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21793 (1999 SG8)
Classification: Main-belt Asteroid          SPK-ID: 2021793
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1481722775911702 4.7117e-08  
a 3.053103776690268 1.9744e-08 au
q 2.600718436375867 1.5322e-07 au
i 10.02283974725724 4.1103e-06 deg
node 103.9717970398355 2.2369e-05 deg
peri 272.3745446985584 2.6257e-05 deg
M 333.0835113840026 1.4735e-05 deg
tp 2459346.188972128504
(2021-May-11.68897213)
8.039e-05 TDB
period 1948.546510449722
5.33
1.8902e-05
5.175e-08
d
yr
n .1847530957405336 1.7922e-09 deg/d
Q 3.505489117004668 2.267e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1255  
   data-arc span      9049 days (24.77 yr)  
   first obs. used      1996-01-12  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51861  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 01:54:56  

Additional Information
 Earth MOID = 1.62533 au 
 Jupiter MOID = 2.0638 au 
 T_jup = 3.196 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.91   n/a E2021B10  
diameter diameter 10.942 km 0.138 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.037   0.003 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21793 (1999 SG8)          Discovered 1999-Sep-29 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 SG8 = 2000 WS60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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