C/2012 S1 (ISON)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion29 Nov 2013-2.50.042 AU0.969 AU16h22m-19°19'2.2°113.4°20°
Nearest approach27 Dec 20136.71.012 AU0.435 AU16h18m+53°10'81.1°73.8°331°
Today23 Sep 201824.416.553 AU16.858 AU07h40m+37°06'70.6°3.3°286°
C/2012 S1 (ISON) - 2018-09-23

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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)         : 0.012501
            i (inclination)                 : 64.2063
            Ω (Longitude of ascending node) : 295.0071
            ω (Argument of perihelion)      : 345.8789
            L (Longitude of perihelion)     : 288.7599
            B (Latitude of perihelion)      : -12.6893
            T (Time of perihelion passage)  : 2456625.1798
            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]).

The all-sky chart below shows the path of of the comet over the same period as the lightcurve. The comet's current position is marked yellow.