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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 ]

[ 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 .1286380081389405 3.5822e-08  
a 2.345445681332568 8.3826e-09 au
q 2.043732220687867 8.5226e-08 au
i 5.871213799641946 3.7051e-06 deg
node 278.3619000531264 3.6079e-05 deg
peri 42.97396855410206 3.831e-05 deg
M 302.7656141268551 1.3746e-05 deg
tp 2459605.088817709851
(2022-Jan-25.58881771)
5.0365e-05 TDB
period 1312.008039048086
3.59
7.0336e-06
1.926e-08
d
yr
n .2743885626350234 1.471e-09 deg/d
Q 2.64715914197727 9.4609e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1309  
   data-arc span      14792 days (40.50 yr)  
   first obs. used      1981-02-02  
   last obs. used      2021-08-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49693  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 18:16:34  

Additional Information
 Earth MOID = 1.03451 au 
 Jupiter MOID = 2.62288 au 
 T_jup = 3.543 
[ 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 15.31   n/a MPO637233  
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

Alternate Designations
 1981 EG4 = 2000 OY43 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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