C/2022 L1 (Catalina)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	18 Jul 2022	16.9	1.854 AU	0.897 AU	18h58m	+04°48'	151.3°	15.2°	155°
Perihelion	27 Sep 2022	17.1	1.591 AU	2.045 AU	15h20m	+17°05'	49.6°	28.7°	73°
Today	25 May 2026	41.4	11.911 AU	12.605 AU	07h06m	+08°59'	45.0°	3.4°	111°

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 10.9 + 5 log[∆] + 23.2 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/2022 L1 (Catalina) are:

    e (Eccentricity)                : 0.9959080
    q (Perihelion distance)         : 1.5914890
    i (Inclination)                 : 123.43210
    Ω (Longitude of ascending node) : 300.02980
    ω (Argument of perihelion)      : 59.77350
    L (Longitude of perihelion)     : 256.63086
    B (Latitude of perihelion)      : 46.14348
    T (Time of perihelion passage)  : 2459849.54110
    P (Orbital period in years)     : 7670.12

    Epoch                           : 2026 May 24
    Reference                       : MPC194180

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-05-24 00:00 UT   07 06 18.8   +08 59 37    12.585   11.904   45.9    3.5   110   41.4 
2026-05-25 00:00 UT   07 06 31.0   +08 59 26    12.603   11.910   45.1    3.5   111   41.4 
2026-05-25 02:49 UT   07 06 32.4   +08 59 24    12.605   11.911   45.0    3.4   111   41.4 
2026-05-26 00:00 UT   07 06 43.3   +08 59 13    12.621   11.917   44.2    3.4   111   41.4 
2026-05-27 00:00 UT   07 06 55.8   +08 58 59    12.639   11.923   43.4    3.3   111   41.4 
2026-05-28 00:00 UT   07 07 08.5   +08 58 44    12.656   11.930   42.5    3.3   112   41.4 
2026-05-29 00:00 UT   07 07 21.3   +08 58 28    12.674   11.936   41.7    3.2   112   41.4 
2026-05-30 00:00 UT   07 07 34.3   +08 58 10    12.691   11.943   40.8    3.2   113   41.4 
2026-05-31 00:00 UT   07 07 47.5   +08 57 52    12.708   11.949   40.0    3.1   113   41.4 
2026-06-01 00:00 UT   07 08 00.7   +08 57 32    12.724   11.956   39.1    3.1   114   41.4 
2026-06-02 00:00 UT   07 08 14.2   +08 57 11    12.741   11.962   38.3    3.0   115   41.4 
2026-06-03 00:00 UT   07 08 27.8   +08 56 49    12.757   11.969   37.5    3.0   115   41.4 
2026-06-04 00:00 UT   07 08 41.5   +08 56 26    12.773   11.975   36.6    2.9   116   41.4 

    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.