1999 OJ4

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1999 OJ4
Orbit of 1999 OJ4.gif
Orbit of 1999 OJ4
Discovery and designation
Discovered by Mauna Kea Observatory
Discovery date July 18, 1999
Orbital characteristics[1][2][3]
Aphelion 38.9821849 AU (5,831.6519 Gm)
Perihelion 36.9289344 AU (5,524.4900 Gm)
37.9555596 AU (5,678.0709 Gm)
Eccentricity .027048087
233.84 years
275.664317°
Inclination 4.00407256°
127.534875°
296.645795°
Known satellites 1
Proper orbital elements
1.5395 deg / yr
233.84216 yr
(85410.848 d)
Physical characteristics
Dimensions 75 km (47 mi)
0.21 (geometric)[1][4]
Temperature 43 K (-230°C)
7.1[2]

1999 OJ4 is a fairly small cubewano that orbits in a nearly circular orbit. It is orbited by S/2005 (1999 OJ4) 1, a moon just 3 kilometres smaller than 1999 OJ4 itself.[1]

Orbit and Relationship with the Kuiper Belt[edit]

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.[5][6]

Moon[edit]

1999 OJ4 has one moon, S/2005 (1999 OJ4) 1. This moon was discovered by the Hubble Space Telescope[4] on October 5, 2013.[1] It orbits 3,267 kilometres away from 1999 OJ4, completing one orbit every 84.115 days.[1][4] 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°,[a] over fourteen times the apparent size of the Sun from Earth.

Notes[edit]

  1. ^ Calculated by solving  \scriptstyle{\mathrm{tan}\left(\frac{\theta}{2}\right) = \frac{\mathrm{radius~of~moon}}{\mathrm{distance~from~surface~of~asteroid~to~center~of~moon}}}.

References[edit]

  1. ^ a b c d e Johnston, W. R. (28 December 2008). "1999 OJ4". Johnston's Archive. Retrieved 2013-10-14. 
  2. ^ a b "(1999 OJ4) orbit diagram". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 3031899. 
  3. ^ "1999 OJ4". Lowell. 26 March 2013. Retrieved 2013-10-14. 
  4. ^ a b c 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. 
  5. ^ A. Doressoundiram, N. Peixinho, C. de Bergh, S. Fornasier, P. Thebault, M. A. Barucci,C. Veillet (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. 
  6. ^ Nuno Peixinho, Pedro Lacerda and 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.