C/2021 T2 (Fuls)
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	8 Jun 2022	17.8	1.242 AU	1.470 AU	03h43m	-30°05'	56.5°	42.9°	203°
Nearest approach	7 Jul 2022	17.4	1.317 AU	1.138 AU	07h11m	-52°26'	75.1°	48.3°	178°
Today	19 Jul 2026	27.8	13.308 AU	13.481 AU	13h49m	+32°42'	78.0°	4.3°	107°

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. The light curve is estimated manually by the author. (16.5 + 5 log[∆] + 5.0 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/2021 T2 (Fuls) are:

    e (Eccentricity)                : 1.0004810
    q (Perihelion distance)         : 1.2418500
    i (Inclination)                 : 117.46860
    Ω (Longitude of ascending node) : 223.15710
    ω (Argument of perihelion)      : 263.46370
    L (Longitude of perihelion)     : 147.10701
    B (Latitude of perihelion)      : -61.82341
    T (Time of perihelion passage)  : 2459738.97870

    Epoch                           : 2026 May 29
    Reference                       : MPC194177

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2026-07-18 00:00 UT   13 49 17.4   +32 45 37    13.455   13.299   79.0    4.3   108   27.8 
2026-07-19 00:00 UT   13 49 16.1   +32 43 09    13.473   13.305   78.3    4.3   108   27.8 
2026-07-19 10:01 UT   13 49 15.7   +32 42 08    13.481   13.308   78.0    4.3   107   27.8 
2026-07-20 00:00 UT   13 49 15.2   +32 40 41    13.492   13.312   77.6    4.3   107   27.8 
2026-07-21 00:00 UT   13 49 14.6   +32 38 12    13.511   13.318   76.9    4.3   106   27.8 
2026-07-22 00:00 UT   13 49 14.3   +32 35 42    13.530   13.324   76.2    4.2   106   27.8 
2026-07-23 00:00 UT   13 49 14.4   +32 33 11    13.548   13.331   75.5    4.2   105   27.8 
2026-07-24 00:00 UT   13 49 14.8   +32 30 40    13.567   13.337   74.8    4.2   104   27.8 
2026-07-25 00:00 UT   13 49 15.5   +32 28 08    13.585   13.344   74.1    4.2   104   27.8 
2026-07-26 00:00 UT   13 49 16.5   +32 25 35    13.604   13.350   73.4    4.2   103   27.8 
2026-07-27 00:00 UT   13 49 17.8   +32 23 02    13.622   13.356   72.7    4.2   102   27.8 
2026-07-28 00:00 UT   13 49 19.4   +32 20 29    13.640   13.363   72.0    4.1   102   27.8 
2026-07-29 00:00 UT   13 49 21.4   +32 17 55    13.658   13.369   71.4    4.1   101   27.8 

    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.