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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1237090769481968 3.2191e-08  
a 2.350335735451809 8.7245e-09 au
q 2.059577871100704 7.6614e-08 au
i 4.188398973514564 3.6631e-06 deg
node 298.2818032858787 6.6577e-05 deg
peri 182.6108324202292 6.9613e-05 deg
M 108.47540409014 2.1195e-05 deg
tp 2458999.927990038545
(2020-May-30.42799004)
7.6752e-05 TDB
period 1316.113314198758
3.60
7.3281e-06
2.006e-08
d
yr
n .2735326784678612 1.523e-09 deg/d
Q 2.641093599802913 9.8038e-09 au
  Orbit Determination Parameters
   # obs. used (total)      764  
   data-arc span      15242 days (41.73 yr)  
   first obs. used      1979-09-20  
   last obs. used      2021-06-13  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53323  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 08:55:41  

Additional Information
 Earth MOID = 1.07597 au 
 Jupiter MOID = 2.42574 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 16.11   n/a MPCxxxxx  
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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