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21969 (1999 WJ17)
Classification: Main-belt Asteroid          SPK-ID: 2021969
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06654511753469156 3.3375e-08  
a 2.331398527023367 6.7512e-09 au
q 2.17625533802239 7.7103e-08 au
i 6.045248908987428 3.1073e-06 deg
node 222.1815610583983 3.2055e-05 deg
peri 288.3248803268032 3.8806e-05 deg
M 213.9589972775221 2.2541e-05 deg
tp 2459727.967261011887
(2022-May-28.46726101)
8.2167e-05 TDB
period 1300.239045366761
3.56
5.6478e-06
1.546e-08
d
yr
n .2768721653782164 1.2026e-09 deg/d
Q 2.486541716024344 7.2004e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1849  
   data-arc span      14355 days (39.30 yr)  
   first obs. used      1981-10-01  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4853  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:55:21  

Additional Information
 Earth MOID = 1.1948 au 
 Jupiter MOID = 2.51643 au 
 T_jup = 3.560 
[ 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 14.83   n/a E2021B10  

21969 (1999 WJ17)          Discovered 1999-Nov-30 by Spacewatch at Kitt Peak
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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