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JPL Small-Body Database Browser
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9526 Billmckinnon (1981 EC13)
Classification: Main-belt Asteroid          SPK-ID: 2009526
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02577653425268673 5.2157e-08  
a 2.919339876800049 2.1863e-08 au
q 2.844089412470478 1.5219e-07 au
i 6.564374353644028 5.3568e-06 deg
node 310.0884974146616 5.2727e-05 deg
peri 282.2712984386201 0.00012085 deg
M 182.93486973163 0.00010893 deg
tp 2459496.598929975633
(2021-Oct-09.09892998)
0.00055102 TDB
period 1821.903693303609
4.99
2.0467e-05
5.604e-08
d
yr
n .1975955157910799 2.2197e-09 deg/d
Q 2.99459034112962 2.2427e-08 au
  Orbit Determination Parameters
   # obs. used (total)      823  
   data-arc span      13860 days (37.95 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5412  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 19:01:51  

Additional Information
 Earth MOID = 1.84092 au 
 Jupiter MOID = 2.03624 au 
 T_jup = 3.270 
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Orbital Elements at Epoch 2456612.5 (2013-Nov-16.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02868278316062012 5.1609e-08  
q 2.83347205960137 1.5104e-07 au
tp 2455857.555929973434
(2011-Oct-23.05592997)
0.0005 TDB
node 310.1752635901061 5.2606e-05 deg
peri 282.9365983396494 0.00011156 deg
i 6.574880073632858 5.3609e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      823  
   data-arc span      13860 days (37.95 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5412  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 19:01:51  

Additional Information
 Jupiter MOID = 2.03624 au 
 T_jup = 3.270 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.663479613860779E-15 -7.718322986708754E-15 -6.716065447438642E-12 4.448678588012137E-15 -1.325249568647545E-12 1.467124614765085E-15
q -7.718322986708754E-15 2.281405057202451E-14 1.861289607081153E-11 -1.143506669833798E-14 3.704272711921147E-12 -3.530638387470127E-15
tp -6.716065447438642E-12 1.861289607081153E-11 2.499982270306271E-7 -4.958549670622488E-13 4.924091766284915E-8 -5.946120221743448E-12
node 4.448678588012137E-15 -1.143506669833798E-14 -4.958549670622488E-13 2.76738298683746E-9 -2.748729852059795E-9 6.863701480070046E-11
peri -1.325249568647545E-12 3.704272711921147E-12 4.924091766284915E-8 -2.748729852059795E-9 1.244672487037478E-8 -6.928382108920212E-11
i 1.467124614765085E-15 -3.530638387470127E-15 -5.946120221743448E-12 6.863701480070046E-11 -6.928382108920212E-11 2.873952771942399E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO381339  

9526 Billmckinnon           Discovered 1981 Mar. 1 by S. J. Bus at Siding Spring.
William B. McKinnon (b. 1954) is a professor of planetary science at Washington University in St. Louis. His research focuses on the physics of impact cratering for surfaces of rocky and icy bodies, ranging from the Jovian satellite system to the Kuiper Belt.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2014-07-12Last Updated: 2014-08-13
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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