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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 ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1463068808471794 5.6462e-08  
a 2.74193433180693 1.6092e-08 au
q 2.340770472232463 1.5154e-07 au
i 6.610310002985389 5.6737e-06 deg
node 165.0474995580997 4.1724e-05 deg
peri 200.2397602945692 4.4046e-05 deg
M 227.0499431787757 1.4712e-05 deg
tp 2459612.949137667616
(2022-Feb-02.44913767)
6.998e-05 TDB
period 1658.379806913656
4.54
1.4599e-05
3.997e-08
d
yr
n .2170793436456402 1.911e-09 deg/d
Q 3.143098191381397 1.8446e-08 au
  Orbit Determination Parameters
   # obs. used (total)      707  
   data-arc span      7505 days (20.55 yr)  
   first obs. used      1999-10-10  
   last obs. used      2020-04-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51452  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 13:05:31  

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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