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71211 (1999 XO257)
Classification: Main-belt Asteroid          SPK-ID: 2071211
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ 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 .09624261630942653 4.8822e-08  
a 2.606653217463187 1.5464e-08 au
q 2.355782092003145 1.2421e-07 au
i 10.1568051248022 5.2997e-06 deg
node 69.54863898572582 2.4793e-05 deg
peri 12.79735481046206 3.3531e-05 deg
M 311.2898003745441 2.3897e-05 deg
tp 2459208.489170022565
(2020-Dec-24.98917002)
0.00010265 TDB
period 1537.175002029619
4.21
1.3679e-05
3.745e-08
d
yr
n .2341958459672266 2.084e-09 deg/d
Q 2.857524342923228 1.6952e-08 au
  Orbit Determination Parameters
   # obs. used (total)      791  
   data-arc span      6743 days (18.46 yr)  
   first obs. used      1999-12-07  
   last obs. used      2018-05-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52452  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-May-31 15:18:55  

Additional Information
 Earth MOID = 1.37247 au 
 Jupiter MOID = 2.37399 au 
 T_jup = 3.383 
[ 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 14.9   n/a MPO347978  

71211 (1999 XO257)          Discovered 1999-Dec-07 by LINEAR at Socorro
Reference: 20031109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XO257 = 2001 FW21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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