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21980 (1999 XA5)
Classification: Main-belt Asteroid          SPK-ID: 2021980
[ 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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08493793913505625 4.5415e-08  
a 2.952032523816868 1.6688e-08 au
q 2.701292964984205 1.3071e-07 au
i 2.290177500595865 3.9237e-06 deg
node 144.7108895770689 0.00011197 deg
peri 195.2958682441582 0.00011504 deg
M 126.0328812258074 2.7714e-05 deg
tp 2458551.923068294312
(2019-Mar-09.42306829)		 0.00014201 TDB
period 1852.59349102492
5.07		 1.571e-05
4.301e-08		 d
yr
n .194322176853183 1.6478e-09 deg/d
Q 3.202772082649532 1.8106e-08 au
   Orbit Determination Parameters
   # obs. used (total)      1210  
   data-arc span      8664 days (23.72 yr)  
   first obs. used      1997-04-30  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .56217  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:55:26  

Additional Information
 Earth MOID = 1.69065 au 
 Jupiter MOID = 2.12055 au 
 T_jup = 3.262 
[ 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 14.73   n/a E2021B10  
diameter diameter 3.623 km 0.650 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.162   0.100 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21980 (1999 XA5)          Discovered 1999-Dec-04 by CSS at Catalina
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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