C/2019 E3 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	15 Nov 2023	16.8	10.313 AU	10.373 AU	04h08m	-77°24'	83.8°	5.5°	349°
Nearest approach	25 Aug 2024	16.8	10.424 AU	10.069 AU	02h50m	-67°49'	107.9°	5.3°	286°
Today	17 May 2026	17.5	11.395 AU	11.640 AU	00h39m	-42°21'	73.6°	4.9°	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.)

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 1.6 + 5 log[∆] + 10.0 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/2019 E3 (ATLAS) are:

    e (Eccentricity)                : 0.9986540
    q (Perihelion distance)         : 10.3133720
    i (Inclination)                 : 84.33030
    Ω (Longitude of ascending node) : 347.17720
    ω (Argument of perihelion)      : 280.72750
    L (Longitude of perihelion)     : 319.63616
    B (Latitude of perihelion)      : -77.88191
    T (Time of perihelion passage)  : 2460264.40230
    P (Orbital period in years)     : 670707.92

    Epoch                           : 2026 May 16
    Reference                       : MPEC 2026-E43

    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
2026-05-16 00:00 UT   00 39 35.9   -42 21 45    11.650   11.392   72.8    4.9   222   17.5 
2026-05-17 00:00 UT   00 39 48.6   -42 21 34    11.641   11.395   73.4    4.9   223   17.5 
2026-05-17 04:05 UT   00 39 50.7   -42 21 32    11.640   11.395   73.6    4.9   223   17.5 
2026-05-18 00:00 UT   00 40 00.9   -42 21 26    11.632   11.397   74.1    4.9   223   17.5 
2026-05-19 00:00 UT   00 40 13.0   -42 21 22    11.623   11.399   74.8    4.9   224   17.5 
2026-05-20 00:00 UT   00 40 24.8   -42 21 21    11.613   11.401   75.4    4.9   225   17.5 
2026-05-21 00:00 UT   00 40 36.3   -42 21 24    11.604   11.404   76.1    4.9   225   17.5 
2026-05-22 00:00 UT   00 40 47.5   -42 21 30    11.594   11.406   76.8    5.0   226   17.5 
2026-05-23 00:00 UT   00 40 58.4   -42 21 40    11.585   11.408   77.5    5.0   227   17.5 
2026-05-24 00:00 UT   00 41 08.9   -42 21 53    11.575   11.410   78.1    5.0   227   17.5 
2026-05-25 00:00 UT   00 41 19.2   -42 22 09    11.565   11.412   78.8    5.0   228   17.5 
2026-05-26 00:00 UT   00 41 29.1   -42 22 29    11.555   11.415   79.5    5.0   228   17.5 
2026-05-27 00:00 UT   00 41 38.7   -42 22 52    11.546   11.417   80.2    5.0   229   17.5 

    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.