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31324 Jirimrazek (1998 HR31)
Classification: Main-belt Asteroid          SPK-ID: 2031324
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2457000.5 (2014-Dec-09.0) TDB
Reference: JPL 8 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02588372845101925 6.6471e-08  
a 3.055413183796613 4.4348e-08 AU
q 2.976327698641557 1.9861e-07 AU
i 9.822644654847767 7.425e-06 deg
node 100.9464737597346 4.1142e-05 deg
peri 324.8436237882425 0.00016568 deg
M 170.7046044969565 0.00015751 deg
tp 2456075.490731910542
(2012-May-27.99073191)
0.00085414 JED
period 1950.757787076224
5.34
4.2472e-05
1.163e-07
d
yr
n .1845436693294273 4.0179e-09 deg/d
Q 3.134498668951668 4.5496e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      581  
   data-arc span      8598 days (23.54 yr)  
   first obs. used      1990-11-11  
   last obs. used      2014-05-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54842  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Jan-08 03:23:54  

Additional Information
 Earth MOID = 1.99621 AU 
 T_jup = 3.213 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.0 mag n/a MPO263609  

31324 Jiřímrázek           Discovered 1998 Apr. 27 by L. Šarounová at Ondřejov.
Jiří Mrázek (1923-1978) was a Czech geophysicist specializing in ionospheric studies but with much wider interests in science, philosophy and classical music. A master of the popularization of astronautics, astronomy, computer science and related subjects, he was a TV and radio star until his untimely death.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20020624/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1998 HR31 = 1990 VN10 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
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