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39890 Bobstephens (1998 FA3)
Classification: Main-belt Asteroid          SPK-ID: 2039890
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2174870609241837 5.7408e-08  
a 2.591342911255322 1.3296e-08 au
q 2.027759357639685 1.4845e-07 au
i 5.494832486093269 4.7597e-06 deg
node 161.7205642121871 6.1464e-05 deg
peri 95.75014094140118 6.2854e-05 deg
M 343.2960475308898 1.0862e-05 deg
tp 2458671.197246906675
(2019-Jul-06.69724691)
4.5771e-05 TDB
period 1523.651898164122
4.17
1.1727e-05
3.211e-08
d
yr
n .2362744406604757 1.8185e-09 deg/d
Q 3.15492646487096 1.6188e-08 au
  Orbit Determination Parameters
   # obs. used (total)      545  
   data-arc span      8703 days (23.83 yr)  
   first obs. used      1995-10-26  
   last obs. used      2019-08-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60635  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 05:49:20  

Additional Information
 Earth MOID = 1.02154 au 
 Jupiter MOID = 1.9357 au 
 T_jup = 3.379 
[ 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 15.9   n/a MPO493127  
rotation period rot_per 9.55 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Coley, D. (2012) Minor Planet Bull. 39, 23-24.]

39890 Bobstephens           Discovered 1998 Mar. 23 by P. Pravec at Ondřejov.
Robert Stephens (b. 1955) is a Californian amateur astronomer who has determined some 30 sets of minor-planet lightcurve parameters since becoming active in the field in 1999. His high-quality work and generosity in sharing his time and knowledge within the amateur community have set a standard for others to follow.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020724/MPCPages.arcLast Updated: 2003-10-02

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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