ephemeris date magn radius delta ra dec elong phase PA
Perihelion6 Aug 202117.30.796 AU0.274 AU11h06m+34°21'32.3°137.1°64°
Nearest approach12 Aug 202117.30.805 AU0.265 AU10h28m+45°29'33.1°136.6°26°
Today23 Oct 202122.41.467 AU0.550 AU03h33m+42°18'141.8°24.8°223°
P/2021 HS (PANSTARRS)- 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 P/2021 HS (PANSTARRS) are:

            e (eccentricity)                : 0.8101580
            q (perihelion distance)         : 0.7964380
            i (inclination)                 : 12.17110
            Ω (Longitude of ascending node) : 262.39070
            ω (Argument of perihelion)      : 46.08600
            L (Longitude of perihelion)     : 307.82566
            B (Latitude of perihelion)      : 8.73585
            T (Time of perihelion passage)  : 2459432.88700
            P (Orbital period in years)     : 8.59

            Epoch                           : 2021 Oct 22
            Reference                       : MPEC 2021-U31

            Classification(s):              : Ecliptic; Jupiter family
            Tisserand (Jupiter)             : 2.269

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. (22.00 + 5 log[∆] + 10.00 log[r]). The additional green curve shows the effect of forward scattering, occurring when the comet is between the earth and the sun, for a gas-to-dust light ratio δ90 of 0.30. (See Marcus 2007)

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.