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48399 (1981 EA21)
Classification: Main-belt Asteroid          SPK-ID: 2048399
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04089330178342458 3.8927e-08  
a 2.80681162341388 1.4744e-08 au
q 2.692031828648393 1.0822e-07 au
i .8186618633060814 3.9566e-06 deg
node 314.8457833876244 0.0003064 deg
peri 218.159259297921 0.0003104 deg
M 41.57060813132344 4.8981e-05 deg
tp 2458402.163701702765
(2018-Oct-10.66370170)
0.00023379 TDB
period 1717.585346874056
4.70
1.3534e-05
3.705e-08
d
yr
n .2095965715212855 1.6515e-09 deg/d
Q 2.921591418179368 1.5347e-08 au
  Orbit Determination Parameters
   # obs. used (total)      981  
   data-arc span      13970 days (38.25 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5239  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 04:38:02  

Additional Information
 Earth MOID = 1.69699 au 
 Jupiter MOID = 2.04326 au 
 T_jup = 3.321 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456555.5 (2013-Sep-20.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04083211109265027 3.8808e-08  
q 2.69163913228835 1.0778e-07 au
tp 2456674.730938581542
(2014-Jan-17.23093858)
0.00023626 TDB
node 314.913690934515 0.00030628 deg
peri 215.964514517398 0.00031033 deg
i .8189867014409601 3.9572e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      981  
   data-arc span      13970 days (38.25 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5239  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 04:38:02  

Additional Information
 Jupiter MOID = 2.04326 au 
 T_jup = 3.321 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.506086791122592E-15 -4.146873358761073E-15 1.016184150738582E-12 1.328017780624444E-15 2.079872848205382E-13 -9.110559251025913E-17
q -4.146873358761073E-15 1.161714970897774E-14 -3.152786503228394E-12 -7.909761850092475E-16 -6.526874499697194E-13 2.550541251923493E-16
tp 1.016184150738582E-12 -3.152786503228394E-12 5.581857797034398E-8 -6.664937575878156E-12 1.183755293617546E-8 -6.249170327188137E-13
node 1.328017780624444E-15 -7.909761850092475E-16 -6.664937575878156E-12 9.380615666078212E-8 -9.379732368361943E-8 1.475825110625382E-10
peri 2.079872848205382E-13 -6.526874499697194E-13 1.183755293617546E-8 -9.379732368361943E-8 9.630485310087253E-8 -1.477033265102952E-10
i -9.110559251025913E-17 2.550541251923493E-16 -6.249170327188137E-13 1.475825110625382E-10 -1.477033265102952E-10 1.565935287748053E-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 14.9   n/a MPO257193  

48399 (1981 EA21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1981 EA21 = 2000 GQ29 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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