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

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .131966442052637 3.1667e-08  
a 2.309464183741263 7.6682e-09 au
q 2.004692412364931 7.4597e-08 au
i 6.457347458217486 4.0102e-06 deg
node 45.75660324488687 2.9661e-05 deg
peri 228.9673884263118 3.4045e-05 deg
M 73.99777507026739 1.501e-05 deg
tp 2458736.999505265215
5.3635e-05 TDB
period 1281.932842094838
n .2808259435897712 1.3987e-09 deg/d
Q 2.614235955117595 8.6802e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1374  
   data-arc span      21471 days (58.78 yr)  
   first obs. used      1960-10-17  
   last obs. used      2019-07-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55015  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 19:12:29  

Additional Information
 Earth MOID = .995518 au 
 Jupiter MOID = 2.48537 au 
 T_jup = 3.565 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.0   n/a MPO431605  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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