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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 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1458287909030975 4.4368e-08  
a 3.117402821990802 2.7661e-08 au
q 2.66279573770198 1.3294e-07 au
i .5894651219417573 5.8522e-06 deg
node 342.2498272323919 0.00045044 deg
peri 118.7178318265903 0.00045092 deg
M 266.056323119132 2.3833e-05 deg
tp 2458125.129692253056
(2018-Jan-06.62969225)
0.00013721 JED
period 2010.424708526217
5.50
2.6758e-05
7.326e-08
d
yr
n .1790666412292084 2.3833e-09 deg/d
Q 3.572009906279625 3.1695e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1038  
   data-arc span      9018 days (24.69 yr)  
   first obs. used      1991-02-22  
   last obs. used      2015-11-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5421  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Nov-30 16:09:04  

Additional Information
 Earth MOID = 1.67815 au 
 Jupiter MOID = 1.58661 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 13.4 mag n/a MPO344394  

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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