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21983 (1999 XB12)
Classification: Main-belt Asteroid          SPK-ID: 2021983
[ 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 .1154917720307037 4.5893e-08  
a 2.667540810192419 1.2435e-08 au
q 2.359461795059077 1.227e-07 au
i 11.78510957995092 4.0612e-06 deg
node 286.9434701533736 2.092e-05 deg
peri 222.5548711852658 2.5433e-05 deg
M 213.6356895614733 1.6062e-05 deg
tp 2459847.490234525267
(2022-Sep-24.99023453)		 7.3063e-05 TDB
period 1591.34753363882
4.36		 1.1127e-05
3.046e-08		 d
yr
n .2262233688054386 1.5818e-09 deg/d
Q 2.975619825325761 1.3871e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1812  
   data-arc span      12940 days (35.43 yr)  
   first obs. used      1985-08-16  
   last obs. used      2021-01-19  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42905  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:55:27  

Additional Information
 Earth MOID = 1.38601 au 
 Jupiter MOID = 2.12821 au 
 T_jup = 3.343 
[ 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 13.93   n/a E2021B10  
diameter diameter 4.911 km 0.187 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.184   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21983 (1999 XB12)          Discovered 1999-Dec-06 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XB12 = 1985 QZ1 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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