Astronomy:2010 JO179

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2010 JO179
Discovery [1][2]
Discovered byPan-STARRS 1
Discovery siteHaleakala Obs.
Discovery date10 May 2010
(first observed only)
Designations
2010 JO179
Minor planet categoryTNO [3] · 5:21 res [4]
SDO [5][6] · distant [1]
p-DP [7]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 2
Observation arc69.54 yr (25,399 days)
Earliest precovery date4 February 1951 (POSS-I)[1]
|{{{apsis}}}|helion}}117.997 AU
|{{{apsis}}}|helion}}39.590 AU
78.793 AU
Eccentricity0.49755
Orbital period699.43 yr (255,466 d)
Mean anomaly35.211°
Mean motion0° 0m 5.04s / day[3]
Inclination32.025°
Longitude of ascending node147.350°
|{{{apsis}}}|helion}}1951-Sep-12
10.427°
Physical characteristics
Mean diameter597 km[7]
735 km[5]
600–900 km[4]
Rotation period30.6 h[4]
30.6324 h (best fit)[4]
Geometric albedo0.07 ~ 0.21 (estimated)[4]
0.10 (assumed)[7]
0.09 (assumed)[5]
G–R = 0.88±0.21 (red)[4]
Absolute magnitude (H)3.44±0.10 (R-band)[4]
4.0[3][1]
4.3 (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 libration of 2010 JO179's nominal orbit, in a frame co-rotating with Neptune (click image to view animation)

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 4 February 1951 precovery images from the Palomar Observatory Sky Survey, extending the observation arc by approximately 60 years.[1] The precovery images are from the same year the object came to perihelion (closest approach to the Sun).

2010 JO179 orbits the Sun at a distance of 39.6–118 AU once every 699 years and 5 months (semi-major axis of 78.8 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 735 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]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "2010 JO179". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?object_id=2010+JO179. Retrieved 27 August 2020. 
  2. ↑ 2.0 2.1 "MPEC 2017-S54 : 2010 JO179". Minor Planet Center. 18 September 2017. https://minorplanetcenter.net/mpec/K17/K17S54.html. Retrieved 21 February 2018. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "JPL Small-Body Database Browser: (2010 JO179)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3781468. Retrieved 28 August 2020. 
  4. ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 Holman, Matthew J.; Payne, Matthew J.; Fraser, Wesley; Lacerda, Pedro; Bannister, Michele T.; Lackner, Michael et al. (2018). "A dwarf planet class object in the 21:5 resonance with Neptune". The Astrophysical Journal 855 (1): L6. doi:10.3847/2041-8213/aaadb3. Bibcode: 2018ApJ...855L...6H. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. http://www.johnstonsarchive.net/astro/tnoslist.html. Retrieved 15 December 2017. 
  6. ↑ 6.0 6.1 "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. http://www.minorplanetcenter.org/iau/lists/Centaurs.html. Retrieved 15 December 2017. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. http://web.gps.caltech.edu/~mbrown/dps.html. Retrieved 15 December 2017. 

External links




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