* * * * * C/2017 T3 (ATLAS) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2018 8 29.37 S 12.3 AQ 25.0L 83 1.4 2/ WYA Walcha, NSW (Coma diffuse, slight brightening to centre. Low altitude 13.4°.) 2018 8 14.36 S 10.2 TK 25.0L 39 3.3 3 WYA Walcha, NSW (Low altitude 6.3°. Moonlight. Very diffuse.) 2018 8 13.36 M 10.2 TK 25.0L 39 2.6 4 WYA Walcha, NSW (Low altitude 5.4°. Coma diffuse, moderately condensed. Slight twilight interference.) 2018 8 8.79 M 9.6 TK 25.0L 39 3.2 5/ WYA Walcha, NSW (Low altitude 4.8°. Diffuse, compact and opaque centre. Slight Moonlight/twilight interference [Moon Alt 8.0°, 9.7% illuminated].) 2018 7 26.37 S 8.6:TK 10.0B 20 4 4 GOI Araçatuba (Comet altitude 12°. Nautical twilight with Sun altitude -12°. Comparison stars at the same comet altitude.) 2018 7 23.79 M 9.2 TK 25.0L 39 2.2 5 WYA Walcha, NSW (Low altitude 6.7°. Opaque centre, pale aqua-blue in colour. Enhances strongly in Swan band filter.) 2018 7 21.85 M 9.2 TK 40.6L 76 3.5 5 CAM Katherine, NT 2018 7 20.79 M 9.2 TK 25.0L 39 3.7 5/ WYA Walcha, NSW (Low altitude 6.7°. Opaque inner coma, aqua-blue in colour, stellar in good seeing.) 2018 7 18.79 M 9.3 TK 25.0L 39 3 5/ WYA Walcha, NSW (Low altitude 7.8°. Coma small and well condensed with an opaque centre, appears stellar in moments of good seeing. Enhances in Swan Band filter.) 2018 7 18.37 S 8.7 TK 10.0B 20 4 4/ GOI Araçatuba (Comet altitude 13°. Nautical twilight with Sun altitude -13°. Comparison stars at the same comet altitude.) 2018 7 16.79 M 8.9 TK 25.0L 39 5.2 5 WYA Walcha, NSW (Low altitude 7.7°. Opaque centre, well condensed, semi-transparent outer coma. Enhances in Swan Band filter.) 2018 7 13.79 M 9.4 TK 25.0L 39 3 6 3.8m 260 WYA Walcha, NSW (Low altitude 7.2°. Enhances in Swan Band filter. Faint tail visible. Faint stellar central condensation, opaque centre, diffuse edges.) 2018 7 11.79 M 9.3 TK 25.0L 39 4.4 4 WYA Walcha, NSW (Low altitude 7.4°. Coma diffuse, moderately condensed, opaque centre. Hint of coma extension to the SW approximately. Slight interference from zodiacal light. Enhances in Swan Band filter.) 2018 6 23.81 M 8.8 TK 25.0L 39 4.1 4 WYA Walcha, NSW (Low altitude 4.9°. Enhances in Swan Band filter. Opaque centre, moderately condensed. Zodiacal light and twilight interference.) 2018 6 22.81 M 9.4 TK 25.0L 39 2.8 4 WYA Walcha, NSW (Diffuse coma, moderately condensed. Enhances in Swan Band filter. Low altitude 5.7°. Interference from zodiacal light and twilight.)