ephemeris date magn radius delta ra dec elong phase
Today23 Jul 20189.41.227 AU0.663 AU22h54m+62°02'91.4°55.9°
Perihelion10 Sep 20186.31.013 AU0.392 AU05h48m+33°42'79.6°78.0°
Nearest approach11 Sep 20186.31.013 AU0.392 AU05h52m+31°58'79.7°78.0°
21P/Giacobini-Zinner - 2018-07-23

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

            e (eccentricity)                : 0.710471
            q (perihelion distance)         : 1.012786
            i (inclination)                 : 31.9976
            Ω (Longitude of ascending node) : 195.3934
            ω (Argument of perihelion)      : 172.8622
            L (Longitude of perihelion)     : 189.3313
            B (Latitude of perihelion)      : 3.7752
            T (Time of perihelion passage)  : 2458371.7782
            P (Orbital period in years)     : 6.54

            Family/Group:                   : Jupiter family

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 (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 8.18 + 5 log[∆] + 23.73 log[r]).