60p 20190210 ztf

ZTF archive images of comet 60P/Tsuchinshan from Feb. 10, 2019 in g and r filters made using a 1.22-m Samuel Oschin Telescope.
Brighness was measured by means of a differential photometry technique in both r and g-band. Reference APASS star catalog and a 9" aperture radius of the Aperture Photometry Tool were used for comet brightness estimation.
In g-filter coma looked a bit larger to me. Comet shows long tail (appr. 18' long) and coma, 0.8' in diameter.

Comet 60P/Tsuchinshan
2019 Feb. 10.42 UT m(g) =15.58 ± 0.02 Dia.=0.8' Tail=&18' in PA 298 deg... 1.2-m f/2.4 Schmidt... Zwicky Transient Facility, I41 (Palomar Observatory, California, USA)

Comet 60P/Tsuchinshan
2019 Feb. 10.45 UT m(r) =14.78 ± 0.02 Dia.=0.8' Tail=&18' in PA 298 deg... 1.2-m f/2.4 Schmidt... Zwicky Transient Facility, I41 (Palomar Observatory, California, USA)

Image credit: IRSA/Caltech/NASA See less