(468861) 2013 LU28

(468861) 2013 LU28, provisional designation 2013 LU28 is a highly eccentric trans-Neptunian object, retrograde centaur and damocloid from the outer regions of the Solar System. It was discovered on 8 June 2013 by astronomers with the Mount Lemmon Survey at the Mount Lemmon Observatory in Arizona, United States.[1] The object is unlikely a dwarf planet as it measures approximately 110 kilometers (68 miles) in diameter.[4][6] It was numbered in 2016 and has not been named since.

(468861) 2013 LU28
Discovery[1]
Discovered byMount Lemmon Srvy.
Discovery siteMount Lemon Obs.
Discovery date8 June 2013
Designations
(468861) 2013 LU28
2013 LU28 · 2014 LJ9
2015 KB157
TNO[2] · centaur[3][4][5]
damocloid · distant[1]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 2
Observation arc4.94 yr (1,805 d)
Aphelion353.12 AU
Perihelion8.7303 AU
180.92 AU
Eccentricity0.9517
2433.62 yr
359.24°
0° 0m 1.44s / day
Inclination125.35°
275.97°
153.09°
TJupiter−2.0650
Physical characteristics
Mean diameter
106 km (est.)[4]
114 km (est.)[6]
0.08 (est.)[6]
0.09 (est.)[4]
8.1[1][2][6]

    Orbit and classification

    2013 LU28 orbits the Sun at a distance of 8.7–353.1 AU once every 2434 years (888,879 days; semi-major axis of 180.92 AU). Its orbit has an exceptionally high eccentricity of 0.95 and an inclination of 125° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation at Mount Lemmon in June 2013.[1]

    TNO, centaur and damocloid

    With a semi-major axis larger than that of Neptune, 2013 LU28 is generically classified as a trans-Neptunian object.[2] It is also considered an (extended) centaur, due to its eccentric orbit with a low perihelion of 8.7 AU and a higher-than-90°-inclination, which gives it a retrograde orbit.[3][4] There are only about a hundred known retrograde minor planets out of nearly 800,000 observed bodies, and, together with 2008 YB3 and 2011 MM4, it is among the largest such objects.[3] 2013 LU28 also meets the orbital definition for being a damocloid, a cometary-like object without a coma or tail and a Tisserand's parameter with respect to Jupiter of less than 2 besides a retrograde orbit.

    Numbering and naming

    This distant minor planet was numbered by the Minor Planet Center on 20 June 2016 (M.P.C. 100585).[7] As of 2018, it has not been named.[1]

    Physical characteristics

    Diameter and albedo

    According to the Johnston's archive and astronomer Michael Brown, 2013 LU28 measures 106 and 114 kilometers in diameter, based on an absolute magnitude of 8.1 and an assumed albedo for the body's surface of 0.08 and 0.09, respectively.[4][6] According to Brown, 2013 LU28 is "probably not" a dwarf planet.[6] As of 2018, no physical characteristics have been determined from photometric observations. The body's rotation period, pole and shape remain unknown.[2][8]

    References
    1. "468861 (2013 LU28)". Minor Planet Center. Retrieved 17 October 2018.
    2. "JPL Small-Body Database Browser: 468861 (2013 LU28)" (2018-05-18 last obs.). Jet Propulsion Laboratory. Retrieved 17 October 2018.
    3. de la Fuente Marcos, C.; de la Fuente Marcos, R. (August 2014). "Large retrograde Centaurs: visitors from the Oort cloud?". Astrophysics and Space Science. 352 (2): 409–419(Ap&SSHomepage). arXiv:1406.1450. Bibcode:2014Ap&SS.352..409D. CiteSeerX 10.1.1.749.7255. doi:10.1007/s10509-014-1993-9. S2CID 119255885.
    4. Johnston, Wm. Robert (7 October 2018). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 17 October 2018.
    5. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 17 October 2018.
    6. Brown, Michael E. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 17 October 2018.
    7. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 October 2018.
    8. "LCDB Data for (468861)". Asteroid Lightcurve Database (LCDB). Retrieved 17 October 2018.

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