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20221 (1997 HV8)
Classification: Main-belt Asteroid          SPK-ID: 2020221
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1005787175326967 4.5747e-08  
a 3.099663836234687 1.7999e-08 au
q 2.787903622803723 1.3546e-07 au
i 1.81459573107229 3.9368e-06 deg
node 64.28855285917336 0.00013653 deg
peri 118.8255901265755 0.00013798 deg
M 110.5190578352041 2.1098e-05 deg
tp 2458388.565421266426
(2018-Sep-27.06542127)
0.00011507 TDB
period 1993.289235894253
5.46
1.7361e-05
4.753e-08
d
yr
n .1806060021382158 1.5731e-09 deg/d
Q 3.41142404966565 1.9809e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1037  
   data-arc span      9491 days (25.98 yr)  
   first obs. used      1994-10-26  
   last obs. used      2020-10-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5769  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:04:06  

Additional Information
 Earth MOID = 1.79073 au 
 Jupiter MOID = 1.5454 au 
 T_jup = 3.214 
[ 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 14.6   n/a MPO266062  
diameter diameter 5.264 km 0.272 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.077   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20221 (1997 HV8)          Discovered 1997-Apr-30 by LINEAR at Socorro
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1997 HV8 = 1994 UZ4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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