ephemeris date magn radius delta ra dec elong phase PA
Perihelion10 Sep 20187.41.013 AU0.392 AU05h49m+33°14'79.6°78.0°271°
Nearest approach10 Sep 20187.41.013 AU0.392 AU05h50m+32°41'79.6°78.0°271°
Today22 Sep 201923.43.811 AU4.676 AU10h14m-08°48'27.1°6.9°252°
21P/Giacobini-Zinner - 2019-09-22

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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 21P/Giacobini-Zinner, as provided by the minor planet center, are:

            e (eccentricity)                : 0.7104210
            q (perihelion distance)         : 1.01266
            i (inclination)                 : 31.99830
            Ω (Longitude of ascending node) : 195.38720
            ω (Argument of perihelion)      : 172.85410
            L (Longitude of perihelion)     : 189.31820
            B (Latitude of perihelion)      : 3.77950
            T (Time of perihelion passage)  : 2458371.77580
            P (Orbital period in years)     : 6.54

            Family/Group:                   : Jupiter family

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. Two light curves are shown: 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 (9.00 + 5 log[∆] + 15.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 9.36 + 5 log[∆] + 18.42 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.