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318P/McNaught-Hartley
Classification: Jupiter-family Comet          SPK-ID: 1000153
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456030.5 (2012-Apr-13.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .67524419930809 1.6479e-07  
a 7.530147858980992 5.7069e-07 au
q 2.445459197271844 1.2722e-06 au
i 17.89485253850064 1.8712e-05 deg
node 35.75431008823115 8.6641e-05 deg
peri 313.1772198940606 0.00011788 deg
M 298.6596609806991 6.9738e-06 deg
tp 2457316.518907888869
(2015-Oct-21.01890789)
0.0002789 TDB
period 7547.509750383337
20.66
0.000858
2.349e-06
d
yr
n .04769785159690793 5.4223e-09 deg/d
Q 12.61483652069014 9.5604e-07 au
  Orbit Determination Parameters
   # obs. used (total)      442  
   data-arc span      8165 days (22.35 yr)  
   first obs. used      1994-07-05  
   last obs. used      2016-11-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .76497  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:28:23  

Additional Information
 Earth MOID = 1.47985 au 
 Jupiter MOID = .690255 au 
 T_jup = 2.380 
[ 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 9.6   0.9 29 2 parameter fit from 140 observations, autocmod 2.9c
comet total magnitude slope K1 13.5   n/a 29 autocmod 2.9c
comet nuclear magnitude M2 13.9   0.6 29 from 220 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 29 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 29 autocmod 2.9c

[ show close-approach data ]
Alternate Designations
 Perihelion 
Year
(est.)
 New-Style 
Desig
Roman
 Numeral 
Year/
 Letter 
 2015.8   318P/2014 M6       
 1995.1   318P/1994 N2   1994 XXXI   1994n 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ]
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