C/2019 F2 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	14 Feb 2019	17.5	3.082 AU	2.248 AU	07h22m	+00°13'	141.3°	11.5°	69°
Perihelion	8 Sep 2019	16.9	2.237 AU	3.195 AU	12h03m	+02°34'	15.0°	6.7°	103°
Today	15 Jan 2026	28.6	14.854 AU	15.626 AU	22h06m	-04°22'	37.2°	2.3°	60°

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 10.9 + 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 F2 (ATLAS) are:

    e (Eccentricity)                : 0.8648840
    q (Perihelion distance)         : 2.2367420
    i (Inclination)                 : 19.34590
    Ω (Longitude of ascending node) : 175.33190
    ω (Argument of perihelion)      : 11.60330
    L (Longitude of perihelion)     : 186.29636
    B (Latitude of perihelion)      : 3.82044
    T (Time of perihelion passage)  : 2458734.62140
    P (Orbital period in years)     : 67.35

    Epoch                           : 2025 Nov 12
    Reference                       : MPC188408

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-01-14 00:00 UT   22 05 56.9   -04 24 01    15.597   14.846   39.0    2.4    61   28.6 
2026-01-15 00:00 UT   22 06 10.9   -04 23 11    15.612   14.850   38.0    2.3    61   28.6 
2026-01-15 22:31 UT   22 06 24.1   -04 22 22    15.626   14.854   37.2    2.3    60   28.6 
2026-01-16 00:00 UT   22 06 25.0   -04 22 19    15.626   14.854   37.1    2.3    60   28.6 
2026-01-17 00:00 UT   22 06 39.2   -04 21 26    15.641   14.858   36.2    2.2    60   28.6 
2026-01-18 00:00 UT   22 06 53.5   -04 20 32    15.655   14.862   35.2    2.2    60   28.6 
2026-01-19 00:00 UT   22 07 08.0   -04 19 36    15.668   14.866   34.3    2.1    59   28.6 
2026-01-20 00:00 UT   22 07 22.5   -04 18 40    15.682   14.870   33.4    2.1    59   28.6 
2026-01-21 00:00 UT   22 07 37.2   -04 17 43    15.695   14.874   32.4    2.0    59   28.6 
2026-01-22 00:00 UT   22 07 51.9   -04 16 44    15.708   14.878   31.5    2.0    58   28.6 
2026-01-23 00:00 UT   22 08 06.8   -04 15 45    15.721   14.882   30.6    1.9    58   28.6 
2026-01-24 00:00 UT   22 08 21.7   -04 14 44    15.734   14.886   29.6    1.9    57   28.6 
2026-01-25 00:00 UT   22 08 36.7   -04 13 43    15.746   14.890   28.7    1.8    57   28.6 

    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.