C/2021 S4 (Tsuchinshan)
ephemeris date magn radius delta ra dec elong phase PA
Today23 Oct 202120.18.406 AU7.424 AU01h12m+14°21'170.3°1.1°107°
Nearest approach8 Dec 202318.66.698 AU5.760 AU04h45m+41°45'160.7°2.8°173°
Perihelion31 Dec 202318.66.696 AU5.837 AU04h36m+41°27'148.6°4.4°116°
C/2021 S4 (Tsuchinshan)- 2021-10-23

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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 C/2021 S4 (Tsuchinshan) are:

            e (eccentricity)                : 0.9578930
            q (perihelion distance)         : 6.6958410
            i (inclination)                 : 17.46790
            Ω (Longitude of ascending node) : 5.48470
            ω (Argument of perihelion)      : 72.67810
            L (Longitude of perihelion)     : 77.37890
            B (Latitude of perihelion)      : 16.65199
            T (Time of perihelion passage)  : 2460309.70360
            P (Orbital period in years)     : 2005.29

            Epoch                           : 2021 Oct 22
            Reference                       : MPEC 2021-U31

            Classification(s):              : Ecliptic; Chiron type
            Tisserand (Jupiter)             : 3.061

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 light curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the minor planet center. (6.50 + 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.

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.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.