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5642 Bobbywilliams (1990 OK1)
Classification: Mars-crossing Asteroid          SPK-ID: 2005642
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 6 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3334221974543084 8.5239e-08  
a 2.314904327502086 1.3506e-08 au
q 1.543063839729852 1.9675e-07 au
i 24.98051737014946 1.3574e-05 deg
node 310.180960126741 1.6874e-05 deg
peri 38.95852904411623 2.5255e-05 deg
M 123.2910068372385 1.9305e-05 deg
tp 2457159.917852445979
6.6619e-05 JED
period 1286.465064956721
n .2798365923851271 2.449e-09 deg/d
Q 3.086744815274319 1.8009e-08 au
  Orbit Determination Parameters
   # obs. used (total)      580  
   data-arc span      14928 days (40.87 yr)  
   first obs. used      1975-04-09  
   last obs. used      2016-02-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .61527  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Mar-24 15:49:37  

Additional Information
 Earth MOID = .580628 au 
 Jupiter MOID = 2.44563 au 
 T_jup = 3.388 
[ 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 14.0 mag n/a MPO256905  
rotation period rot_per 4.8341 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Oey, J. (2012) Minor Planet Bul. 39, 145-147.]

5642 Bobbywilliams           Discovered 1990 July 27 by H. E. Holt at Palomar.
Named in honor of Bobby G. Williams (b. 1951), celestial mechanics and spacecraft navigation expert at the Jet Propulsion Laboratory. Williams has been a leader of the navigation effort for the NEAR mission to (253) Mathilde and (433) Eros. Name suggested and citation provided by J. Veverka and D. K. Yeomans.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2016-May-05 16:11 UT
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