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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2173164118991704 4.9295e-08  
a 2.590367795126338 1.211e-08 au
q 2.027438360390317 1.2457e-07 au
i 5.496154866614098 4.3501e-06 deg
node 161.6970218655198 5.4318e-05 deg
peri 95.63492573699689 5.5235e-05 deg
M 77.94010977230761 9.7471e-06 deg
tp 2458670.815076490815
(2019-Jul-06.31507649)
4.1703e-05 TDB
period 1522.791959236838
4.17
1.0678e-05
2.923e-08
d
yr
n .2364078676777473 1.6578e-09 deg/d
Q 3.153297229862359 1.4741e-08 au
  Orbit Determination Parameters
   # obs. used (total)      595  
   data-arc span      9150 days (25.05 yr)  
   first obs. used      1995-10-26  
   last obs. used      2020-11-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .60609  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 03:41:22  

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 16.09   n/a E2021B10  
rotation period rot_per 9.55 h n/a LCDB (Rev. 2020-October); 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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