(574372) 2010 JO179 (provisional designation 2010 JO179) is a large, high-order resonant trans-Neptunian object in the outermost regions of the Solar System, approximately 700 kilometers (430 miles) in diameter.[6] Long-term observations suggest that the object is in a meta-stable 5:21 resonance with Neptune.[6] Other sources classify it as a scattered disc object.[4][5] It is possibly large enough to be a dwarf planet.[6]
| Discovery[1][2] | |
|---|---|
| Discovered by | Pan-STARRS 1 |
| Discovery site | Haleakala Obs. |
| Discovery date | 10 May 2010 |
| Designations | |
| (574372) 2010 JO179 | |
| 2010 JO179 | |
| TNO[3] · SDO[4][5] · 5:21 res.[6] p-DP · distant[1] | |
| Orbital characteristics[3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 69.54 yr (25,399 days) |
| Earliest precovery date | 4 February 1951 (POSS-I)[1] |
| Aphelion | 117.997 AU |
| Perihelion | 39.590 AU |
| 78.793 AU | |
| Eccentricity | 0.49755 |
| 699.43 yr (255,466 d) | |
| 35.211° | |
| 0° 0m 5.04s / day[3] | |
| Inclination | 32.025° |
| 147.350° | |
| 1951-Sep-13[7] | |
| 10.427° | |
| Physical characteristics | |
Mean diameter | 597 km[8] 735 km[4] 600–900 km[6] |
| 30.6 h[6] 30.6324 h (best fit)[6] | |
| 0.07 ~ 0.21 (estimated)[6] 0.10 (assumed)[8] 0.09 (assumed)[4] | |
| G–R = 0.88±0.21 (red)[6] | |
| 3.44±0.10 (R-band)[6] 4.0[3][1] 4.3 (Brown)[8] | |
First observation and orbit edit
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.[6] 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]
Numbering and naming edit
This minor planet was numbered by the Minor Planet Center on 10 August 2021, receiving the number (574372) in the minor planet catalog (M.P.C. 133504).[9] As of 2021[update], it has not been named.[1]
Physical characteristics edit
Photometry edit
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.[6]
Diameter and albedo edit
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,[4][8] while the discoverers estimate a diameter of 600–900 kilometers with an estimated albedo of 0.21 to 0.07.[6]
References edit
- ^ a b c d e f g "2010 JO179". Minor Planet Center. Retrieved 27 August 2020.
- ^ a b "MPEC 2017-S54 : 2010 JO179". Minor Planet Center. 18 September 2017. Retrieved 21 February 2018.
- ^ a b c d e "JPL Small-Body Database Browser: (2010 JO179)" (2020-08-19 last obs.). Jet Propulsion Laboratory. Retrieved 28 August 2020.
- ^ a b c d e Johnston, Wm. Robert (15 October 2017). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 15 December 2017.
- ^ a b "List Of Centaurs and Scattered-Disk Objects". Minor Planet Center. Retrieved 15 December 2017.
- ^ a b c d e f g h i j k l m 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. arXiv:1709.05427. Bibcode:2018ApJ...855L...6H. doi:10.3847/2041-8213/aaadb3. S2CID 55279330.
- ^ "Horizons Batch for 574372 (2010 JO179) on 1951-Sep-13" (Perihelion occurs when rdot flips from negative to positive). JPL Horizons. Retrieved 21 September 2021. (JPL#8/Soln.date: 2021-Aug-26)
- ^ a b c d Michael E. Brown. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 15 December 2017.
- ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 21 August 2021.
External links edit
- MPEC, 18 September 2017
- 1951 precovery images
- (574372) 2010 JO179 at AstDyS-2, Asteroids—Dynamic Site
- (574372) 2010 JO179 at the JPL Small-Body Database