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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 | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1886702750047355 4.3022e-08  
a 2.352016593022992 8.7691e-09 au
q 1.908260975601643 1.0077e-07 au
i 5.604812887886864 5.1881e-06 deg
node 169.576930074804 3.9288e-05 deg
peri 228.8687381725788 4.0689e-05 deg
M 218.1330157078162 1.1556e-05 deg
tp 2459719.703767204984
(2022-May-20.20376721)
4.3552e-05 TDB
period 1317.525406819352
3.61
7.3683e-06
2.017e-08
d
yr
n .2732395126019457 1.5281e-09 deg/d
Q 2.795772210444341 1.0424e-08 au
  Orbit Determination Parameters
   # obs. used (total)      689  
   data-arc span      11247 days (30.79 yr)  
   first obs. used      1989-09-26  
   last obs. used      2020-07-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49073  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:59:20  

Additional Information
 Earth MOID = .91967 au 
 Jupiter MOID = 2.63555 au 
 T_jup = 3.526 
[ 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 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

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