A/2019 O4
ephemeris date magn radius delta ra dec elong phase PA
Nearest approach5 Sep 201921.13.879 AU3.039 AU21h40m+27°06'141.5°9.3°149°
Perihelion9 Feb 202021.73.645 AU4.310 AU20h28m+24°57'42.5°10.5°337°
Today9 Aug 202021.93.952 AU3.891 AU16h05m+48°06'86.0°14.8°109°
A/2019 O4- 2020-08-09

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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 A/2019 O4, as provided by the minor planet center, are:

            e (eccentricity)                : 0.8890670
            q (perihelion distance)         : 3.6445640
            i (inclination)                 : 115.08560
            Ω (Longitude of ascending node) : 354.91990
            ω (Argument of perihelion)      : 61.81900
            L (Longitude of perihelion)     : 316.56413
            B (Latitude of perihelion)      : 52.96966
            T (Time of perihelion passage)  : 2458889.48730
            P (Orbital period in years)     : 188.31
            Epoch                           : 2020 Aug 08

            Family/Group:                   : Nearly isotropic
            Tisserand (Jupiter)             : -0.817

The light curve 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. The gray curve indicates the expected brightness if this object is a comet (15.50 + 5 log[∆] + 5.00 log[r]), whereas the red curve indicates the expected lightcurve for an asteroid (H=15.10; G=.15).

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.
A more printer-friendly version of the same chart can be found further down this page as well.