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24631 (1981 EB21)
Classification: Main-belt Asteroid          SPK-ID: 2024631
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1619476296729129 3.3993e-08  
a 3.104879065343357 1.76e-08 au
q 2.602051260289951 1.022e-07 au
i 2.220511306404682 3.8102e-06 deg
node 298.0240419157758 0.00011375 deg
peri 162.5160987469528 0.00011463 deg
M 200.5741813035041 1.5887e-05 deg
tp 2460281.455872769749
(2023-Dec-02.95587277)
9.25e-05 TDB
period 1998.32195814913
5.47
1.6992e-05
4.652e-08
d
yr
n .1801511505850821 1.5318e-09 deg/d
Q 3.607706870396763 2.0451e-08 au
  Orbit Determination Parameters
   # obs. used (total)      928  
   data-arc span      15231 days (41.70 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-08-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5225  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:19:34  

Additional Information
 Earth MOID = 1.61925 au 
 Jupiter MOID = 1.55255 au 
 T_jup = 3.199 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457205.5 (2015-Jul-02.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .165428609713178 3.4134e-08  
q 2.586270873371698 1.03e-07 au
tp 2456292.508737647685
(2012-Dec-31.00873765)
7.6325e-05 TDB
node 298.044867665338 0.00011373 deg
peri 162.4440374889024 0.00011456 deg
i 2.223255860979559 3.8116e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      928  
   data-arc span      15231 days (41.70 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-08-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5225  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 15:19:34  

Additional Information
 Jupiter MOID = 1.55255 au 
 T_jup = 3.199 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.165110349152592E-15 -3.481411359280144E-15 3.126526395764247E-14 2.168896995840702E-15 3.787031209898256E-14 -1.610611960465366E-16
q -3.481411359280144E-15 1.060880642172015E-14 1.37239038862354E-13 -3.513458489461096E-15 -5.658918836251713E-14 4.76425770470253E-16
tp 3.126526395764247E-14 1.37239038862354E-13 5.825452198380823E-9 -6.524098164593354E-13 1.082204105360127E-9 1.091622102391217E-12
node 2.168896995840702E-15 -3.513458489461096E-15 -6.524098164593354E-13 1.293386937932301E-8 -1.292337943194288E-8 3.023565054317122E-11
peri 3.787031209898256E-14 -5.658918836251713E-14 1.082204105360127E-9 -1.292337943194288E-8 1.312472686839462E-8 -3.003488952751198E-11
i -1.610611960465366E-16 4.76425770470253E-16 1.091622102391217E-12 3.023565054317122E-11 -3.003488952751198E-11 1.452863230678174E-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 14.69   n/a MPO636428  

24631 (1981 EB21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20010606/Numbers.arcLast Updated: 2004-04-19

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