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17381 (1981 EC11)
Classification: Main-belt Asteroid          SPK-ID: 2017381
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1151961060473605 3.6982e-08  
a 2.669995974991787 1.3219e-08 au
q 2.362422835510607 9.9521e-08 au
i 4.40253940850242 4.174e-06 deg
node 286.1224350739799 6.208e-05 deg
peri 2.914711061734449 6.5314e-05 deg
M 302.9348596549194 2.0479e-05 deg
tp 2459453.099639146611
(2021-Aug-26.59963915)
9.0812e-05 TDB
period 1593.545017901971
4.36
1.1834e-05
3.24e-08
d
yr
n .2259114088122647 1.6777e-09 deg/d
Q 2.977569114472966 1.4742e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1133  
   data-arc span      14764 days (40.42 yr)  
   first obs. used      1979-12-20  
   last obs. used      2020-05-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .54519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:02:15  

Additional Information
 Earth MOID = 1.34416 au 
 Jupiter MOID = 2.17216 au 
 T_jup = 3.368 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.84   n/a E2021B10  

17381 (1981 EC11)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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