C/2019 T4 (ATLAS)
ephemeris date magn radius delta ra dec elong phase PA
Today20 Oct 202113.44.656 AU5.376 AU11h02m-25°14'39.9°7.9°255°
Nearest approach4 Apr 202211.84.277 AU3.331 AU11h50m-20°40'158.6°4.9°48°
Perihelion9 Jun 202212.14.242 AU3.898 AU11h51m-07°30'102.9°13.5°112°
C/2019 T4 (ATLAS)- 2021-10-20

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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/2019 T4 (ATLAS) are:

            e (eccentricity)                : 0.9958350
            q (perihelion distance)         : 4.2422690
            i (inclination)                 : 53.62420
            Ω (Longitude of ascending node) : 199.94200
            ω (Argument of perihelion)      : 351.21180
            L (Longitude of perihelion)     : 194.70329
            B (Latitude of perihelion)      : -7.06596
            T (Time of perihelion passage)  : 2459739.71360

            Epoch                           : 2021 Oct 19
            Reference                       : MPEC 2021-TD0

            Classification(s):              : Nearly isotropic; New (a > 10000 AU)

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 (5.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently -.24 + 5 log[∆] + 14.99 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.

The following chart shows the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly version of the same chart can be found further down this page as well.