(612095) 1999 OJ4

Last updated

(612095) 1999 OJ4
Orbit of 1999 OJ4.gif
Orbital diagram of 1999 OJ4
Discovery [1]
Discovered by Mauna Kea Obs.
Discovery site Mauna Kea Obs.
Discovery date18 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
Mean diameter
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]

    (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]

    Contents

    Orbit and classification

    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. [10] [11]

    Satellite

    1999 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°, [lower-alpha 1] over fourteen times the apparent size of the Sun from Earth.

    Notes

    1. ↑ Calculated by solving .

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    References

    1. 1 2 3 "(612095) 1999 OJ4". Minor Planet Center. Retrieved 7 April 2022.
    2. 1 2 3 "JPL Small-Body Database Browser: 612095 (1999 OJ4)" (2008-10-01 last obs.). Jet Propulsion Laboratory . Retrieved 3 December 2018.
    3. 1 2 3 4 Johnston, Wm. Robert (2 January 2022). "List of Known Trans-Neptunian Objects". Johnston's Archive.
    4. 1 2 3 "Asteroid 1999 OJ4". Small Bodies Data Ferret. Retrieved 3 December 2018.
    5. ↑ Marc W. Buie. "Orbit Fit and Astrometric record for 99OJ4". SwRI (Space Science Department). Retrieved 3 December 2018.
    6. 1 2 Johnston, Wm. Robert (20 September 2014). "Asteroids with Satellites Database – 1999 OJ4". Johnston's Archive. Retrieved 3 December 2018.
    7. 1 2 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.
    8. ↑ "LCDB Data for (1999+OJ4)". Asteroid Lightcurve Database (LCDB). Retrieved 3 December 2018.
    9. 1 2 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.
    10. ↑ 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.
    11. ↑ 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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