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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 2455984.5 (2012-Feb-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .675312917422262 1.636e-07  
a 7.534044801323027 5.5276e-07 au
q 2.446207026551548 1.2615e-06 au
i 17.89304904631949 1.8277e-05 deg
node 35.75501156814667 8.495e-05 deg
peri 313.1475866474407 0.00011638 deg
M 296.5277608378112 7.0907e-06 deg
tp 2457316.247969428658
(2015-Oct-20.74796943)
0.0002821 TDB
period 7553.36939932503
20.68
0.00083127
2.276e-06
d
yr
n .04766084921414934 5.2452e-09 deg/d
Q 12.62188257609451 9.2605e-07 au
  Orbit Determination Parameters
   # obs. used (total)      441  
   data-arc span      8165 days (22.35 yr)  
   first obs. used      1994-07-05  
   last obs. used      2016-11-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   norm. resid. RMS      .78551  
   source      ORB  
   producer      Otto Matic  
   solution date      2016-Nov-12 10:43:37  

Additional Information
 Earth MOID = 1.47965 au 
 Jupiter MOID = .69005 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 9.9   0.9 28 2 parameter fit from 140 observations, autocmod 2.6g
comet total magnitude slope K1 13.   n/a 28 autocmod 2.6g
comet nuclear magnitude M2 13.9   0.6 28 from 220 observations, autocmod 2.6g
comet nuclear magnitude slope K2 5.   n/a 28 autocmod 2.6g
comet nuclear phase coefficient PC 0.03   n/a 28 autocmod 2.6g

[ 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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