C/2025 R3 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	19 Apr 2026	3.8	0.499 AU	0.587 AU	00h28m	+16°28'	20.4°	135.4°	282°
Nearest approach	26 Apr 2026	1.3	0.523 AU	0.489 AU	02h27m	+07°56'	6.4°	167.6°	150°
Today	16 Jun 2026	10.6	1.326 AU	1.947 AU	06h54m	-11°16'	39.2°	29.0°	152°

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. This lightcurve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 8.0 + 5 log[∆] + 9.2 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)                : 1.0003560
    q (Perihelion distance)         : 0.4986200
    i (Inclination)                 : 124.73130
    Ω (Longitude of ascending node) : 38.69460
    ω (Argument of perihelion)      : 162.22560
    L (Longitude of perihelion)     : 49.04497
    B (Latitude of perihelion)      : 14.52964
    T (Time of perihelion passage)  : 2461150.39370

    Epoch                           : 2026 Jun 16
    Reference                       : MPEC 2026-L50

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-06-15 00:00 UT   06 52 39.2   -11 11 25     1.903    1.296   39.7   30.1   150   10.5 
2026-06-16 00:00 UT   06 53 41.5   -11 14 26     1.928    1.313   39.4   29.4   151   10.5 
2026-06-16 19:02 UT   06 54 30.1   -11 16 52     1.947    1.326   39.2   29.0   152   10.6 
2026-06-17 00:00 UT   06 54 42.6   -11 17 30     1.952    1.329   39.1   28.8   152   10.6 
2026-06-18 00:00 UT   06 55 42.6   -11 20 39     1.977    1.346   38.9   28.3   153   10.7 
2026-06-19 00:00 UT   06 56 41.4   -11 23 52     2.000    1.363   38.6   27.7   154   10.8 
2026-06-20 00:00 UT   06 57 39.1   -11 27 09     2.024    1.379   38.3   27.2   156   10.8 
2026-06-21 00:00 UT   06 58 35.9   -11 30 31     2.047    1.396   38.1   26.7   157   10.9 
2026-06-22 00:00 UT   06 59 31.7   -11 33 58     2.070    1.412   37.8   26.2   158   11.0 
2026-06-23 00:00 UT   07 00 26.6   -11 37 30     2.093    1.429   37.6   25.7   159   11.1 
2026-06-24 00:00 UT   07 01 20.6   -11 41 07     2.115    1.445   37.3   25.2   160   11.1 
2026-06-25 00:00 UT   07 02 13.7   -11 44 49     2.137    1.462   37.1   24.8   161   11.2 
2026-06-26 00:00 UT   07 03 06.0   -11 48 36     2.159    1.478   36.9   24.4   162   11.3 

    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.