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18562 Ellenkey (1997 EK54)
Classification: Outer Main-belt Asteroid          SPK-ID: 2018562
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09474842451536258 3.4458e-08  
a 3.201410591256943 2.0868e-08 au
q 2.898081981508553 1.1811e-07 au
i 1.597804608883195 4.1701e-06 deg
node 35.55569524879113 0.00013638 deg
peri 248.8695764876829 0.00013852 deg
M 318.848594280798 2.6192e-05 deg
tp 2459439.662270270778
(2021-Aug-13.16227027)
0.000153 TDB
period 2092.235144650358
5.73
2.0457e-05
5.601e-08
d
yr
n .1720647896200793 1.6823e-09 deg/d
Q 3.504739201005334 2.2845e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1678  
   data-arc span      10689 days (29.26 yr)  
   first obs. used      1991-03-20  
   last obs. used      2020-06-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .48178  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:31:55  

Additional Information
 Earth MOID = 1.88025 au 
 Jupiter MOID = 1.62224 au 
 T_jup = 3.186 
[ 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 13.45   n/a E2021B10  
diameter diameter 11.685 km 0.347 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.043   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18562 Ellenkey           Discovered 1997 Mar. 8 by E. W. Elst at the European Southern Observatory.
Ellen Karolina Sofia Key (1849-1926) was a Swedish feminist and writer on subjects such as family life, ethics and education. She was on early advocate of child-centered approach to education.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2018-05-29Last Updated: 2018-05-31

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Alternate Designations
 1997 EK54 = 1991 FP2 = 1999 RL24 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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