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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 ]

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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02351491166849294 4.512e-08  
a 3.058777723659019 2.0591e-08 au
q 2.986850835673624 1.3664e-07 au
i 9.820592568448197 4.5707e-06 deg
node 100.9329148966623 2.5686e-05 deg
peri 322.2281348652903 0.00010183 deg
M 219.1673445608443 0.00010143 deg
tp 2459964.900869180847
(2023-Jan-20.40086918)
0.00055504 TDB
period 1953.980857969361
5.35
1.9731e-05
5.402e-08
d
yr
n .1842392664860205 1.8604e-09 deg/d
Q 3.130704611644415 2.1075e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1063  
   data-arc span      10845 days (29.69 yr)  
   first obs. used      1990-11-11  
   last obs. used      2020-07-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53318  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 06:48:24  

Additional Information
 Earth MOID = 2.00701 au 
 Jupiter MOID = 2.003 au 
 T_jup = 3.212 
[ 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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