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216911 (2009 KJ4)
Classification: Main-belt Asteroid          SPK-ID: 2216911
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2020141979733695 4.5293e-08  
a 2.350955058843788 1.2478e-08 au
q 1.876028758160025 1.0934e-07 au
i 7.824558843928222 6.0528e-06 deg
node 38.18674496042455 3.6941e-05 deg
peri 263.9589639849065 3.9785e-05 deg
M 342.5517424426874 1.4134e-05 deg
tp 2459064.313781386958
(2020-Aug-02.81378139)
5.1752e-05 TDB
period 1316.633550590659
3.60
1.0483e-05
2.87e-08
d
yr
n .2734245985441426 2.1769e-09 deg/d
Q 2.825881359527552 1.4999e-08 au
  Orbit Determination Parameters
   # obs. used (total)      202  
   data-arc span      6546 days (17.92 yr)  
   first obs. used      2002-07-16  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53446  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 04:16:42  

Additional Information
 Earth MOID = .880631 au 
 Jupiter MOID = 2.44664 au 
 T_jup = 3.518 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.0   n/a MPO433420  

216911 (2009 KJ4)          Discovered 2009-May-24 by Lowe, A. at Mayhill
Reference: 20090707/Numbers.arcLast Updated: 2009-07-09

[ show close-approach data ]
Alternate Designations
 2009 KJ4 = 2006 UR157 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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