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85144 (1981 EU30)
Classification: Main-belt Asteroid          SPK-ID: 2085144
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1328046891375083 5.3847e-08  
a 2.34653733761846 9.5818e-09 au
q 2.034906175946484 1.2705e-07 au
i 6.519323471691162 5.6617e-06 deg
node 340.7597687192396 3.5742e-05 deg
peri 3.701519110311057 3.8936e-05 deg
M 166.0674277428461 1.5636e-05 deg
tp 2458394.850185636501
(2018-Oct-03.35018564)
5.6502e-05 TDB
period 1312.924130483211
3.59
8.0417e-06
2.202e-08
d
yr
n .2741971083032078 1.6795e-09 deg/d
Q 2.658168499290436 1.0854e-08 au
  Orbit Determination Parameters
   # obs. used (total)      907  
   data-arc span      14237 days (38.98 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54264  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 20:27:07  

Additional Information
 Earth MOID = 1.02725 au 
 Jupiter MOID = 2.72718 au 
 T_jup = 3.540 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457199.5 (2015-Jun-26.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .133472368176667 5.4142e-08  
q 2.033056210428695 1.2789e-07 au
tp 2457080.038758067651
(2015-Feb-26.53875807)
5.5454e-05 TDB
node 340.827627175659 3.5689e-05 deg
peri 3.203155234676007 3.8826e-05 deg
i 6.526069383314648 5.6657e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      907  
   data-arc span      14237 days (38.98 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-02-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54264  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 20:27:07  

Additional Information
 Jupiter MOID = 2.72718 au 
 T_jup = 3.540 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.931384826060653E-15 -6.909547732780086E-15 -5.957352059187705E-13 8.673796781355643E-16 -2.433239476884015E-13 1.300711173211433E-15
q -6.909547732780086E-15 1.635460250608906E-14 1.389489343670776E-12 -2.406298659449433E-15 5.715262718370736E-13 -2.800377751710803E-15
tp -5.957352059187705E-13 1.389489343670776E-12 3.075196594685028E-9 -4.963550692687846E-12 8.566952114479015E-10 -4.255206634749013E-12
node 8.673796781355643E-16 -2.406298659449433E-15 -4.963550692687846E-12 1.273695366028977E-9 -1.266126682196941E-9 -4.938452688898449E-11
peri -2.433239476884015E-13 5.715262718370736E-13 8.566952114479015E-10 -1.266126682196941E-9 1.507431995329144E-9 4.785648971483346E-11
i 1.300711173211433E-15 -2.800377751710803E-15 -4.255206634749013E-12 -4.938452688898449E-11 4.785648971483346E-11 3.210049938568771E-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 15.3   n/a MPO400787  

85144 (1981 EU30)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20040830/Numbers.arcLast Updated: 2004-09-06

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