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

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02231440923052301 4.3098e-08  
a 3.062066443034086 2.0667e-08 au
q 2.993738239333172 1.3175e-07 au
i 9.810473310799743 4.4847e-06 deg
node 100.9104173739933 2.5108e-05 deg
peri 320.8459855810003 0.00010595 deg
M 256.5729211012564 0.00010582 deg
tp 2459958.779306235341
(2023-Jan-14.27930624)
0.0005786 TDB
period 1957.133010039806
5.36
1.9814e-05
5.425e-08
d
yr
n .1839425313217102 1.8622e-09 deg/d
Q 3.130394646735001 2.1128e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1085  
   data-arc span      11196 days (30.65 yr)  
   first obs. used      1990-11-11  
   last obs. used      2021-07-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53063  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-09 14:11:38  

Additional Information
 Earth MOID = 2.01437 au 
 Jupiter MOID = 2.0009 au 
 T_jup = 3.211 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.14   n/a E2021B10  
diameter diameter 5.954 km 0.366 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.137   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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