My contribution to this paper ….
We had a four days campaign to try to nail the precise ephemeris because of large uncertainty due to TTV’s of this eight planet system.
Marked in circles are my observations, we got lucky on the 4rth day and western observers like myself got the ingress. Missed the 3rth day due to weather.
Below is my observation (ingress) of the 12.6h long transit. It is only ~4ppt depth and very faint so I had to use a CBB filter.
Telescope was an SCT Celestron C-14 and the CCD a KAF3200ME.
Joao Gregorio
aka gregas