2010 BK118

Centaur on a retrograde cometary orbit

2010 BK118 (also written 2010 BK118) is a centaur roughly 20–60 km in diameter. It is on a retrograde cometary orbit. It has a barycentric semi-major axis (average distance from the Sun) of ~400 AU.[a]

2010 BK118 came to perihelion in April 2012 at a distance of 6.1 AU from the Sun (outside the orbit of Jupiter).[4] It has a Jupiter-MOID of 1.1 AU.[4] As of 2016[update], it is 11 AU from the Sun.[6]

It will not be 50 AU from the Sun until 2043. After leaving the planetary region of the Solar System, 2010 BK118 will have a barycentric aphelion of 791 AU with an orbital period of 8000 years.

Orbital evolution
Epoch Barycentric
Aphelion (Q)
(AU)		 Orbital
period
yr
1950 746 7300
2050 792 8000

Notes

  1. ^ a b c Given the orbital eccentricity of this object, different epochs can generate quite different heliocentric unperturbed two-body best-fit solutions to the semi-major axis and orbital period. For objects at such high eccentricity, the Sun's barycentric coordinates are more stable than heliocentric coordinates. Using JPL Horizons, the barycentric semi-major axis is approximately 399 AU.[7]

References

  1. ^ a b Carl Hergenrother. "Recent Discoveries – Sept 17-24, 2010". The Transient Sky. Retrieved 4 February 2016.
  2. ^ "MPEC 2010-S36 : 2010 BK118". IAU Minor Planet Center. 22 September 2010. Retrieved 4 February 2016. (K10BB8K)
  3. ^ Marc W. Buie. "Orbit Fit and Astrometric record for 10BK118". SwRI (Space Science Department). Retrieved 4 February 2016.
  4. ^ a b c d "JPL Small-Body Database Browser: (2010 BK118)" (last observation: 2013-09-10; arc: 3.61 yr). Jet Propulsion Laboratory. Retrieved 25 March 2016.
  5. ^ "Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 4 February 2016.
  6. ^ a b "AstDyS 2010BK118 Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 4 February 2016.
  7. ^ Horizons output. "Barycentric Osculating Orbital Elements for 2010 BK118". Retrieved 4 February 2016. (Solution using the Solar System Barycenter and barycentric coordinates. Select Ephemeris Type:Elements and Center:@0)
  • 2010 BK118 at AstDyS-2, Asteroids—Dynamic Site
    • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
  • 2010 BK118 at the JPL Small-Body Database
    • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters
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