C/2025 R3 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	4 Nov 2025	18.5	2.913 AU	2.151 AU	23h22m	+34°43'	132.4°	14.6°	101°
Perihelion	19 Apr 2026	7.2	0.498 AU	0.587 AU	00h28m	+16°28'	20.4°	135.4°	282°
Nearest approach	26 Apr 2026	3.7	0.523 AU	0.490 AU	02h27m	+07°56'	6.4°	167.6°	150°

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 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. (12.2 + 5 log[∆] + 10.0 log[r]). An additional green curve is displayed when an increase in apparent brightness is expected due to forward scattering of sunlight, which occurs when a dust-rich comet is located between the Earth and the Sun. (See Marcus 2007)

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 C/2025 R3 (PANSTARRS) are:

    e (Eccentricity)                : 1.0002000
    q (Perihelion distance)         : 0.4982810
    i (Inclination)                 : 124.71910
    Ω (Longitude of ascending node) : 38.68470
    ω (Argument of perihelion)      : 162.24490
    L (Longitude of perihelion)     : 49.02023
    B (Latitude of perihelion)      : 14.51623
    T (Time of perihelion passage)  : 2461150.39240

    Epoch                           : 2025 Nov 03
    Reference                       : MPEC 2025-UQ3

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-11-03 00:00 UT   23 26 29.8   +35 06 05     2.156    2.932  133.9   14.1   104   18.5 
2025-11-04 00:00 UT   23 24 05.4   +34 51 00     2.152    2.919  132.9   14.4   102   18.5 
2025-11-04 11:13 UT   23 22 58.5   +34 43 51     2.151    2.913  132.4   14.6   101   18.5 
2025-11-05 00:00 UT   23 21 43.0   +34 35 38     2.150    2.906  131.8   14.7   100   18.5 
2025-11-06 00:00 UT   23 19 22.7   +34 19 59     2.147    2.893  130.7   15.1    99   18.5 
2025-11-07 00:00 UT   23 17 04.8   +34 04 05     2.145    2.880  129.6   15.4    97   18.5 
2025-11-08 00:00 UT   23 14 49.1   +33 47 57     2.143    2.867  128.5   15.7    96   18.4 
2025-11-09 00:00 UT   23 12 35.8   +33 31 37     2.142    2.854  127.4   16.0    94   18.4 
2025-11-10 00:00 UT   23 10 24.9   +33 15 05     2.140    2.841  126.2   16.3    93   18.4 
2025-11-11 00:00 UT   23 08 16.5   +32 58 22     2.140    2.827  125.1   16.6    91   18.4 
2025-11-12 00:00 UT   23 06 10.6   +32 41 30     2.139    2.814  123.9   17.0    90   18.3 
2025-11-13 00:00 UT   23 04 07.4   +32 24 30     2.139    2.801  122.8   17.3    89   18.3 
2025-11-14 00:00 UT   23 02 06.7   +32 07 24     2.139    2.788  121.6   17.6    87   18.3 

    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.