Astronomy:(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.
Discovery[1]
Discovered byM. E. Schwamb
M. E. Brown
D. L. Rabinowitz
Discovery date19 October 2007
Designations
(229762) 2007 UK126
Minor planet categoryScat-ext[2][3]
Orbital characteristics[6]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 2
Observation arc12,629 days (34.58 yr)
Earliest precovery date16 August 1982
|{{{apsis}}}|helion}}108.2806 astronomical unit|AU (16.19855 Tm)
|{{{apsis}}}|helion}}37.4740 AU (5.60603 Tm)
72.8773 AU (10.90229 Tm)
Eccentricity0.48579
Orbital period622.15 yr (227,241 d)
Mean anomaly343.6090°
Mean motion0° 0m 5.703s / day
Inclination23.3648°
Longitude of ascending node131.1567°
346.9215°
Known satellites1[4][5]
Physical characteristics
Dimensions599–629 km[7]
648+60
−46
 km
[8]
599±77 km[5]
612 km[9]
Mean density<1.74 g/cm3[8]
Rotation period>8 h, presumably 11.05 h[10]
Geometric albedo0.15±0.016[7]
0.167+0.058
−0.038
[5]
Physics50–55 K max.[7]
Apparent magnitude20.8[1]
Absolute magnitude (H)3.69±0.10[5]
3.5[6]


(229762) 2007 UK126, also written as (229762) 2007 UK126, is a scattered disc object (SDO) with a bright absolute magnitude of 3.7.[5] 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.[6]

It has been observed 171 times over 15 oppositions with precovery images back to 1982.[6]

Satellite

It has been reported that (229762) 2007 UK126 has a satellite, but a mass estimate has not been made.[5] 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.[4]

See also

References

  1. 1.0 1.1 "2007 UK126". Minor Planet Electronic Circular: D38. 2008. Bibcode2008MPEC....D...38S. 
  2. Marc W. Buie (2012-05-08). "Orbit Fit and Astrometric record for 229762". SwRI (Space Science Department). http://www.boulder.swri.edu/~buie/kbo/astrom/229762.html. Retrieved 2012-05-07. 
  3. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. http://www.minorplanetcenter.org/iau/lists/Centaurs.html. Retrieved 2012-05-07. 
  4. 4.0 4.1 (229762) 2007 UK126, Johnston's Archive. Last updated 20 September 2014
  5. 5.0 5.1 5.2 5.3 5.4 5.5 Santos-Sanz, P.; Lellouch, E.; Fornasier, S.; Kiss, C.; Pal, A.; Müller, T. G.; Vilenius, E.; Stansberry, J. et al. (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. doi:10.1051/0004-6361/201118541. Bibcode2012A&A...541A..92S. 
  6. 6.0 6.1 6.2 6.3 "JPL Small-Body Database Browser: 229762 (2007 UK126)". http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=229762. Retrieved 19 July 2018. 
  7. 7.0 7.1 7.2 Schindler, K.; Wolf, J.; Bardecker, J.; Olsen, A.; Müller, T.; Kiss, C.; Ortiz, J. L.; Braga-Ribas, F. et al. (2017). "Results from a triple chord stellar occultation and far-infrared photometry of the trans-Neptunian object (229762) 2007 UK126" (in en). Astronomy & Astrophysics 600: A12. doi:10.1051/0004-6361/201628620. Bibcode2017A&A...600A..12S. https://doi.org/10.1051/0004-6361/201628620. 
  8. 8.0 8.1 Results from the 2014 November 15th multi-chord stellar occultation by the TNO (229762) 2007 UK126, 2016.
  9. Michael E. Brown. "How many dwarf planets are there in the outer solar system? (updates daily)"
  10. 10.0 10.1 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" (in en). Astronomy & Astrophysics 569: A3. doi:10.1051/0004-6361/201423567. Bibcode2014A&A...569A...3T. https://doi.org/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. https://web.archive.org/web/20180615191556/http://web.gps.caltech.edu/~mbrown/dps.html. Retrieved 2018-07-19. 

External links