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120751 (1997 WH21)
Classification: Main-belt Asteroid          SPK-ID: 2120751
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .206617919153125 4.1854e-08  
a 2.472659878711492 1.0177e-08 au
q 1.961764039798705 1.0699e-07 au
i 2.393174824888017 4.4222e-06 deg
node 182.864628836189 6.3105e-05 deg
peri 210.9415302466632 6.3816e-05 deg
M .3449866331959778 8.0845e-06 deg
tp 2459199.139041860097
(2020-Dec-15.63904186)
3.1894e-05 TDB
period 1420.185257110403
3.89
8.7675e-06
2.4e-08
d
yr
n .2534880560107196 1.5649e-09 deg/d
Q 2.983555717624279 1.2279e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1226  
   data-arc span      8444 days (23.12 yr)  
   first obs. used      1997-11-30  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5067  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 09:25:50  

Additional Information
 Earth MOID = .9674 au 
 Jupiter MOID = 2.45122 au 
 T_jup = 3.452 
[ 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 15.63   n/a E2021B55  

120751 (1997 WH21)          Discovered 1997-Nov-30 by Kobayashi, T. at Oizumi
Reference: 20060314/Numbers.arcLast Updated: 2006-03-23

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