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C/2011 Q2 (McNaught)
Classification: Hyperbolic Comet          SPK-ID: 1003144
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2455820.5 (2011-Sep-16.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000074961854828 3.1047e-05  
a -18003.30188335537 7456.3 au
q 1.349560902203217 4.527e-06 au
i 36.86657639635956 0.00025818 deg
node 287.3695262596481 0.00041361 deg
peri 34.62856985816699 0.0010114 deg
M -5.132355649639837E-5 3.1884e-05 deg
tp 2455946.288493365445
(2012-Jan-19.78849337)
0.0017099 TDB
period n/a
n/a
n/a
n/a
d
yr
n 4.080147167936215E-7 2.5348e-07 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      106  
   data-arc span      244 days  
   first obs. used      2011-08-26  
   last obs. used      2012-04-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .47239  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:31:55  

Additional Information
 Earth MOID = .415556 au 
 Jupiter MOID = 1.41908 au 
[ 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 4.7   0.8 12 2 parameter fit from 63 observations, autocmod 2.9c
comet total magnitude slope K1 23.25   n/a 12 autocmod 2.9c
comet nuclear magnitude M2 12.9   0.8 12 from 26 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 12 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 12 autocmod 2.9c

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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