C/2020 B3 (Rankin)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	19 Oct 2019	18.7	3.344 AU	4.011 AU	10h47m	-02°47'	42.5°	11.6°	282°
Nearest approach	13 Mar 2020	18.2	3.611 AU	2.635 AU	12h20m	-03°57'	167.0°	3.6°	300°
Today	23 Sep 2020	20.7	4.557 AU	5.433 AU	13h47m	-02°47'	26.4°	5.6°	95°

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/2020 B3 (Rankin), as provided by the minor planet center, are:

            e (eccentricity)                : 0.9979020
            q (perihelion distance)         : 3.3444110
            i (inclination)                 : 20.70470
            Ω (Longitude of ascending node) : 185.82610
            ω (Argument of perihelion)      : 325.08130
            L (Longitude of perihelion)     : 152.68122
            B (Latitude of perihelion)      : -11.67604
            T (Time of perihelion passage)  : 2458776.32150
            P (Orbital period in years)     : > 9999.99 
            Epoch                           : 2020 Sep 22

            Family/Group:                   : Nearly isotropic
        

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 (13.00 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 10.47 + 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.