Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
31324 Jirimrazek (1998 HR31)
Classification: Main-belt Asteroid          SPK-ID: 2031324
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457381.5 (2015-Dec-25.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02554815516994461 4.3206e-08  
q 2.978331368910787 1.3166e-07 au
tp 2458025.853034490946
(2017-Sep-29.35303449)
0.00049549 TDB
node 100.9471944215689 2.5074e-05 deg
peri 324.6848712797733 9.3317e-05 deg
i 9.821485986279294 4.4925e-06 deg
  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
 Jupiter MOID = 2.0009 au 
 T_jup = 3.211 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.866733405404097E-15 -5.625260319268958E-15 8.414235558712039E-13 1.01396992368396E-14 1.225600827466015E-13 5.684733859910954E-16
q -5.625260319268958E-15 1.733347636237767E-14 2.554194616115608E-12 -2.798008798325359E-14 5.351050888894756E-13 -1.545413881651252E-15
tp 8.414235558712039E-13 2.554194616115608E-12 2.455068211391149E-7 2.419874909213416E-11 4.455878266319806E-8 9.036063496955062E-12
node 1.01396992368396E-14 -2.798008798325359E-14 2.419874909213416E-11 6.286841913201637E-10 -6.149523698799475E-10 -2.745052539422434E-11
peri 1.225600827466015E-13 5.351050888894756E-13 4.455878266319806E-8 -6.149523698799475E-10 8.708007446417912E-9 2.865409139802179E-11
i 5.684733859910954E-16 -1.545413881651252E-15 9.036063496955062E-12 -2.745052539422434E-11 2.865409139802179E-11 2.018250079005529E-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 14.14   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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Jul-25 23:46 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin