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305509 (2008 ET146)
Classification: Main-belt Asteroid          SPK-ID: 2305509
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04151513523048981 6.6321e-08  
a 3.093300984785871 4.8759e-08 au
q 2.964882176093878 1.8686e-07 au
i 11.20827982183543 6.895e-06 deg
node 104.8958222731141 3.752e-05 deg
peri 14.5473757273076 0.00010477 deg
M 142.2445548505529 0.00010306 deg
tp 2458215.327923109904
(2018-Apr-06.82792311)
0.00056088 TDB
period 1987.154784078793
5.44
4.6984e-05
1.286e-07
d
yr
n .1811635424096514 4.2834e-09 deg/d
Q 3.221719793477864 5.0783e-08 au
  Orbit Determination Parameters
   # obs. used (total)      154  
   data-arc span      6760 days (18.51 yr)  
   first obs. used      2000-11-27  
   last obs. used      2019-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66585  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 05:54:48  

Additional Information
 Earth MOID = 1.98251 au 
 Jupiter MOID = 1.87526 au 
 T_jup = 3.193 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456890.5 (2014-Aug-21.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04335369973953621 6.6011e-08  
q 2.956076350039912 1.8744e-07 au
tp 2456218.878946145947
(2012-Oct-18.37894615)
0.00052173 TDB
node 104.9212381889098 3.7547e-05 deg
peri 12.16911078977157 0.00010143 deg
i 11.20759457184824 6.8954e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      154  
   data-arc span      6760 days (18.51 yr)  
   first obs. used      2000-11-27  
   last obs. used      2019-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .66585  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 05:54:48  

Additional Information
 Jupiter MOID = 1.87526 au 
 T_jup = 3.193 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.357495394937423E-15 -1.205382182774446E-14 3.810255146941547E-12 -1.196469261775364E-15 7.329186070882885E-13 -2.226584229027373E-15
q -1.205382182774446E-14 3.513290917643488E-14 -2.842251120811797E-12 1.797333574823769E-14 -5.723652231828649E-13 8.754860076607981E-15
tp 3.810255146941547E-12 -2.842251120811797E-12 2.722057954198898E-7 1.492284459162958E-10 4.923311439729827E-8 -1.032163049910208E-11
node -1.196469261775364E-15 1.797333574823769E-14 1.492284459162958E-10 1.409773429066569E-9 -1.35473309683309E-9 -3.472477171946345E-11
peri 7.329186070882885E-13 -5.723652231828649E-13 4.923311439729827E-8 -1.35473309683309E-9 1.028791694105293E-8 3.223503566783869E-11
i -2.226584229027373E-15 8.754860076607981E-15 -1.032163049910208E-11 -3.472477171946345E-11 3.223503566783869E-11 4.7547042112398E-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 15.8   n/a MPO476361  

305509 (2008 ET146)          Discovered 2008-Mar-10 by CSS at Catalina
Reference: 20111110/Numbers.arcLast Updated: 2011-11-14

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