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P/2025 A2 (PANSTARRS)
ephemeris date magn radius delta ra dec elong phase PA
Perihelion5 Oct 202421.43.447 AU3.672 AU 08h09m+00°24'69.3°15.7°275°
Nearest approach27 Jan 202520.73.498 AU2.581 AU 08h22m-06°23'154.8°6.9°9°
Today10 Nov 202522.53.993 AU4.625 AU 12h01m-06°00'45.4°10.2°288°
P/2025 A2 (PANSTARRS)- 2025-11-10
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. (13.2 + 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/2025 A2 (PANSTARRS) are: 

    e (Eccentricity)                : 0.3219880
    q (Perihelion distance)         : 3.4466410
    i (Inclination)                 : 20.73440
    Ω (Longitude of ascending node) : 189.31860
    ω (Argument of perihelion)      : 278.05660
    L (Longitude of perihelion)     : 107.92506
    B (Latitude of perihelion)      : -20.52048
    T (Time of perihelion passage)  : 2460589.18080
    P (Orbital period in years)     : 11.46

    Epoch                           : 2025 Nov 09
    Reference                       : MPC184414

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.774

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-11-09 00:00 UT   11 59 48.3   -05 54 37     4.636    3.990   44.4   10.0   288   22.5 
2025-11-10 00:00 UT   12 00 46.3   -05 59 14     4.628    3.992   45.2   10.1   288   22.5 
2025-11-10 07:22 UT   12 01 04.0   -06 00 38     4.625    3.993   45.4   10.2   288   22.5 
2025-11-11 00:00 UT   12 01 43.8   -06 03 48     4.619    3.994   45.9   10.3   288   22.5 
2025-11-12 00:00 UT   12 02 41.0   -06 08 21     4.610    3.997   46.7   10.4   288   22.5 
2025-11-13 00:00 UT   12 03 37.8   -06 12 51     4.601    3.999   47.4   10.5   289   22.5 
2025-11-14 00:00 UT   12 04 34.2   -06 17 18     4.592    4.001   48.2   10.6   289   22.5 
2025-11-15 00:00 UT   12 05 30.2   -06 21 43     4.583    4.004   48.9   10.7   289   22.5 
2025-11-16 00:00 UT   12 06 25.8   -06 26 05     4.574    4.006   49.7   10.9   289   22.5 
2025-11-17 00:00 UT   12 07 21.0   -06 30 25     4.565    4.008   50.4   11.0   289   22.5 
2025-11-18 00:00 UT   12 08 15.8   -06 34 42     4.555    4.011   51.2   11.1   289   22.5 
2025-11-19 00:00 UT   12 09 10.1   -06 38 56     4.545    4.013   52.0   11.2   289   22.5 
2025-11-20 00:00 UT   12 10 04.1   -06 43 08     4.536    4.015   52.7   11.3   290   22.5 




    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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