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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .216988157819169 4.8953e-08  
a 2.590883245608702 1.1913e-08 au
q 2.02869226301952 1.2354e-07 au
i 5.495888039039096 4.0658e-06 deg
node 161.6913364175249 5.402e-05 deg
peri 95.65686508857885 5.4859e-05 deg
M 171.5517497099822 9.1632e-06 deg
tp 2458670.623323851973
(2019-Jul-06.12332385)
3.9765e-05 TDB
period 1523.246506404383
4.17
1.0506e-05
2.876e-08
d
yr
n .2363373219543949 1.63e-09 deg/d
Q 3.153074228197884 1.4497e-08 au
  Orbit Determination Parameters
   # obs. used (total)      621  
   data-arc span      9230 days (25.27 yr)  
   first obs. used      1995-10-26  
   last obs. used      2021-02-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60858  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 08:46:02  

Additional Information
 Earth MOID = 1.02288 au 
 Jupiter MOID = 1.93517 au 
 T_jup = 3.380 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457494.5 (2016-Apr-16.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2166576052903909 4.8949e-08  
q 2.03019492504323 1.2353e-07 au
tp 2457147.690617843779
(2015-May-05.19061784)
4.4069e-05 TDB
node 161.7364296672437 5.4026e-05 deg
peri 95.74868030886617 5.4875e-05 deg
i 5.49500075127357 4.0659e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      621  
   data-arc span      9230 days (25.27 yr)  
   first obs. used      1995-10-26  
   last obs. used      2021-02-01  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .60858  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 08:46:02  

Additional Information
 Jupiter MOID = 1.93517 au 
 T_jup = 3.380 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.39597809166395E-15 -6.031589008612034E-15 -9.705250371482157E-13 -1.28863747900429E-14 -2.049792477244936E-13 -5.94651842411394E-15
q -6.031589008612034E-15 1.525972151649839E-14 2.312325779647869E-12 3.535908855188888E-14 4.851330715319564E-13 1.52272287056954E-14
tp -9.705250371482157E-13 2.312325779647869E-12 1.942119116042348E-9 1.183106930091855E-11 4.625677936554336E-10 3.263942473931431E-12
node -1.28863747900429E-14 3.535908855188888E-14 1.183106930091855E-11 2.918758519869941E-9 -2.901846025135931E-9 5.061776104502333E-11
peri -2.049792477244936E-13 4.851330715319564E-13 4.625677936554336E-10 -2.901846025135931E-9 3.011213815016032E-9 -4.963852078514574E-11
i -5.94651842411394E-15 1.52272287056954E-14 3.263942473931431E-12 5.061776104502333E-11 -4.963852078514574E-11 1.653178652687548E-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 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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