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C/2023 R1 (PANSTARRS)
ephemeris date magn radius delta ra dec elong phase PA
Today16 Jan 202615.63.657 AU4.570 AU 19h25m-02°36'19.4°5.1°342°
Perihelion13 Apr 202614.83.570 AU3.398 AU 19h21m-03°41'91.6°16.3°261°
Nearest approach12 Jun 202614.33.612 AU2.626 AU 17h35m-07°07'163.7°4.5°191°
C/2023 R1 (PANSTARRS)- 2026-01-16
astro.vanbuitenen.nl


 
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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 6.6 + 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/2023 R1 (PANSTARRS) are: 

    e (Eccentricity)                : 1.0024080
    q (Perihelion distance)         : 3.5700470
    i (Inclination)                 : 149.31590
    Ω (Longitude of ascending node) : 62.56750
    ω (Argument of perihelion)      : 144.26410
    L (Longitude of perihelion)     : 94.31613
    B (Latitude of perihelion)      : 17.34011
    T (Time of perihelion passage)  : 2461143.90630

    Epoch                           : 2026 Jan 15
    Reference                       : MPEC 2026-A24

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-01-15 00:00 UT   19 25 18.3   -02 33 39     4.573    3.659   19.3    5.1   346   15.6 
2026-01-16 00:00 UT   19 25 36.9   -02 36 01     4.571    3.658   19.4    5.1   343   15.6 
2026-01-16 06:27 UT   19 25 41.9   -02 36 39     4.570    3.657   19.4    5.1   342   15.6 
2026-01-17 00:00 UT   19 25 55.4   -02 38 20     4.568    3.656   19.5    5.1   340   15.5 
2026-01-18 00:00 UT   19 26 13.9   -02 40 34     4.566    3.654   19.6    5.2   337   15.5 
2026-01-19 00:00 UT   19 26 32.3   -02 42 45     4.562    3.652   19.8    5.2   334   15.5 
2026-01-20 00:00 UT   19 26 50.5   -02 44 51     4.559    3.650   20.0    5.3   332   15.5 
2026-01-21 00:00 UT   19 27 08.7   -02 46 54     4.555    3.648   20.3    5.4   329   15.5 
2026-01-22 00:00 UT   19 27 26.7   -02 48 52     4.551    3.646   20.6    5.5   326   15.5 
2026-01-23 00:00 UT   19 27 44.6   -02 50 47     4.546    3.644   21.0    5.5   324   15.5 
2026-01-24 00:00 UT   19 28 02.3   -02 52 38     4.542    3.642   21.4    5.7   321   15.5 
2026-01-25 00:00 UT   19 28 19.8   -02 54 26     4.536    3.641   21.8    5.8   319   15.5 
2026-01-26 00:00 UT   19 28 37.2   -02 56 10     4.531    3.639   22.2    5.9   317   15.5 




    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.

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