1999 OJ4

1999 OJ4
Orbital diagram of 1999 OJ4
Discovery [1]
Discovery site Mauna Kea Obs.
Discovery date 18 July 1999
Designations
MPC designation 1999 OJ4
TNO [2] · cubewano [3][4]
Orbital characteristics [2][5]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc 9.21 yr (3,363 days)
Aphelion 38.832 AU
Perihelion 37.071 AU
37.951 AU
Eccentricity 0.0232
233.80 yr (85,396 d)
282.23°
0° 0m 15.12s / day
Inclination 4.0005°
127.50°
295.58°
Known satellites 1 (D: 72 km; P: 84.12 h)[3]
Physical characteristics
Dimensions 75 km[3]
159.78 km (calculated)[6]
0.1 (assumed)[6] · 0.21[3][7]
7.1[2]

    1999 OJ4 is a trans-Neptunian object and binary system from the "cold" cubewano population, located in the outermost region of the Solar System. It was first observed at Mauna Kea Observatory on 18 July 1999, and measures approximately 75 kilometers in diameter. Discovered in 2005, its minor-planet moon is just 3 kilometres smaller than its primary and has an orbital period of 84 hours.[1][3]

    Orbit and Relationship with the Kuiper Belt

    1999 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.[8][9]

    Moon

    1999 OJ4 has one moon, S/2005 (1999 OJ4) 1. This moon was discovered by the Hubble Space Telescope[7] on 5 October 2013.[3] It orbits 3,267 kilometres away from 1999 OJ4, completing one orbit every 84.115 days.[3][7] At 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°,[lower-alpha 1] over fourteen times the apparent size of the Sun from Earth.

    Notes

    1. ↑ Calculated by solving .

    References

    1. 1 2 "1999 OJ4". Minor Planet Center. Retrieved 12 December 2017.
    2. 1 2 3 "JPL Small-Body Database Browser: (1999 OJ4)" (2008-10-01 last obs.). Jet Propulsion Laboratory. Retrieved 12 December 2017.
    3. 1 2 3 4 5 6 7 Johnston, W. R. (28 December 2008). "1999 OJ4". Johnston's Archive. Retrieved 12 December 2017.
    4. ↑ Marc W. Buie. "Orbit Fit and Astrometric record for 99OJ4". SwRI (Space Science Department). Retrieved 2018-02-17.
    5. ↑ "1999 OJ4". Lowell. 26 March 2013. Retrieved 2013-10-14.
    6. 1 2 "LCDB Data for (1999)". Asteroid Lightcurve Database (LCDB). Retrieved 12 December 2017.
    7. 1 2 3 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.
    8. ↑ 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.
    9. ↑ 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.

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