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31109 Janpalous (1997 PL4)
Classification: Main-belt Asteroid          SPK-ID: 2031109
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 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .07291555589324723 4.4939e-08  
a 2.303950174170116 9.3777e-09 au
q 2.135956366470158 1.0388e-07 au
i 6.894125506118174 6.1425e-06 deg
node 344.4693797221142 3.2852e-05 deg
peri 241.5817818220278 5.3383e-05 deg
M 290.6203568849724 4.3387e-05 deg
tp 2459246.671409139457
(2021-Feb-01.17140914)
0.00015413 TDB
period 1277.344525155235
3.50
7.7987e-06
2.135e-08
d
yr
n .2818346913541194 1.7207e-09 deg/d
Q 2.471943981870075 1.0061e-08 au
  Orbit Determination Parameters
   # obs. used (total)      911  
   data-arc span      8720 days (23.87 yr)  
   first obs. used      1996-03-20  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .558  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 02:15:54  

Additional Information
 Earth MOID = 1.1375 au 
 Jupiter MOID = 2.52433 au 
 T_jup = 3.576 
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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 15.6   n/a MPO449190  
diameter diameter 3.596 km 0.171 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.146452 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.086   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

31109 Janpalouš           Discovered 1997 Aug. 14 by M. Tichy and Z. Moravec at Klet.
Jan Palouš (b. 1949) supervises dynamical studies of galaxies in the Astronomical Institute of the Czech Academy of Sciences. As a leading representative in both Czech and international astronomical bodies he was instrumental in negotiating the entry of the Czech Republic into the European Southern Observatory.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20080819/MPCPages.arcLast Updated: 2008-08-25

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