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(612095) 1999 OJ4

Trans-Neptunian binary From Wikipedia, the free encyclopedia

(612095) 1999 OJ4
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(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 moon is just 3 kilometers smaller than its primary and has an orbital period of 84 days.[1][6]

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Orbit and classification

1999 OJ4's 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. 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, it would have an apparent diameter of roughly 8.11°,[a] over fourteen times the apparent size of the Sun from Earth.

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Notes

  1. Calculated by solving .
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References

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