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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 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02231441658794045 4.0913e-08  
a 3.062066446180998 2.0001e-08 au
q 2.993738219880961 1.2662e-07 au
i 9.810471435418274 4.3694e-06 deg
node 100.9104284517408 2.4374e-05 deg
peri 320.8459832898901 0.00010489 deg
M 256.5729115460045 0.00010466 deg
tp 2459958.779359049071
(2023-Jan-14.27935905)
0.00057213 TDB
period 1957.13301305685
5.36
1.9175e-05
5.25e-08
d
yr
n .1839425310381512 1.8022e-09 deg/d
Q 3.130394672481035 2.0447e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1118  
   data-arc span      11229 days (30.74 yr)  
   first obs. used      1990-11-11  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52996  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 23:48:48  

Additional Information
 Earth MOID = 2.01437 au 
 Jupiter MOID = 2.0009 au 
 T_jup = 3.211 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457444.5 (2016-Feb-26.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02549722972574503 4.0922e-08  
q 2.978659923911581 1.2621e-07 au
tp 2458025.416164438355
(2017-Sep-28.91616444)
0.00049259 TDB
node 100.9460679641608 2.4342e-05 deg
peri 324.5922171484344 9.2757e-05 deg
i 9.821136760902164 4.3765e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1118  
   data-arc span      11229 days (30.74 yr)  
   first obs. used      1990-11-11  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52996  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 23:48:48  

Additional Information
 Jupiter MOID = 2.0009 au 
 T_jup = 3.211 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.674638553267251E-15 -5.105737346697923E-15 -1.812995393904448E-14 8.671669558268447E-15 -1.988975885281152E-14 5.223748445107941E-16
q -5.105737346697923E-15 1.592889785586626E-14 4.889837364031395E-12 -2.430229844419596E-14 9.225084214898033E-13 -1.384373527712798E-15
tp -1.812995393904448E-14 4.889837364031395E-12 2.426491843340031E-7 4.53052166356719E-12 4.411130840215473E-8 1.114607982350454E-11
node 8.671669558268447E-15 -2.430229844419596E-14 4.53052166356719E-12 5.925187522046184E-10 -5.828533333371692E-10 -2.135329404491569E-11
peri -1.988975885281152E-14 9.225084214898033E-13 4.411130840215473E-8 -5.828533333371692E-10 8.603777089609389E-9 2.304273218460297E-11
i 5.223748445107941E-16 -1.384373527712798E-15 1.114607982350454E-11 -2.135329404491569E-11 2.304273218460297E-11 1.915334181987561E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.16   n/a MPO636521  
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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