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312437 (2008 HW22)
Classification: Main-belt Asteroid          SPK-ID: 2312437
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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .202343117252794 6.1897e-08  
a 2.695738062752141 1.7198e-08 au
q 2.150274019837865 1.6483e-07 au
i 2.010456576772379 6.0761e-06 deg
node 336.7789649754695 0.00021192 deg
peri 201.9057376270816 0.00021284 deg
M 281.8183852591764 2.2348e-05 deg
tp 2459351.588899308178
(2021-May-17.08889931)
0.00010269 TDB
period 1616.646115201645
4.43
1.5471e-05
4.236e-08
d
yr
n .2226832431753916 2.131e-09 deg/d
Q 3.241202105666418 2.0678e-08 au
  Orbit Determination Parameters
   # obs. used (total)      172  
   data-arc span      7565 days (20.71 yr)  
   first obs. used      1999-03-10  
   last obs. used      2019-11-25  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66031  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 21:32:31  

Additional Information
 Earth MOID = 1.15419 au 
 Jupiter MOID = 1.72529 au 
 T_jup = 3.339 
[ 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 16.9   n/a MPO455303  

312437 (2008 HW22)          Discovered 2008-Apr-27 by Spacewatch at Kitt Peak
Reference: 20120109/Numbers.arcLast Updated: 2012-01-11

[ show close-approach data ]
Alternate Designations
 2008 HW22 = 1999 FP87 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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