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 Telescope.
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. The total system mass is about 3.4 × 1018 kg.
The companion (66652) Borasisi I, named Pabu, 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.
The surface of both components of the Borasisi–Pabu system is very red.
Borasisi is named after a fictional creation deity taken from the novel Cat's Cradle by Kurt Vonnegut. In the book, Borasisi is the Sun and Pabu is the name of the Moon:
- 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.
Around 2005, Borasisi was considered as a target for the proposed New Horizons 2 after a Triton/Neptune flyby.
- ^ "MPEC 2009-R09 :Distant Minor Planets (2009 SEPT. 16.0 TT)" . IAU Minor Planet Center. 2009-09-04. Retrieved 2009-10-04.
- ^ (66652) Borasisi = 1999 RZ253 Orbit
- ^ Marc W. Buie. "Orbit Fit and Astrometric record for 66652" (using 47 observations, last obs 2012-10-18). SwRI (Space Science Department). Retrieved 2009-10-04.
- ^ Wm. Robert Johnston (2008-11-25). "(66652) Borasisi" . Johnston's Archive. Retrieved 2009-10-06.
- ^ a b c d "JPL Small-Body Database Browser: 66652 Borasisi (1999 RZ253)" . Retrieved 25 March 2016.
- ^ a b c d e f g h
Vilenius, E.; Kiss, C.; Mommert, M.; et al. (2014). ""TNOs are Cool": A survey of the trans-Neptunian region X. Analysis of classical Kuiper belt objects from Herschel and Spitzer observations". Astronomy & Astrophysics. 564: A35. arXiv:1403.6309 . Bibcode:2014A&A...564A..35V . doi:10.1051/0004-6361/201322416 .
- ^ a b c d Grundy, W. M.; Noll, K. S.; Nimmo, F.; Roe, H. G.; Buie, M. W.; Porter, S. B.; Benecchi, S. D.; Stephens, D. C.; Levison, H. F.; Stansberry, J. A. (2011). "Five new and three improved mutual orbits of transneptunian binaries" (pdf). Icarus. 213 (2): 678. arXiv:1103.2751 . Bibcode:2011Icar..213..678G . doi:10.1016/j.icarus.2011.03.012 .
Keith S. Noll; Denise C. Stephens; Will M. Grundy & Ian Griffin (December 2004). "The orbit, mass, and albedo of transneptunian binary (66652) 1999 RZ253". Icarus. 172. arXiv:astro-ph/0406588 . Bibcode:2004Icar..172..402N . doi:10.1016/j.icarus.2004.06.009 .
- ^ 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
Categories: Minor planet object articles (numbered) | Classical Kuiper belt objects | Discoveries by Chad Trujillo | Discoveries by Jane Luu | Discoveries by David C. Jewitt | Named minor planets | Binary trans-Neptunian objects | Astronomical objects discovered in 1999
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