C/2025 K3 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	12 Aug 2025	21.5	10.212 AU	9.977 AU	18h21m	+53°42'	100.6°	5.6°	134°
Perihelion	14 Dec 2028	14.5	3.469 AU	3.538 AU	12h04m	-09°20'	78.0°	16.1°	292°
Nearest approach	24 Feb 2029	14.0	3.532 AU	2.664 AU	10h23m	-23°54'	146.6°	8.9°	3°

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.)

The orbital elements of C/2025 K3 (PANSTARRS) are:

            e (Eccentricity)                : 1.0010110
            q (Perihelion distance)         : 3.4693790
            i (Inclination)                 : 104.93350
            Ω (Longitude of ascending node) : 350.62090
            ω (Argument of perihelion)      : 188.61630
            L (Longitude of perihelion)     : 348.38474
            B (Latitude of perihelion)      : -8.32319
            T (Time of perihelion passage)  : 2462119.91790

            Epoch                           : 2025 Aug 12
            Reference                       : MPEC 2025-OF9

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

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. The light curve is based on the absolute magnitude and slope parameter as calculated from an MPEC, or the latest values provided by the minor planet center. (6.40 + 5 log[∆] + 10.00 log[r]).

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.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-08-12 00:00 UT   18 22 14.1   +53 45 14     9.980   10.217  100.8    5.6   135   21.5 
2025-08-12 20:47 UT   18 21 40.4   +53 42 08     9.977   10.212  100.6    5.6   134   21.5 
2025-08-13 00:00 UT   18 21 35.2   +53 41 38     9.977   10.211  100.6    5.6   134   21.5 
2025-08-14 00:00 UT   18 20 56.9   +53 37 58     9.973   10.205  100.4    5.6   133   21.5 
2025-08-15 00:00 UT   18 20 19.2   +53 34 13     9.970   10.199  100.3    5.6   132   21.5 
2025-08-16 00:00 UT   18 19 42.0   +53 30 23     9.966   10.193  100.1    5.6   130   21.5 
2025-08-17 00:00 UT   18 19 05.5   +53 26 28     9.963   10.186   99.9    5.6   129   21.5 
2025-08-18 00:00 UT   18 18 29.5   +53 22 29     9.960   10.180   99.7    5.6   128   21.5 
2025-08-19 00:00 UT   18 17 54.1   +53 18 25     9.957   10.174   99.6    5.6   127   21.5 
2025-08-20 00:00 UT   18 17 19.4   +53 14 17     9.954   10.168   99.4    5.6   126   21.5 
2025-08-21 00:00 UT   18 16 45.2   +53 10 04     9.951   10.162   99.2    5.6   125   21.5 
2025-08-22 00:00 UT   18 16 11.7   +53 05 48     9.949   10.155   99.0    5.6   124   21.5 

    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.