C/2023 A3 (Tsuchinshan–ATLAS) Sep 16.793, 2024. m1 = 4.4 estimated by comparison with Delta Sextans and HIP 51784 using the green channel of a 30 second exposure (stack of 1sec) and a 6' diameter measurement aperture in Maxim DL. Camera Sony A7iii and 135/1.8 lens. Visual observation was not obtained because the comet did not clear the cloud deck until deep twilight. Location Wellington Point, QLD, Australia. This is a 6.5 degree wide crop from 135f1.8 + 3 x 1.6sec ISO640 exposures taken as the comet cleared the clouds |
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