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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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457312.5 (2015-Oct-17.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2165686097657114 4.9281e-08  
q 2.030325092335739 1.2448e-07 au
tp 2457147.668793001915
(2015-May-05.16879300)
4.5826e-05 TDB
node 161.7368529699514 5.432e-05 deg
peri 95.74848810345493 5.5252e-05 deg
i 5.494890111785928 4.3497e-06 deg
  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
 Jupiter MOID = 1.93714 au 
 T_jup = 3.380 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.428635024755341E-15 -6.118656511060654E-15 -9.186295315738202E-13 -9.153031361878828E-15 -1.935210570785451E-13 -5.292947184434117E-15
q -6.118656511060654E-15 1.54941635342166E-14 2.179688878127307E-12 2.609766226636455E-14 4.54275053123836E-13 1.358737241561235E-14
tp -9.186295315738202E-13 2.179688878127307E-12 2.10000731998647E-9 1.006731652980469E-11 5.005718837457919E-10 2.920162123772947E-12
node -9.153031361878828E-15 2.609766226636455E-14 1.006731652980469E-11 2.950632934984544E-9 -2.934041812887747E-9 4.823466119601462E-11
peri -1.935210570785451E-13 4.54275053123836E-13 5.005718837457919E-10 -2.934041812887747E-9 3.052815882038426E-9 -4.73496054944148E-11
i -5.292947184434117E-15 1.358737241561235E-14 2.920162123772947E-12 4.823466119601462E-11 -4.73496054944148E-11 1.891969359836023E-11

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. 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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