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12104 Chesley (1998 KO6)
Classification: Main-belt Asteroid          SPK-ID: 2012104
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457400.5 (2016-Jan-13.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02389691796066464 4.8972e-08  
a 3.01176891579955 2.8777e-08 au
q 2.939796921102208 1.5108e-07 au
i 11.15002008066495 5.4963e-06 deg
node 78.06834842057685 3.3389e-05 deg
peri 183.195065217422 0.00017778 deg
M 109.2413389289572 0.00017554 deg
tp 2456821.184150424068
0.00093181 JED
period 1909.109755446737
n .1885695670313931 2.7027e-09 deg/d
Q 3.083740910496892 2.9465e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1076  
   data-arc span      14523 days (39.76 yr)  
   first obs. used      1976-02-28  
   last obs. used      2015-12-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50518  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Jan-04 13:19:40  

Additional Information
 Earth MOID = 1.92314 au 
 Jupiter MOID = 1.94653 au 
 T_jup = 3.220 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.6 mag n/a MPO350898  
rotation period rot_per 3.9456 h n/a LCDB (Rev. 2015-December); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Galad, A. (2010) Astron. Astrophys. 514, A55.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]

12104 Chesley           Discovered 1998 May 22 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Steven R. Chesley (b. 1965), of the Solar System Dynamics Group at the Jet Propulsion Laboratory, is an expert in determination of the orbits of minor planets and application to the study of earth-impact probability. He was also a member of the NEAR spacecraft navigation team.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020724/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Alternate Designations
 1998 KO6 = 1976 DU 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-Feb-13 23:45 UT
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