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18161 Koshiishi (2000 PZ12)
Classification: Main-belt Asteroid          SPK-ID: 2018161
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet has stopped working because of a recent Java upgrade, here is a possible workaround.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 15 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1012669204071266 8.3007e-08  
a 2.9965501893602 2.9426e-08 au
q 2.693098779838301 2.6159e-07 au
i 9.571781121284083 7.4336e-06 deg
node .7922879765285396 3.0493e-05 deg
peri 5.819800823266738 4.31e-05 deg
M 46.23711116634388 2.7808e-05 deg
tp 2457357.156947031725
0.0001465 JED
period 1894.657708034879
n .1900079357201616 2.7988e-09 deg/d
Q 3.3000015988821 3.2406e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1199  
   data-arc span      13213 days (36.18 yr)  
   first obs. used      1979-11-17  
   last obs. used      2016-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .45915  
   data source      ORB  
   producer      Otto Matic  
   solution date      2016-Feb-25 19:18:49  

Additional Information
 Earth MOID = 1.6904 au 
 Jupiter MOID = 2.14724 au 
 T_jup = 3.225 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 12.2 mag n/a MPO347666  

18161 Koshiishi           Discovered 2000 Aug. 7 by BATTeRS at Bisei Spaceguard Center.
Hajime Koshiishi (b. 1930) became interested in investigating minor planets as a natural resource. He organized a society for the study of NEAs and their resource utilization and made efforts toward the establishment of the Japan Spaceguard Association.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20100130/MPCPages.arcLast Updated: 2013-03-29

Alternate Designations
 2000 PZ12 = 1979 SL12 = 1979 WY4 = 1984 SY = 1989 TA14 = 1992 FV2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-05 04:47 UT
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