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49952 (1999 XH212)
Classification: Mars-crossing Asteroid          SPK-ID: 2049952
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2324255122783403 4.5606e-08  
a 2.162755315198635 5.6379e-09 au
q 1.660075803130889 9.7522e-08 au
i 3.645687229906982 3.2333e-06 deg
node 119.8073788005522 6.7467e-05 deg
peri 218.0579163725179 6.7991e-05 deg
M 212.610995932336 1.0712e-05 deg
tp 2459476.133124318614
(2021-Sep-18.63312432)
3.5439e-05 TDB
period 1161.741514150493
3.18
4.5426e-06
1.244e-08
d
yr
n .3098796036941531 1.2117e-09 deg/d
Q 2.665434827266381 6.9483e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1217  
   data-arc span      9128 days (24.99 yr)  
   first obs. used      1995-04-22  
   last obs. used      2020-04-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51062  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 09:58:18  

Additional Information
 Earth MOID = .652617 au 
 Jupiter MOID = 2.72256 au 
 T_jup = 3.657 
[ 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 15.7   n/a MPO459192  

49952 (1999 XH212)          Discovered 1999-Dec-14 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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