2010 JO179

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]

2010 JO179
Discovery [1][2]
Discovered byPan-STARRS 1
Discovery siteHaleakala Obs.
Discovery date10 May 2010
(first observed only)
Designations
2010 JO179
TNO [3] · 5:21 res [4]
SDO [5][6] · distant [1]
p-DP [7]
Orbital characteristics [3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 2
Observation arc12.32 yr (4,501 days)
Earliest precovery date11 May 2005 (SDSS)[1]
Aphelion118.674 AU
Perihelion39.608 AU
79.141 AU
Eccentricity0.49953
704.06 yr (256,982 d)
34.325°
0° 0m 5.04s / day[3]
Inclination32.033°
147.262°
10.704°
Physical characteristics
Mean diameter
597 km[7]
702 km[5]
600–900 km[4]
30.6 h[4]
30.6324 h (best fit)[4]
0.07 ~ 0.21 (estimated)[4]
0.10 (assumed)[7]
0.09 (assumed)[5]
G–R = 0.88±0.21 (red)[4]
3.44±0.10 (R-band)[4]
4.0[3][1]
4.3 (Brown)[7]

    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] There are 11 May 2005 precovery images from the Sloan Digital Sky Survey, approximately doubling the observation arc.[1]

    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 574 and 702 kilometers, with an assumed albedo of 0.09, by Michael Brown and the Johnston's Archive respectively,[5][7] while the discoverers estimate a diameter of 600–900 kilometers with an estimated albedo of 0.21 to 0.07.[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 below the 600-kilometer mark.[7]

    Numbering and naming

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

    gollark: <@!340622484674052096>
    gollark: t!weather Core of Sun
    gollark: t!weather Sun
    gollark: t!weather Sol
    gollark: ....

    References
    1. "2010 JO179". Minor Planet Center. Retrieved 21 February 2018.
    2. "MPEC 2017-S54 : 2010 JO179". Minor Planet Center. 18 September 2017. Retrieved 21 February 2018.
    3. "JPL Small-Body Database Browser: (2010 JO179)" (2016-07-30 last obs.). Jet Propulsion Laboratory. Retrieved 21 February 2018.
    4. 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. Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 15 December 2017.
    6. "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 15 December 2017.
    7. 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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