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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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02104677459883976 3.4633e-08  
a 2.542413620583182 1.4103e-08 au
q 2.488904014173748 8.8128e-08 au
i 7.582227325848644 3.9161e-06 deg
node 139.5561798707157 2.8981e-05 deg
peri 278.9699754170287 0.00010599 deg
M 188.4771777713552 0.00010304 deg
tp 2460101.983969463187
(2023-Jun-06.48396946)
0.00042632 TDB
period 1480.702251203589
4.05
1.2321e-05
3.373e-08
d
yr
n .2431278805089774 2.023e-09 deg/d
Q 2.595923226992617 1.44e-08 au
  Orbit Determination Parameters
   # obs. used (total)      436  
   data-arc span      6874 days (18.82 yr)  
   first obs. used      2002-10-04  
   last obs. used      2021-07-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56279  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 19:40:56  

Additional Information
 Earth MOID = 1.51289 au 
 Jupiter MOID = 2.45379 au 
 T_jup = 3.432 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457656.5 (2016-Sep-25.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01978925728332467 3.4552e-08  
q 2.493950470683681 8.7595e-08 au
tp 2457147.783420195013
(2015-May-05.28342019)
0.00044426 TDB
node 139.5988451988652 2.8967e-05 deg
peri 281.0185436129207 0.0001124 deg
i 7.582465973027816 3.9164e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      436  
   data-arc span      6874 days (18.82 yr)  
   first obs. used      2002-10-04  
   last obs. used      2021-07-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56279  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 19:40:56  

Additional Information
 Jupiter MOID = 2.45379 au 
 T_jup = 3.432 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.193832101866695E-15 -2.989045542547796E-15 -8.062326773654882E-15 8.374684145057019E-15 -1.719154833346486E-14 2.29238728796212E-15
q -2.989045542547796E-15 7.672876412603094E-15 2.26846764156609E-12 -2.244244939583342E-14 6.044416544333704E-13 -5.34793927793092E-15
tp -8.062326773654882E-15 2.26846764156609E-12 1.973681961821658E-7 -1.615695144404695E-10 4.825971465461139E-8 8.427535271992266E-12
node 8.374684145057019E-15 -2.244244939583342E-14 -1.615695144404695E-10 8.390694098767963E-10 -8.709959215430546E-10 3.267988792019749E-13
peri -1.719154833346486E-14 6.044416544333704E-13 4.825971465461139E-8 -8.709959215430546E-10 1.263311643670833E-8 1.734178185674E-12
i 2.29238728796212E-15 -5.34793927793092E-15 8.427535271992266E-12 3.267988792019749E-13 1.734178185674E-12 1.533827486889853E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.76   n/a MPO638138  

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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