A/2025 A7
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	4 Mar 2025	18.5	2.894 AU	1.912 AU	10h39m	-02°00'	170.2°	3.3°	30°
Perihelion	28 Mar 2025	19.2	2.884 AU	2.095 AU	09h24m	-01°08'	134.5°	14.3°	93°
Today	31 May 2026	22.3	5.000 AU	5.751 AU	04h52m	-16°24'	38.7°	7.3°	172°

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)                : 0.9988880
    q (Perihelion distance)         : 2.8837280
    i (Inclination)                 : 133.65580
    Ω (Longitude of ascending node) : 348.86320
    ω (Argument of perihelion)      : 195.58210
    L (Longitude of perihelion)     : 337.96652
    B (Latitude of perihelion)      : -11.20651
    T (Time of perihelion passage)  : 2460762.55630
    P (Orbital period in years)     : 132060.90

    Epoch                           : 2026 May 30
    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
2026-05-30 00:00 UT   04 52 22.1   -16 26 10     5.740    4.989   38.7    7.3   170   22.3 
2026-05-31 00:00 UT   04 52 43.6   -16 25 14     5.747    4.996   38.6    7.3   172   22.3 
2026-05-31 14:23 UT   04 52 56.5   -16 24 43     5.751    5.000   38.7    7.3   172   22.3 
2026-06-01 00:00 UT   04 53 05.1   -16 24 23     5.754    5.003   38.7    7.3   173   22.3 
2026-06-02 00:00 UT   04 53 26.7   -16 23 40     5.761    5.010   38.7    7.3   174   22.3 
2026-06-03 00:00 UT   04 53 48.2   -16 23 02     5.768    5.017   38.7    7.3   176   22.3 
2026-06-04 00:00 UT   04 54 09.7   -16 22 31     5.774    5.024   38.8    7.3   177   22.3 
2026-06-05 00:00 UT   04 54 31.2   -16 22 06     5.781    5.031   38.9    7.3   179   22.3 
2026-06-06 00:00 UT   04 54 52.6   -16 21 47     5.787    5.038   39.0    7.3   180   22.4 
2026-06-07 00:00 UT   04 55 14.0   -16 21 35     5.792    5.045   39.1    7.3   181   22.4 
2026-06-08 00:00 UT   04 55 35.4   -16 21 29     5.798    5.053   39.2    7.3   183   22.4 
2026-06-09 00:00 UT   04 55 56.6   -16 21 29     5.803    5.060   39.3    7.3   184   22.4 
2026-06-10 00:00 UT   04 56 17.9   -16 21 35     5.809    5.067   39.5    7.3   185   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.