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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03474926375956848 4.1304e-08  
a 2.981559715938792 1.843e-08 au
q 2.877952710954731 1.2021e-07 au
i 8.408771889795888 4.8077e-06 deg
node 237.0095429389585 3.8379e-05 deg
peri 5.674450180008011 9.6196e-05 deg
M 79.70691492354548 8.965e-05 deg
tp 2458184.151318099829
(2018-Mar-06.65131810)
0.00046745 TDB
period 1880.458246663181
5.15
1.7436e-05
4.774e-08
d
yr
n .1914426978843107 1.7751e-09 deg/d
Q 3.085166720922853 1.9071e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1252  
   data-arc span      14179 days (38.82 yr)  
   first obs. used      1981-02-02  
   last obs. used      2019-11-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52262  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:48:03  

Additional Information
 Earth MOID = 1.86507 au 
 Jupiter MOID = 1.91931 au 
 T_jup = 3.242 
[ 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 13.6   n/a MPO400211  

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

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