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117329 Spencer (2004 XJ6)
Classification: Main-belt Asteroid          SPK-ID: 2117329
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.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
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 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1597850894545063 9.0064e-08  
a 2.433323263701569 2.4837e-08 au
q 2.044514488339282 2.1493e-07 au
i 6.926599817706077 8.5565e-06 deg
node 287.4384536508098 6.8514e-05 deg
peri 238.9010193304917 7.4439e-05 deg
M 337.9332700961195 3.2012e-05 deg
tp 2457685.483305175996
0.000124 JED
period 1386.430612810397
n .2596595867644999 3.9755e-09 deg/d
Q 2.822132039063855 2.8805e-08 au
  Orbit Determination Parameters
   # obs. used (total)      338  
   data-arc span      7483 days (20.49 yr)  
   first obs. used      1995-09-02  
   last obs. used      2016-02-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .50748  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 20:41:49  

Additional Information
 Earth MOID = 1.06136 au 
 Jupiter MOID = 2.20888 au 
 T_jup = 3.479 
[ 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 16.1 mag n/a MPO366546  

117329 Spencer           Discovered 2004 Dec. 9 at the Jarnac Observatory.
Henry Spencer (b. 1955) is a Canadian computer scientist and small-satellite engineer. He has been a pioneer of open-source software, including C News and the "regex" pattern-matching library. He is also the keeper of the oldest surviving Usenet archives and the software architect for the MOST astronomy satellite.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060809/MPCPages.arcLast Updated: 2007-08-08

Alternate Designations
 2004 XJ6 = 2003 TU47 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-01 21:16 UT
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