ephemeris date magn radius delta ra dec elong phase PA
Nearest approach7 Aug 20183.80.378 AU0.758 AU07h57m+24°51'18.2°122.9°294°
Perihelion16 Aug 20181.30.209 AU0.975 AU09h26m+02°35'11.8°94.5°197°
Today23 Sep 201811.31.091 AU2.037 AU11h57m+13°49'14.0°12.9°355°
C/2017 S3 (PANSTARRS) - 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/2017 S3 (PANSTARRS), as provided by the minor planet center, are:

            e (eccentricity)                : 1.000481
            q (perihelion distance)         : 0.208511
            i (inclination)                 : 99.0391
            Ω (Longitude of ascending node) : 171.0352
            ω (Argument of perihelion)      : 255.7932
            L (Longitude of perihelion)     : 139.2124
            B (Latitude of perihelion)      : -73.2115
            T (Time of perihelion passage)  : 2458346.4620
            P (Orbital period in years)     : > 9999.99 

            Family/Group:                   : Nearly isotropic

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 Two lightcurves are shown: The gray curve is based on the absolute magnitide and slope parameter as provided by the minor planet center (11.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 9.43 + 5 log[∆] + 11.83 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.