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P/2019 GG21 (PANSTARRS)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach25 Mar 201920.33.955 AU2.959 AU 12h00m-03°19'175.9°1.0°66°
Perihelion13 May 201920.53.944 AU3.269 AU 11h45m-02°16'125.6°12.0°111°
Today12 May 202627.210.211 AU10.655 AU 23h23m-03°23'61.5°5.0°247°
P/2019 GG21 (PANSTARRS)- 2026-05-12
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.)


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. (12.0 + 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 P/2019 GG21 (PANSTARRS) are: 

    e (Eccentricity)                : 0.4730650
    q (Perihelion distance)         : 3.9439040
    i (Inclination)                 : 6.07230
    Ω (Longitude of ascending node) : 340.53260
    ω (Argument of perihelion)      : 209.14920
    L (Longitude of perihelion)     : 9.54486
    B (Latitude of perihelion)      : -2.95350
    T (Time of perihelion passage)  : 2458616.63380
    P (Orbital period in years)     : 20.48

    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
2026-05-11 00:00 UT   23 23 09.8   -03 26 43    10.679   10.209   59.8    4.9   247   27.2 
2026-05-12 00:00 UT   23 23 24.4   -03 24 57    10.666   10.210   60.7    4.9   247   27.2 
2026-05-12 21:20 UT   23 23 37.2   -03 23 25    10.655   10.211   61.5    5.0   247   27.2 
2026-05-13 00:00 UT   23 23 38.8   -03 23 14    10.653   10.211   61.6    5.0   247   27.2 
2026-05-14 00:00 UT   23 23 52.9   -03 21 32    10.640   10.213   62.5    5.0   247   27.2 
2026-05-15 00:00 UT   23 24 06.7   -03 19 52    10.627   10.214   63.4    5.1   247   27.2 
2026-05-16 00:00 UT   23 24 20.2   -03 18 13    10.613   10.215   64.3    5.1   247   27.2 
2026-05-17 00:00 UT   23 24 33.5   -03 16 37    10.600   10.217   65.2    5.2   247   27.2 
2026-05-18 00:00 UT   23 24 46.5   -03 15 02    10.586   10.218   66.1    5.2   247   27.2 
2026-05-19 00:00 UT   23 24 59.2   -03 13 29    10.572   10.220   67.0    5.2   247   27.2 
2026-05-20 00:00 UT   23 25 11.6   -03 11 57    10.558   10.221   67.9    5.3   247   27.2 
2026-05-21 00:00 UT   23 25 23.7   -03 10 27    10.544   10.222   68.8    5.3   247   27.2 
2026-05-22 00:00 UT   23 25 35.6   -03 08 60    10.530   10.224   69.7    5.3   247   27.2 




    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.

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