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5642 Bobbywilliams (1990 OK1)
Classification: Mars-crossing Asteroid          SPK-ID: 2005642
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 14 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3328882841168277 7.4293e-08  
a 2.315557373320977 1.0136e-08 au
q 1.544735452542088 1.7185e-07 au
i 24.96088168586208 1.1211e-05 deg
node 310.0717993226486 9.7187e-06 deg
peri 39.12963149434317 1.6371e-05 deg
M 154.7375854716739 1.5305e-05 deg
tp 2458447.309056981871
(2018-Nov-24.80905698)
5.2482e-05 TDB
period 1287.009480466416
3.52
8.4503e-06
2.314e-08
d
yr
n .2797182192236338 1.8366e-09 deg/d
Q 3.086379294099866 1.351e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1020  
   data-arc span      16450 days (45.04 yr)  
   first obs. used      1975-04-09  
   last obs. used      2020-04-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51426  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 02:23:48  

Additional Information
 Earth MOID = .583269 au 
 Jupiter MOID = 2.45768 au 
 T_jup = 3.388 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.1   n/a MPO405908  
diameter diameter 3.167 km 0.407 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 4.8341 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Oey, J. (2012) Minor Planet Bull. 39, 145-147.]
geometric albedo albedo 0.433   0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

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

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