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(523794) 2015 RR245

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2015 RR245
Orbit of 2015 RR245
Designations
2015 RR245
Orbital characteristics
Epoch 2016 July 31.0 TT = JDT 2457600.5
Aphelion128.8650253 AU (Q)
Perihelion33.7133696 AU (q)
81.2891975 AU (a)
Eccentricity0.5852663 (e)
733 yr
322.50413° (M)
Inclination7.57643° (i)
211.67680° (Ω)
261.41753° (ω)
Physical characteristics
Dimensions670 km (420 mi) diameter
Mass2,374 km (1,475 mi)
0.12?

2015 RR245 is a possible dwarf planet in the Kuiper belt. 2015 RR245 is one of the few dwarf planets to survive after the formation of the solar system, along with Pluto and Eris.[1] It was discovered in February 2016[2][3] by the Outer Solar System Origins Survey (OSSOS).[2][3]

2015 RR245 was discovered by a research team while poring over images that the Canada–France–Hawaii Telescope in Hawaii took in September 2015 as part of the OSSOS (Outer Solar System Origins Survey).[2][3]

Its exact size is uncertain, but the best estimate is around 670 km (420 mi) in diameter, assuming an albedo of 12%. For comparison, Pluto, the largest object in the Kuiper belt, is about 2,374 km (1,475 mi) in diameter.[2][3]

Orbit

As of July 2016, the orbit of 2015 RR245 is approximately, but not precisely known. It has a 700-year orbit. It appears to come as close as 33.7 AU[4] to the Sun (still beyond the orbit of Neptune at 30 AU), and up to 129 AU distant.[5] It will make its closest approach to the Sun in 2096.[2]

Resonance with Neptune

2015 RR2015's orbit librating in a 2:9 resonance with Neptune

Additional precovery astrometry from the Pan-STARRS1 survey shows that 2015 RR245 is securely trapped in a 2:9 mean motion resonance with Neptune, meaning that 2015 RR245 orbits the Sun twice in the same amount of time it takes Neptune to complete 9 orbits.[6]

See also

References

  1. ^ "New Distant Dwarf Planet Beyond Neptune". United Press International. 18 July 2016. Retrieved 9 October 2016 – via Gale General OneFile.
  2. ^ a b c d e "New Dwarf Planet Discovered Far Beyond Pluto's Orbit". space.com. 11 July 2016.
  3. ^ a b c d Chang, Kenneth (13 July 2016). "Astronomers Discover New Likely Dwarf Planet, the Latest of Many". New York Times. Retrieved 14 July 2016.
  4. ^ "New Dwarf Planet".
  5. ^ "Kuiper Belt's Big, New, Far-Out Object - Sky & Telescope". 13 July 2016.
  6. ^ Bannister, Michele T.; Alexandersen, Mike; Benecchi, Susan D.; Chen, Ying-Tung; Delsanti, Audrey; Fraser, Wesley C.; Gladman, Brett J.; Granvik, Mikael; Grundy, Will M.; Guilbert-Lepoutre, Aurelie; Gwyn, Stephen D. J.; Ip, Wing-Huen; Jakubik, Marian; Lynne Jones, R.; Kaib, Nathan; Kavelaars, J. J.; Lacerda, Pedro; Lawler, Samantha; Lehner, Matthew J.; Hsing Wen Lin; Patryk Sofia Lykawka; Marsset, Michael; Murray-Clay, Ruth; Noll, Keith S.; Parker, Alex; Petit, Jean-Marc; Pike, Rosemary E.; Rousselot, Philippe; Schwamb, Megan E.; et al. (2016). "OSSOS: IV. Discovery of a dwarf planet candidate in the 9:2 resonance". arXiv:1607.06970v1 [astro-ph.EP].



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