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187845 (1999 XW109)
Classification: Main-belt Asteroid          SPK-ID: 2187845
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2196063950774887 5.0152e-08  
a 3.077898077240814 2.0978e-08 au
q 2.401971976082025 1.5942e-07 au
i 6.799546621176352 4.2027e-06 deg
node 90.38393009465584 4.8616e-05 deg
peri 304.1491215156606 5.0056e-05 deg
M 341.1196431553597 1.1535e-05 deg
tp 2459303.939753262498
(2021-Mar-30.43975326)		 6.3601e-05 TDB
period 1972.330898240961
5.40		 2.0164e-05
5.521e-08		 d
yr
n .182525153523209 1.866e-09 deg/d
Q 3.753824178399602 2.5584e-08 au
   Orbit Determination Parameters
   # obs. used (total)      437  
   data-arc span      7667 days (20.99 yr)  
   first obs. used      1999-10-20  
   last obs. used      2020-10-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5343  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 21:57:04  

Additional Information
 Earth MOID = 1.41597 au 
 Jupiter MOID = 1.70926 au 
 T_jup = 3.181 
[ 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 15.63   n/a E2021B55  

187845 (1999 XW109)          Discovered 1999-Dec-04 by CSS at Catalina
Reference: 20080618/Numbers.arcLast Updated: 2008-06-20

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