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20988 (1981 EC43)
Classification: Main-belt Asteroid          SPK-ID: 2020988
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1910341615273256 3.546e-08  
a 2.288964799154095 8.3716e-09 au
q 1.851694327982129 8.1839e-08 au
i 5.098642231333633 3.9493e-06 deg
node 188.57709904589 3.938e-05 deg
peri 132.816860534569 4.0463e-05 deg
M 352.7789416463278 1.1707e-05 deg
tp 2459025.872043747570
(2020-Jun-25.37204375)
4.1223e-05 TDB
period 1264.902636395442
3.46
6.9394e-06
1.9e-08
d
yr
n .2846068856539677 1.5614e-09 deg/d
Q 2.726235270326061 9.9709e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1578  
   data-arc span      13953 days (38.20 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52207  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:07  

Additional Information
 Earth MOID = .843955 au 
 Jupiter MOID = 2.60568 au 
 T_jup = 3.570 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456406.5 (2013-Apr-24.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1908847649329507 3.5393e-08  
q 1.851852012117408 8.1675e-08 au
tp 2456494.908847960301
(2013-Jul-21.40884796)
3.4082e-05 TDB
node 188.7166647209434 3.9473e-05 deg
peri 132.3822155988683 4.0547e-05 deg
i 5.091725891297179 3.9451e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1578  
   data-arc span      13953 days (38.20 yr)  
   first obs. used      1981-02-12  
   last obs. used      2019-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52207  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 23:48:07  

Additional Information
 Jupiter MOID = 2.60568 au 
 T_jup = 3.570 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.252677419970547E-15 -2.88097943808382E-15 7.451860747787377E-14 -1.046499652719568E-14 4.257731315553496E-14 -4.846991032113781E-16
q -2.88097943808382E-15 6.670744292165351E-15 -8.152110618462977E-14 2.360703973793516E-14 -7.557823412993007E-14 1.183371214102615E-15
tp 7.451860747787377E-14 -8.152110618462977E-14 1.161566935004343E-9 -3.980484933354182E-12 3.25764593639424E-10 -6.779864737373521E-13
node -1.046499652719568E-14 2.360703973793516E-14 -3.980484933354182E-12 1.558131725133479E-9 -1.552799253060458E-9 -2.452762219937507E-11
peri 4.257731315553496E-14 -7.557823412993007E-14 3.25764593639424E-10 -1.552799253060458E-9 1.644049769659881E-9 2.422505849294907E-11
i -4.846991032113781E-16 1.183371214102615E-15 -6.779864737373521E-13 -2.452762219937507E-11 2.422505849294907E-11 1.556401553912795E-11

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 14.8   n/a MPO474041  

20988 (1981 EC43)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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