(612095) 1999 OJ4 (provisional designation 1999 OJ4) is a trans-Neptunian object and binary system from the classical Kuiper belt, located in the outermost region of the Solar System. The bright cubewano belongs to the cold population and measures approximately 75 kilometers (47 miles) in diameter. It was first observed at Mauna Kea Observatory on 18 July 1999. Discovered in 2005, its minor-planet moon is just 3 kilometers smaller than its primary and has an orbital period of 84 days.[1][6]
 Orbital diagram of 1999 OJ4 | |
| Discovery[1] | |
|---|---|
| Discovered by | Mauna Kea Obs. |
| Discovery site | Mauna Kea Obs. |
| Discovery date | 18 July 1999 |
| Designations | |
| (612095) 1999 OJ4 | |
| 1999 OJ4 | |
| TNO[2] · cubewano[3][4][5] cold | |
| Orbital characteristics[2] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 4 | |
| Observation arc | 9.21 yr (3,363 d) |
| Aphelion | 39.013 AU |
| Perihelion | 37.200 AU |
| 38.107 AU | |
| Eccentricity | 0.0238 |
| 235.24 yr (85,921 d) | |
| 294.62° | |
| 0° 0m 15.12s / day | |
| Inclination | 3.9954° |
| 127.44° | |
| 285.68° | |
| Known satellites | 1 (D: 72 km; P: 84.12 d)[6] |
| Physical characteristics | |
| 75 km[3] | |
| Mass | (0.4045±0.0063)×1018 kg (system)[7] |
| 0.1 (assumed)[8] 0.225[3][9] | |
| B–V = 1.68[3][4] V–R = 0.682[4] | |
| 7.1[1][2] | |
Orbit and classification
edit1999 OJ4 orbit characterizes it as a classical Kuiper Belt object, or cubewano. Due to its nearly circular orbit and low inclination, it is also in the "cold" population of cubewanos. As a result, it is likely reddish in color.[10][11]
Satellite
edit1999 OJ4 has one moon, S/2005 (1999 OJ4) 1. This moon was discovered by the Hubble Space Telescope[9] on 5 October 2013. It orbits 3306±17 km away from 1999 OJ4, completing one orbit every 84.1147±0.0050 d. The orbit has an eccentricity of 0.3683±0.0038.[7]
At about 72 km, it is nearly the same size as 1999 OJ4. From the surface of 1999 OJ4, S/2005 (1999 OJ4) 1 would have an apparent diameter of roughly 8.11°,[a] over fourteen times the apparent size of the Sun from Earth.
Notes
edit- ^ Calculated by solving .
References
edit- ^ a b c "(612095) 1999 OJ4". Minor Planet Center. Retrieved 7 April 2022.
- ^ a b c "JPL Small-Body Database Browser: 612095 (1999 OJ4)" (2008-10-01 last obs.). Jet Propulsion Laboratory. Retrieved 3 December 2018.
- ^ a b c d Johnston, Wm. Robert (2 January 2022). "List of Known Trans-Neptunian Objects". Johnston's Archive.
- ^ a b c "Asteroid 1999 OJ4". Small Bodies Data Ferret. Retrieved 3 December 2018.
- ^ Marc W. Buie. "Orbit Fit and Astrometric record for 99OJ4". SwRI (Space Science Department). Retrieved 3 December 2018.
- ^ a b Johnston, Wm. Robert (20 September 2014). "Asteroids with Satellites Database – 1999 OJ4". Johnston's Archive. Retrieved 3 December 2018.
- ^ a b Grundy, W.M.; Noll, K.S.; Roe, H.G.; Buie, M.W.; Porter, S.B.; Parker, A.H.; Nesvorný, D.; Levison, H.F.; Benecchi, S.D.; Stephens, D.C.; Trujillo, C.A. (December 2019). "Mutual orbit orientations of transneptunian binaries". Icarus. 334: 62–78. doi:10.1016/j.icarus.2019.03.035.
- ^ "LCDB Data for (1999+OJ4)". Asteroid Lightcurve Database (LCDB). Retrieved 3 December 2018.
- ^ a b Grundy, W. M.; et al. (2009). "Mutual Orbits and Masses of Six Transneptunian Binaries". Icarus. arXiv:0812.3126. Bibcode:2009Icar..200..627G. doi:10.1016/j.icarus.2008.12.008.
- ^ A. Doressoundiram; N. Peixinho; C. de Bergh; S. Fornasier; P. Thebault; M. A. Barucci; et al. (October 2002). "The Color Distribution in the Edgeworth-Kuiper Belt". The Astronomical Journal. 124 (4): 2279. arXiv:astro-ph/0206468. Bibcode:2002AJ....124.2279D. doi:10.1086/342447.
- ^ Nuno Peixinho; Pedro Lacerda & David Jewitt (August 2008). "Color-inclination relation of the classical Kuiper belt objects". The Astronomical Journal. 136 (5): 1837. arXiv:0808.3025. Bibcode:2008AJ....136.1837P. doi:10.1088/0004-6256/136/5/1837.
External links
edit- 1999 OJ4 – System parameters, Lowell Observatory
- List of Transneptunian Objects, Minor Planet Center
- List of binary asteroids/TNOs, Johnston's Archive
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- (612095) 1999 OJ4 at AstDyS-2, Asteroids—Dynamic Site
- (612095) 1999 OJ4 at the JPL Small-Body Database
