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C/2008 J4 (McNaught)
Classification: Hyperbolic Comet          SPK-ID: 1002503
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

[ show orbit diagram ]
Orbital Elements at Epoch 2454603.5 (2008-May-17.0) TDB
Reference: JPL 11 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.007714282012768 0.010021  
a -58.23813198067299 75.431 au
q .4492653739957159 0.0017023 au
i 87.47745008862317 0.044064 deg
node 289.3723259881712 0.16091 deg
peri 93.05580369126282 0.43474 deg
M -.07405888502037952 0.14356 deg
tp 2454636.895215465805
(2008-Jun-19.39521547)
0.14611 TDB
period n/a
n/a
n/a
n/a
d
yr
n .002217649564088366 0.0043085 deg/d
Q n/a n/a au
  Orbit Determination Parameters
   # obs. used (total)      22  
   data-arc span      15 days  
   first obs. used      2008-05-10  
   last obs. used      2008-05-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   norm. resid. RMS      .18131  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-15 23:31:19  

Additional Information
 Earth MOID = .043474 au 
 Jupiter MOID = 3.46604 au 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 16.5   0.5 11 2 parameter fit from 9 observations, autocmod 2.9c
comet total magnitude slope K1 12.75   n/a 11 autocmod 2.9c
comet nuclear magnitude M2 18.2   0.1 11 from 6 observations, autocmod 2.9c
comet nuclear magnitude slope K2 5.   n/a 11 autocmod 2.9c
comet nuclear phase coefficient PC 0.03   n/a 11 autocmod 2.9c
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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