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9135 Lacaille (7609 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2009135
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .131599597273454 5.2792e-08  
a 2.310023521804182 1.4274e-08 au
q 2.006025356642545 1.259e-07 au
i 6.458903482896909 6.2786e-06 deg
node 45.77589385471417 4.4994e-05 deg
peri 229.211238683998 5.2283e-05 deg
M 40.71027411554098 3.0981e-05 deg
tp 2457455.481116920591
0.00010966 JED
period 1282.398584701684
n .2807239529851355 2.6019e-09 deg/d
Q 2.614021686965818 1.6152e-08 au
  Orbit Determination Parameters
   # obs. used (total)      916  
   data-arc span      19940 days (54.59 yr)  
   first obs. used      1960-10-17  
   last obs. used      2015-05-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .56229  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jun-04 16:04:17  

Additional Information
 Earth MOID = .996709 au 
 Jupiter MOID = 2.48163 au 
 T_jup = 3.565 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0 mag n/a MPO324393  

9135 Lacaille           Discovered 1960 Oct. 17 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Named in memory of Nicolas-Louis de Lacaille (1713-1762), French astronomer known as the "father of southern astronomy" for his naming of southern constellations and his countless astrometric observations of planets and stars. In 1750, the abbé Lacaille went to an expedition to the Cape for trigonometric determinations of the lunar and solar parallax, his observations being partly supported by simultaneous measurements by Lalande in Berlin. Lacaille's observations of the southern heavens resulted in a famous catalogue of 9766 stars, a work that was eventually published in 1847 by Baily. Lacaille is also known as a precise observer of comet 1P/Halley in 1759.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990402/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 7609 P-L = 1994 EK6 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-04 04:07 UT
(server date/time)  
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