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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2067142912199733 4.2787e-08  
a 2.473196046183229 1.1504e-08 au
q 1.961951078448422 1.1011e-07 au
i 2.39290402012665 4.5409e-06 deg
node 182.8669847362484 8.6965e-05 deg
peri 210.8828613546209 8.7532e-05 deg
M 309.7003835949703 1.0509e-05 deg
tp 2459198.994471147761
(2020-Dec-15.49447115)		 4.1788e-05 TDB
period 1420.647208077887
3.89		 9.9125e-06
2.714e-08		 d
yr
n .2534056294574881 1.7681e-09 deg/d
Q 2.984441013918035 1.3883e-08 au
   Orbit Determination Parameters
   # obs. used (total)      912  
   data-arc span      8328 days (22.80 yr)  
   first obs. used      1997-11-30  
   last obs. used      2020-09-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53666  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 20:15:29  

Additional Information
 Earth MOID = .968697 au 
 Jupiter MOID = 2.44939 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 15.5   n/a MPO436583  

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

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