123P/West-Hartley
ephemeris date magn radius delta ra dec elong phase PA
Today14 Dec 201814.92.167 AU1.696 AU11h04m+27°20'104.8°26.1°289°
Perihelion5 Feb 201914.02.127 AU1.253 AU11h40m+30°39'143.4°16.1°255°
Nearest approach28 Feb 201914.02.135 AU1.200 AU11h27m+31°57'154.0°11.7°207°
123P/West-Hartley - 2018-12-14
astro.vanbuitenen.nl


 
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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.)

The orbital elements of 123P/West-Hartley, as provided by the minor planet center, are:

            e (eccentricity)                : 0.4486880
            q (perihelion distance)         : 2.12689
            i (inclination)                 : 15.35960
            Ω (Longitude of ascending node) : 46.49960
            ω (Argument of perihelion)      : 103.00590
            L (Longitude of perihelion)     : -30.03001
            B (Latitude of perihelion)      : 14.95625
            T (Time of perihelion passage)  : 2458519.60190
            P (Orbital period in years)     : 7.58

            Family/Group:                   : Jupiter family
        

The lightcurve chart below shows the estimated development of the comet's magnitude. Blue and black dots are visual and photometric CCD observations respectively from COBS or the MPC Two lightcurves are shown: The gray curve is based on the absolute magnitide and slope parameter as provided by the minor planet center (4.00 + 5 log[∆] + 25.00 log[r]), whereas the red curve is being recalculated every 6 hours based on the available COBS/MPC observations (currently 5.35 + 5 log[∆] + 25.00 log[r]).


The all-sky chart below shows the path of of the comet over the same period as the lightcurve. The comet's current position is marked yellow.





The following chart show the short-term path of the comet in a field of view that is optimized for (~10x50) binoculars and finderscopes.
A more printer-friendly versions of the same chart can be found further down this page as well.


The following chart show the current location of the comet in a smaller, upside-down telescopic field of view.