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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 ]

[ show orbit diagram ]
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457670.5 (2016-Oct-09.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2265852285143139 5.1509e-08  
q 2.376126478180779 1.6535e-07 au
tp 2457323.186876268516
(2015-Oct-27.68687627)
5.149e-05 TDB
node 90.60074335139862 4.8974e-05 deg
peri 302.8036444565854 5.0141e-05 deg
i 6.786003378918288 4.1962e-06 deg
  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
 Jupiter MOID = 1.70926 au 
 T_jup = 3.181 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.653209351469386E-15 -8.480387555011219E-15 -7.518048776832349E-13 3.480175722826881E-15 -1.39178739505374E-13 -5.365538910952182E-15
q -8.480387555011219E-15 2.733954088855928E-14 2.436629623580287E-12 -1.11504523657316E-14 4.614297508829085E-13 1.811018182615795E-14
tp -7.518048776832349E-13 2.436629623580287E-12 2.651184866586329E-9 -7.27885751522541E-12 6.011190694867852E-10 3.757561440479665E-12
node 3.480175722826881E-15 -1.11504523657316E-14 -7.27885751522541E-12 2.39845521768483E-9 -2.38320253762469E-9 -2.394444215149985E-11
peri -1.39178739505374E-13 4.614297508829085E-13 6.011190694867852E-10 -2.38320253762469E-9 2.514161684984709E-9 2.454441218749549E-11
i -5.365538910952182E-15 1.811018182615795E-14 3.757561440479665E-12 -2.394444215149985E-11 2.454441218749549E-11 1.760805472539166E-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 15.63   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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