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21984 (1999 XC12)
Classification: Main-belt Asteroid          SPK-ID: 2021984
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04515335487770485 4.0751e-08  
a 3.014302231917371 1.6817e-08 au
q 2.878196373530948 1.1924e-07 au
i 9.702937569563158 3.9889e-06 deg
node 339.6372621352403 2.0928e-05 deg
peri 342.6156404724059 4.7712e-05 deg
M 93.29154742675982 4.1995e-05 deg
tp 2458705.142873312393
(2019-Aug-09.64287331)
0.00022367 TDB
period 1911.519001735271
5.23
1.5997e-05
4.38e-08
d
yr
n .1883318971316492 1.5761e-09 deg/d
Q 3.150408090303794 1.7576e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1689  
   data-arc span      9984 days (27.33 yr)  
   first obs. used      1993-09-18  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49518  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:55:27  

Additional Information
 Earth MOID = 1.86593 au 
 Jupiter MOID = 2.07543 au 
 T_jup = 3.225 
[ 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 13.62   n/a E2021B10  

21984 (1999 XC12)          Discovered 1999-Dec-06 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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