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21981 (1999 XX5)
Classification: Main-belt Asteroid          SPK-ID: 2021981
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 .09014381965660999 1.5372e-08  
a 2.76041789785648 1.1027e-08 au
q 2.511583284695227 4.1077e-08 au
i 5.93589603421535 4.3097e-07 deg
node 54.69540031019309 8.1958e-06 deg
peri 144.0476799531681 1.413e-05 deg
M 88.25687229562148 9.6693e-06 deg
tp 2458789.817014435611
(2019-Nov-02.31701444)
4.4382e-05 TDB
period 1675.176912093166
4.59
1.0038e-05
2.748e-08
d
yr
n .2149026752942607 1.2877e-09 deg/d
Q 3.009252511017733 1.2021e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2159  
   data-arc span      8497 days (23.26 yr)  
   first obs. used      1997-06-03  
   last obs. used      2020-09-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48774  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:56:55  

Additional Information
 Earth MOID = 1.51063 au 
 Jupiter MOID = 1.95121 au 
 T_jup = 3.328 
[ 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 13.4   n/a MPO337444  
diameter diameter 5.371 km 0.089 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.293   0.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21981 (1999 XX5)          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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