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18741 (1998 WB6)
Classification: Main-belt Asteroid          SPK-ID: 2018741
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08846620489938034 3.3561e-08  
a 2.270673328014576 6.0627e-09 au
q 2.069795476118881 7.5645e-08 au
i 5.940408759169692 2.9313e-06 deg
node 243.7024850159319 3.3904e-05 deg
peri 250.9299769841405 3.8396e-05 deg
M 148.2316739084755 1.7027e-05 deg
tp 2458881.901012979176
(2020-Feb-02.40101298)
5.9375e-05 TDB
period 1249.770919013444
3.42
5.0054e-06
1.37e-08
d
yr
n .2880527899338385 1.1537e-09 deg/d
Q 2.471551179910271 6.5991e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2480  
   data-arc span      12891 days (35.29 yr)  
   first obs. used      1986-03-15  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44917  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:40:12  

Additional Information
 Earth MOID = 1.0936 au 
 Jupiter MOID = 2.57517 au 
 T_jup = 3.600 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457284.5 (2015-Sep-19.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08855371187701916 3.3681e-08  
q 2.069405564320518 7.6017e-08 au
tp 2457633.551894251686
(2016-Sep-02.05189425)
6.0148e-05 TDB
node 243.744288441315 3.3922e-05 deg
peri 251.1822784348882 3.8375e-05 deg
i 5.938591049372959 2.9308e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2480  
   data-arc span      12891 days (35.29 yr)  
   first obs. used      1986-03-15  
   last obs. used      2021-06-30  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44917  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 04:40:12  

Additional Information
 Jupiter MOID = 2.57517 au 
 T_jup = 3.600 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.134408241322905E-15 -2.55343561631401E-15 2.806379540449219E-13 6.028357219726876E-15 9.233040813910041E-14 -9.125419842532476E-16
q -2.55343561631401E-15 5.778555160350572E-15 -7.216683728925142E-13 -1.358766209155279E-14 -2.367808258541416E-13 2.086462796950272E-15
tp 2.806379540449219E-13 -7.216683728925142E-13 3.61780931303124E-9 3.53244232305344E-13 1.090807547563134E-9 9.753545788455883E-14
node 6.028357219726876E-15 -1.358766209155279E-14 3.53244232305344E-13 1.150683654265297E-9 -1.144216098073577E-9 5.226995548719514E-12
peri 9.233040813910041E-14 -2.367808258541416E-13 1.090807547563134E-9 -1.144216098073577E-9 1.472659024596809E-9 -5.175046399468556E-12
i -9.125419842532476E-16 2.086462796950272E-15 9.753545788455883E-14 5.226995548719514E-12 -5.175046399468556E-12 8.589394855291877E-12

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.06   n/a E2021B10  

18741 (1998 WB6)          Discovered 1998-Nov-18 by Ueda, S., Kaneda, H. at Kushiro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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