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90689 (1981 EA31)
Classification: Main-belt Asteroid          SPK-ID: 2090689
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1209255642065451 4.1081e-08  
a 2.341969430099026 1.0941e-08 au
q 2.05876545540982 9.5124e-08 au
i 2.082098432827759 4.3062e-06 deg
node 306.2988309996952 0.00011977 deg
peri 240.882443836021 0.00012101 deg
M 332.8362829546219 1.8167e-05 deg
tp 2459099.277255872906
(2020-Sep-06.77725587)
6.6298e-05 TDB
period 1309.092273890282
3.58
9.1734e-06
2.512e-08
d
yr
n .2749997132976528 1.927e-09 deg/d
Q 2.625173404788231 1.2264e-08 au
  Orbit Determination Parameters
   # obs. used (total)      511  
   data-arc span      14234 days (38.97 yr)  
   first obs. used      1981-02-12  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55105  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:16:17  

Additional Information
 Earth MOID = 1.06085 au 
 Jupiter MOID = 2.33865 au 
 T_jup = 3.553 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 16.6   n/a MPO453345  
diameter diameter 2.707 km 0.217 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)  

90689 (1981 EA31)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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