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P/2019 B2 (Groeller)
ephemeris date magn radius delta ra dec elong phase PA
Today15 Oct 202522.03.763 AU3.229 AU05h42m+04°07'115.1°13.9°278°
Perihelion24 Feb 202718.82.525 AU1.643 AU12h32m-03°15'146.1°12.6°293°
Nearest approach24 Mar 202718.72.531 AU1.536 AU12h22m+02°02'175.7°1.7°221°
P/2019 B2 (Groeller)- 2025-10-15
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. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 13.7 + 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 B2 (Groeller) are: 

    e (Eccentricity)                : 0.3576930
    q (Perihelion distance)         : 2.5248780
    i (Inclination)                 : 16.94780
    Ω (Longitude of ascending node) : 175.62160
    ω (Argument of perihelion)      : 0.52840
    L (Longitude of perihelion)     : 176.12705
    B (Latitude of perihelion)      : 0.15403
    T (Time of perihelion passage)  : 2461460.55600
    P (Orbital period in years)     : 7.79

    Epoch                           : 2025 Oct 14
    Reference                       : MPC115885

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.876

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-15 00:00 UT   05 42 39.3   +04 10 31     3.239    3.765  114.6   13.9   277   22.0 
2025-10-15 15:38 UT   05 42 42.7   +04 07 01     3.229    3.763  115.1   13.9   278   22.0 
2025-10-16 00:00 UT   05 42 44.3   +04 05 08     3.224    3.761  115.5   13.8   278   22.0 
2025-10-17 00:00 UT   05 42 48.2   +03 59 44     3.208    3.758  116.4   13.7   278   22.0 
2025-10-18 00:00 UT   05 42 51.1   +03 54 20     3.193    3.755  117.2   13.6   279   22.0 
2025-10-19 00:00 UT   05 42 52.8   +03 48 54     3.178    3.752  118.1   13.5   279   22.0 
2025-10-20 00:00 UT   05 42 53.5   +03 43 29     3.163    3.749  119.0   13.4   280   22.0 
2025-10-21 00:00 UT   05 42 53.0   +03 38 03     3.148    3.745  119.9   13.3   280   22.0 
2025-10-22 00:00 UT   05 42 51.5   +03 32 37     3.133    3.742  120.9   13.2   281   21.9 
2025-10-23 00:00 UT   05 42 48.8   +03 27 11     3.118    3.739  121.8   13.1   281   21.9 
2025-10-24 00:00 UT   05 42 45.0   +03 21 45     3.104    3.736  122.7   13.0   282   21.9 
2025-10-25 00:00 UT   05 42 40.1   +03 16 19     3.089    3.732  123.6   12.8   282   21.9 




    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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