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16037 Sheehan (1999 GX8)
Classification: Outer Main-belt Asteroid          SPK-ID: 2016037
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 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05088401283609489 4.7198e-08  
a 3.225275395306697 3.133e-08 au
q 3.06116044069197 1.6086e-07 au
i 15.31182297068785 6.6473e-06 deg
node 187.2051633158941 1.844e-05 deg
peri 100.9433456548947 7.3909e-05 deg
M 285.8606638222205 7.3213e-05 deg
tp 2458036.207288128783
0.00043241 JED
period 2115.673430771469
n .1701585862751644 2.4793e-09 deg/d
Q 3.389390349921424 3.2924e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1145  
   data-arc span      12384 days (33.91 yr)  
   first obs. used      1982-05-22  
   last obs. used      2016-04-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .5324  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Apr-25 13:23:57  

Additional Information
 Earth MOID = 2.09359 au 
 Jupiter MOID = 1.73911 au 
 T_jup = 3.130 
[ 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 12.9 mag n/a MPO279684  
diameter diameter 15.81 km 1.5 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2
geometric albedo albedo 0.0338   0.007 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 2

16037 Sheehan           Discovered 1999 Apr. 10 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Astronomy historian and psychiatrist William Patrick Sheehan (b. 1954) is a prolific author and the biographer of E. E. Barnard. He has traced the development of early studies of the moon and planets and of the Milky Way, and he has solved several long-standing puzzles in the history of astronomy.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040928/MPCPages.arcLast Updated: 2004-09-28

[ show close-approach data ]
Alternate Designations
 1999 GX8 = 1982 KS1 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-01 06:09 UT
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