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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1207771083462827 4.1048e-08  
a 2.342073210556522 1.0755e-08 au
q 2.059204380650211 9.494e-08 au
i 2.081964828878612 4.3042e-06 deg
node 306.3005897603851 0.00011951 deg
peri 241.0017515915191 0.00012076 deg
M 81.64002148106793 1.8433e-05 deg
tp 2459099.607151736253
(2020-Sep-07.10715174)
6.6311e-05 TDB
period 1309.179290205534
3.58
9.0177e-06
2.469e-08
d
yr
n .2749814350817312 1.8941e-09 deg/d
Q 2.624942040462833 1.2054e-08 au
  Orbit Determination Parameters
   # obs. used (total)      515  
   data-arc span      14756 days (40.40 yr)  
   first obs. used      1981-02-12  
   last obs. used      2021-07-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .55104  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 22:04:34  

Additional Information
 Earth MOID = 1.06204 au 
 Jupiter MOID = 2.33689 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 16.76   n/a E2021B10  
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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