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21796 (1999 SH11)
Classification: Main-belt Asteroid          SPK-ID: 2021796
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .189286718746785 4.3061e-08  
a 2.780755522027196 1.7298e-08 au
q 2.254395433625665 1.1847e-07 au
i 8.939300928690177 4.6151e-06 deg
node 70.25155337180612 3.0328e-05 deg
peri 225.2637609803072 3.2735e-05 deg
M 274.0864178555113 1.5498e-05 deg
tp 2459604.705264666488
(2022-Jan-25.20526467)
7.4507e-05 TDB
period 1693.723991571108
4.64
1.5804e-05
4.327e-08
d
yr
n .2125493892697723 1.9832e-09 deg/d
Q 3.307115610428728 2.0572e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1084  
   data-arc span      13131 days (35.95 yr)  
   first obs. used      1984-05-07  
   last obs. used      2020-04-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56241  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:54:55  

Additional Information
 Earth MOID = 1.24683 au 
 Jupiter MOID = 1.91662 au 
 T_jup = 3.289 
[ 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 14.55   n/a E2021B10  
diameter diameter 5.996 km 0.355 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.094   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21796 (1999 SH11)          Discovered 1999-Sep-30 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 SH11 = 1984 JO = 1998 KX33 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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