C/2020 S3 (Erasmus)
ephemeris date magn radius delta ra dec elong phase PA
Today25 Oct 202010.41.181 AU1.270 AU09h54m-04°18'61.5°47.7°282°
Nearest approach18 Nov 20207.90.729 AU1.038 AU12h37m-19°02'42.1°65.3°278°
Perihelion12 Dec 20205.70.399 AU1.288 AU16h22m-22°38'13.2°34.3°275°
C/2020 S3 (Erasmus)- 2020-10-25

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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/2020 S3 (Erasmus), as provided by the minor planet center, are:

            e (eccentricity)                : 0.9987260
            q (perihelion distance)         : 0.3991790
            i (inclination)                 : 19.86360
            Ω (Longitude of ascending node) : 223.01960
            ω (Argument of perihelion)      : 349.78930
            L (Longitude of perihelion)     : 213.40471
            B (Latitude of perihelion)      : -3.45317
            T (Time of perihelion passage)  : 2459196.17160
            P (Orbital period in years)     : 5546.22
            Epoch                           : 2020 Oct 24

            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 (13.50 + 5 log[∆] + 8.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 9.18 + 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.