C/2020 M5 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	19 Aug 2021	15.0	3.001 AU	3.627 AU	12h29m	+43°15'	45.2°	13.8°	59°
Nearest approach	2 Mar 2022	15.0	3.558 AU	2.599 AU	12h02m	+10°26'	162.6°	4.8°	260°
Today	22 Apr 2026	24.3	13.355 AU	13.157 AU	07h54m	-54°38'	99.2°	4.3°	98°

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 7.4 + 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 M5 (ATLAS) are:

    e (Eccentricity)                : 1.0000430
    q (Perihelion distance)         : 3.0013050
    i (Inclination)                 : 93.15610
    Ω (Longitude of ascending node) : 351.97710
    ω (Argument of perihelion)      : 126.25410
    L (Longitude of perihelion)     : 356.27060
    B (Latitude of perihelion)      : 53.62756
    T (Time of perihelion passage)  : 2459446.02070

    Epoch                           : 2026 Apr 21
    Reference                       : MPEC 2026-E44

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-04-21 00:00 UT   07 54 35.1   -54 44 08    13.142   13.347   99.6    4.3    97   24.3 
2026-04-22 00:00 UT   07 54 33.0   -54 40 17    13.152   13.353   99.3    4.3    98   24.3 
2026-04-22 10:47 UT   07 54 32.2   -54 38 33    13.157   13.355   99.2    4.3    98   24.3 
2026-04-23 00:00 UT   07 54 31.4   -54 36 27    13.163   13.359   99.1    4.3    99   24.3 
2026-04-24 00:00 UT   07 54 30.3   -54 32 38    13.173   13.365   98.8    4.3   100   24.3 
2026-04-25 00:00 UT   07 54 29.8   -54 28 51    13.184   13.370   98.5    4.3   100   24.3 
2026-04-26 00:00 UT   07 54 29.8   -54 25 04    13.195   13.376   98.2    4.3   101   24.3 
2026-04-27 00:00 UT   07 54 30.2   -54 21 19    13.206   13.382   97.9    4.3   102   24.3 
2026-04-28 00:00 UT   07 54 31.2   -54 17 35    13.216   13.388   97.6    4.3   103   24.3 
2026-04-29 00:00 UT   07 54 32.7   -54 13 53    13.227   13.394   97.3    4.3   104   24.3 
2026-04-30 00:00 UT   07 54 34.6   -54 10 12    13.238   13.400   97.1    4.3   105   24.3 
2026-05-01 00:00 UT   07 54 37.0   -54 06 33    13.249   13.406   96.8    4.3   106   24.3 
2026-05-02 00:00 UT   07 54 39.9   -54 02 55    13.260   13.411   96.5    4.3   107   24.3 

    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.