C/2023 A3 (Tsuchinshan–ATLAS) : Sep 18.780 2.5sec exposure Sony A7iii + 135/1.8 lens over North Stradbroke Island, QLD, Australia. Observation: Sep 18.785, 2024. m1 = 4.0 estimated by comparison with Delta Sextans using the green channel of a 75 second exposure (stack of 30x2.5sec) and a 6' diameter measurement aperture in Maxim DL. Camera Sony A7iii and 135/1.8 lens. Visible dimly in 10x42 Binoculars as a fuzzy star with a hint of tail. Low altitude, twilight and full moon severely impacted observation. Location Wellington Point, QLD, Australia |
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