66P/duToit
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	11 May 2018	11.3	1.306 AU	1.022 AU	22h53m	-32°37'	79.9°	49.6°	241°
Nearest approach	15 Aug 2018	15.0	1.793 AU	1.012 AU	01h26m	-11°25'	124.7°	27.7°	261°
Today	13 Oct 2025	41.2	10.835 AU	10.686 AU	07h09m	+41°01'	95.9°	5.3°	275°

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 8.1 + 5 log[∆] + 27.0 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 66P/duToit are:

    e (Eccentricity)                : 0.7849250
    q (Perihelion distance)         : 1.3056090
    i (Inclination)                 : 18.64590
    Ω (Longitude of ascending node) : 21.84780
    ω (Argument of perihelion)      : 257.36160
    L (Longitude of perihelion)     : 98.53361
    B (Latitude of perihelion)      : -18.17810
    T (Time of perihelion passage)  : 2458250.12550
    P (Orbital period in years)     : 14.96

    Epoch                           : 2025 Oct 12
    Reference                       : MPEC 2021-F20

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

Ephemerides

Date       Time       RA (2000)    DEC (2000)    delta   radius  elong  phase   PA    magn
2025-10-13 00:00 UT   07 09 47.8   +41 00 49    10.694   10.835   95.5    5.3   275   41.2 
2025-10-13 11:54 UT   07 09 48.7   +41 01 41    10.686   10.835   95.9    5.3   275   41.2 
2025-10-14 00:00 UT   07 09 49.4   +41 02 34    10.678   10.835   96.4    5.2   275   41.2 
2025-10-15 00:00 UT   07 09 50.5   +41 04 20    10.662   10.835   97.3    5.2   275   41.2 
2025-10-16 00:00 UT   07 09 51.1   +41 06 06    10.647   10.835   98.3    5.2   274   41.2 
2025-10-17 00:00 UT   07 09 51.2   +41 07 54    10.631   10.835   99.2    5.2   274   41.2 
2025-10-18 00:00 UT   07 09 50.8   +41 09 42    10.615   10.835  100.2    5.2   274   41.2 
2025-10-19 00:00 UT   07 09 49.9   +41 11 31    10.599   10.835  101.1    5.2   273   41.2 
2025-10-20 00:00 UT   07 09 48.5   +41 13 20    10.583   10.835  102.1    5.2   273   41.2 
2025-10-21 00:00 UT   07 09 46.6   +41 15 10    10.568   10.835  103.0    5.1   273   41.2 
2025-10-22 00:00 UT   07 09 44.2   +41 17 01    10.552   10.835  103.9    5.1   272   41.2 
2025-10-23 00:00 UT   07 09 41.2   +41 18 52    10.537   10.835  104.9    5.1   272   41.2 

    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.