C/2019 T3 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	4 Mar 2021	16.6	5.953 AU	6.550 AU	22h49m	+43°00'	49.5°	7.3°	357°
Nearest approach	11 Sep 2021	16.3	6.102 AU	5.375 AU	22h02m	+39°30'	132.7°	7.0°	155°
Today	27 Jul 2024	19.7	10.157 AU	9.173 AU	21h20m	-27°59'	164.9°	1.5°	303°

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 T3 (ATLAS) are:

            e (Eccentricity)                : 0.9982960
            q (Perihelion distance)         : 5.9531270
            i (Inclination)                 : 121.85060
            Ω (Longitude of ascending node) : 139.53460
            ω (Argument of perihelion)      : 112.46880
            L (Longitude of perihelion)     : 191.44797
            B (Latitude of perihelion)      : 51.71560
            T (Time of perihelion passage)  : 2459277.86910
            P (Orbital period in years)     : 206496.80

            Epoch                           : 2024 Jul 26
            Reference                       : MPEC 2023-UR6

            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 (6.80 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 4.81 + 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
2024-07-27 00:00 UT   21 20 20.4   -27 58 14     9.172   10.156  164.8    1.5   302   19.7 
2024-07-27 06:30 UT   21 20 12.5   -27 59 23     9.173   10.157  164.9    1.5   303   19.7 
2024-07-28 00:00 UT   21 19 51.1   -28 02 29     9.175   10.161  165.4    1.4   306   19.7 
2024-07-29 00:00 UT   21 19 21.6   -28 06 42     9.177   10.166  166.0    1.4   309   19.7 
2024-07-30 00:00 UT   21 18 52.1   -28 10 53     9.180   10.171  166.5    1.3   313   19.7 
2024-07-31 00:00 UT   21 18 22.4   -28 15 03     9.184   10.175  166.9    1.3   318   19.7 
2024-08-01 00:00 UT   21 17 52.7   -28 19 11     9.188   10.180  167.3    1.3   322   19.7 
2024-08-02 00:00 UT   21 17 22.8   -28 23 17     9.192   10.185  167.6    1.2   327   19.7 
2024-08-03 00:00 UT   21 16 52.9   -28 27 21     9.196   10.190  167.8    1.2   332   19.7 
2024-08-04 00:00 UT   21 16 22.9   -28 31 24     9.201   10.195  167.9    1.2   337   19.7 
2024-08-05 00:00 UT   21 15 52.9   -28 35 25     9.206   10.200  167.9    1.2   343   19.7 
2024-08-06 00:00 UT   21 15 22.9   -28 39 24     9.211   10.205  167.8    1.2   348   19.7 

    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.