C/2020 F2 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Nearest approach	19 Apr 2022	18.0	8.827 AU	7.845 AU	14h00m	+01°17'	167.2°	1.4°	193°
Perihelion	12 Jul 2022	18.2	8.814 AU	8.806 AU	13h19m	+04°45'	87.1°	6.6°	112°
Today	20 Dec 2025	19.8	11.328 AU	10.848 AU	10h33m	+26°58'	117.0°	4.4°	284°

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 4.1 + 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/2020 F2 (ATLAS) are:

    e (Eccentricity)                : 1.0018230
    q (Perihelion distance)         : 8.8137760
    i (Inclination)                 : 163.58990
    Ω (Longitude of ascending node) : 250.29620
    ω (Argument of perihelion)      : 48.22470
    L (Longitude of perihelion)     : 203.25782
    B (Latitude of perihelion)      : 12.16256
    T (Time of perihelion passage)  : 2459772.58360

    Epoch                           : 2025 Dec 19
    Reference                       : MPEC 2025-X35

    Classification(s):              : Nearly isotropic; New (a > 10000 AU)

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-19 00:00 UT   10 34 00.8   +26 54 54    10.861   11.324  115.8    4.5   284   19.8 
2025-12-20 00:00 UT   10 33 43.6   +26 57 53    10.849   11.328  116.8    4.4   284   19.8 
2025-12-20 02:54 UT   10 33 41.5   +26 58 15    10.848   11.328  117.0    4.4   284   19.8 
2025-12-21 00:00 UT   10 33 26.1   +27 00 54    10.837   11.331  117.9    4.4   284   19.8 
2025-12-22 00:00 UT   10 33 08.1   +27 03 57    10.826   11.335  118.9    4.4   283   19.8 
2025-12-23 00:00 UT   10 32 49.6   +27 07 01    10.814   11.338  120.0    4.3   283   19.8 
2025-12-24 00:00 UT   10 32 30.8   +27 10 06    10.803   11.341  121.0    4.3   282   19.8 
2025-12-25 00:00 UT   10 32 11.5   +27 13 12    10.792   11.345  122.0    4.2   282   19.8 
2025-12-26 00:00 UT   10 31 51.8   +27 16 20    10.781   11.348  123.1    4.2   281   19.8 
2025-12-27 00:00 UT   10 31 31.7   +27 19 29    10.771   11.352  124.1    4.1   281   19.8 
2025-12-28 00:00 UT   10 31 11.1   +27 22 39    10.760   11.355  125.2    4.1   280   19.8 
2025-12-29 00:00 UT   10 30 50.2   +27 25 50    10.750   11.358  126.2    4.0   280   19.8 
2025-12-30 00:00 UT   10 30 28.8   +27 29 02    10.740   11.362  127.2    4.0   279   19.8 

    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.