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JPL Small-Body Database Browser
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66957 (1999 XO21)
Classification: Main-belt Asteroid          SPK-ID: 2066957
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1463068893310472 6.0523e-08  
a 2.741934344334358 1.7533e-08 au
q 2.340770459664834 1.609e-07 au
i 6.610308452438574 5.929e-06 deg
node 165.0475079741824 4.2257e-05 deg
peri 200.2397171539712 4.4928e-05 deg
M 227.0499671512397 1.4992e-05 deg
tp 2459612.949031433071
(2022-Feb-02.44903143)
7.0932e-05 TDB
period 1658.379818278936
4.54
1.5906e-05
4.355e-08
d
yr
n .2170793421579427 2.0821e-09 deg/d
Q 3.143098229003882 2.0098e-08 au
  Orbit Determination Parameters
   # obs. used (total)      657  
   data-arc span      7112 days (19.47 yr)  
   first obs. used      1999-10-10  
   last obs. used      2019-03-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5272  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 07:25:16  

Additional Information
 Earth MOID = 1.33983 au 
 Jupiter MOID = 2.31448 au 
 T_jup = 3.324 
[ 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 15.2   n/a MPO385243  

66957 (1999 XO21)          Discovered 1999-Dec-05 by LINEAR at Socorro
Reference: 20030910/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XO21 = 2001 DT53 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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