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21047 Hodierna (1990 SE5)
Classification: Outer Main-belt Asteroid          SPK-ID: 2021047
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1757166385793742 3.6222e-08  
a 3.985596758112366 3.4124e-08 au
q 3.28526109304401 1.5492e-07 au
i 4.488648081271997 4.7165e-06 deg
node 52.24208761116521 4.7352e-05 deg
peri 290.0090546924305 4.9115e-05 deg
M 304.9838957658744 1.4784e-05 deg
tp 2459644.646041394505
(2022-Mar-06.14604139)
0.00012255 TDB
period 2906.28675235865
7.96
3.7325e-05
1.022e-07
d
yr
n .1238694012928475 1.5908e-09 deg/d
Q 4.685932423180723 4.012e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1347  
   data-arc span      13796 days (37.77 yr)  
   first obs. used      1982-10-15  
   last obs. used      2020-07-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .5231  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:37:18  

Additional Information
 Earth MOID = 2.27946 au 
 Jupiter MOID = .78326 au 
 T_jup = 3.023 
[ show covariance matrix ]

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 12.98   n/a E2021B10  
diameter diameter 16.029 km 0.544 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
geometric albedo albedo 0.052   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

21047 Hodierna           Discovered 1990 Sept. 22 by E. W. Elst at the European Southern Observatory.
Giovanni Battista Hodierna (1597-1660) was a catholic priest who taught mathematics and astronomy in Ragusa, Sicily. An enthusiastic follower of Galileo, he observed the rings of Saturn and the eclipses of Jupiter's satellites. His best-known work was Medicaeorum Ephemerides.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040928/MPCPages.arcLast Updated: 2004-09-28

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Alternate Designations
 1990 SE5 = 1998 SS60 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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