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18728 Grammier (1998 KZ3)
Classification: Main-belt Asteroid          SPK-ID: 2018728
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 2456800.5 (2014-May-23.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1984025750976811 5.5954e-08  
a 2.691005133044474 2.8298e-08 AU
q 2.157102785047373 1.5628e-07 AU
i 5.432178022777944 6.0564e-06 deg
node 112.490279109913 8.6916e-05 deg
peri 8.865892704025093 9.0065e-05 deg
M 315.2957820052775 2.6779e-05 deg
tp 2457000.724038860173
(2014-Dec-09.22403886)
0.00012206 JED
period 1612.390445979203
4.41
2.5433e-05
6.963e-08
d
yr
n .2232709830908061 3.5218e-09 deg/d
Q 3.224907481041575 3.3912e-08 AU
  Orbit Determination Parameters
   # obs. used (total)      864  
   data-arc span      10952 days (29.98 yr)  
   first obs. used      1984-01-26  
   last obs. used      2014-01-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .54786  
   data source      ORB  
   producer      Otto Matic  
   solution date      2014-Jun-09 22:11:59  

Additional Information
 Earth MOID = 1.17305 AU 
 T_jup = 3.337 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.7 mag n/a MPO272729  

18728 Grammier           Discovered 1998 May 22 by the Lowell Observatory Near-Earth Object Search at the Anderson Mesa Station.
Richard ("Rick") S. Grammier (1955-2011) was director of solar system exploration at NASA's Jet Propulsion Laboratory. He worked as manager or project manager on missions such as Cassini, Stardust, Deep Impact and Juno.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120506/MPCPages.arcLast Updated: 2012-05-09

[ show close-approach data ]
Alternate Designations
 1998 KZ3 = 1984 CL1 = 1999 NF42 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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