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90685 (1981 ET9)
Classification: Main-belt Asteroid          SPK-ID: 2090685
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 .1238461058038973 3.9522e-08  
a 2.350941314325761 9.6935e-09 au
q 2.059786387573019 9.5821e-08 au
i 4.188445008097311 4.0485e-06 deg
node 298.2839447936672 6.8147e-05 deg
peri 182.723127123174 7.1269e-05 deg
M .06283926417318222 2.1226e-05 deg
tp 2459000.270179005702
(2020-May-30.77017901)
7.7629e-05 TDB
period 1316.622004346685
3.60
8.1431e-06
2.229e-08
d
yr
n .2734269963675976 1.6911e-09 deg/d
Q 2.642096241078503 1.0894e-08 au
  Orbit Determination Parameters
   # obs. used (total)      698  
   data-arc span      14741 days (40.36 yr)  
   first obs. used      1979-09-20  
   last obs. used      2020-01-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53681  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 22:16:17  

Additional Information
 Earth MOID = 1.07569 au 
 Jupiter MOID = 2.42531 au 
 T_jup = 3.544 
[ 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 16.0   n/a MPO439639  
diameter diameter 1.684 km 0.346 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.298   0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

90685 (1981 ET9)          Discovered 1981-Mar-01 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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