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11517 Esteracuna (1991 EA4)
Classification: Main-belt Asteroid          SPK-ID: 2011517
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2456800.5 (2014-May-23.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1464175896291058 4.464e-08  
a 3.115865973790155 2.8643e-08 AU
q 2.659648388300454 1.3324e-07 AU
i .589829821695032 6.6989e-06 deg
node 342.2462766944616 0.00048612 deg
peri 118.6229981954432 0.00048657 deg
M 122.9020083352536 2.4647e-05 deg
tp 2456114.659608313683
(2012-Jul-06.15960831)
0.00013451 JED
period 2008.938213064594
5.50
2.7701e-05
7.584e-08
d
yr
n .1791991399530538 2.4709e-09 deg/d
Q 3.572083559279856 3.2837e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      960  
   data-arc span      8523 days (23.33 yr)  
   first obs. used      1991-02-22  
   last obs. used      2014-06-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .55898  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jul-14 12:26:25  

Additional Information
 Earth MOID = 1.67613 AU 
 T_jup = 3.201 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.3 mag n/a MPO263453  

11517 Esteracuna           Discovered 1991 Mar. 12 by H. Debehogne at the European Southern Observatory.
Maria Ester Acuna Castillo (b. 1951) was a caretaker at the Manuel Foster Observatory for several decades. She assisted astronomers during observations with the historical single-prism spectrograph mounted on a replica of the Lick Observatory telescope on Cerro San Cristobal in the heart of Santiago de Chile.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20110715/MPCPages.arcLast Updated: 2011-07-20

[ show close-approach data ]
Alternate Designations
 1991 EA4 = 1997 GS3 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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