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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457128.5 (2015-Apr-16.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2331216672963205 4.5736e-08  
q 1.658601639749931 9.787e-08 au
tp 2457151.695784849375
(2015-May-09.19578485)
3.1813e-05 TDB
node 119.8647409196479 6.7442e-05 deg
peri 217.8824146136575 6.796e-05 deg
i 3.646444924796521 3.235e-06 deg
  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
 Jupiter MOID = 2.72256 au 
 T_jup = 3.657 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.091751037375924E-15 -4.472124589807111E-15 9.186691542328309E-13 -1.239996993025927E-14 2.220536152507934E-13 -2.469370531088479E-15
q -4.472124589807111E-15 9.578489380229032E-15 -1.951979783316826E-12 2.649614457775013E-14 -4.719379365664288E-13 5.268884066204928E-15
tp 9.186691542328309E-13 -1.951979783316826E-12 1.012047884140931E-9 -9.909871435221824E-12 2.860247850702196E-10 -2.104277286407775E-12
node -1.239996993025927E-14 2.649614457775013E-14 -9.909871435221824E-12 4.548375937217476E-9 -4.541635336545531E-9 4.194853132041268E-11
peri 2.220536152507934E-13 -4.719379365664288E-13 2.860247850702196E-10 -4.541635336545531E-9 4.618593503547342E-9 -4.241799404894219E-11
i -2.469370531088479E-15 5.268884066204928E-15 -2.104277286407775E-12 4.194853132041268E-11 -4.241799404894219E-11 1.046525574800959E-11

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

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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