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18D/Perrine-Mrkos
Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000144
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | 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 2440240.5 (1969-Jan-19.0) TDB
Reference: JPL J682/18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 0.642580982439164 7.5964e-07  
a 3.55954221481951 4.0587e-07 AU
q 1.27224808138711 2.587e-06 AU
i 17.7589827722319 0.00011715 deg
node 240.8755466309168 0.00012112 deg
peri 166.0504171249452 0.00036915 deg
M 11.51461302314525 6.2953e-05 deg
tp 2440162.042133371453
(1968-Nov-01.54213337)
0.00043205 JED
period 2452.955381957053
6.72
0.00041954
1.149e-06
d
yr
n .1467617400006597 2.5101e-08 deg/d
Q 5.84683634825191 6.6667e-07 AU
  Orbit Determination Parameters
   # obs. used (total)      16  
   data-arc span      2584 days (7.07 yr)  
   first obs. used      1961-11-29  
   last obs. used      1968-12-26  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   condition code      1  
   fit RMS      1.6514  
   data source      ORB  
   producer      M.S.W. Keesey  
   solution date      2002-Feb-22 17:02:43  

Additional Information
 Earth MOID = .28923 AU 
 T_jup = 2.669 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 11.5 mag n/a ICQ 2002 Handbook  
comet total magnitude slope K1 20.0   n/a ICQ 2002 Handbook  
comet nuclear magnitude M2 15.5 mag n/a ICQ 2002 Handbook  
comet nuclear magnitude slope K2 15.0   n/a ICQ 2002 Handbook  

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 1968.8       1968 VIII   1968h 
 1962.1       1962 I   1961h 
 1955.4   18D/1955 U1   1955 VII   1955i 
 1908.4   18D/1909 P1   1909 III   1909b 
 1895.0   18D/1896 X1   1896 VII   1896g 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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