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21794 (1999 SK8)
Classification: Main-belt Asteroid          SPK-ID: 2021794
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 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1367920084502921 4.741e-08  
a 2.573040667610235 1.1202e-08 au
q 2.221069266863551 1.2761e-07 au
i 14.01996109830968 7.0052e-06 deg
node 40.55313136734964 1.2056e-05 deg
peri 44.46833498028684 2.7598e-05 deg
M 323.5364590502862 2.4409e-05 deg
tp 2459353.194973916318
(2021-May-18.69497392)
0.00010256 TDB
period 1507.538466592775
4.13
9.8445e-06
2.695e-08
d
yr
n .2387998767379017 1.5594e-09 deg/d
Q 2.92501206835692 1.2734e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1941  
   data-arc span      15092 days (41.32 yr)  
   first obs. used      1979-11-14  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44258  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:53:30  

Additional Information
 Earth MOID = 1.2562 au 
 Jupiter MOID = 2.43774 au 
 T_jup = 3.374 
[ 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 13.96   n/a E2021B10  
diameter diameter 4.859 km 0.300 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.226   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21794 (1999 SK8)          Discovered 1999-Sep-29 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 SK8 = 1979 VS1 = 1983 VJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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