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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°
Today12 Oct 202622.65.955 AU5.429 AU 04h44m-27°29'117.5°8.6°296°
A/2025 A7- 2026-10-12
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)                : 0.9988170
    q (Perihelion distance)         : 2.8841540
    i (Inclination)                 : 133.65610
    Ω (Longitude of ascending node) : 348.86160
    ω (Argument of perihelion)      : 195.58810
    L (Longitude of perihelion)     : 337.96055
    B (Latitude of perihelion)      : -11.21071
    T (Time of perihelion passage)  : 2460762.53890
    P (Orbital period in years)     : 120378.95

    Epoch                           : 2026 Oct 11
    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
2026-10-11 00:00 UT   04 45 32.8   -27 18 54     5.431    5.945  116.5    8.6   294   22.6 
2026-10-12 00:00 UT   04 44 41.7   -27 25 58     5.429    5.952  117.2    8.6   295   22.6 
2026-10-12 11:38 UT   04 44 16.7   -27 29 21     5.429    5.955  117.5    8.6   296   22.6 
2026-10-13 00:00 UT   04 43 49.8   -27 32 57     5.428    5.959  117.8    8.5   296   22.6 
2026-10-14 00:00 UT   04 42 57.1   -27 39 50     5.426    5.966  118.4    8.5   297   22.6 
2026-10-15 00:00 UT   04 42 03.6   -27 46 38     5.425    5.973  119.0    8.4   299   22.6 
2026-10-16 00:00 UT   04 41 09.3   -27 53 19     5.424    5.981  119.7    8.3   300   22.6 
2026-10-17 00:00 UT   04 40 14.2   -27 59 55     5.423    5.988  120.2    8.3   301   22.6 
2026-10-18 00:00 UT   04 39 18.4   -28 06 24     5.423    5.995  120.8    8.2   302   22.6 
2026-10-19 00:00 UT   04 38 21.9   -28 12 47     5.422    6.002  121.4    8.1   304   22.6 
2026-10-20 00:00 UT   04 37 24.6   -28 19 03     5.422    6.009  122.0    8.1   305   22.6 
2026-10-21 00:00 UT   04 36 26.6   -28 25 12     5.422    6.016  122.5    8.0   306   22.6 
2026-10-22 00:00 UT   04 35 27.9   -28 31 13     5.423    6.023  123.0    8.0   307   22.6 




    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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