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216338 (2007 WD21)
Classification: Main-belt Asteroid          SPK-ID: 2216338
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02104677521115149 3.4669e-08  
a 2.542413621035171 1.4183e-08 au
q 2.488904013059474 8.8167e-08 au
i 7.582226925862913 4.0313e-06 deg
node 139.5561787567417 2.9111e-05 deg
peri 278.9699703937975 0.00010786 deg
M 188.4771836210936 0.00010476 deg
tp 2460101.983945590982
(2023-Jun-06.48394559)
0.00043322 TDB
period 1480.702251598447
4.05
1.239e-05
3.392e-08
d
yr
n .2431278804441427 2.0344e-09 deg/d
Q 2.595923229010868 1.4481e-08 au
  Orbit Determination Parameters
   # obs. used (total)      428  
   data-arc span      6851 days (18.76 yr)  
   first obs. used      2002-10-04  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56558  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 03:33:40  

Additional Information
 Earth MOID = 1.51289 au 
 Jupiter MOID = 2.45379 au 
 T_jup = 3.432 
[ 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 16.75   n/a E2021B55  

216338 (2007 WD21)          Discovered 2007-Nov-18 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20090607/Numbers.arcLast Updated: 2009-06-08

Alternate Designations
 2007 WD21 = 2002 TK311 = 2004 DR57 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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