66P/duToit
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Today	29 Dec 2025	40.8	10.832 AU	9.903 AU	06h48m	+43°03'	159.9°	1.8°	189°
Perihelion	24 Apr 2033	11.8	1.306 AU	1.272 AU	22h26m	-29°54'	68.8°	45.9°	240°
Nearest approach	26 Aug 2033	16.8	2.029 AU	1.217 AU	01h36m	-03°08'	131.0°	22.1°	259°

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 8.2 + 5 log[∆] + 26.7 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 66P/duToit are:

    e (Eccentricity)                : 0.7849290
    q (Perihelion distance)         : 1.3055860
    i (Inclination)                 : 18.64640
    Ω (Longitude of ascending node) : 21.85520
    ω (Argument of perihelion)      : 257.34570
    L (Longitude of perihelion)     : 98.52428
    B (Latitude of perihelion)      : -18.17742
    T (Time of perihelion passage)  : 2463712.47020
    P (Orbital period in years)     : 14.96

    Epoch                           : 2025 Dec 29
    Reference                       : MPEC 2025-W75

    Classification(s):              : Ecliptic; Jupiter family
    Tisserand (Jupiter)             : 2.125

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-12-28 00:00 UT   06 49 36.4   +43 01 58     9.904   10.832  159.7    1.8   195   40.8 
2025-12-29 00:00 UT   06 49 08.0   +43 02 36     9.904   10.832  159.9    1.8   192   40.8 
2025-12-29 21:35 UT   06 48 42.5   +43 03 08     9.903   10.832  159.9    1.8   189   40.8 
2025-12-30 00:00 UT   06 48 39.6   +43 03 11     9.903   10.832  159.9    1.8   189   40.8 
2025-12-31 00:00 UT   06 48 11.1   +43 03 44     9.903   10.832  160.0    1.8   186   40.8 
2026-01-01 00:00 UT   06 47 42.6   +43 04 14     9.903   10.832  160.0    1.8   182   40.8 
2026-01-02 00:00 UT   06 47 14.1   +43 04 41     9.903   10.832  159.9    1.8   179   40.8 
2026-01-03 00:00 UT   06 46 45.6   +43 05 06     9.904   10.832  159.7    1.8   176   40.8 
2026-01-04 00:00 UT   06 46 17.1   +43 05 29     9.905   10.831  159.5    1.8   172   40.8 
2026-01-05 00:00 UT   06 45 48.6   +43 05 48     9.906   10.831  159.3    1.8   169   40.8 
2026-01-06 00:00 UT   06 45 20.2   +43 06 05     9.907   10.831  159.0    1.9   166   40.8 
2026-01-07 00:00 UT   06 44 51.8   +43 06 19     9.909   10.831  158.6    1.9   163   40.8 
2026-01-08 00:00 UT   06 44 23.5   +43 06 31     9.911   10.831  158.2    1.9   160   40.8 

    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.