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A/2025 A7
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach4 Mar 202518.52.894 AU1.912 AU 10h39m-02°00'170.2°3.3°30°
Perihelion28 Mar 202519.22.884 AU2.095 AU 09h24m-01°08'134.5°14.3°93°
Today7 Sep 202622.75.703 AU5.585 AU 05h05m-22°56'91.6°10.2°264°
A/2025 A7- 2026-09-07
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 displayed light curve is calculated under the assumption that the object remains inactive. (H=14.50; G=.15).



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 A/2025 A7 are: 

    e (Eccentricity)                : 0.9988330
    q (Perihelion distance)         : 2.8840290
    i (Inclination)                 : 133.65590
    Ω (Longitude of ascending node) : 348.86250
    ω (Argument of perihelion)      : 195.58670
    L (Longitude of perihelion)     : 337.96250
    B (Latitude of perihelion)      : -11.20976
    T (Time of perihelion passage)  : 2460762.54450
    P (Orbital period in years)     : 122855.09

    Epoch                           : 2026 Sep 06
    Reference                       : MPC194194

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); External (P > 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-09-06 00:00 UT   05 06 00.0   -22 47 01     5.593    5.694   90.6   10.2   263   22.7 
2026-09-07 00:00 UT   05 05 40.1   -22 54 46     5.587    5.702   91.4   10.2   264   22.7 
2026-09-07 06:29 UT   05 05 34.6   -22 56 52     5.585    5.703   91.6   10.2   264   22.7 
2026-09-08 00:00 UT   05 05 19.4   -23 02 33     5.581    5.709   92.2   10.2   265   22.7 
2026-09-09 00:00 UT   05 04 57.8   -23 10 23     5.574    5.716   93.0   10.1   265   22.7 
2026-09-10 00:00 UT   05 04 35.4   -23 18 14     5.568    5.723   93.7   10.1   266   22.7 
2026-09-11 00:00 UT   05 04 12.0   -23 26 06     5.562    5.730   94.5   10.1   267   22.7 
2026-09-12 00:00 UT   05 03 47.8   -23 33 60     5.556    5.737   95.3   10.1   267   22.7 
2026-09-13 00:00 UT   05 03 22.7   -23 41 55     5.550    5.744   96.0   10.0   268   22.7 
2026-09-14 00:00 UT   05 02 56.7   -23 49 51     5.545    5.752   96.8   10.0   269   22.7 
2026-09-15 00:00 UT   05 02 29.8   -23 57 48     5.539    5.759   97.6   10.0   270   22.7 
2026-09-16 00:00 UT   05 02 02.0   -24 05 46     5.533    5.766   98.4    9.9   271   22.7 
2026-09-17 00:00 UT   05 01 33.3   -24 13 44     5.528    5.773   99.1    9.9   271   22.7 




    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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