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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02096967817639517 3.4912e-08  
a 2.542673267233057 1.5464e-08 au
q 2.489354227111456 8.8256e-08 au
i 7.582185060395467 4.9931e-06 deg
node 139.5552878378014 2.9539e-05 deg
peri 279.2968736481738 0.00013374 deg
M 140.4908152721707 0.00012895 deg
tp 2458622.564071036858
(2019-May-19.06407104)
0.00053016 TDB
period 1480.929084393635
4.05
1.351e-05
3.699e-08
d
yr
n .2430906407293647 2.2176e-09 deg/d
Q 2.595992307354658 1.5788e-08 au
  Orbit Determination Parameters
   # obs. used (total)      392  
   data-arc span      6770 days (18.54 yr)  
   first obs. used      2002-10-04  
   last obs. used      2021-04-17  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5812  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 10:41:38  

Additional Information
 Earth MOID = 1.51299 au 
 Jupiter MOID = 2.45387 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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