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21026 (1989 SE4)
Classification: Main-belt Asteroid          SPK-ID: 2021026
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1884935948192819 4.1069e-08  
a 2.352850183324623 8.473e-09 au
q 1.909352994198559 9.6474e-08 au
i 5.605033392093539 4.8314e-06 deg
node 169.5656801469877 3.885e-05 deg
peri 228.7748833411917 4.0154e-05 deg
M 271.7856327164749 1.1177e-05 deg
tp 2459719.517953588337
(2022-May-20.01795359)
4.1698e-05 TDB
period 1318.225895313078
3.61
7.1207e-06
1.95e-08
d
yr
n .2730943165962464 1.4752e-09 deg/d
Q 2.796347372450688 1.007e-08 au
  Orbit Determination Parameters
   # obs. used (total)      697  
   data-arc span      11573 days (31.69 yr)  
   first obs. used      1989-09-26  
   last obs. used      2021-06-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48932  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 14:03:38  

Additional Information
 Earth MOID = .921151 au 
 Jupiter MOID = 2.63632 au 
 T_jup = 3.526 
[ 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 16.34   n/a E2021B10  

21026 (1989 SE4)          Discovered 1989-Sep-26 by Elst, E. W. at La Silla
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1989 SE4 = 2000 WP23 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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