C/2021 G3 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	17 Oct 2021	21.4	5.185 AU	5.747 AU	10h36m	+18°50'	51.5°	8.6°	300°
Nearest approach	5 Feb 2022	20.9	5.252 AU	4.366 AU	10h28m	+39°48'	151.3°	5.2°	219°
Today	8 Feb 2026	26.7	11.859 AU	12.164 AU	21h07m	+54°28'	69.7°	4.5°	355°

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. (10.5 + 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/2021 G3 (PANSTARRS) are:

    e (Eccentricity)                : 0.9995720
    q (Perihelion distance)         : 5.1852020
    i (Inclination)                 : 102.87760
    Ω (Longitude of ascending node) : 147.32700
    ω (Argument of perihelion)      : 10.62580
    L (Longitude of perihelion)     : 144.93270
    B (Latitude of perihelion)      : 10.35556
    T (Time of perihelion passage)  : 2459505.46190

    Epoch                           : 2026 Feb 07
    Reference                       : MPEC 2022-X67

    Classification(s):              : Nearly isotropic; New (a > 10000 AU)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-02-07 00:00 UT   21 07 00.3   +54 28 57    12.153   11.853   70.0    4.5   356   26.7 
2026-02-08 00:00 UT   21 07 34.7   +54 28 32    12.163   11.858   69.7    4.5   355   26.7 
2026-02-08 02:09 UT   21 07 37.8   +54 28 30    12.164   11.859   69.7    4.5   355   26.7 
2026-02-09 00:00 UT   21 08 09.0   +54 28 11    12.173   11.864   69.5    4.5   355   26.7 
2026-02-10 00:00 UT   21 08 43.3   +54 27 54    12.183   11.869   69.2    4.5   354   26.7 
2026-02-11 00:00 UT   21 09 17.4   +54 27 41    12.193   11.874   68.9    4.4   353   26.7 
2026-02-12 00:00 UT   21 09 51.3   +54 27 33    12.203   11.880   68.7    4.4   352   26.7 
2026-02-13 00:00 UT   21 10 25.2   +54 27 28    12.213   11.885   68.4    4.4   351   26.7 
2026-02-14 00:00 UT   21 10 58.9   +54 27 28    12.222   11.890   68.1    4.4   350   26.7 
2026-02-15 00:00 UT   21 11 32.4   +54 27 32    12.232   11.896   67.9    4.4   349   26.7 
2026-02-16 00:00 UT   21 12 05.8   +54 27 40    12.241   11.901   67.7    4.4   348   26.7 
2026-02-17 00:00 UT   21 12 39.1   +54 27 52    12.250   11.906   67.4    4.4   347   26.7 
2026-02-18 00:00 UT   21 13 12.1   +54 28 09    12.259   11.911   67.2    4.4   346   26.7 

    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.