2001 XR254

2001 XR254
Discovery[1]
Discovered by David C. Jewitt, Scott S. Sheppard and J. Kleyna
Discovery date 10 December 2001
Designations
MPC designation 2001 XR254
TNO · cubewano [2][1]
(cold)[3]
Orbital characteristics[4]
Epoch 13 January 2013 (JD 2454100.5)
Aphelion 44.499 AU
Perihelion 41.769 AU
43.134 AU
Eccentricity 0.032
283.30 a
232.172°
Inclination 1.232°
179.933°
68.598°
Known satellites 1 (D: 140 km; P: 125.58 d)[5]
Physical characteristics
Dimensions 221+41
−71 km (combined)
171+32
−55 km (primary)
140+26
−45 km (satellite)[6]
Mass (4.055±0.065)×1018 kg[6]
Mean density
 1.00+0.96
−0.56 g/cm3[6][lower-alpha 1]
Albedo 0.136+0.168
−0.044[6]
Spectral type
 V−I=1.06 ± 0.12[5]
6.05 ± 0.15[7]

    2001 XR254 is a trans-Neptunian object and binary system from the "cold" cubewano population of the classical Kuiper Belt, located in the outer Solar System.[6]

    Discovery and orbit

    2001 XR254 was discovered on 10 December 2001 by David C. Jewitt, Scott S. Sheppard and Jan Kleyna using 2.2-m University of Hawaii reflector on Mauna Kea.[1][5] 2001 XR254 belongs to the dynamically cold population of the classical Kuiper belt objects, which small orbital eccentricities and inclinations. Their semi-major axes reside mainly in the interval 40–45 AU.[6]

    Satellite

    2001 XR254 is a binary consisting of two components of approximately equal size. Assuming that both components have the same albedo, the primary is estimated to be about 170 km in diameter. The size of the secondary (satellite) in this case is estimated at about 140 km. The total mass of the system is about 4×1018 kg. The average density of both components is about 1 g/cm3.[6]

    Orbital parameters of the 2001 XR254 system[8][9]
    Semi-major axis (km) Eccentricity Period (d) Inclination (°)
    9310 ± 49 0.5561 ± 0.0046 125.579 ± 0.049 41.07 ± 0.22

    Physical properties

    The surfaces of both components of 2001 XR254 appear to have a neutral color.[7]

    Notes

    1. ↑ Assuming that both components have equal albedos and equal densities

    References

    1. 1 2 3 Marsden, Brian G. (2002-11-01). "MPEC 2002-V07 : 2001 XR254, 2001 XS254, 2001 XU254". IAU Minor Planet Center. Harvard-Smithsonian Center for Astrophysics. Retrieved 2016-03-08.
    2. ↑ Marc W. Buie. "Orbit Fit and Astrometric record for 01XR254". SwRI (Space Science Department). Retrieved 2018-02-17.
    3. ↑ Mike Brown's "How many dwarf planets are there in the outer solar system?" "Archived copy". Archived from the original on 15 October 2013. Retrieved 18 February 2018.
    4. ↑ "JPL Small-Body Database Browser: (2001 XR254)" (2009-02-26 last obs). Retrieved 2016-03-08.
    5. 1 2 3 Wm. Robert Johnston (23 June 2015). "2001 XR254". Johnston's Archive. Retrieved 2016-03-09.
    6. 1 2 3 4 5 6 7 Vilenius, E.; Kiss, C.; Mommert, M.; et al. (2014). ""TNOs are Cool": A survey of the trans-Neptunian region X. Analysis of classical Kuiper belt objects from Herschel and Spitzer observations". Astronomy & Astrophysics. 564: A35. arXiv:1403.6309. Bibcode:2012A&A...541A..94V. doi:10.1051/0004-6361/201322416.
    7. 1 2 Vilenius, E.; Kiss, C.; Mommert, M.; et al. (2014). ""TNOs are Cool": A survey of the trans-Neptunian region VI. Herschel>/PACS observations and thermal modeling of 19 classical Kuiper belt objects". Astronomy & Astrophysics. 541: A94. arXiv:1204.0697. Bibcode:2012A&A...541A..94V. doi:10.1051/0004-6361/201118743.
    8. ↑ Grundy, W. M.; Noll, K. S.; Buie, M.W; Benecchi, S.D.; . Stephens, D.C.; Levison, H.F (2009). "Mutual orbits and masses of six transneptunian binaries". Icarus. 200: 627–635. arXiv:0812.3126. Bibcode:2009Icar..200..627G. doi:10.1016/j.icarus.2008.12.008.
    9. ↑ Grundy, W. M.; Noll, K. S.; Nimmo, F.; Roe, H. G.; Buie, M. W.; Porter, S. B.; Benecchi, S. D.; Stephens, D. C.; Levison, H. F.; Stansberry, J. A. (2011). "Five new and three improved mutual orbits of transneptunian binaries" (pdf). Icarus. 213 (2): 678. arXiv:1103.2751. Bibcode:2011Icar..213..678G. doi:10.1016/j.icarus.2011.03.012.

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