C/2020 S2 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	12 Oct 2020	19.9	1.944 AU	1.027 AU	23h02m	+05°09'	147.5°	16.0°	84°
Perihelion	21 Dec 2020	20.2	1.767 AU	1.392 AU	00h33m	-07°58'	94.6°	33.7°	66°
Today	24 Apr 2026	33.2	12.372 AU	11.434 AU	12h41m	-06°21'	158.0°	1.7°	109°

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.)

Light curve

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations from COBS. The light curve is based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (17.0 + 5 log[∆] + 10.0 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)

Charts

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.

Orbital elements

The orbital elements of C/2020 S2 (PANSTARRS) are:

    e (Eccentricity)                : 0.8276700
    q (Perihelion distance)         : 1.7671680
    i (Inclination)                 : 22.35440
    Ω (Longitude of ascending node) : 197.68550
    ω (Argument of perihelion)      : 202.48460
    L (Longitude of perihelion)     : 218.63204
    B (Latitude of perihelion)      : -8.36353
    T (Time of perihelion passage)  : 2459205.05460
    P (Orbital period in years)     : 32.84

    Epoch                           : 2026 Mar 16
    Reference                       : MPEC 2026-E44

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); Halley type (P < 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-23 00:00 UT   12 41 38.3   -06 24 18    11.420   12.367  159.5    1.6   108   33.2 
2026-04-24 00:00 UT   12 41 23.6   -06 22 22    11.429   12.370  158.5    1.7   109   33.2 
2026-04-24 10:35 UT   12 41 17.2   -06 21 32    11.434   12.372  158.0    1.7   109   33.2 
2026-04-25 00:00 UT   12 41 09.1   -06 20 28    11.439   12.374  157.4    1.8   109   33.2 
2026-04-26 00:00 UT   12 40 54.7   -06 18 34    11.449   12.378  156.4    1.9   109   33.2 
2026-04-27 00:00 UT   12 40 40.5   -06 16 41    11.459   12.381  155.4    1.9   109   33.2 
2026-04-28 00:00 UT   12 40 26.5   -06 14 49    11.470   12.385  154.3    2.0   109   33.2 
2026-04-29 00:00 UT   12 40 12.6   -06 12 58    11.480   12.388  153.3    2.1   110   33.2 
2026-04-30 00:00 UT   12 39 58.9   -06 11 08    11.491   12.392  152.3    2.2   110   33.2 
2026-05-01 00:00 UT   12 39 45.4   -06 09 19    11.503   12.395  151.2    2.2   110   33.2 
2026-05-02 00:00 UT   12 39 32.1   -06 07 31    11.514   12.399  150.2    2.3   110   33.2 
2026-05-03 00:00 UT   12 39 18.9   -06 05 44    11.526   12.403  149.2    2.4   110   33.2 
2026-05-04 00:00 UT   12 39 06.0   -06 03 58    11.538   12.406  148.1    2.5   110   33.2 

    Terminology:
            
    delta:  distance between comet and earth in AU
    radius: distance between comet and sun in AU
    magn:   magnitude (brightness) estimate    
    ra:     right ascension in hours (24h = 360deg)
    dec:    declination in degrees
    elong:  elongation in degrees (angle sun-earth-comet)    
    phase:  phase angle in degrees (angle sun-comet-earth)        
    AU:     Astronomical Unit (mean distance between earth and sun: 149597870.7 km      
    

Orbital elements usually provided by the MPC (Minor Planet Center).
Observations contributed by observers worldwide, via COBS (Comet Observation Database) or the MPC (Minor Planet Center)
Calculations by a modified version of AAPlus, a C# implementation of the AA+ project by PJ Naughter from the algorithms presented in the book "Astronomical Algorithms" by Jean Meeus.
NGC2000 dso catalog and star labels from VizieR as provided by the Strasbourg astronomical Data Center.
Tycho2 catalog from the ESO archive.