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226675 (2004 HE18)
Classification: Main-belt Asteroid          SPK-ID: 2226675
[ 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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03202175921558847 5.5754e-08  
a 2.325499572725417 1.3469e-08 au
q 2.25103298535165 1.3334e-07 au
i 5.321302055036325 7.0905e-06 deg
node 212.7928425859563 4.8825e-05 deg
peri 311.0388514920729 0.00010644 deg
M 252.4527157547674 9.4026e-05 deg
tp 2459387.463293160304
(2021-Jun-21.96329316)		 0.00033854 TDB
period 1295.307329379495
3.55		 1.1253e-05
3.081e-08		 d
yr
n .2779263205222923 2.4145e-09 deg/d
Q 2.399966160099184 1.39e-08 au
   Orbit Determination Parameters
   # obs. used (total)      370  
   data-arc span      6577 days (18.01 yr)  
   first obs. used      2002-11-14  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60366  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 23:59:48  

Additional Information
 Earth MOID = 1.25963 au 
 Jupiter MOID = 2.57105 au 
 T_jup = 3.568 
[ 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 16.5   n/a MPO450051  

226675 (2004 HE18)          Discovered 2004-Apr-17 by LINEAR at Socorro
Reference: 20091202/Numbers.arcLast Updated: 2009-12-04
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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