A/2019 G4
ephemeris	date	magn	radius	delta	ra	dec	elong	phase	PA
Perihelion	8 Nov 2018	21.4	5.937 AU	6.617 AU	11h59m	-36°34'	43.5°	6.6°	255°
Nearest approach	16 Mar 2019	20.8	6.001 AU	5.192 AU	10h39m	-33°51'	141.3°	5.9°	27°
Today	16 Sep 2019	21.5	6.303 AU	7.214 AU	10h24m	-12°34'	23.2°	3.6°	230°

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 G4, as provided by the minor planet center, are:

            e (eccentricity)                : 0.9340470
            q (perihelion distance)         : 5.93743
            i (inclination)                 : 138.12420
            Ω (Longitude of ascending node) : 130.99050
            ω (Argument of perihelion)      : 293.86940
            L (Longitude of perihelion)     : 190.26815
            B (Latitude of perihelion)      : -37.62027
            T (Time of perihelion passage)  : 2458431.36920
            P (Orbital period in years)     : 854.17

            Family/Group:                   : Nearly isotropic
        

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 indicates the expected brightness if this object is a comet (13.00 + 5 log[∆] + 5.00 log[r]), whereas the red curve indicates the expected lightcurve for an asteroid (H=12.90; G=.15).

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 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.

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