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66652 Borasisi

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Kuiper belt binary

66652 Borasisi
Borasisi and its companion Pabu imaged by theHubble Space Telescope in 2003
Discovery
Discovered byC. Trujillo,J. Luu andD. Jewitt
Discovery date8 September 1999
Designations
(66652) Borasisi
Pronunciation/bɒrəˈsiːsi/
1999 RZ253
trans-Neptunian object
cubewano[1][2]
SCATNEAR(?)[3]
Orbital characteristics[4]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc4790 days (13.11 yr)
Aphelion47.291 AU (7.0746 Tm)
Perihelion39.819 AU (5.9568 Tm)
43.555 AU (6.5157 Tm)
Eccentricity0.085781
287.45yr (104991d)
60.025°
0.0034289°/day
Inclination0.56319°
84.722°
194.98°
KnownsatellitesPabu/ˈpɑːbuː/
(137 km in diameter?)[5]
Physical characteristics
163+33
−66 km (combined)
126+25
−51 km (primary)
105+20
−42 km (secondary)[6]
Mass(3.433±0.027)×1018 kg[7]
2.1+2.6
−1.2 g/cm3[6]
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[4]

66652 Borasisi, or as a binary(66652) Borasisi–Pabu[7] (provisional designation1999 RZ253), is a binaryclassical Kuiper belt object. It was discovered in September 1999 byChad Trujillo,Jane X. Luu andDavid C. Jewitt[4] and identified as abinary on 23 August 2003 by K. Noll and colleagues[4] using theHubble Space Telescope.

Binary

[edit]
Schematic illustration of two bodies with similar mass orbiting around a common barycenter (red cross) with elliptic orbits. Borasisi and Pabu interact similarly.

In 2003 it was discovered that Borasisi is abinary with the components of comparable size (about 100–130 km) orbiting thebarycentre on a moderately elliptical orbit.[6][8] The total system mass is about 3.4 × 1018 kg.[7]

The companion(66652) Borasisi I, namedPabu, orbits its primary in46.2888 ± 0.0018 days on an orbit with asemi-major axis of4528 ± 12 km and aneccentricity0.4700 ± 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

[edit]

The surface of both components of the Borasisi–Pabu system is very red.[6]

Naming

[edit]

Borasisi is named after afictional creation deity taken from the novelCat's Cradle byKurt Vonnegut.[9] In the book, Borasisi is theSun and Pabu is the name of theMoon:[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

[edit]

Around 2005, Borasisi was considered as a target for the proposedNew Horizons 2 after a Triton/Neptune flyby.[11]

References

[edit]
  1. ^"MPEC 2009-R09 :Distant Minor Planets (2009 SEPT. 16.0 TT)".IAU Minor Planet Center. 4 September 2009. Retrieved4 October 2009.
  2. ^(66652) Borasisi = 1999 RZ253
  3. ^Marc W. Buie."Orbit Fit and Astrometric record for 66652" (using 47 observations, last obs 2012-10-18). SwRI (Space Science Department). Retrieved4 October 2009.
  4. ^abcd"JPL Small-Body Database Browser: 66652 Borasisi (1999 RZ253)". Retrieved25 March 2016.
  5. ^Wm. Robert Johnston (25 November 2008)."(66652) Borasisi". Johnston's Archive. Retrieved6 October 2009.
  6. ^abcdefghVilenius, 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.S2CID 118513049.
  7. ^abcdGrundy, 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.S2CID 9571163.
  8. ^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 (2):402–407.arXiv:astro-ph/0406588.Bibcode:2004Icar..172..402N.doi:10.1016/j.icarus.2004.06.009.S2CID 119466664.
  9. ^Michael E. Brown,How I Killed Pluto and Why It Had It Coming. ch. 11 "Planet or Not"
  10. ^JPL Small-Body Database Browser
  11. ^Final Report of the New Horizons II Review Panel

External links

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