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°06'	56.5°	42.9°	203°
Nearest approach	7 Jul 2022	17.4	1.317 AU	1.138 AU	07h11m	-52°28'	75.1°	48.2°	178°
Today	27 Mar 2026	27.4	12.571 AU	11.842 AU	14h19m	+32°37'	135.3°	3.2°	224°

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)                : 1.0005000
    q (Perihelion distance)         : 1.2423040
    i (Inclination)                 : 117.48030
    Ω (Longitude of ascending node) : 223.17120
    ω (Argument of perihelion)      : 263.47870
    L (Longitude of perihelion)     : 147.08482
    B (Latitude of perihelion)      : -61.81526
    T (Time of perihelion passage)  : 2459738.96870

    Epoch                           : 2026 Mar 16
    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
2026-03-26 00:00 UT   14 20 03.8   +32 33 34    11.839   12.565  135.0    3.2   226   27.4 
2026-03-27 00:00 UT   14 19 44.1   +32 37 01    11.842   12.571  135.3    3.2   224   27.4 
2026-03-27 00:15 UT   14 19 43.9   +32 37 03    11.842   12.571  135.3    3.2   224   27.4 
2026-03-28 00:00 UT   14 19 24.1   +32 40 25    11.846   12.578  135.5    3.2   223   27.4 
2026-03-29 00:00 UT   14 19 03.9   +32 43 46    11.850   12.584  135.7    3.2   221   27.4 
2026-03-30 00:00 UT   14 18 43.6   +32 47 05    11.855   12.591  135.9    3.2   220   27.4 
2026-03-31 00:00 UT   14 18 23.0   +32 50 20    11.859   12.597  136.0    3.2   218   27.4 
2026-04-01 00:00 UT   14 18 02.3   +32 53 31    11.864   12.604  136.2    3.1   217   27.4 
2026-04-02 00:00 UT   14 17 41.4   +32 56 40    11.869   12.610  136.3    3.1   215   27.4 
2026-04-03 00:00 UT   14 17 20.3   +32 59 45    11.874   12.617  136.4    3.1   213   27.4 
2026-04-04 00:00 UT   14 16 59.0   +33 02 47    11.880   12.623  136.4    3.1   212   27.4 
2026-04-05 00:00 UT   14 16 37.7   +33 05 46    11.885   12.630  136.5    3.1   210   27.4 
2026-04-06 00:00 UT   14 16 16.1   +33 08 41    11.891   12.636  136.5    3.1   209   27.4 

    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.