C/2021 G3 (PANSTARRS)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion17 Oct 202121.45.180 AU5.743 AU10h36m+18°46'51.4°8.6°300°
Nearest approach5 Feb 202220.95.247 AU4.361 AU10h28m+39°45'151.3°5.2°219°
Today28 Mar 202424.38.244 AU8.391 AU21h09m+76°21'78.1°6.8°309°
C/2021 G3 (PANSTARRS)- 2024-03-28
astro.vanbuitenen.nl


 
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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 G3 (PANSTARRS) are:

            e (Eccentricity)                : 0.9996130
            q (Perihelion distance)         : 5.1800790
            i (Inclination)                 : 102.86970
            Ω (Longitude of ascending node) : 147.38540
            ω (Argument of perihelion)      : 10.58220
            L (Longitude of perihelion)     : 145.00258
            B (Latitude of perihelion)      : 10.31342
            T (Time of perihelion passage)  : 2459505.43100
            P (Orbital period in years)     : 1548595.98

            Epoch                           : 2024 Mar 27
            Reference                       : MPEC 2022-X67

            Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (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 an MPEC, or the latest values provided by the minor planet center. (10.50 + 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.


The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.


A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.



Ephemerides:
Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2024-03-28 00:00 UT   21 08 47.9   +76 19 33     8.386    8.241   78.3    6.8   309   24.3 
2024-03-28 14:24 UT   21 09 33.9   +76 21 20     8.391    8.244   78.1    6.8   309   24.3 
2024-03-29 00:00 UT   21 10 04.2   +76 22 32     8.395    8.246   78.0    6.8   308   24.3 
2024-03-30 00:00 UT   21 11 19.3   +76 25 33     8.404    8.252   77.8    6.8   308   24.3 
2024-03-31 00:00 UT   21 12 33.2   +76 28 37     8.414    8.257   77.6    6.8   307   24.3 
2024-04-01 00:00 UT   21 13 45.9   +76 31 43     8.423    8.262   77.3    6.8   306   24.3 
2024-04-02 00:00 UT   21 14 57.4   +76 34 52     8.432    8.267   77.1    6.8   306   24.3 
2024-04-03 00:00 UT   21 16 07.5   +76 38 03     8.442    8.272   76.9    6.8   305   24.3 
2024-04-04 00:00 UT   21 17 16.5   +76 41 17     8.451    8.277   76.6    6.8   304   24.3 
2024-04-05 00:00 UT   21 18 24.1   +76 44 33     8.460    8.283   76.4    6.7   304   24.3 
2024-04-06 00:00 UT   21 19 30.5   +76 47 51     8.469    8.288   76.2    6.7   303   24.3 
2024-04-07 00:00 UT   21 20 35.5   +76 51 12     8.478    8.293   76.0    6.7   302   24.3 


    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.