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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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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 13 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .217316382800168 5.7381e-08  
a 2.590367801639466 1.3288e-08 au
q 2.027438440865155 1.4823e-07 au
i 5.496155795729134 4.7458e-06 deg
node 161.6970013796353 6.1297e-05 deg
peri 95.63493591796275 6.2693e-05 deg
M 77.94011494449211 1.0607e-05 deg
tp 2458670.815053369168
(2019-Jul-06.31505337)
4.5722e-05 TDB
period 1522.791964980118
4.17
1.1717e-05
3.208e-08
d
yr
n .2364078667861241 1.8191e-09 deg/d
Q 3.153297162413779 1.6176e-08 au
  Orbit Determination Parameters
   # obs. used (total)      549  
   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      .60892  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 05:38:01  

Additional Information
 Earth MOID = 1.02155 au 
 Jupiter MOID = 1.93714 au 
 T_jup = 3.380 
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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-August); 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

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