C/2019 L1 (PANSTARRS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	24 Jul 2019	19.5	2.908 AU	1.904 AU	20h01m	-09°12'	168.9°	3.9°	165°
Perihelion	6 Aug 2019	19.6	2.906 AU	1.925 AU	19h55m	-09°02'	161.8°	6.3°	117°
Today	28 Nov 2025	29.7	12.341 AU	11.468 AU	06h19m	+20°00'	151.2°	2.2°	278°

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
2025-11-27 00:00 UT   06 20 06.9   +20 00 43    11.475   12.338  149.7    2.3   278   29.7 
2025-11-28 00:00 UT   06 19 51.2   +20 00 33    11.470   12.340  150.8    2.2   278   29.7 
2025-11-28 08:37 UT   06 19 45.5   +20 00 29    11.468   12.341  151.2    2.2   278   29.7 
2025-11-29 00:00 UT   06 19 35.3   +20 00 23    11.464   12.343  151.9    2.2   278   29.7 
2025-11-30 00:00 UT   06 19 19.1   +20 00 14    11.460   12.346  152.9    2.1   279   29.7 
2025-12-01 00:00 UT   06 19 02.8   +20 00 05    11.455   12.349  154.0    2.0   279   29.7 
2025-12-02 00:00 UT   06 18 46.3   +19 59 56    11.451   12.352  155.1    1.9   279   29.7 
2025-12-03 00:00 UT   06 18 29.7   +19 59 47    11.447   12.355  156.1    1.9   279   29.7 
2025-12-04 00:00 UT   06 18 12.9   +19 59 38    11.443   12.358  157.2    1.8   280   29.7 
2025-12-05 00:00 UT   06 17 55.9   +19 59 30    11.439   12.360  158.3    1.7   280   29.7 
2025-12-06 00:00 UT   06 17 38.7   +19 59 22    11.436   12.363  159.3    1.6   281   29.7 
2025-12-07 00:00 UT   06 17 21.5   +19 59 15    11.433   12.366  160.4    1.5   281   29.7 
2025-12-08 00:00 UT   06 17 04.1   +19 59 07    11.431   12.369  161.5    1.5   282   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.