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6731 Hiei (1992 BK)
Classification: Main-belt Asteroid          SPK-ID: 2006731
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .231942075713868 3.1541e-08  
a 2.638047050369433 1.2265e-08 au
q 2.0261729416759 8.3668e-08 au
i 4.166721000211578 5.5673e-06 deg
node 352.7803230484329 5.5264e-05 deg
peri 106.0764285674558 5.677e-05 deg
M 237.6642957244692 1.3461e-05 deg
tp 2459532.330154773974
(2021-Nov-13.83015477)
6.0078e-05 TDB
period 1565.028434278001
4.28
1.0914e-05
2.988e-08
d
yr
n .2300277695376696 1.6041e-09 deg/d
Q 3.249921159062966 1.5109e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1270  
   data-arc span      25744 days (70.48 yr)  
   first obs. used      1948-12-10  
   last obs. used      2019-06-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50335  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:10:37  

Additional Information
 Earth MOID = 1.04769 au 
 Jupiter MOID = 1.941 au 
 T_jup = 3.354 
[ 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 13.9   n/a MPO395064  
diameter diameter 7.983 km 0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.092   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6731 Hiei           Discovered 1992 Jan. 24 by Y. Kushida and O. Muramatsu at Yatsugatake South Base Observatory.
Named in honor of Eijiro Hiei (b. 1931), professor at Meisei University and professor emeritus of the National Astronomical Observatory of Japan. A solar physicist best known for his research on white-light flares, Hiei was the fourth director (1982-1992) of the Norikura Solar Observatory, where he conducted coronagraphic studies. Name proposed by the discoverers following a suggestion by T. Sakurai.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19961026/MPCPages.arcLast Updated: 2003-09-26

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Alternate Designations
 1992 BK = 1948 XG = 1982 VX9 = 1990 RY5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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