C/2019 E3 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	15 Nov 2023	16.8	10.313 AU	10.372 AU	04h09m	-77°25'	83.9°	5.5°	348°
Nearest approach	25 Aug 2024	16.8	10.424 AU	10.069 AU	02h50m	-67°49'	107.9°	5.3°	286°
Today	13 Jul 2025	17.1	10.807 AU	10.454 AU	01h30m	-54°54'	107.7°	5.1°	257°

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 E3 (ATLAS) are:

            e (Eccentricity)                : 0.9981100
            q (Perihelion distance)         : 10.3133110
            i (Inclination)                 : 84.31600
            Ω (Longitude of ascending node) : 347.19390
            ω (Argument of perihelion)      : 280.71980
            L (Longitude of perihelion)     : 319.57654
            B (Latitude of perihelion)      : -77.88209
            T (Time of perihelion passage)  : 2460264.14420
            P (Orbital period in years)     : 403092.27

            Epoch                           : 2025 Jul 12
            Reference                       : MPEC 2025-N64

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

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 (2.50 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 1.62 + 5 log[∆] + 10.00 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
2025-07-13 00:00 UT   01 30 13.9   -54 53 34    10.456   10.806  107.5    5.1   257   17.1 
2025-07-13 09:13 UT   01 30 10.6   -54 54 45    10.454   10.807  107.7    5.1   257   17.1 
2025-07-14 00:00 UT   01 30 05.2   -54 56 41    10.450   10.808  108.0    5.1   258   17.1 
2025-07-15 00:00 UT   01 29 55.9   -54 59 49    10.444   10.809  108.5    5.1   259   17.1 
2025-07-16 00:00 UT   01 29 45.9   -55 02 59    10.438   10.811  109.0    5.1   260   17.1 
2025-07-17 00:00 UT   01 29 35.3   -55 06 10    10.432   10.813  109.4    5.1   260   17.1 
2025-07-18 00:00 UT   01 29 24.1   -55 09 22    10.426   10.814  109.9    5.1   261   17.1 
2025-07-19 00:00 UT   01 29 12.2   -55 12 35    10.420   10.816  110.4    5.1   262   17.1 
2025-07-20 00:00 UT   01 28 59.6   -55 15 48    10.414   10.817  110.8    5.0   263   17.1 
2025-07-21 00:00 UT   01 28 46.4   -55 19 03    10.408   10.819  111.3    5.0   264   17.1 
2025-07-22 00:00 UT   01 28 32.4   -55 22 18    10.403   10.821  111.7    5.0   265   17.1 
2025-07-23 00:00 UT   01 28 17.9   -55 25 34    10.398   10.822  112.2    5.0   266   17.0 

    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.