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18404 Kenichi (1993 FQ2)
Classification: Main-belt Asteroid          SPK-ID: 2018404
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 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1731409001464119 1.9536e-08  
a 2.76170106455733 1.2099e-08 au
q 2.28353765630457 5.4825e-08 au
i 9.893971680663904 7.9273e-07 deg
node 25.29885394055659 4.4657e-06 deg
peri 141.4763730705537 7.6612e-06 deg
M 26.01181335953743 6.4958e-06 deg
tp 2459079.375622990795
(2020-Aug-17.87562299)
3.0104e-05 TDB
period 1676.345094461699
4.59
1.1016e-05
3.016e-08
d
yr
n .214752917635734 1.4113e-09 deg/d
Q 3.23986447281009 1.4194e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2256  
   data-arc span      10700 days (29.30 yr)  
   first obs. used      1991-12-02  
   last obs. used      2021-03-19  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43308  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 02:43:16  

Additional Information
 Earth MOID = 1.29813 au 
 Jupiter MOID = 1.74862 au 
 T_jup = 3.298 
[ 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 13.02   n/a E2021B10  
diameter diameter 7.286 km 0.539 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.252   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

18404 Kenichi           Discovered 1993 Mar. 20 by K. Endate and K. Watanabe at Kitami.
Kenichi Miyoshi (b. 1930) is an amateur astronomer who has contributed to astronomical awareness in Ehime Prefecture over many years. He is highly respected by the many amateur astronomers he mentored.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120831/MPCPages.arcLast Updated: 2012-09-04

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Alternate Designations
 1993 FQ2 = 1993 HL7 = 1995 SW17 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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