2010 JO179

2010 JO179
Discovery [1][2]
Discovered by Pan-STARRS 1
Discovery site Haleakala Obs.
Discovery date 10 May 2010
(first observed only)
Designations
MPC designation 2010 JO179
TNO [3] · 5:21 res [4]
SDO [5][6] · distant [1]
p-DP [7]
Orbital characteristics [3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 3 [3] · 1 [1]
Observation arc 11.22 yr (4,098 days)
Aphelion 119.04 AU
Perihelion 39.562 AU
79.303 AU
Eccentricity 0.5011
706.22 yr (257,947 d)
33.623°
0° 0m 5.04s / day[3]
Inclination 32.041°
147.16°
10.771°
Physical characteristics
Mean diameter
 598 km[7]
600–900 km[4]
702 km[5]
30.6 h[4]
0.09 (assumed)[5]
0.10 (estimated)[7]
G–R = 0.88±0.21 (red)[4]
3.4±0.1[4]
3.9803[3]
4.3[7]

    2010 JO179 is a high-order resonant trans-Neptunian object and a likely dwarf-planet candidate from the outermost regions of the Solar System, approximately 700 kilometers in diameter.[4] Long-term observations suggest that the object is in a meta-stable 5:21 resonance with Neptune.[4] Other sources classify it as a scattered disc object.[5][6]

    First observation and orbit

    The Minor Planet Center credits the object's first official observation on 10 May 2010 to Pan-STARRS (F51) at Haleakala Observatory, Hawaii, United States.[1][2] The observations were made by Pan-STARRS' Outer Solar System Survey.[4]

    2010 JO179 orbits the Sun at a distance of 39.5–119 AU once every 706 years and 1 month (semi-major axis of 79.3 AU). Its orbit has a high eccentricity of 0.50 and an inclination of 32° with respect to the ecliptic.[3]

    Physical characteristics

    Photometry

    Photometric observations of 2010 JO179 gave a monomodal lightcurve with slow rotation period of 30.6 hours, suggesting a rather spherical shape with significant albedo patchiness. An alternative period solution of a bimodal lightcurve is considered less likely. It would double the period and imply an ellipsoidal shape with an axis-ratio of at least 1.58.[4]

    Diameter and albedo

    The object's mean diameter has been estimated to measure 598 and 702 kilometers with an assumed albedo of 0.10 and 0.09, respectively,[5][7] while the discoverers estimate a diameter of 600–900 kilometers.[4] In his classification scheme, astronomer Michael Brown considers this object a likely dwarf planet, rather than a "highly likely" one, as his diameter-estimate is just below the 600-kilometer mark.[7]

    Numbering and naming

    As of 2018, this minor planet has not been numbered or named.[1]

    References

    1. 1 2 3 4 5 "2010 JO179". Minor Planet Center. Retrieved 21 February 2018.
    2. 1 2 "MPEC 2017-S54 : 2010 JO179". Minor Planet Center. 18 September 2017. Retrieved 21 February 2018.
    3. 1 2 3 4 5 6 "JPL Small-Body Database Browser: (2010 JO179)" (2016-07-30 last obs.). Jet Propulsion Laboratory. Retrieved 21 February 2018.
    4. 1 2 3 4 5 6 7 8 9 10 Holman, Matthew J.; Payne, Matthew J.; Fraser, Wesley; Lacerda, Pedro; Bannister, Michele T.; Lackner, Michael; et al. (September 2017). "A dwarf planet class object in the 21:5 resonance with Neptune". arXiv:1709.05427 [astro-ph.EP].
    5. 1 2 3 4 5 Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 15 December 2017.
    6. 1 2 "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 15 December 2017.
    7. 1 2 3 4 5 6 Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 15 December 2017.

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