(229762) 2007 UK126

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(229762) 2007 UK126
2007 UK126 Hubble.png
(229762) 2007 UK126 and its satellite, imaged by the Hubble Space Telescope on 2 January 2018.
Discovered byM. E. Schwamb
M. E. Brown
D. L. Rabinowitz
Discovery date19 October 2007
MPC designation(229762) 2007 UK126
Orbital characteristics[5]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 2
Observation arc12,629 days (34.58 yr)
Earliest precovery date16 August 1982
Aphelion108.2806 AU (16.19855 Tm)
Perihelion37.4740 AU (5.60603 Tm)
72.8773 AU (10.90229 Tm)
622.15 yr (227,241 d)
0° 0m 5.703s / day
Known satellites1[9][3]
Physical characteristics
Dimensions599–629 km[1]
599±77 km[3]
612 km[4]
Mean density
<1.74 g/cm3[2]
>8 h, presumably 11.05 h[10]
Temperature50–55 K max.[1]

(229762) 2007 UK126, also written as (229762) 2007 UK126, is a scattered disc object (SDO) with a bright absolute magnitude of 3.7.[3] This makes it probably a dwarf planet. As of June 2018, Mike Brown lists it as highly likely a dwarf planet.[11] Its light-curve amplitude is estimated to be Δm = 0.03 ± 0.01 mag.[10]

Its orbital eccentricity of 0.49 suggests that it was gravitationally scattered onto its eccentric orbit. It will come to perihelion in July 2046.[5]

It has been observed 171 times over 15 oppositions with precovery images back to 1982.[5]


It has been reported that (229762) 2007 UK126 has a satellite, but a mass estimate has not been made.[3] The magnitude difference between the primary and the satellite is 3.79 mag. The satellite has a tentative diameter of 103 km, a semi-major axis of 3600±1300 km, and an estimated orbital period of 5.9 d.[9]

See also[edit]


  1. ^ a b c Schindler, K.; Wolf, J.; Bardecker, J.; Olsen, A.; Müller, T.; Kiss, C.; Ortiz, J. L.; Braga-Ribas, F.; Camargo, J. I. B. (2017). "Results from a triple chord stellar occultation and far-infrared photometry of the trans-Neptunian object (229762) 2007 UK126". Astronomy & Astrophysics. 600: A12. arXiv:1611.02798. Bibcode:2017A&A...600A..12S. doi:10.1051/0004-6361/201628620.
  2. ^ a b Results from the 2014 November 15th multi-chord stellar occultation by the TNO (229762) 2007 UK126, 2016.
  3. ^ a b c d e f Santos-Sanz, P.; Lellouch, E.; Fornasier, S.; Kiss, C.; Pal, A.; Müller, T. G.; Vilenius, E.; Stansberry, J.; Mommert, M.; Delsanti, A.; Mueller, M.; Peixinho, N.; Henry, F.; Ortiz, J. L.; Thirouin, A.; Protopapa, S.; Duffard, R.; Szalai, N.; Lim, T.; Ejeta, C.; Hartogh, P.; Harris, A. W.; Rengel, M. (2012). ""TNOs are Cool": A survey of the trans-Neptunian region IV. Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel-PACS". Astronomy & Astrophysics. 541: A92. arXiv:1202.1481. Bibcode:2012A&A...541A..92S. doi:10.1051/0004-6361/201118541.
  4. ^ Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)" Archived October 18, 2011, at the Wayback Machine.
  5. ^ a b c d "JPL Small-Body Database Browser: 229762 (2007 UK126)" (2017-03-14 last obs and observation arc=34.58 years). Retrieved 19 July 2018.
  6. ^ a b "2007 UK126". Minor Planet Electronic Circular: D38. 2008. Bibcode:2008MPEC....D...38S.
  7. ^ Marc W. Buie (2012-05-08). "Orbit Fit and Astrometric record for 229762". SwRI (Space Science Department). Retrieved 2012-05-07.
  8. ^ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2012-05-07.
  9. ^ a b (229762) 2007 UK126, Johnston's Archive. Last updated 20 September 2014
  10. ^ a b Thirouin, A.; Noll, K. S.; Ortiz, J. L.; Morales, N. (2014-09-01). "Rotational properties of the binary and non-binary populations in the trans-Neptunian belt". Astronomy & Astrophysics. 569: A3. arXiv:1407.1214. Bibcode:2014A&A...569A...3T. doi:10.1051/0004-6361/201423567.
  11. ^ Michael E. Brown (June 12, 2018). "How many dwarf planets are there in the outer solar system? (updates daily)". California Institute of Technology. Archived from the original on 2018-06-15. Retrieved 2018-07-19.

External links[edit]