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10609 Hirai (1996 WC3)
Classification: Main-belt Asteroid          SPK-ID: 2010609
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2006650504539794 4.1894e-08  
a 2.697703199266665 1.191e-08 au
q 2.156368450675958 1.1222e-07 au
i 10.48980070205691 4.879e-06 deg
node 199.2227766262653 2.0891e-05 deg
peri 147.8265213473832 2.3142e-05 deg
M 193.7543756015203 1.0328e-05 deg
tp 2459947.872992737089
(2023-Jan-03.37299274)
4.7964e-05 TDB
period 1618.414188998123
4.43
1.0717e-05
2.934e-08
d
yr
n .2224399677457459 1.473e-09 deg/d
Q 3.239037947857372 1.4299e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1137  
   data-arc span      9869 days (27.02 yr)  
   first obs. used      1994-03-16  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49579  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 00:42:40  

Additional Information
 Earth MOID = 1.15691 au 
 Jupiter MOID = 2.25191 au 
 T_jup = 3.316 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.80   n/a MPCxxxxx  

10609 Hirai           Discovered 1996 Nov. 28 by A. Nakamura at Kuma Kogen.
Named in honor of Yuzo Hirai (b. 1948), professor at the Institute of Information Sciences and Electronics, University of Tsukuba. His research interests include neural networks, modeling human visual information processing, associative memory and hardware implementation of neural networks. He has supervised more than 80 undergraduate and graduate students, including the discoverer of this minor planet.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1996 WC3 = 1994 FB1 = 1995 NP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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