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C/2012 S1 (ISON)
Classification: Hyperbolic Comet          SPK-ID: 1003203
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2456312.5 (2013-Jan-20.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.000004068744427 5.1798e-08  
a -3072.326380327027 39.116 AU
q .01250051083767398 4.9995e-07 AU
i 61.87726461346052 0.0020553 deg
node 295.7343547453656 0.00036356 deg
peri 345.5111016086721 0.00026624 deg
M 359.9981897404683 3.4567e-05 deg
tp 2456625.279149116822
(2013-Nov-28.77914912)		 0.0010579 JED
period n/a
n/a		 n/a
n/a		 d
yr
n 5.787660516404147E-6 1.1053e-07 deg/d
Q n/a n/a AU
   Orbit Determination Parameters
   # obs. used (total)      3765  
   data-arc span      495 days (1.36 yr)  
   first obs. used      2011-12-28  
   last obs. used      2013-05-06  
   planetary ephem.      DE405  
   SB-pert. ephem.      SB405-CPV-2  
   fit RMS      .52804  
   data source      ORB  
   producer      Otto Matic  
   solution date      2013-May-07 16:13:14  

Additional Information
 Earth MOID = .0232414 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 7.6 mag 0.5 24 from 869 observations, assumed slope, autocmod 2.5c
comet total magnitude slope K1 8.   n/a 24 autocmod 2.5c
comet nuclear magnitude M2 9.9 mag 0.5 24 from 2691 observations, autocmod 2.5c
comet nuclear magnitude slope K2 5.   n/a 24 autocmod 2.5c
comet nuclear phase coefficient PC 0.03   n/a 24 autocmod 2.5c

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)		 Body Nominal Distance (AU) Minimum Distance (AU) Maximum Distance (AU) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2013-Oct-01 17:23 < 00:01 Mars 0.0724579934151253 0.0724377648228541 0.0724782389943525 40.0731922691493 40.0730936716592 2456567.224226203 0.912383249246359 2044.92731254986 230.434011268575 61.3651708359959 41030.9290663287 T 24 CATAB v2.0c-linF95 2013-May-07 16:13:21 2013-May-07 16:13
2013-Dec-26 22:35 00:01 Earth 0.429207866972362 0.429188842161417 0.429226893318621 47.3691192843724 47.3689882304659 2456653.441137336 1.15783282550648 1976.61150236101 664.64619174199 70.6482596397145 89332.8482166657 T 24 CATAB v2.0c-linF95 2013-May-07 16:13:21 2013-May-07 16:13
[ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
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