(315530) 2008 AP129

(315530) 2008 AP129
Discovery [1]
Discovered by M. E. Schwamb
M. E. Brown
Discovery site Palomar Obs.
Discovery date 11 January 2008
Designations
MPC designation (315530) 2008 AP129
2008 AP129
TNO [1] · cubewano(?) [2]
Extended [3] · distant [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 3
Observation arc 26.49 yr (9,675 days)
Earliest precovery date 9 October 1989
Aphelion 47.583 AU
Perihelion 36.055 AU
41.819 AU
Eccentricity 0.1378
270.44 yr (98,778 d)
47.919°
0° 0m 12.96s / day
Inclination 27.378°
15.016°
58.670°
Physical characteristics
Dimensions 460.81 km (calculated)[5]
486 km[2]
494 km[6]
9.04±0.02 h[7]
0.07 (assumed)[6]
0.09 (assumed)[2]
0.10 (assumed)[5]
C (assumed)[5]
4.8[1][5] · 5.1[6]

    (315530) 2008 AP129 is a trans-Neptunian object and possibly a cubewano from the outermost regions of the Solar System, approximately 480 kilometers in diameter. It was discovered 11 January 2008, by American Michael E. Brown and Megan Schwamb at Palomar Observatory in California.[4]

    Description

    2008 AP129 orbits the Sun at a distance of 36.1–47.6 AU once every 270 years and 5 months (98,778 days; semi-major axis of 41.8 AU). Its orbit has an eccentricity of 0.14 and an inclination of 27° with respect to the ecliptic.[1] It has 3 precovery observations back to 1989.[4] Lightcurve analysis gave an ambiguous rotation period of 9.04 hours with a brightness amplitude of 0.12 magnitude (U=2).[5][7] Michael Brown considers it a probable dwarf planet with an estimated diameter of 496 kilometers and albedo of 0.07.[6]

    Numbering and naming

    This minor planet was numbered by the Minor Planet Center on 7 February 2012.[8] As of 2018, it has not been named.[4]

    References

    1. 1 2 3 4 5 "JPL Small-Body Database Browser: 315530 (2008 AP129)" (2016-04-05 last obs.). Jet Propulsion Laboratory. Retrieved 9 December 2017.
    2. 1 2 3 Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 16 November 2017.
    3. ↑ Marc W. Buie. "Orbit Fit and Astrometric record for 315530". SwRI (Space Science Department). Retrieved 2018-02-18.
    4. 1 2 3 4 "315530 (2008 AP129)". Minor Planet Center. Retrieved 9 December 2017.
    5. 1 2 3 4 5 "LCDB Data for (315530)". Asteroid Lightcurve Database (LCDB). Retrieved 9 December 2017.
    6. 1 2 3 4 Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 30 July 2017.
    7. 1 2 Thirouin, Audrey; Sheppard, Scott S.; Noll, Keith S.; Moskovitz, Nicholas A.; Ortiz, Jose Luis; Doressoundiram, Alain (June 2016). "Rotational Properties of the Haumea Family Members and Candidates: Short-term Variability". The Astronomical Journal. 151 (6): 20. arXiv:1603.04406. Bibcode:2016AJ....151..148T. doi:10.3847/0004-6256/151/6/148. Retrieved 9 December 2017.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 February 2018.
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