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C/2025 W1 (Sankovich)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach11 Jul 202419.24.562 AU3.791 AU 19h24m-67°28'134.6°9.1°360°
Perihelion17 Feb 202519.24.170 AU4.595 AU 23h43m-68°28'58.9°11.7°151°
Today3 Feb 202620.25.080 AU4.871 AU 04h44m-40°31'96.6°11.1°62°
C/2025 W1 (Sankovich)- 2026-02-03
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. (9.7 + 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 C/2025 W1 (Sankovich) are: 

    e (Eccentricity)                : 0.9996180
    q (Perihelion distance)         : 4.1702610
    i (Inclination)                 : 79.80040
    Ω (Longitude of ascending node) : 95.89110
    ω (Argument of perihelion)      : 250.63730
    L (Longitude of perihelion)     : 122.63402
    B (Latitude of perihelion)      : -68.20672
    T (Time of perihelion passage)  : 2460724.23860

    Epoch                           : 2026 Feb 02
    Reference                       : MPEC 2025-YF1

    Classification(s):              : Nearly isotropic; New (a > 10000 AU)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-02-02 00:00 UT   04 45 14.8   -40 57 42     4.853    5.073   97.2   11.1    60   20.2 
2026-02-03 00:00 UT   04 44 58.3   -40 41 49     4.864    5.077   96.9   11.1    61   20.2 
2026-02-03 15:41 UT   04 44 48.2   -40 31 25     4.871    5.080   96.6   11.1    62   20.2 
2026-02-04 00:00 UT   04 44 43.0   -40 25 54     4.875    5.082   96.5   11.1    62   20.2 
2026-02-05 00:00 UT   04 44 28.9   -40 09 57     4.886    5.086   96.1   11.1    63   20.2 
2026-02-06 00:00 UT   04 44 15.9   -39 53 58     4.897    5.091   95.7   11.1    64   20.2 
2026-02-07 00:00 UT   04 44 04.1   -39 37 58     4.909    5.096   95.3   11.1    65   20.2 
2026-02-08 00:00 UT   04 43 53.4   -39 21 57     4.920    5.100   94.9   11.1    66   20.2 
2026-02-09 00:00 UT   04 43 43.8   -39 05 56     4.932    5.105   94.5   11.1    67   20.2 
2026-02-10 00:00 UT   04 43 35.3   -38 49 54     4.944    5.109   94.1   11.1    68   20.3 
2026-02-11 00:00 UT   04 43 27.8   -38 33 51     4.955    5.114   93.6   11.1    69   20.3 
2026-02-12 00:00 UT   04 43 21.5   -38 17 49     4.967    5.119   93.2   11.1    69   20.3 
2026-02-13 00:00 UT   04 43 16.2   -38 01 46     4.979    5.123   92.8   11.1    70   20.3 




    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.

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