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5780 Lafontaine (1990 EJ2)
Classification: Outer Main-belt Asteroid          SPK-ID: 2005780
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1317986467834256 3.7508e-08  
a 3.346697666252636 2.0307e-08 au
q 2.90560744264729 1.26e-07 au
i 8.676479674544778 3.4044e-06 deg
node 233.2891304891065 2.8578e-05 deg
peri 115.1095035152577 3.1619e-05 deg
M 154.5241108333425 1.4367e-05 deg
tp 2458040.620093258842
(2017-Oct-14.12009326)
8.6444e-05 TDB
period 2236.264389830447
6.12
2.0353e-05
5.572e-08
d
yr
n .1609827539342498 1.4652e-09 deg/d
Q 3.787787889857981 2.2983e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2262  
   data-arc span      21026 days (57.57 yr)  
   first obs. used      1962-10-04  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44677  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:25:39  

Additional Information
 Earth MOID = 1.91388 au 
 Jupiter MOID = 1.78049 au 
 T_jup = 3.127 
[ show covariance matrix ]

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 12.2   n/a MPO384806  
diameter diameter 22.593 km 0.119 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.055   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

5780 Lafontaine (1990 EJ2)          Discovered 1990-Mar-02 by Elst, E. W. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1990 EJ2 = 1962 TO = 1975 VT1 = 1975 XB7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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