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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 4 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .146417578263484 5.1927e-08  
a 3.115865996207567 3.0888e-08 AU
q 2.659648442849317 1.5954e-07 AU
i .5898462123467364 8.3337e-06 deg
node 342.2464809232715 0.00053601 deg
peri 118.6227393650463 0.00053656 deg
M 122.9020540379712 3.0311e-05 deg
tp 2456114.659345873448
(2012-Jul-06.15934587)
0.00016748 JED
period 2008.938234744857
5.50
2.9873e-05
8.179e-08
d
yr
n .1791991380191544 2.6647e-09 deg/d
Q 3.572083549565817 3.5411e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      915  
   data-arc span      8446 days (23.12 yr)  
   first obs. used      1991-02-22  
   last obs. used      2014-04-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56381  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Apr-17 14:00:35  

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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