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20974 (1981 EO2)
Classification: Main-belt Asteroid          SPK-ID: 2020974
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03419387907074669 3.7044e-08  
a 2.983004746856413 1.7074e-08 au
q 2.881004243274941 1.0971e-07 au
i 8.407088526168296 4.2402e-06 deg
node 237.0123328620695 2.68e-05 deg
peri 5.948398163106073 8.1293e-05 deg
M 194.2823671701194 7.9983e-05 deg
tp 2460066.754619974889
(2023-May-02.25461998)
0.00042179 TDB
period 1881.825475452543
5.15
1.6156e-05
4.423e-08
d
yr
n .1913036063630857 1.6424e-09 deg/d
Q 3.085005250437885 1.7657e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1597  
   data-arc span      14625 days (40.04 yr)  
   first obs. used      1981-02-02  
   last obs. used      2021-02-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49717  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:31  

Additional Information
 Earth MOID = 1.86676 au 
 Jupiter MOID = 1.91798 au 
 T_jup = 3.241 
[ 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 13.62   n/a E2021B10  

20974 (1981 EO2)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 EO2 = 1998 QW64 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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