2010 BK118

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.[lower-alpha 1]

2010 BK118
Discovery[1][2]
Discovered byWISE
LINEAR (704)
Discovery date
  • January 2010 (WISE)
  • 19 September 2010 (LINEAR)
Designations
2010 BK118
Centaur (DES)[3]
Orbital characteristics[4]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 1
Observation arc1319 days (3.61 yr)
Aphelion
Perihelion6.1000 AU (912.55 Gm) (q)
Eccentricity0.98741 (e)
  • 8000 yr (barycentric)
  • 10665 yr (heliocentric)
0.12498° (M)
0.000092409°/day (n)
Inclination143.913° (i)
176.01° (Ω)
179.06° (ω)
Earth MOID5.09422 AU (762.084 Gm)
Jupiter MOID1.13298 AU (169.491 Gm)
Physical characteristics
Dimensions
21[6]
10.2[4]

    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, 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
    EpochBarycentric
    Aphelion (Q)
    (AU)    		Orbital
    period
    yr
    19507467300
    20507928000

    Notes
    1. 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]
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    References
    1. 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. "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. Retrieved 4 February 2016.
    6. "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)
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