Skip Navigation Links

C/2021 S4 (Tsuchinshan)
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach8 Dec 202317.66.696 AU5.759 AU 04h46m+41°48'160.7°2.8°172°
Perihelion3 Jan 202417.66.694 AU5.861 AU 04h35m+41°24'145.5°4.8°112°
Today11 Feb 202619.08.296 AU7.359 AU 09h15m+32°39'160.4°2.3°161°
C/2021 S4 (Tsuchinshan)- 2026-02-11
astro.vanbuitenen.nl


 
-1 month
-1 week
-1 day
Now
+1 day
+1 week
+1 month

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 5.5 + 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/2021 S4 (Tsuchinshan) are: 

    e (Eccentricity)                : 0.9561130
    q (Perihelion distance)         : 6.6942240
    i (Inclination)                 : 17.48230
    Ω (Longitude of ascending node) : 5.43590
    ω (Argument of perihelion)      : 73.09450
    L (Longitude of perihelion)     : 77.76161
    B (Latitude of perihelion)      : 16.70410
    T (Time of perihelion passage)  : 2460313.47200
    P (Orbital period in years)     : 1883.85

    Epoch                           : 2026 Feb 11
    Reference                       : MPC184409

    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
2026-02-10 00:00 UT   09 15 47.1   +32 38 52     7.348    8.289  161.5    2.2   167   19.0 
2026-02-11 00:00 UT   09 15 25.1   +32 39 18     7.354    8.293  160.9    2.2   164   19.0 
2026-02-11 21:00 UT   09 15 05.8   +32 39 38     7.359    8.296  160.4    2.3   161   19.0 
2026-02-12 00:00 UT   09 15 03.1   +32 39 41     7.360    8.296  160.3    2.3   161   19.0 
2026-02-13 00:00 UT   09 14 41.2   +32 40 01     7.367    8.300  159.7    2.4   158   19.0 
2026-02-14 00:00 UT   09 14 19.5   +32 40 17     7.374    8.304  159.0    2.4   156   19.1 
2026-02-15 00:00 UT   09 13 57.8   +32 40 31     7.381    8.307  158.3    2.5   154   19.1 
2026-02-16 00:00 UT   09 13 36.4   +32 40 42     7.389    8.311  157.6    2.6   151   19.1 
2026-02-17 00:00 UT   09 13 15.1   +32 40 50     7.397    8.315  156.8    2.7   149   19.1 
2026-02-18 00:00 UT   09 12 54.0   +32 40 54     7.405    8.318  156.0    2.8   148   19.1 
2026-02-19 00:00 UT   09 12 33.0   +32 40 56     7.414    8.322  155.2    2.9   146   19.1 
2026-02-20 00:00 UT   09 12 12.3   +32 40 54     7.423    8.326  154.4    2.9   144   19.1 
2026-02-21 00:00 UT   09 11 51.8   +32 40 49     7.432    8.329  153.6    3.0   142   19.1 




    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.

Privacy policy