system mass is about 3.4 × 1018 kg.[7]
The companion (66652) Borasisi I, named Pabu /ˈpɑːbuː/ orbits its primary in 46.2888 ± 0.0018 days on an orbit with semi-major axis of 4528 ± 12 km and eccentricity 0.4700 ± 0.0018. The orbit is inclined with respect to the observer by about 54° meaning that is about 35° from the pole-on position.[7]
Physical properties
The surface of both components of the Borasisi–Pabu system is very red.[6]
Naming
Borasisi is named after a fictional creation deity taken from the novel Cat's Cradle by Kurt Vonnegut.[9] In the book, Borasisi is the Sun and Pabu is the name of the Moon:[10]
- Borasisi, the sun, held Pabu, the moon, in his arms and hoped that Pabu would bear him a fiery child. But poor Pabu gave birth to children that were cold, that did not burn... Then poor Pabu herself was cast away, and she went to live with her favorite child, which was Earth.
Exploration
Around 2005, Borasisi was considered as a target for the proposed New Horizons 2 after a Triton/Neptune flyby.[11]
References
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (66652) Borasisi = 1999 RZ253 Orbit
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 7.0 7.1 7.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Michael E. Brown, How I Killed Pluto and Why It Had It Coming. ch. 11 "Planet or Not"
- ↑ JPL Small-Body Database Browser
- ↑ Final Report of the New Horizons II Review Panel
External links
- Orbital simulation from JPL (Java)
- Ephemeris
- IAUC 8143
- 66652 Borasisi at the JPL Small-Body Database
