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JPL Small-Body Database Browser
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18D/Perrine-Mrkos
Classification: Jupiter-family Comet [NEO]          SPK-ID: 1000144
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

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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 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 TDB
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  
   norm. resid. RMS      1.6514  
   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 | Mission Design | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 11.5   n/a ICQ 2002 Handbook  
comet total magnitude slope K1 20.0   n/a ICQ 2002 Handbook  
comet nuclear magnitude M2 15.5   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 | Mission Design | Physical Parameters | Close-Approach Data ]
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