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181791 (1998 EX9)
Classification: Main-belt Asteroid          SPK-ID: 2181791
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1216429842060647 5.9061e-08  
a 2.202215782999975 9.0286e-09 au
q 1.934331683290163 1.3134e-07 au
i 4.510863646754225 6.7981e-06 deg
node 176.5481343988634 5.5806e-05 deg
peri 46.3083623667378 6.0683e-05 deg
M 308.2152331795348 2.1101e-05 deg
tp 2459372.206903899078
(2021-Jun-06.70690390)
6.9784e-05 TDB
period 1193.680867927345
3.27
7.3407e-06
2.01e-08
d
yr
n .3015881461056573 1.8547e-09 deg/d
Q 2.470099882709787 1.0127e-08 au
  Orbit Determination Parameters
   # obs. used (total)      367  
   data-arc span      8455 days (23.15 yr)  
   first obs. used      1998-03-08  
   last obs. used      2021-05-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57947  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 10:09:50  

Additional Information
 Earth MOID = .928145 au 
 Jupiter MOID = 2.50295 au 
 T_jup = 3.650 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457655.5 (2016-Sep-24.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1219537786663119 5.9062e-08  
q 1.933466204285292 1.3133e-07 au
tp 2458179.016539985741
(2018-Mar-01.51653999)
7.1211e-05 TDB
node 176.5753487379926 5.5788e-05 deg
peri 46.41374070000217 6.0656e-05 deg
i 4.511651141658548 6.8002e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      367  
   data-arc span      8455 days (23.15 yr)  
   first obs. used      1998-03-08  
   last obs. used      2021-05-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .57947  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 10:09:50  

Additional Information
 Jupiter MOID = 2.50295 au 
 T_jup = 3.650 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.488321773444692E-15 -7.742675966233912E-15 -1.546149327343115E-12 3.617142922710138E-14 -4.947391903486054E-13 -4.162045228777928E-16
q -7.742675966233912E-15 1.72474501695547E-14 3.252072586141527E-12 -7.944991545771479E-14 1.032790955347747E-12 1.086486450436375E-15
tp -1.546149327343115E-12 3.252072586141527E-12 5.070959518588331E-9 -3.099323150918304E-11 1.707731479476712E-9 4.310780440988899E-13
node 3.617142922710138E-14 -7.944991545771479E-14 -3.099323150918304E-11 3.112337234263406E-9 -3.111371161068153E-9 1.180740587945688E-10
peri -4.947391903486054E-13 1.032790955347747E-12 1.707731479476712E-9 -3.111371161068153E-9 3.679118003311876E-9 -1.175258561267623E-10
i -4.162045228777928E-16 1.086486450436375E-15 4.310780440988899E-13 1.180740587945688E-10 -1.175258561267623E-10 4.624246622372718E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 17.04   n/a MPCxxxxx  

181791 (1998 EX9)          Discovered 1998-Mar-08 by Beijing Schmidt CCD Asteroid Program at Xinglong
Reference: 20080420/Numbers.arcLast Updated: 2008-04-23

Alternate Designations
 1998 EX9 = 2002 PA35 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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