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281507 Johnellen (2008 TM9)
Classification: Main-belt Asteroid          SPK-ID: 2281507
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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06451207674966131 7.5899e-08  
a 2.604385315417121 3.6235e-08 au
q 2.43637101006324 1.9152e-07 au
i 13.90624676995713 7.2229e-06 deg
node 238.3991750156576 2.3153e-05 deg
peri 170.4980861459548 5.1399e-05 deg
M 320.7062702671915 4.4782e-05 deg
tp 2459564.062579247332
(2021-Dec-15.56257925)
0.00019156 TDB
period 1535.16932445008
4.20
3.2038e-05
8.772e-08
d
yr
n .234501819614561 4.894e-09 deg/d
Q 2.772399620771001 3.8573e-08 au
  Orbit Determination Parameters
   # obs. used (total)      250  
   data-arc span      7185 days (19.67 yr)  
   first obs. used      2000-10-25  
   last obs. used      2020-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53389  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-14 04:17:49  

Additional Information
 Earth MOID = 1.44773 au 
 Jupiter MOID = 2.5611 au 
 T_jup = 3.369 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.05   n/a MPCxxxxx  

281507 Johnellen           Discovered 2008 Oct. 7 by D. McDonald at Celbridge.
Named for the parents of the discoverer, John and Ellen McDonald, for their inspiration and encouragement of his interest in astronomy.
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 2019-05-18Last Updated: 2019-05-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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