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	9 Nov 2026	28.1	14.020 AU	14.668 AU	14h11m	+29°22'	47.6°	3.0°	345°

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
2026-11-08 00:00 UT   14 10 47.1   +29 22 42    14.669   14.009   46.8    3.0   347   28.1 
2026-11-09 00:00 UT   14 11 03.9   +29 22 47    14.668   14.016   47.3    3.0   346   28.1 
2026-11-09 15:29 UT   14 11 14.7   +29 22 51    14.668   14.020   47.6    3.0   345   28.1 
2026-11-10 00:00 UT   14 11 20.6   +29 22 55    14.668   14.022   47.8    3.0   345   28.1 
2026-11-11 00:00 UT   14 11 37.3   +29 23 05    14.667   14.028   48.3    3.0   343   28.1 
2026-11-12 00:00 UT   14 11 53.9   +29 23 19    14.666   14.034   48.8    3.0   342   28.1 
2026-11-13 00:00 UT   14 12 10.4   +29 23 36    14.665   14.040   49.3    3.1   341   28.1 
2026-11-14 00:00 UT   14 12 26.8   +29 23 56    14.664   14.047   49.8    3.1   340   28.1 
2026-11-15 00:00 UT   14 12 43.2   +29 24 18    14.663   14.053   50.4    3.1   339   28.1 
2026-11-16 00:00 UT   14 12 59.5   +29 24 44    14.661   14.059   50.9    3.1   338   28.1 
2026-11-17 00:00 UT   14 13 15.7   +29 25 12    14.659   14.065   51.5    3.2   337   28.1 
2026-11-18 00:00 UT   14 13 31.8   +29 25 44    14.657   14.071   52.0    3.2   336   28.1 
2026-11-19 00:00 UT   14 13 47.8   +29 26 18    14.655   14.078   52.6    3.2   335   28.1 

    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.