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90681 (1981 EG4)
Classification: Main-belt Asteroid          SPK-ID: 2090681
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1283995644849092 4.3688e-08  
a 2.345981887690666 9.0562e-09 au
q 2.044758835021699 1.0184e-07 au
i 5.871247674434979 3.9249e-06 deg
node 278.3668286159666 3.9755e-05 deg
peri 42.88072418598077 4.1827e-05 deg
M 194.2025000221523 1.4199e-05 deg
tp 2459604.950701483026
(2022-Jan-25.45070148)
5.2819e-05 TDB
period 1312.457983763104
3.59
7.5998e-06
2.081e-08
d
yr
n .2742944951028461 1.5883e-09 deg/d
Q 2.647204940359632 1.0219e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1175  
   data-arc span      14323 days (39.21 yr)  
   first obs. used      1981-02-02  
   last obs. used      2020-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50499  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 16:33:57  

Additional Information
 Earth MOID = 1.03615 au 
 Jupiter MOID = 2.6238 au 
 T_jup = 3.543 
[ 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 15.3   n/a MPO453345  
diameter diameter 2.005 km 0.435 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.482   0.172 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

90681 (1981 EG4)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1981 EG4 = 2000 OY43 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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