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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09441052986386735 3.7616e-08  
a 3.203009014103361 2.3545e-08 au
q 2.90061123592312 1.2455e-07 au
i 1.597512420769789 4.6456e-06 deg
node 35.56692812513744 0.00015444 deg
peri 248.5491620140827 0.00015653 deg
M 215.9284558031992 2.7065e-05 deg
tp 2459438.437021086326
(2021-Aug-11.93702109)
0.00016021 TDB
period 2093.802279088614
5.73
2.3087e-05
6.321e-08
d
yr
n .1719360054172355 1.8958e-09 deg/d
Q 3.505406792283603 2.5768e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1441  
   data-arc span      10290 days (28.17 yr)  
   first obs. used      1991-03-20  
   last obs. used      2019-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50384  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-12 22:41:25  

Additional Information
 Earth MOID = 1.88408 au 
 Jupiter MOID = 1.62059 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 13.4   n/a MPO344449  
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

[ show close-approach data ]
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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