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. Bibcode: 2008MPEC....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. Bibcode: 2012A&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. Bibcode: 2017A&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. Bibcode: 2014A&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




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