C/2021 Y1 (ATLAS)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach12 Dec 202214.12.612 AU1.689 AU03h59m+05°37'154.5°9.4°45°
Perihelion30 Apr 202313.82.032 AU2.513 AU04h42m-24°16'50.8°22.6°137°
Today4 Dec 202317.03.220 AU4.013 AU15h10m-48°46'32.0°9.3°222°
C/2021 Y1 (ATLAS)- 2023-12-04

-1 month
-1 week
-1 day
+1 day
+1 week
+1 month

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 Y1 (ATLAS) are:

            e (Eccentricity)                : 1.0010130
            q (Perihelion distance)         : 2.0324730
            i (Inclination)                 : 77.19210
            Ω (Longitude of ascending node) : 244.76800
            ω (Argument of perihelion)      : 245.82690
            L (Longitude of perihelion)     : 271.05217
            B (Latitude of perihelion)      : -62.82466
            T (Time of perihelion passage)  : 2460065.23050

            Epoch                           : 2023 Dec 03
            Reference                       : MPEC 2023-N01

            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 (7.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 8.40 + 5 log[∆] + 10.95 log[r]).