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JPL Small-Body Database Browser
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266581 (2008 HG20)
Classification: Main-belt Asteroid          SPK-ID: 2266581
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0625618074415849 5.7899e-08  
a 3.164841205904535 5.7158e-08 au
q 2.966843019797542 1.9725e-07 au
i 10.44736359981071 6.9384e-06 deg
node 29.35201736506286 3.5756e-05 deg
peri 267.7456634787624 6.7229e-05 deg
M 260.0028078114121 5.7955e-05 deg
tp 2459171.730803182349
(2020-Nov-18.23080318)
0.00033647 TDB
period 2056.488633779004
5.63
5.5711e-05
1.525e-07
d
yr
n .1750556721232463 4.7423e-09 deg/d
Q 3.362839392011527 6.0734e-08 au
  Orbit Determination Parameters
   # obs. used (total)      183  
   data-arc span      7149 days (19.57 yr)  
   first obs. used      1999-10-10  
   last obs. used      2019-05-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56953  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 08:50:50  

Additional Information
 Earth MOID = 1.97559 au 
 Jupiter MOID = 1.79521 au 
 T_jup = 3.175 
[ 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 15.7   n/a MPO433731  
diameter diameter 5.120 km 0.404 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.032   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

266581 (2008 HG20)          Discovered 2008-Apr-26 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20110218/Numbers.arcLast Updated: 2011-02-22

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