* * * * * C/2019 T4 (ATLAS) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2023 7 22.48 M 13.0 AQ 25.0L 125 1.3 3 WYA Walcha, NSW (Diffuse, opaque centre.) 2023 7 14.43 M 13.6 AQ 40.0L 108 1.2 5 WYA Walcha, NSW (Diffuse, opaque centre.) 2023 6 19.90 S 13.4 AQ 63.5L 127 1.5 7 SCH Tivoli, Namibia 2023 6 19.40 M 13.7 AQ 40.0L 108 1.3 6 WYA Walcha, NSW (Opaque centre, faint stellar pseudo-nucleus visible in good seeing, extended outer coma.) 2023 6 13.96 S 12.2 AQ 20.3T 100 1.3 3/ GON Alto del Trichero, León 2023 6 10.40 M 13.6 AQ 40.0L 108 1.9 5/ WYA Walcha, NSW (Semi-transparent coma. Opaque centre, faintly stellar.) 2023 6 9.41 M 13.7 AQ 40.0L 108 1.3 6 WYA Walcha, NSW (Diffuse and transparent outer coma, faint stellar pseudo-nucleus.) 2023 5 23.45 M 13.3 AQ 40.0L 59 2.0 6 WYA Walcha, NSW (Stellar pseudo-nucleus visible, extended semi-transparent outer coma.) 2023 4 19.50 M 13.2 AQ 40.0L 108 1.2 4/ WYA Walcha, NSW (Diffuse. Close to star but resolvable.) 2023 3 30.69 M 13.4 AQ 40.0L 108 1.2 4/ WYA Walcha, NSW (Coma slightly elongated to SW approximately.) 2023 3 18.67 M 13.0 AQ 40.0L 59 1.9 4/ WYA Walcha, NSW 2023 2 2.70 M 13.6 AQ 25.0L 125 0.7 4/ WYA Walcha, NSW (Close to faint star. Opaque centre, transparent outer coma. Poor seeing.) 2022 8 20.39 M 13.4 AQ 40.0L 108 1.4 4 WYA Walcha, NSW (Opaque centre, diffuse outer coma. Altitude 18.6°. Zodiacal light interference.) 2022 7 25.47 M 12.9 AQ 40.0L 108 1.1 6 WYA Walcha, NSW (Opaque centre, stellar pseudo-nucleus visible. Low altitude 11.8°.) 2022 6 30.93 S 10.7 TK 20.3T 100 5 2/ Alto del Trichero - Soto y Amío, León (Altitude 15°.) 2022 6 27.93 S 10.9 TK 20.3T 77 4 3 Alto del Trichero - Soto y Amío, León (Altitude 15°.) 2022 6 24.45 M 13.0 AQ 40.0L 108 1.0 6 WYA Walcha, NSW (Stellar pseudo-nucleus visible, close to stars but resolvable.) 2022 6 22.47 M 12.7 AQ 40.0L 108 1.6 6 WYA Walcha, NSW (Diffuse outer coma, opaque inner coma, stellar pseudo-nucleus visible. Disappears in Swan Band filter.) 2022 6 5.44 M 12.2 AQ 40.0L 59 1.9 5/ WYA Walcha, NSW (Moonlight. Diffuse, opaque centre. Faint stellar pseudo-nucleus visible.) 2022 5 25.99 S 10.7 TK 20.3T 100 4 3 GON Cueto Rosales, León 2022 5 6.48 M 12.3 AQ 40.0L 59 2.1 6 WYA Walcha, NSW (Stellar pseudo-nucleus, opaque inner coma, transparent outer.) 2022 5 4.93 S 10.4 TK 20.3T 77 5 3/ GON Camposagrado - Cuadros, León 2022 5 3.44 M 12.2 AQ 40.0L 59 2.2 6 WYA Walcha, NSW (Stellar pseudo-nucleus. Opaque inner coma, transparent outer coma.) 2022 5 2.40 M 12.3 AQ 40.0L 59 1.5 6 WYA Walcha, NSW (Stellar pseudo-nucleus visible, m2 about mag 13.9.) 2022 4 28.92 S 10.6 TK 20.3T 77 4 3 GON Cueto Rosales, León 2022 4 23.884 S 12.1 AQ 31.0J 89 1.2 2/ DIJ Burlage 2022 4 23.881 S 12.0 AQ 31.0J 89 1.3 4 BOU Burlage, Germany 2022 4 22.00 S 11.6 AU 22.0L 160 1 3 GOI Araçatuba 2022 4 20.37 M 11.6 AQ 40.0L 59 1.2 6 WYA Walcha, NSW (Opaque centre, stellar pseudo-nucleus visible.) 