Open Access

Fig. A.1

image

Download original image

Coma morphology of T2 in its inbound (Panels a to h) and outbound (Panel i) orbit taken from the ZTF archive. All panels cover a FoV of 4′ × 4′ and provide a close-up image on the bottom right with FoV of 1′. The negative velocity vector (−v), solar radius vector (r), and 1′ scale bar are given in each panel. A zoom-in image was processed by the boxcar smoothing with a width of 3 pixels to better visualize coma features. Five contour levels stratify the brightness within 2-σ of the peak brightness on a logarithmic scale, except for the image in panel a, where we could not make aperture photometry due to its weak contrast to the background signal. The heliocentric distance for the comet in each panel is (a) 3.004 au (inbound), (b) 2.624 au (inbound), (c) 2.422 au (inbound), (d) 2.329 au (inbound), (e) 2.267 au (inbound), (f) 2.129 au (inbound), (g) 2.068 au (inbound), (h) 2.055 au (inbound, two days before perihelion), and (i) 2.075 au (outbound). North is up and east is to the left.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.