(229762) 2007 UK126

(229762) 2007 UK126
(229762) 2007 UK126 and its satellite, imaged by the Hubble Space Telescope on 2 January 2018.
Discovery[1]
Discovered by M. E. Schwamb
M. E. Brown
D. L. Rabinowitz
Discovery date 19 October 2007
Designations
MPC designation (229762) 2007 UK126
Scat-ext[2][3]
Orbital characteristics[4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 2
Observation arc 12,629 days (34.58 yr)
Earliest precovery date 16 August 1982
Aphelion 108.2806 AU (16.19855 Tm)
Perihelion 37.4740 AU (5.60603 Tm)
72.8773 AU (10.90229 Tm)
Eccentricity 0.48579
622.15 yr (227,241 d)
343.6090°
0° 0m 5.703s / day
Inclination 23.3648°
131.1567°
346.9215°
Known satellites 1[5][6]
Physical characteristics
Dimensions

599–629 km[7]

648+60
−46 km[8]
599±77 km[6]
612 km[9]
Mean density
 <1.74 g/cm3[8]
>8 h, presumably 11.05 h[10]

0.15±0.016[7]

0.167+0.058
−0.038[6]
Temperature 50–55 K max.[7]
20.8[1]
3.69±0.10[6]
3.5[4]

    (229762) 2007 UK126, also written as (229762) 2007 UK126, is a scattered disc object (SDO) with a bright absolute magnitude of 3.7.[6] 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.[4]

    It has been observed 171 times over 15 oppositions with precovery images back to 1982.[4]

    Satellite

    It has been reported that (229762) 2007 UK126 has a satellite, but a mass estimate has not been made.[6] 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.[5]

    See also

    References

    1. 1 2 "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). Retrieved 2012-05-07.
    3. ↑ "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 2012-05-07.
    4. 1 2 3 4 "JPL Small-Body Database Browser: 229762 (2007 UK126)" (2017-03-14 last obs and observation arc=34.58 years). Retrieved 19 July 2018.
    5. 1 2 (229762) 2007 UK126, Johnston's Archive. Last updated 20 September 2014
    6. 1 2 3 4 5 6 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.
    7. 1 2 3 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.
    8. 1 2 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)" Archived October 18, 2011, at the Wayback Machine.
    10. 1 2 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.
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