A/2025 A1
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	29 Mar 2026	19.4	5.929 AU	5.523 AU	08h22m	+37°53'	109.3°	9.1°	111°
Nearest approach	5 Mar 2027	18.6	5.338 AU	4.512 AU	12h13m	+39°26'	143.1°	6.4°	210°
Perihelion	14 Mar 2027	18.6	5.338 AU	4.521 AU	12h10m	+40°00'	141.8°	6.6°	195°

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)                : 1.0009660
    q (Perihelion distance)         : 5.3376810
    i (Inclination)                 : 33.41380
    Ω (Longitude of ascending node) : 101.32130
    ω (Argument of perihelion)      : 68.26160
    L (Longitude of perihelion)     : 165.78853
    B (Latitude of perihelion)      : 30.76512
    T (Time of perihelion passage)  : 2461478.85940

    Epoch                           : 2026 Mar 28
    Reference                       : MPEC 2026-FC3

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-03-28 00:00 UT   08 22 19.2   +37 53 60     5.506    5.934  110.8    9.0   111   19.4 
2026-03-29 00:00 UT   08 22 22.1   +37 53 59     5.517    5.931  109.9    9.1   111   19.4 
2026-03-29 13:36 UT   08 22 24.1   +37 53 57     5.523    5.929  109.3    9.1   111   19.4 
2026-03-30 00:00 UT   08 22 25.8   +37 53 55     5.528    5.928  108.9    9.2   110   19.4 
2026-03-31 00:00 UT   08 22 30.2   +37 53 47     5.539    5.925  108.0    9.2   110   19.4 
2026-04-01 00:00 UT   08 22 35.5   +37 53 36     5.550    5.922  107.1    9.3   110   19.4 
2026-04-02 00:00 UT   08 22 41.6   +37 53 21     5.562    5.918  106.2    9.3   110   19.4 
2026-04-03 00:00 UT   08 22 48.5   +37 53 02     5.573    5.915  105.3    9.4   109   19.4 
2026-04-04 00:00 UT   08 22 56.2   +37 52 41     5.584    5.912  104.4    9.4   109   19.4 
2026-04-05 00:00 UT   08 23 04.7   +37 52 16     5.596    5.909  103.5    9.5   109   19.4 
2026-04-06 00:00 UT   08 23 14.0   +37 51 47     5.607    5.906  102.6    9.5   108   19.4 
2026-04-07 00:00 UT   08 23 24.1   +37 51 16     5.619    5.903  101.7    9.6   108   19.4 
2026-04-08 00:00 UT   08 23 35.0   +37 50 41     5.630    5.900  100.8    9.6   108   19.4 

    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.