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129099 Spoelhof (2004 XU3)
Classification: Main-belt Asteroid          SPK-ID: 2129099
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 .1793719733995462 8.1558e-08  
a 3.078728135551246 5.7031e-08 au
q 2.526490594316713 2.6545e-07 au
i 7.493558592343837 9.0877e-06 deg
node 154.4432605681319 5.9e-05 deg
peri 16.86157700814517 6.4221e-05 deg
M 334.2474589901537 3.2903e-05 deg
tp 2457741.647446079494
0.00018327 JED
period 1973.128809665423
n .1824513423738636 5.0696e-09 deg/d
Q 3.630965676785778 6.726e-08 au
  Orbit Determination Parameters
   # obs. used (total)      347  
   data-arc span      5378 days (14.72 yr)  
   first obs. used      2001-04-24  
   last obs. used      2016-01-14  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .49564  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-26 06:51:34  

Additional Information
 Earth MOID = 1.5329 au 
 Jupiter MOID = 1.34416 au 
 T_jup = 3.191 
[ 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 15.2 mag n/a MPO270642  

129099 Spoelhof           Discovered 2004 Dec. 3 by L. Molnar at the Calvin-Rehoboth Observatory.
William Spoelhof (b. 1909) served as president of Calvin College from 1951 to 1976. Among his achievements at this Christian liberal arts college, he fostered the establishment of an astronomy program. This included the construction of an observatory in 1970.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060613/MPCPages.arcLast Updated: 2008-05-22

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-Apr-30 22:33 UT
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