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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°
Today15 Dec 202522.44.076 AU4.251 AU 12h30m-08°10'73.1°13.4°292°
P/2025 A2 (PANSTARRS)- 2025-12-15
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. 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)                : 0.3219580
    q (Perihelion distance)         : 3.4467340
    i (Inclination)                 : 20.73440
    Ω (Longitude of ascending node) : 189.31860
    ω (Argument of perihelion)      : 278.05990
    L (Longitude of perihelion)     : 107.92858
    B (Latitude of perihelion)      : -20.52030
    T (Time of perihelion passage)  : 2460589.18860
    P (Orbital period in years)     : 11.46

    Epoch                           : 2025 Dec 14
    Reference                       : MPC184414

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-14 00:00 UT   12 29 11.0   -08 06 40     4.267    4.073   72.0   13.3   292   22.4 
2025-12-15 00:00 UT   12 29 51.8   -08 09 20     4.255    4.075   72.9   13.3   292   22.4 
2025-12-15 07:44 UT   12 30 04.9   -08 10 10     4.251    4.076   73.1   13.4   292   22.4 
2025-12-16 00:00 UT   12 30 32.1   -08 11 55     4.242    4.077   73.7   13.4   292   22.4 
2025-12-17 00:00 UT   12 31 11.6   -08 14 25     4.230    4.080   74.6   13.4   292   22.4 
2025-12-18 00:00 UT   12 31 50.6   -08 16 51     4.217    4.082   75.4   13.5   292   22.4 
2025-12-19 00:00 UT   12 32 28.8   -08 19 12     4.205    4.085   76.3   13.5   292   22.4 
2025-12-20 00:00 UT   12 33 06.5   -08 21 28     4.192    4.087   77.1   13.6   292   22.4 
2025-12-21 00:00 UT   12 33 43.4   -08 23 39     4.179    4.089   78.0   13.6   292   22.4 
2025-12-22 00:00 UT   12 34 19.6   -08 25 45     4.167    4.092   78.8   13.6   292   22.4 
2025-12-23 00:00 UT   12 34 55.2   -08 27 46     4.154    4.094   79.7   13.7   292   22.4 
2025-12-24 00:00 UT   12 35 30.1   -08 29 42     4.141    4.097   80.6   13.7   292   22.4 
2025-12-25 00:00 UT   12 36 04.2   -08 31 33     4.128    4.099   81.5   13.7   293   22.4 




    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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