C/2020 F5 (MASTER)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	15 Mar 2021	15.2	4.321 AU	4.992 AU	22h37m	-42°45'	43.2°	9.1°	204°
Nearest approach	22 Aug 2021	14.7	4.511 AU	3.583 AU	23h14m	-32°47'	153.6°	5.7°	318°
Today	11 Sep 2026	22.4	14.186 AU	13.804 AU	01h21m	+60°59'	110.4°	3.8°	213°

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 5.7 + 5 log[∆] + 9.6 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 F5 (MASTER) are:

    e (Eccentricity)                : 0.9730510
    q (Perihelion distance)         : 4.3211930
    i (Inclination)                 : 52.25190
    Ω (Longitude of ascending node) : 350.58640
    ω (Argument of perihelion)      : 310.51650
    L (Longitude of perihelion)     : 314.96988
    B (Latitude of perihelion)      : -36.94962
    T (Time of perihelion passage)  : 2459289.16960
    P (Orbital period in years)     : 2030.45

    Epoch                           : 2026 Sep 11
    Reference                       : MPC194166

    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
2026-09-10 00:00 UT   01 22 42.1   +60 55 36    13.812   14.176  109.2    3.8   215   22.4 
2026-09-11 00:00 UT   01 22 18.6   +60 57 22    13.808   14.181  109.8    3.8   214   22.4 
2026-09-11 23:27 UT   01 21 55.2   +60 59 01    13.804   14.186  110.4    3.8   213   22.4 
2026-09-12 00:00 UT   01 21 54.6   +60 59 03    13.803   14.187  110.4    3.8   213   22.4 
2026-09-13 00:00 UT   01 21 30.3   +61 00 42    13.799   14.192  111.0    3.8   212   22.4 
2026-09-14 00:00 UT   01 21 05.7   +61 02 16    13.795   14.197  111.6    3.8   211   22.4 
2026-09-15 00:00 UT   01 20 40.7   +61 03 47    13.791   14.202  112.2    3.8   210   22.4 
2026-09-16 00:00 UT   01 20 15.3   +61 05 13    13.787   14.207  112.8    3.7   209   22.4 
2026-09-17 00:00 UT   01 19 49.7   +61 06 37    13.783   14.213  113.4    3.7   208   22.4 
2026-09-18 00:00 UT   01 19 23.7   +61 07 56    13.779   14.218  114.0    3.7   207   22.4 
2026-09-19 00:00 UT   01 18 57.4   +61 09 11    13.776   14.223  114.6    3.7   206   22.4 
2026-09-20 00:00 UT   01 18 30.9   +61 10 23    13.772   14.228  115.1    3.7   205   22.4 
2026-09-21 00:00 UT   01 18 04.0   +61 11 31    13.769   14.234  115.7    3.6   204   22.4 

    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.