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C/2019 L1 (PANSTARRS)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach24 Jul 201919.52.908 AU1.904 AU 20h01m-09°12'168.9°3.9°165°
Perihelion6 Aug 201919.62.906 AU1.925 AU 19h55m-09°02'161.8°6.3°117°
Today14 Nov 202529.712.301 AU11.566 AU 06h23m+20°03'136.3°3.2°276°
C/2019 L1 (PANSTARRS)- 2025-11-14
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. 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. (13.5 + 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/2019 L1 (PANSTARRS) are: 

    e (Eccentricity)                : 0.7038980
    q (Perihelion distance)         : 2.9057290
    i (Inclination)                 : 9.97430
    Ω (Longitude of ascending node) : 254.42810
    ω (Argument of perihelion)      : 49.98940
    L (Longitude of perihelion)     : 303.98725
    B (Latitude of perihelion)      : 7.62352
    T (Time of perihelion passage)  : 2458701.73750
    P (Orbital period in years)     : 30.74

    Epoch                           : 2025 Nov 12
    Reference                       : MPEC 2023-A50

    Classification(s):              : Nearly isotropic; Returning (a < 10000 AU); Halley type (P < 200 years)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-11-13 00:00 UT   06 23 22.5   +20 03 33    11.579   12.297  134.9    3.3   276   29.7 
2025-11-14 00:00 UT   06 23 10.3   +20 03 19    11.570   12.300  136.0    3.2   276   29.7 
2025-11-14 08:51 UT   06 23 05.7   +20 03 14    11.566   12.301  136.3    3.2   276   29.7 
2025-11-15 00:00 UT   06 22 57.7   +20 03 05    11.561   12.303  137.0    3.1   276   29.7 
2025-11-16 00:00 UT   06 22 44.9   +20 02 52    11.552   12.306  138.1    3.1   276   29.7 
2025-11-17 00:00 UT   06 22 31.8   +20 02 39    11.544   12.309  139.1    3.0   276   29.7 
2025-11-18 00:00 UT   06 22 18.4   +20 02 26    11.536   12.312  140.2    2.9   276   29.7 
2025-11-19 00:00 UT   06 22 04.8   +20 02 13    11.528   12.315  141.2    2.9   276   29.7 
2025-11-20 00:00 UT   06 21 50.9   +20 02 01    11.521   12.318  142.3    2.8   276   29.7 
2025-11-21 00:00 UT   06 21 36.7   +20 01 49    11.513   12.320  143.4    2.7   277   29.7 
2025-11-22 00:00 UT   06 21 22.4   +20 01 37    11.506   12.323  144.4    2.7   277   29.7 
2025-11-23 00:00 UT   06 21 07.7   +20 01 26    11.500   12.326  145.5    2.6   277   29.7 
2025-11-24 00:00 UT   06 20 52.9   +20 01 15    11.493   12.329  146.5    2.5   277   29.7 




    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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