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21972 (1999 XU)
Classification: Main-belt Asteroid          SPK-ID: 2021972
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2515133611386784 4.0644e-08  
a 2.612880128083265 1.0204e-08 au
q 1.955705864816583 1.0899e-07 au
i 6.646286114381734 3.2829e-06 deg
node 71.70878171600549 3.7596e-05 deg
peri 273.1628505955788 3.8386e-05 deg
M 62.64070610942869 6.0799e-06 deg
tp 2459128.069537547202
(2020-Oct-05.56953755)
2.6194e-05 TDB
period 1542.686417266645
4.22
9.0372e-06
2.474e-08
d
yr
n .2333591558016395 1.367e-09 deg/d
Q 3.270054391349948 1.2771e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1477  
   data-arc span      9244 days (25.31 yr)  
   first obs. used      1995-10-23  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51506  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 18:38:23  

Additional Information
 Earth MOID = .961408 au 
 Jupiter MOID = 2.18782 au 
 T_jup = 3.354 
[ 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 14.61   n/a E2021B10  

21972 (1999 XU)          Discovered 1999-Dec-02 by LINEAR at Socorro
Reference: 20010208/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XU = 1995 UJ49 = 1996 CB9 = 1998 HT71 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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