A/2025 A1
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	9 May 2026	19.5	5.805 AU	6.003 AU	08h35m	+37°09'	74.0°	9.6°	100°
Nearest approach	5 Mar 2027	18.6	5.337 AU	4.511 AU	12h13m	+39°26'	143.1°	6.4°	210°
Perihelion	14 Mar 2027	18.6	5.337 AU	4.520 AU	12h10m	+40°01'	141.8°	6.6°	194°

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=11.20; 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 A1 are:

    e (Eccentricity)                : 1.0004750
    q (Perihelion distance)         : 5.3368350
    i (Inclination)                 : 33.40930
    Ω (Longitude of ascending node) : 101.31600
    ω (Argument of perihelion)      : 68.29910
    L (Longitude of perihelion)     : 165.82678
    B (Latitude of perihelion)      : 30.76995
    T (Time of perihelion passage)  : 2461479.16970

    Epoch                           : 2026 May 08
    Reference                       : MPEC 2026-G41

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-05-08 00:00 UT   08 34 55.9   +37 12 28     5.984    5.810   75.3    9.7   100   19.5 
2026-05-09 00:00 UT   08 35 29.4   +37 10 38     5.995    5.807   74.5    9.6   100   19.5 
2026-05-09 15:53 UT   08 35 52.0   +37 09 23     6.003    5.805   74.0    9.6   100   19.5 
2026-05-10 00:00 UT   08 36 03.6   +37 08 45     6.007    5.804   73.7    9.6   100   19.5 
2026-05-11 00:00 UT   08 36 38.4   +37 06 50     6.018    5.801   72.9    9.6   100   19.5 
2026-05-12 00:00 UT   08 37 13.9   +37 04 54     6.029    5.799   72.1    9.5    99   19.5 
2026-05-13 00:00 UT   08 37 49.9   +37 02 55     6.040    5.796   71.3    9.5    99   19.5 
2026-05-14 00:00 UT   08 38 26.6   +37 00 55     6.051    5.793   70.5    9.5    99   19.5 
2026-05-15 00:00 UT   08 39 03.9   +36 58 53     6.062    5.790   69.7    9.4    99   19.6 
2026-05-16 00:00 UT   08 39 41.7   +36 56 50     6.073    5.787   69.0    9.4    98   19.6 
2026-05-17 00:00 UT   08 40 20.2   +36 54 45     6.084    5.784   68.2    9.3    98   19.6 
2026-05-18 00:00 UT   08 40 59.2   +36 52 38     6.094    5.782   67.4    9.3    98   19.6 
2026-05-19 00:00 UT   08 41 38.8   +36 50 30     6.105    5.779   66.6    9.2    98   19.6 

    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.