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216471 (1997 WK12)
Classification: Main-belt Asteroid          SPK-ID: 2216471
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .121417016648082 4.1999e-08  
a 2.214724346506721 7.7735e-09 au
q 1.945819123656002 9.4849e-08 au
i 5.761243563184234 4.6285e-06 deg
node 237.8210675696823 3.8103e-05 deg
peri 197.5790795934175 4.205e-05 deg
M 336.4816631371903 1.899e-05 deg
tp 2459279.146980356951
(2021-Mar-05.64698036)
6.3602e-05 TDB
period 1203.865438855687
3.30
6.3382e-06
1.735e-08
d
yr
n .2990367431281952 1.5744e-09 deg/d
Q 2.48362956935744 8.7174e-09 au
  Orbit Determination Parameters
   # obs. used (total)      406  
   data-arc span      8449 days (23.13 yr)  
   first obs. used      1997-11-23  
   last obs. used      2021-01-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5685  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 23:54:56  

Additional Information
 Earth MOID = .961075 au 
 Jupiter MOID = 2.74891 au 
 T_jup = 3.638 
[ 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 17.17   n/a E2021B55  

216471 (1997 WK12)          Discovered 1997-Nov-23 by Spacewatch at Kitt Peak
Reference: 20090707/Numbers.arcLast Updated: 2009-07-09

Alternate Designations
 1997 WK12 = 2005 AD57 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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