C/2021 B3 (NEOWISE)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach13 Feb 202118.22.177 AU1.869 AU05h53m-58°03'94.2°26.9°56°
Today6 Mar 202118.32.159 AU1.990 AU05h05m-38°47'85.9°27.3°86°
Perihelion11 Mar 202118.42.158 AU2.038 AU05h02m-35°13'83.1°27.2°90°
C/2021 B3 (NEOWISE)- 2021-03-06

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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 B3 (NEOWISE), as provided by the minor planet center, are:

            e (eccentricity)                : 0.9304510
            q (perihelion distance)         : 2.1582270
            i (inclination)                 : 119.50370
            Ω (Longitude of ascending node) : 67.33250
            ω (Argument of perihelion)      : 293.69350
            L (Longitude of perihelion)     : 115.62922
            B (Latitude of perihelion)      : -52.84103
            T (Time of perihelion passage)  : 2459284.68060
            P (Orbital period in years)     : 172.87

            Epoch                           : 
            Reference                       : MPEC 2021-C16

            Classification(s):              : Halley type (P < 200 years)

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. (13.50 + 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.