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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 
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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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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1929-Jun-12 03:02 00:02 Jupiter 1.9179451289861 1.91794471097601 1.9179455469962 1.64992287464074 1.35609183729225 2425774.626289221 1.64983702692787 108.095603005424 74.907601361085 48.5707002620844 1537283.0201619 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 08:46:04 2021-Apr-13 08:46
2000-Apr-09 01:29 < 00:01 Jupiter 1.95558635247516 1.9555859134903 1.95558679145981 1.96696175393731 1.73282404211344 2451643.562074063 0.338647735400117 43.681286436182 35.5324839633879 66.2469265138867 1706336.07122707 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 08:46:04 2021-Apr-13 08:46
2013-Apr-23 07:29 < 00:01 Jupiter 1.98803239432771 1.9880319899703 1.98803279868478 1.54316069330651 1.23661776129895 2456405.811630370 0.165779706858 86.3629799788164 56.5733663015903 -6.25060335568714 1804597.99774616 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 08:46:04 2021-Apr-13 08:46
2084-Feb-18 21:31 00:01 Jupiter 1.93845543087148 1.93845504914994 1.93845581259259 1.46639976125697 1.12978466606577 2482274.396752778 1.32538363081587 144.43751656704 69.9719462803952 10.1614536271783 1533068.55263953 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 08:46:04 2021-Apr-13 08:46
2154-Dec-18 09:59 00:03 Jupiter 1.92994580756592 1.9299452588775 1.92994635625346 1.58765810503464 1.28175273621557 2508143.916317274 2.67136711719183 207.607097314293 60.4619353924511 31.2856243240525 1315591.49723612 T 17 CATAB v2.0f-lin.ifort 2021-Apr-13 08:46:04 2021-Apr-13 08:46
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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