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20977 (1981 EN7)
Classification: Main-belt Asteroid          SPK-ID: 2020977
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09249951628216224 6.3432e-08  
a 2.988106071895261 1.8465e-08 au
q 2.711707705645158 1.9225e-07 au
i 9.280366912935728 6.7084e-06 deg
node 328.5175739277995 2.406e-05 deg
peri 26.81830581505094 3.3238e-05 deg
M 72.39093880614102 2.1019e-05 deg
tp 2458821.120246542329
(2019-Dec-03.62024654)
0.00011034 TDB
period 1886.654787148242
5.17
1.7488e-05
4.788e-08
d
yr
n .1908139223202328 1.7687e-09 deg/d
Q 3.264504438145365 2.0173e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1475  
   data-arc span      14636 days (40.07 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4968  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:35:34  

Additional Information
 Earth MOID = 1.70782 au 
 Jupiter MOID = 2.14784 au 
 T_jup = 3.231 
[ 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 13.8   n/a MPO502323  

20977 (1981 EN7)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1981 EN7 = 1998 MY33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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