ephemeris date magn radius delta ra dec elong phase PA
Nearest approach4 Mar 20130.50.320 AU1.089 AU23h55m-16°05'16.9°64.0°123°
Perihelion8 Mar 20130.20.296 AU1.098 AU00h14m-05°54'15.3°61.8°93°
Today18 Oct 202125.823.302 AU23.943 AU16h20m+17°07'49.0°1.8°60°
C/2011 L4 (PANSTARRS)- 2021-10-18

-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/2011 L4 (PANSTARRS) are:

            e (eccentricity)                : 0.9998370
            q (perihelion distance)         : 0.2963480
            i (inclination)                 : 84.04880
            Ω (Longitude of ascending node) : 65.86430
            ω (Argument of perihelion)      : 333.47960
            L (Longitude of perihelion)     : 62.90247
            B (Latitude of perihelion)      : -26.36641
            T (Time of perihelion passage)  : 2456359.52500

            Epoch                           : 2020 Sep 26
            Reference                       : MPC115880

            Classification(s):              : Nearly isotropic; New (a > 10000 AU)

The light curve 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 gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (5.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 5.24 + 5 log[∆] + 9.97 log[r]).

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