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21539 Josefhlavka (1998 QO4)
Classification: Main-belt Asteroid          SPK-ID: 2021539
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02520301351410362 5.9096e-08  
a 3.179543844162397 2.8014e-08 au
q 3.099409757689287 2.0146e-07 au
i 13.18579737032186 5.4648e-06 deg
node 301.1965461731724 1.9487e-05 deg
peri 44.74174403973115 8.9565e-05 deg
M 6.443755473986942 8.6753e-05 deg
tp 2459359.433446659508
(2021-May-24.93344666)
0.00049894 TDB
period 2070.835750432487
5.67
2.7369e-05
7.493e-08
d
yr
n .173842855438832 2.2975e-09 deg/d
Q 3.259677930635507 2.872e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1098  
   data-arc span      9681 days (26.51 yr)  
   first obs. used      1995-02-06  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50401  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:43:15  

Additional Information
 Earth MOID = 2.09764 au 
 Jupiter MOID = 1.97024 au 
 T_jup = 3.158 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457246.5 (2015-Aug-12.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02880229145891956 5.7055e-08  
q 3.088255023003672 1.9534e-07 au
tp 2457332.460387661930
(2015-Nov-05.96038766)
0.0004585 TDB
node 301.2895450392426 1.9513e-05 deg
peri 52.53836675008753 8.3291e-05 deg
i 13.17722114133509 5.454e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1098  
   data-arc span      9681 days (26.51 yr)  
   first obs. used      1995-02-06  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50401  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-24 22:43:15  

Additional Information
 Jupiter MOID = 1.97024 au 
 T_jup = 3.158 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.255233430146075E-15 -1.106390616265924E-14 -6.998827439270538E-12 -7.560738640410632E-16 -1.200611374855968E-12 -4.024916998921646E-15
q -1.106390616265924E-14 3.815886296870863E-14 2.459916914125891E-11 2.60748489791128E-15 4.219688460409745E-12 1.557862591072481E-14
tp -6.998827439270538E-12 2.459916914125891E-11 2.102188365001422E-7 3.027052234236618E-11 3.715031653893236E-8 1.516143538403875E-11
node -7.560738640410632E-16 2.60748489791128E-15 3.027052234236618E-11 3.807406362258446E-10 -3.652249108681694E-10 3.435547964134964E-11
peri -1.200611374855968E-12 4.219688460409745E-12 3.715031653893236E-8 -3.652249108681694E-10 6.937365204220516E-9 -3.080257810005901E-11
i -4.024916998921646E-15 1.557862591072481E-14 1.516143538403875E-11 3.435547964134964E-11 -3.080257810005901E-11 2.974641828024873E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.68   n/a E2021B10  
diameter diameter 12.046 km 0.133 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.048   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

21539 Josefhlávka           Discovered 1998 Aug. 20 by P. Pravec at Ondřejov.
Czech architect and philanthropist Josef Hlávka (1831-1908) established foundations to support students, scientists and artists. In 1891 he founded and led the Czech Academy of Science and Arts, which, until its forced abolition in 1952, brought together distinguished Czech scientists and artists.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20060219/MPCPages.arcLast Updated: 2010-06-03

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