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2010 JO179

2010 JO179
Discovery [1][2]
Discovered byPan-STARRS 1
Discovery siteHaleakala Obs.
Discovery date10 May 2010
(first observed only)
MPC designation2010 JO179
TNO[3] · 5:21 res[4]
SDO[5][6] · distant[1]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 3 [3] · 1 [1]
Observation arc11.22 yr (4,098 days)
Earliest precovery date11 May 2005 (SDSS)[1]
Aphelion119.04 AU
Perihelion39.562 AU
79.303 AU
706.22 yr (257,947 d)
0° 0m 5.04s / day[3]
Physical characteristics
Mean diameter
574 km[7]
600–900 km[4]
702 km[5]
30.6 h[4]
0.07 ~ 0.21 (estimated)[4]
0.09 (assumed)[5][7]
G–R = 0.88±0.21 (red)[4]
3.44±0.10 (R-band)[4]
4.5 (Brown)[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] 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


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]


  1. ^ a b c d e f g h "2010 JO179". Minor Planet Center. Retrieved 21 February 2018.
  2. ^ a b "MPEC 2017-S54 : 2010 JO179". Minor Planet Center. 18 September 2017. Retrieved 21 February 2018.
  3. ^ a b c d e f "JPL Small-Body Database Browser: (2010 JO179)" (2016-07-30 last obs.). Jet Propulsion Laboratory. Retrieved 21 February 2018.
  4. ^ a b c d e f g h i j k 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. ^ a b c d e Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 15 December 2017.
  6. ^ a b "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 15 December 2017.
  7. ^ a b c d e f Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 15 December 2017.

External links