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JPL Small-Body Database Browser
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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 10 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.007777280741637 0.010022  
a -57.76749593512896 74.22 au
q .4492740336288705 0.0017022 au
i 87.4776313641521 0.04407 deg
node 289.3733322099498 0.16091 deg
peri 93.0532977908817 0.43471 deg
M -.07496369972746331 0.14414 deg
tp 2454636.894292912354
(2008-Jun-19.39429291)
0.14611 TDB
period n/a
n/a
n/a
n/a
d
yr
n .002244805719474629 0.0043262 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.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .18097  
   source      ORB  
   producer      Giorgini  
   solution date      2017-Nov-14 00:57:08  

Additional Information
 Earth MOID = .0434684 au 
 Jupiter MOID = 3.46595 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 10 2 parameter fit from 9 observations, autocmod 2.6k
comet total magnitude slope K1 13.   n/a 10 autocmod 2.6k
comet nuclear magnitude M2 18.2   0.1 10 from 6 observations, autocmod 2.6k
comet nuclear magnitude slope K2 5.   n/a 10 autocmod 2.6k
comet nuclear phase coefficient PC 0.03   n/a 10 autocmod 2.6k
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters ]
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