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21797 (1999 SW11)
Classification: Main-belt Asteroid          SPK-ID: 2021797
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09154701445400436 3.025e-08  
a 2.350478605005144 6.9753e-09 au
q 2.13529930617891 7.2572e-08 au
i 6.883760195952735 3.1968e-06 deg
node 62.2712946141125 2.6989e-05 deg
peri 338.5836940021693 3.2272e-05 deg
M 305.9204332434136 1.759e-05 deg
tp 2459398.225910212533
(2021-Jul-02.72591021)
6.4525e-05 TDB
period 1316.233319636247
3.60
5.8591e-06
1.604e-08
d
yr
n .2735077395696754 1.2175e-09 deg/d
Q 2.565657903831378 7.6138e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2009  
   data-arc span      14286 days (39.11 yr)  
   first obs. used      1981-10-24  
   last obs. used      2020-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47173  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:54:27  

Additional Information
 Earth MOID = 1.1446 au 
 Jupiter MOID = 2.76428 au 
 T_jup = 3.543 
[ 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 14.33   n/a E2021B10  

21797 (1999 SW11)          Discovered 1999-Sep-30 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 SW11 = 1981 US17 = 1990 DF7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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