2022 4 19.911 S 12.2 AQ 31.0J 89 1 2/ DIJ Burlage 2022 4 19.903 S 11.9 AQ 31.0J 89 1.3 4 BOU Burlage, Germany 2022 4 5.45 M 11.6 AQ 40.0L 59 1.2 6 WYA Walcha, NSW (Star in coma.) 2022 4 4.48 M 11.9 AQ 40.0L 59 1.3 6 WYA Walcha, NSW (No enhancement in Swan Band filter. Stellar pseudo-nucleus visible, opaque inner coma, thin diffuse outer coma.) 2022 4 1.91 S 10.8 TK 20.3T 100 4 3 GON Matadeon de los Oteros, León (Mag. 13.0 [AQ] star in coma.) 2022 4 1.01 S 12.7 AQ 40.7L 72 1.0 6 BIV 2022 3 28.03 S 12.4 AQ 40.7L 72 1.4 6 BIV 2022 3 22.96 S 12.4 AQ 40.7L 72 1.3 5 BIV 2022 3 22.42 M 12.3 AQ 40.0L 108 0.9 6 WYA Walcha, NSW (Opaque centre, stellar pseudo-nucleus. Coma almost disappears using Swan Band filter.) 2022 3 21.41 M 12.2 AQ 40.0L 108 1.2 6 WYA Walcha, NSW (Moonlight interference [just on Moonrise]. Stellar pseudo-nucleus, opaque inner, small outer transparent coma.) 2022 3 8.02 S 12.4 AQ 40.7L 72 1.5 6 BIV 2022 3 7.17 S 11.8 AU 22.0L 160 1 5 GOI Araçatuba 2022 2 9.72 M 12.7 AQ 25.0L 125 1.0 5 WYA Walcha, NSW (Close to mag 12.1 star but resolvable.) 2022 2 7.55 M 12.5 AQ 25.0L 125 0.8 5/ WYA Walcha, NSW (Small coma, opaque centre.) 2022 1 31.49 M 12.7 AQ 25.0L 125 1.2 5/ WYA Walcha, NSW (Stellar pseudo-nucleus visible in good seeing. Diffuse outer coma.) 2022 1 3.52 M 13.3 AQ 25.0L 182 0.9 3/ WYA Walcha, NSW (Difficult, visible in periods of good seeing. Low altitude 8.1°.) 2022 1 2.25 S 12.5 AU 22.0L 160 0.5 5 GOI Araçatuba 2021 12 14.71 M 13.4 AQ 40.0L 108 0.7 5/ WYA Walcha, NSW (Coma dims in Swan band filter. Close to galaxy NGC 3923, 4.6’ away.) 2021 12 3.24 S 12.1 AQ 20.3T 133 2.0 3 GON Sierra de Santa Maria - Castrocontrigo, León (Altitude 16°.) 2021 10 9.73 M 13.8 AQ 40.0L 261 0.5 6 WYA Walcha, NSW (Altitude 13.0°. Coma diffuse and opaque. Faint star in coma.) 2021 7 12.39 M 14.6 AQ 40.0L 182 0.4 4/ WYA Walcha, NSW (Altitude 13.9°. Diffuse, opaque centre.) 2021 7 5.42 M 14.4 AQ 40.0L 182 0.5 4/ WYA Walcha, NSW (Low altitude 11.5°. Diffuse, opaque centre.) 2021 6 27.36 M 14.3 AQ 40.0L 182 0.6 4 WYA Walcha, NSW (Diffuse, sometimes faint pseudo-nucleus visible in good seeing.) 2021 6 6.38 M 14.3 AQ 40.0L 182 0.5 6 WYA Walcha, NSW (Diffuse with faint stellar pseudo-nucleus visible.) 2021 5 31.38 M 14.3 AQ 40.0L 182 0.5 5/ WYA Walcha, NSW (Diffuse, opaque coma with faint stellar pseudo-nucleus visible in good seeing.) 2021 5 17.47 M 13.5 AQ 40.0L 261 0.6 5 WYA Walcha, NSW (Difficult due to proximity to star in coma.) 2021 5 13.45 M 14.4 AQ 40.0L 261 0.2 5 WYA Walcha, NSW (Small with opaque centre.) 2021 4 30.38 M 14.5 AQ 40.0L 261 0.3 5/ WYA Walcha, NSW (Diffuse and small, opaque centre that sometimes appears stellar in periods of good seeing.) 2021 4 12.44 M 14.1 AQ 40.0L 261 0.3 5/ WYA Walcha, NSW (Difficult due to bright star but coma is resolvable. Faint stellar pseudo-nucleus visible in good seeing.) 2021 4 10.42 M 14.3 AQ 40.0L 182 0.4 5/ WYA Walcha, NSW (Very small, faint stellar pseudo-nucleus visible in good seeing. Opaque outer coma.) 2021 1 25.68 M 14.2 AQ 40.0L 182 1.0 5/ WYA Walcha, NSW (Faint pseudo-nucleus visible in periods of good seeing.) 2021 1 23.64 M 14.2 AQ 40.0L 182 0.9 6 WYA Walcha, NSW (Faint stellar pseudo-nucleus visible, small and opaque coma.)