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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06537938209644351 7.7954e-08  
a 2.605797831851042 3.5926e-08 au
q 2.435432379736369 1.9775e-07 au
i 13.91379762301869 7.5812e-06 deg
node 238.4901885553747 2.3248e-05 deg
peri 169.8900490685722 5.1592e-05 deg
M 228.4992758706067 4.4471e-05 deg
tp 2459561.722595635598
(2021-Dec-13.22259564)
0.00019148 TDB
period 1536.418417209726
4.21
3.1774e-05
8.699e-08
d
yr
n .2343111719877664 4.8457e-09 deg/d
Q 2.776163283965715 3.8275e-08 au
  Orbit Determination Parameters
   # obs. used (total)      239  
   data-arc span      6740 days (18.45 yr)  
   first obs. used      2000-10-25  
   last obs. used      2019-04-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54181  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 14:47:00  

Additional Information
 Earth MOID = 1.44731 au 
 Jupiter MOID = 2.56375 au 
 T_jup = 3.368 
[ 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 15.9   n/a MPO470976  

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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