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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04220216548717292 3.8136e-08  
a 2.808698455512781 1.4751e-08 au
q 2.690165298489664 1.0608e-07 au
i .8195950264916148 3.7341e-06 deg
node 314.7511645770579 0.00030361 deg
peri 219.2014677301078 0.00030728 deg
M 124.2756280771224 4.6355e-05 deg
tp 2458406.974249336397
(2018-Oct-15.47424934)
0.00022195 TDB
period 1719.317564875225
4.71
1.3545e-05
3.708e-08
d
yr
n .2093854022983393 1.6495e-09 deg/d
Q 2.927231612535899 1.5374e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1002  
   data-arc span      14020 days (38.38 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-06-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54033  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 09:05:57  

Additional Information
 Earth MOID = 1.69445 au 
 Jupiter MOID = 2.03596 au 
 T_jup = 3.321 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456658.5 (2014-Jan-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04073647480507687 3.7849e-08  
q 2.691597898780152 1.0455e-07 au
tp 2456675.202719218956
(2014-Jan-17.70271922)
0.00023434 TDB
node 314.9136414242237 0.00030425 deg
peri 216.0712359339865 0.00030828 deg
i .8189771929534896 3.7308e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1002  
   data-arc span      14020 days (38.38 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-06-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54033  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 09:05:57  

Additional Information
 Jupiter MOID = 2.03596 au 
 T_jup = 3.321 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.432548724953089E-15 -3.924289602735146E-15 1.192056436503562E-12 9.387557345912877E-16 2.406152120997249E-13 -1.28359037462773E-16
q -3.924289602735146E-15 1.093118314290854E-14 -3.763079170237049E-12 8.196131071398329E-16 -7.678579630656131E-13 3.643452848569127E-16
tp 1.192056436503562E-12 -3.763079170237049E-12 5.491690260806343E-8 -8.847068022996659E-12 1.166912791780892E-8 -8.172339769549403E-13
node 9.387557345912877E-16 8.196131071398329E-16 -8.847068022996659E-12 9.25670984127801E-8 -9.255887664842396E-8 1.241901383729618E-10
peri 2.406152120997249E-13 -7.678579630656131E-13 1.166912791780892E-8 -9.255887664842396E-8 9.503469831803533E-8 -1.243546440887959E-10
i -1.28359037462773E-16 3.643452848569127E-16 -8.172339769549403E-13 1.241901383729618E-10 -1.243546440887959E-10 1.391908351009528E-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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