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216720 (2005 EW198)
Classification: Main-belt Asteroid          SPK-ID: 2216720
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .167294800271077 4.1433e-08  
a 2.423154325799912 1.2598e-08 au
q 2.01777320683922 1.037e-07 au
i 1.96252665984631 5.1585e-06 deg
node 211.3967408672129 0.00015804 deg
peri 30.18050287346869 0.0001591 deg
M 77.39834924889418 1.9324e-05 deg
tp 2459100.290327622866
(2020-Sep-07.79032762)
7.3157e-05 TDB
period 1377.748790388985
3.77
1.0744e-05
2.942e-08
d
yr
n .2612958200444944 2.0377e-09 deg/d
Q 2.828535444760605 1.4705e-08 au
  Orbit Determination Parameters
   # obs. used (total)      218  
   data-arc span      8498 days (23.27 yr)  
   first obs. used      1997-02-15  
   last obs. used      2020-05-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56308  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 23:56:01  

Additional Information
 Earth MOID = 1.00571 au 
 Jupiter MOID = 2.181 au 
 T_jup = 3.492 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457192.5 (2015-Jun-19.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1673780368857832 4.1383e-08  
q 2.016488641214166 1.0331e-07 au
tp 2457722.184233615061
(2016-Nov-29.68423362)
7.0123e-05 TDB
node 211.531133131001 0.00015829 deg
peri 29.95880511713779 0.00015935 deg
i 1.960878063394818 5.1549e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      218  
   data-arc span      8498 days (23.27 yr)  
   first obs. used      1997-02-15  
   last obs. used      2020-05-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56308  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 23:56:01  

Additional Information
 Jupiter MOID = 2.181 au 
 T_jup = 3.492 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.712589510479551E-15 -4.255249033525557E-15 -3.09524753900585E-13 -1.025005576157208E-15 -1.822797263494896E-14 -6.461611393488751E-16
q -4.255249033525557E-15 1.067248937905457E-14 9.012348331433306E-13 5.290682399988551E-15 6.624017785308957E-14 1.662538175852252E-15
tp -3.09524753900585E-13 9.012348331433306E-13 4.917285440974008E-9 4.216903664060027E-11 1.313070399409532E-9 2.305309631583137E-13
node -1.025005576157208E-15 5.290682399988551E-15 4.216903664060027E-11 2.505422606767677E-8 -2.502719343654474E-8 -2.177803042860829E-10
peri -1.822797263494896E-14 6.624017785308957E-14 1.313070399409532E-9 -2.502719343654474E-8 2.539166517160123E-8 2.176927705866588E-10
i -6.461611393488751E-16 1.662538175852252E-15 2.305309631583137E-13 -2.177803042860829E-10 2.176927705866588E-10 2.657316995504628E-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 17.43   n/a E2021B55  

216720 (2005 EW198)          Discovered 2005-Mar-11 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20090707/Numbers.arcLast Updated: 2009-07-09
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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