C/2020 M5 (ATLAS)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	19 Aug 2021	15.0	3.002 AU	3.628 AU	12h29m	+43°16'	45.2°	13.8°	59°
Nearest approach	2 Mar 2022	15.0	3.559 AU	2.600 AU	12h02m	+10°25'	162.7°	4.8°	260°
Today	1 Aug 2026	24.7	13.941 AU	14.250 AU	08h19m	-51°55'	70.3°	3.9°	186°

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)                : 1.0000300
    q (Perihelion distance)         : 3.0024660
    i (Inclination)                 : 93.15190
    Ω (Longitude of ascending node) : 351.96530
    ω (Argument of perihelion)      : 126.26450
    L (Longitude of perihelion)     : 356.25149
    B (Latitude of perihelion)      : 53.61752
    T (Time of perihelion passage)  : 2459445.88760

    Epoch                           : 2026 Jul 31
    Reference                       : MPC194168

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-07-31 00:00 UT   08 19 22.5   -51 54 06    14.241   13.935   70.4    3.9   185   24.6 
2026-08-01 00:00 UT   08 19 44.4   -51 55 19    14.250   13.940   70.3    3.9   186   24.7 
2026-08-01 01:17 UT   08 19 45.6   -51 55 23    14.250   13.941   70.3    3.9   186   24.7 
2026-08-02 00:00 UT   08 20 06.3   -51 56 37    14.258   13.946   70.1    3.9   187   24.7 
2026-08-03 00:00 UT   08 20 28.1   -51 57 57    14.267   13.952   69.9    3.9   188   24.7 
2026-08-04 00:00 UT   08 20 49.8   -51 59 21    14.275   13.958   69.8    3.9   189   24.7 
2026-08-05 00:00 UT   08 21 11.5   -52 00 49    14.284   13.963   69.6    3.9   190   24.7 
2026-08-06 00:00 UT   08 21 33.2   -52 02 20    14.292   13.969   69.5    3.9   191   24.7 
2026-08-07 00:00 UT   08 21 54.7   -52 03 55    14.300   13.975   69.3    3.9   191   24.7 
2026-08-08 00:00 UT   08 22 16.2   -52 05 33    14.308   13.981   69.2    3.9   192   24.7 
2026-08-09 00:00 UT   08 22 37.5   -52 07 15    14.316   13.986   69.0    3.9   193   24.7 
2026-08-10 00:00 UT   08 22 58.8   -52 08 60    14.324   13.992   68.9    3.9   194   24.7 
2026-08-11 00:00 UT   08 23 20.0   -52 10 48    14.332   13.998   68.8    3.9   195   24.7 

    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.