C/2012 S1 (ISON)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion28 Nov 2013-6.70.012 AU0.996 AU16h21m-21°43'0.5°42.1°127°
Nearest approach26 Dec 20136.71.005 AU0.434 AU16h21m+52°15'80.1°74.7°332°
Today23 May 201924.918.087 AU18.782 AU07h13m+37°31'45.5°2.3°82°
C/2012 S1 (ISON) - 2019-05-23

-1 month
-1 week
-1 day
+1 day
+1 week
+1 month

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)                : 1.0002550
            q (perihelion distance)         : 0.01247
            i (inclination)                 : 64.74010
            Ω (Longitude of ascending node) : 294.82150
            ω (Argument of perihelion)      : 345.95600
            L (Longitude of perihelion)     : 288.72867
            B (Latitude of perihelion)      : -12.67752
            T (Time of perihelion passage)  : 2456625.48830
            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.