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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 | 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 .2515261830746121 4.0929e-08  
a 2.612674997153338 1.0321e-08 au
q 1.955518827504886 1.0985e-07 au
i 6.646493540083103 3.2858e-06 deg
node 71.70859349950804 3.7774e-05 deg
peri 273.1367501090888 3.8562e-05 deg
M 16.91794504551238 6.1043e-06 deg
tp 2459128.011081595292
(2020-Oct-05.51108160)
2.6202e-05 TDB
period 1542.504751935986
4.22
9.14e-06
2.502e-08
d
yr
n .2333866391971672 1.3829e-09 deg/d
Q 3.269831166801791 1.2917e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1446  
   data-arc span      9213 days (25.22 yr)  
   first obs. used      1995-10-23  
   last obs. used      2021-01-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51704  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 02:55:22  

Additional Information
 Earth MOID = .960248 au 
 Jupiter MOID = 2.18785 au 
 T_jup = 3.354 
[ 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 14.61   n/a E2021B10  

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

[ show close-approach data ]
Alternate Designations
 1999 XU = 1995 UJ49 = 1996 CB9 = 1998 HT71 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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