C/2017 O1 (ASASSN)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion14 Oct 201710.51.495 AU0.716 AU04h41m+50°56'120.6°35.0°242°
Nearest approach17 Oct 201710.51.496 AU0.715 AU04h43m+53°58'120.9°34.9°240°
Today19 Sep 202024.810.188 AU11.146 AU12h43m+10°13'16.7°1.6°59°
C/2017 O1 (ASASSN)- 2020-09-19

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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 O1 (ASASSN), as provided by the minor planet center, are:

            e (eccentricity)                : 0.9958100
            q (perihelion distance)         : 1.4951670
            i (inclination)                 : 39.89480
            Ω (Longitude of ascending node) : 25.76610
            ω (Argument of perihelion)      : 20.84760
            L (Longitude of perihelion)     : 42.05290
            B (Latitude of perihelion)      : 13.19445
            T (Time of perihelion passage)  : 2458041.31840
            P (Orbital period in years)     : 6740.83
            Epoch                           : 2020 Sep 18

            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. 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 (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 9.50 + 5 log[∆] + 10.00 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.