C/2019 M3 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	16 Dec 2018	13.8	2.430 AU	2.434 AU	17h23m	+54°47'	78.1°	23.3°	357°
Perihelion	31 Dec 2018	13.8	2.425 AU	2.469 AU	18h38m	+52°47'	75.9°	23.2°	359°
Today	25 Apr 2024	25.7	15.072 AU	15.378 AU	23h29m	-46°32'	70.4°	3.6°	223°

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 M3 (ATLAS) are:

            e (Eccentricity)                : 0.9994970
            q (Perihelion distance)         : 2.4246200
            i (Inclination)                 : 99.57140
            Ω (Longitude of ascending node) : 154.97700
            ω (Argument of perihelion)      : 87.92020
            L (Longitude of perihelion)     : 77.29712
            B (Latitude of perihelion)      : 80.20730
            T (Time of perihelion passage)  : 2458483.88470
            P (Orbital period in years)     : 334667.51

            Epoch                           : 2024 Apr 25
            Reference                       : MPC118095

            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 (12.20 + 5 log[∆] + 10.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 7.97 + 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
2024-04-25 00:00 UT   23 29 17.6   -46 30 52    15.384   15.066   69.8    3.6   222   25.7 
2024-04-25 21:43 UT   23 29 31.9   -46 32 17    15.378   15.072   70.4    3.6   223   25.7 
2024-04-26 00:00 UT   23 29 33.4   -46 32 26    15.378   15.072   70.5    3.6   223   25.7 
2024-04-27 00:00 UT   23 29 49.0   -46 34 02    15.371   15.078   71.2    3.6   223   25.7 
2024-04-28 00:00 UT   23 30 04.3   -46 35 41    15.365   15.084   71.9    3.6   224   25.7 
2024-04-29 00:00 UT   23 30 19.5   -46 37 22    15.358   15.089   72.7    3.7   225   25.7 
2024-04-30 00:00 UT   23 30 34.4   -46 39 06    15.352   15.095   73.4    3.7   225   25.7 
2024-05-01 00:00 UT   23 30 49.1   -46 40 53    15.345   15.101   74.1    3.7   226   25.7 
2024-05-02 00:00 UT   23 31 03.6   -46 42 42    15.339   15.107   74.8    3.7   227   25.7 
2024-05-03 00:00 UT   23 31 17.8   -46 44 34    15.332   15.112   75.5    3.7   227   25.7 
2024-05-04 00:00 UT   23 31 31.8   -46 46 29    15.325   15.118   76.3    3.7   228   25.7 
2024-05-05 00:00 UT   23 31 45.6   -46 48 26    15.318   15.124   77.0    3.7   228   25.7 

    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.