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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1619476299180757 3.405e-08  
a 3.104879065504765 1.7642e-08 au
q 2.602051259664019 1.0233e-07 au
i 2.220511318526922 3.8109e-06 deg
node 298.0240480172232 0.00011679 deg
peri 162.5160923089136 0.00011768 deg
M 200.5741815501375 1.6012e-05 deg
tp 2460281.455871469720
(2023-Dec-02.95587147)
9.31e-05 TDB
period 1998.321958304954
5.47
1.7032e-05
4.663e-08
d
yr
n .1801511505710344 1.5354e-09 deg/d
Q 3.607706871345511 2.0499e-08 au
  Orbit Determination Parameters
   # obs. used (total)      921  
   data-arc span      15200 days (41.62 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-07-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5242  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 10:17:48  

Additional Information
 Earth MOID = 1.61925 au 
 Jupiter MOID = 1.55255 au 
 T_jup = 3.199 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457156.5 (2015-May-14.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1654874382377992 3.4183e-08  
q 2.585952690040401 1.0308e-07 au
tp 2456292.550140883805
(2012-Dec-31.05014088)
7.7386e-05 TDB
node 298.0438388967553 0.00011677 deg
peri 162.4396943478034 0.00011761 deg
i 2.223319899930061 3.8123e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      921  
   data-arc span      15200 days (41.62 yr)  
   first obs. used      1979-11-22  
   last obs. used      2021-07-04  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5242  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 10:17:48  

Additional Information
 Jupiter MOID = 1.55255 au 
 T_jup = 3.199 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.168479961360668E-15 -3.489121502770163E-15 7.180165853646069E-15 2.169472368314252E-15 3.292994015303271E-14 -1.655009640479241E-16
q -3.489121502770163E-15 1.062602461900493E-14 1.941296714139904E-13 -3.449715671474695E-15 -4.498476490934281E-14 4.874481257920938E-16
tp 7.180165853646069E-15 1.941296714139904E-13 5.988621543601112E-9 -7.827040050172936E-13 1.116131935496728E-9 1.121822917462736E-12
node 2.169472368314252E-15 -3.449715671474695E-15 -7.827040050172936E-13 1.363446071648957E-8 -1.362343151251054E-8 3.205371168382408E-11
peri 3.292994015303271E-14 -4.498476490934281E-14 1.116131935496728E-9 -1.362343151251054E-8 1.38312370135386E-8 -3.184518891489151E-11
i -1.655009640479241E-16 4.874481257920938E-16 1.121822917462736E-12 3.205371168382408E-11 -3.184518891489151E-11 1.453394385317778E-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 14.68   n/a E2021B10  

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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