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20976 (1981 EA6)
Classification: Main-belt Asteroid          SPK-ID: 2020976
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05653602213024628 4.5523e-08  
a 3.090036637119747 2.6045e-08 au
q 2.915338257420274 1.5129e-07 au
i 6.214823265455384 5.5817e-06 deg
node 258.4838656791624 4.4134e-05 deg
peri 84.40988545614836 6.7203e-05 deg
M 313.5004672797456 5.1219e-05 deg
tp 2459456.765390817326
(2021-Aug-30.26539082)
0.00028283 TDB
period 1984.010059826956
5.43
2.5084e-05
6.868e-08
d
yr
n .1814506928616073 2.2941e-09 deg/d
Q 3.264735016819221 2.7517e-08 au
  Orbit Determination Parameters
   # obs. used (total)      610  
   data-arc span      14440 days (39.53 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-08-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .58321  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:33  

Additional Information
 Earth MOID = 1.91389 au 
 Jupiter MOID = 1.99094 au 
 T_jup = 3.214 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.61   n/a E2021B10  
diameter diameter 7.522 km 0.197 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.059   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20976 (1981 EA6)          Discovered 1981-Mar-07 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 EA6 = 1997 ER59 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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