Notes. From left to right: calender date, epoch, mid-transit time in BJD_TDB − 2 450 000 along with 1σ uncertainties, and derived O–C values in minutes without uncertainties, to facilitate the comparison with Fig. 3. The first section of the table shows literature values taken from Hartman et al. (2011) (H11), Stevenson et al. (2016) (S16), and Wakeford et al. (2017) (W17). The second section are the values derived in this work. The dates with an asterisk correspond to mid-transit times derived from complete transits. The two transit times from H11 are not individually measured transit times, but rather two reference times which are used in place of the period and reference epoch when simultaneously fitting all of the data, and assuming a constant linear ephemeris. Since both epochs differ, this will produce a spurious offset in the O–C diagram (see epoch zero in Fig. 3) unrelated to TTVs.