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7721 Andrillat (6612 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2007721
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

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 two-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.

Note: If the applet is not working, here are some notes that might help.
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1380013063508286 2.8598e-08  
a 2.606483481198582 9.0828e-09 au
q 2.246785355811322 7.3351e-08 au
i 4.001060155029835 3.7458e-06 deg
node 171.9164759952744 4.989e-05 deg
peri 148.2404709369948 5.1999e-05 deg
M 96.01978356555563 1.4862e-05 deg
tp 2458590.542237486518
(2019-Apr-17.04223749)
6.3116e-05 TDB
period 1537.024861174499
4.21
8.0341e-06
2.2e-08
d
yr
n .2342187228675731 1.2243e-09 deg/d
Q 2.966181606585841 1.0336e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1595  
   data-arc span      23626 days (64.68 yr)  
   first obs. used      1955-05-22  
   last obs. used      2020-01-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .55127  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:36:38  

Additional Information
 Earth MOID = 1.23524 au 
 Jupiter MOID = 2.33307 au 
 T_jup = 3.395 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.5   n/a MPO502226  

7721 Andrillat           Discovered 1960 Sept. 24 by C. J. van Houten and I. van Houten-Groeneveld on Palomar Schmidt plates taken by T. Gehrels.
Named in honor of Yvette Marie Josette (b. 1925), French spectroscopist who works mainly on infrared spectra of early-type stars. She has also contributed to the spectroscopy of galaxies, novae, planetary nebulae and comets. Near the end of her renowned career she became acting director of the Observatoire de Haute Provence. The planet is named also in honor of her husband, Henri Andrillat, who is a retired professor of astronomy and a prominent cosmologist. The couple now live in Toulouse. Name suggested and citation prepared by H. Haupt.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19980211/MPCPages.arcLast Updated: 2009-11-17

Alternate Designations
 6612 P-L = 1990 WF6 = 1990 WH7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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