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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03202175984427834 5.7474e-08  
a 2.325499572950451 1.3843e-08 au
q 2.25103298410746 1.3653e-07 au
i 5.321302121329262 7.5442e-06 deg
node 212.7928426671951 4.9252e-05 deg
peri 311.0388525281373 0.0001099 deg
M 252.4527145585672 9.8154e-05 deg
tp 2459387.463297520492
(2021-Jun-21.96329752)
0.00035361 TDB
period 1295.307329567512
3.55
1.1566e-05
3.167e-08
d
yr
n .2779263204819507 2.4816e-09 deg/d
Q 2.399966161793442 1.4286e-08 au
  Orbit Determination Parameters
   # obs. used (total)      362  
   data-arc span      6280 days (17.19 yr)  
   first obs. used      2002-11-14  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .6086  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 05:56:13  

Additional Information
 Earth MOID = 1.25963 au 
 Jupiter MOID = 2.57105 au 
 T_jup = 3.568 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457021.5 (2014-Dec-30.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0312225469845419 5.763e-08  
q 2.252749250034291 1.3678e-07 au
tp 2456796.176456898191
(2014-May-18.67645690)
0.00036033 TDB
node 212.8187271290582 4.923e-05 deg
peri 310.912690374929 0.00011214 deg
i 5.321914310175287 7.5471e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      362  
   data-arc span      6280 days (17.19 yr)  
   first obs. used      2002-11-14  
   last obs. used      2020-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .6086  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-25 05:56:13  

Additional Information
 Jupiter MOID = 2.57105 au 
 T_jup = 3.568 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.321182943663614E-15 -7.845294263982534E-15 9.869280641571783E-12 7.563073706867666E-16 2.767646351991802E-12 1.945342856422119E-15
q -7.845294263982534E-15 1.870798402422432E-14 -2.261534204826804E-11 -2.300014333344327E-15 -6.339758929875374E-12 -3.949683658573978E-15
tp 9.869280641571783E-12 -2.261534204826804E-11 1.298359814971722E-7 -3.927517952556085E-11 3.631552753399691E-8 2.228436489612031E-11
node 7.563073706867666E-16 -2.300014333344327E-15 -3.927517952556085E-11 2.423613246208485E-9 -2.423425089067774E-9 -5.416599488025589E-11
peri 2.767646351991802E-12 -6.339758929875374E-12 3.631552753399691E-8 -2.423425089067774E-9 1.257448292400487E-8 6.026292794348974E-11
i 1.945342856422119E-15 -3.949683658573978E-15 2.228436489612031E-11 -5.416599488025589E-11 6.026292794348974E-11 5.695881632330579E-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 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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