C/2012 S1 (ISON)
ephemeris date magn radius delta ra dec elong phase
Perihelion29 Nov 2013-1.50.057 AU0.957 AU16h21m-18°37'2.9°119.4°
Nearest approach27 Dec 20136.71.016 AU0.435 AU16h17m+53°40'81.6°73.3°
Today21 Apr 201824.015.529 AU15.784 AU07h06m+38°13'73.5°3.6°
C/2012 S1 (ISON) - 2018-04-21

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The interactive orbit chart above shows the comet's path through the solar system and its position at the given date. Green and blue lines are shown perpendicular to the ecliptic plane: Green if the path is above the ecliptic plane, blue if it is below. (Left-click and drag to rotate the view; Right-click and drag to move the view; Use scroll wheel to zoom in our out.)

The orbital elements of C/2012 S1 (ISON), as provided by the minor planet center, are:

            e (eccentricity)                : 1.000255
            q (perihelion distance)         : 0.012545
            i (inclination)                 : 63.7912
            Ω (Longitude of ascending node) : 295.1537
            ω (Argument of perihelion)      : 345.8201
            L (Longitude of perihelion)     : 288.7865
            B (Latitude of perihelion)      : -12.6962
            T (Time of perihelion passage)  : 2456625.0239
            P (Orbital period in years)     : > 9999.99 

            Family/Group:                   : Sungrazer

The lightcurve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC The lightcurve is based on the absolute magnitide and slope parameter as provided the minor planet center (8.50 + 5 log[∆] + 8.00 log[r]).