A/2025 A1
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	19 Apr 2026	19.5	5.865 AU	5.766 AU	08h26m	+37°40'	90.7°	9.9°	105°
Nearest approach	5 Mar 2027	18.6	5.338 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°00'	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)                : 1.0007150
    q (Perihelion distance)         : 5.3372190
    i (Inclination)                 : 33.41150
    Ω (Longitude of ascending node) : 101.31870
    ω (Argument of perihelion)      : 68.28130
    L (Longitude of perihelion)     : 165.80880
    B (Latitude of perihelion)      : 30.76772
    T (Time of perihelion passage)  : 2461479.02300

    Epoch                           : 2026 Apr 18
    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
2026-04-18 00:00 UT   08 26 07.5   +37 42 08     5.748    5.869   92.0    9.8   105   19.5 
2026-04-19 00:00 UT   08 26 27.0   +37 41 01     5.760    5.866   91.1    9.9   105   19.5 
2026-04-19 11:53 UT   08 26 37.0   +37 40 27     5.766    5.865   90.7    9.9   105   19.5 
2026-04-20 00:00 UT   08 26 47.3   +37 39 52     5.772    5.863   90.2    9.9   105   19.5 
2026-04-21 00:00 UT   08 27 08.4   +37 38 40     5.784    5.860   89.4    9.9   104   19.5 
2026-04-22 00:00 UT   08 27 30.2   +37 37 26     5.796    5.857   88.5    9.9   104   19.5 
2026-04-23 00:00 UT   08 27 52.7   +37 36 09     5.808    5.854   87.7    9.9   104   19.5 
2026-04-24 00:00 UT   08 28 16.0   +37 34 49     5.820    5.851   86.8    9.9   104   19.5 
2026-04-25 00:00 UT   08 28 40.1   +37 33 28     5.832    5.848   86.0    9.9   103   19.5 
2026-04-26 00:00 UT   08 29 04.8   +37 32 04     5.844    5.845   85.1    9.9   103   19.5 
2026-04-27 00:00 UT   08 29 30.3   +37 30 38     5.856    5.842   84.3    9.9   103   19.5 
2026-04-28 00:00 UT   08 29 56.5   +37 29 09     5.868    5.839   83.5    9.9   103   19.5 
2026-04-29 00:00 UT   08 30 23.4   +37 27 38     5.879    5.836   82.6    9.9   102   19.5 

    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.