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8167 Ishii (1991 CM3)
Classification: Main-belt Asteroid          SPK-ID: 2008167
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1315371319791125 3.3337e-08  
a 2.430007672410218 8.7156e-09 au
q 2.110371432494139 8.4536e-08 au
i 4.559472941509468 4.0555e-06 deg
node 127.365522567144 4.2686e-05 deg
peri 299.3192554971912 4.5579e-05 deg
M 339.5935459990191 1.7594e-05 deg
tp 2459078.928685826543
6.779e-05 TDB
period 1383.597899772217
n .260191201547261 1.3998e-09 deg/d
Q 2.749643912326297 9.862e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2134  
   data-arc span      24970 days (68.36 yr)  
   first obs. used      1951-08-06  
   last obs. used      2019-12-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50274  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 18:47:50  

Additional Information
 Earth MOID = 1.12876 au 
 Jupiter MOID = 2.52038 au 
 T_jup = 3.492 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5   n/a MPO502230  
diameter diameter 5.549 km 0.191 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
geometric albedo albedo 0.250   0.027 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

8167 Ishii           Discovered 1991 Feb. 14 by K. Endate and K. Watanabe at Kitami.
Named in honor of Takahiro Ishii (b. 1959), Japanese amateur astronomer and active owner of the Kamogawa Observatory, Chiba Prefecture. He is a strong supporter of neighborhood amateurs, and his contribution to popularizing and disseminating celestial photography techniques makes him welcome in gatherings nationwide. Name proposed by the discoverers following a suggestion by Y. Yamada.
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
 1991 CM3 = 1987 BP2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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