A/2019 S4
ephemeris date magn radius delta ra dec elong phase PA
Today15 Oct 201920.93.799 AU3.278 AU04h30m+64°47'114.3°13.8°234°
Nearest approach24 Nov 201920.63.660 AU3.015 AU01h35m+72°46'124.0°12.9°139°
Perihelion7 Apr 202021.03.448 AU3.823 AU23h37m+65°46'60.9°14.7°335°
A/2019 S4- 2019-10-15

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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 A/2019 S4, as provided by the minor planet center, are:

            e (eccentricity)                : 0.9843462
            q (perihelion distance)         : 3.44774
            i (inclination)                 : 91.99602
            Ω (Longitude of ascending node) : 63.15276
            ω (Argument of perihelion)      : 71.09843
            L (Longitude of perihelion)     : 57.34454
            B (Latitude of perihelion)      : 70.99716
            T (Time of perihelion passage)  : 2458946.51537
            P (Orbital period in years)     : 3268.67

            Family/Group:                   : Nearly isotropic

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 indicates the expected brightness if this object is a comet (12.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve indicates the expected lightcurve for an asteroid (H=14.60; G=.15).

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.