C/2019 L3 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	6 Jan 2022	9.4	3.560 AU	2.586 AU	07h06m	+31°48'	170.6°	2.6°	174°
Perihelion	10 Jan 2022	9.4	3.560 AU	2.588 AU	07h02m	+31°10'	169.6°	2.9°	151°
Today	16 Sep 2025	17.0	10.967 AU	11.487 AU	12h33m	-52°57'	56.6°	4.4°	163°

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.)

The orbital elements of C/2019 L3 (ATLAS) are:

            e (Eccentricity)                : 1.0032590
            q (Perihelion distance)         : 3.5596230
            i (Inclination)                 : 48.34660
            Ω (Longitude of ascending node) : 290.71230
            ω (Argument of perihelion)      : 171.76860
            L (Longitude of perihelion)     : 285.22045
            B (Latitude of perihelion)      : 6.14094
            T (Time of perihelion passage)  : 2459589.67170

            Epoch                           : 2025 Sep 15
            Reference                       : MPC185656

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

The light curve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC. The gray curve is based on the absolute magnitude and slope parameter as calculated from the original MPEC, or the latest values provided by the MPC (4.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 2.35 + 5 log[∆] + 9.03 log[r]).

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.
A more printer-friendly version of the same chart can be found further down this page as well.

The following chart shows the current location of the comet in a smaller, upside-down telescopic field of view.

A printable version of the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.

Ephemerides:

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-09-16 00:00 UT   12 33 04.5   -52 56 31    11.475   10.961   57.1    4.4   162   17.0 
2025-09-16 21:09 UT   12 33 38.1   -52 57 20    11.487   10.967   56.6    4.4   163   17.0 
2025-09-17 00:00 UT   12 33 42.7   -52 57 26    11.489   10.968   56.6    4.4   163   17.0 
2025-09-18 00:00 UT   12 34 20.9   -52 58 25    11.502   10.974   56.1    4.4   164   17.0 
2025-09-19 00:00 UT   12 34 59.2   -52 59 26    11.516   10.980   55.6    4.3   165   17.0 
2025-09-20 00:00 UT   12 35 37.6   -53 00 31    11.529   10.986   55.1    4.3   166   17.1 
2025-09-21 00:00 UT   12 36 16.0   -53 01 39    11.542   10.992   54.6    4.3   166   17.1 
2025-09-22 00:00 UT   12 36 54.5   -53 02 51    11.555   10.998   54.2    4.2   167   17.1 
2025-09-23 00:00 UT   12 37 33.1   -53 04 06    11.568   11.004   53.7    4.2   168   17.1 
2025-09-24 00:00 UT   12 38 11.7   -53 05 23    11.580   11.010   53.3    4.2   169   17.1 
2025-09-25 00:00 UT   12 38 50.3   -53 06 44    11.593   11.016   52.8    4.2   170   17.1 
2025-09-26 00:00 UT   12 39 29.0   -53 08 09    11.605   11.022   52.4    4.1   171   17.1 

    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.