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* * * * * C/2021 G2 (ATLAS) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2025 8 26.43 M 14.4 AQ 40.0L 182 0.5 4/ WYA Walcha, NSW (Diffuse coma, opaque centre.) 2025 7 20.90 S 12.0 AQ 20.3T 100 2 2/ GON Alto del Castro - Aralla, León 2025 7 16.90 S 11.8 AQ 20.3T 100 2 2/ GON Alto de la Camperona, León 2025 6 26.92 S 11.8 AQ 20.3T 100 2.5 2/ GON Alto del Castro - Aralla, León 2025 6 15.93 S 11.9 TK 20.3T 133 2.5 3 GON Alto del Castro - Aralla, León 2025 5 26.93 S 11.8 TK 20.3T 100 2.5 3 GON Alto del Castro - Aralla, León 2025 5 18.949 S 13.5 AQ 30.5T 139 1.0 4 BOU Burlage, Germany 2025 5 18.947 S 13.8 AQ 30.5T 139 0.8 3 DIJ Burlage 2025 5 16.94 S 11.7 TK 20.3T 133 2.5 3/ GON Alto del Castro - Aralla, León 2025 5 15.942 S 13.8 AQ 30.5T 179 0.7 2 DIJ Burlage 2025 5 15.940 S 13.7 AQ 30.5T 179 0.9 4/ BOU Burlage, Germany 2025 4 26.961 S 13.9 AQ 30.5T 179 1.0 4/ DIJ Burlage 2025 4 26.958 M 13.8 AQ 30.5T 179 0.8 6 BOU Burlage, Germany (Faint object. Small, but well condensed.) 2025 4 24.02 S 11.7 TK 20.3T 100 2.5 3/ GON Cueto Rosales, León 2025 4 7.15 S 11.6 TK 20.3T 100 2 4 GON Cueto Rosales, León 2025 4 6.27 S 11.9 AU 22.0L 160 1 4 GOI Araçatuba 2025 1 5.70 M 13.6 AQ 40.0L 182 0.7 4/ WYA Walcha, NSW (Diffuse coma, opaque centre.) 2024 8 29.37 M 14.1 AQ 40.0L 108 0.6 5/ WYA Walcha, NSW (Diffuse. Small faint stellar pseudo-nucleus visible in good seeing.) 2024 8 3.37 M 14.4 AQ 40.0L 182 0.5 5/ WYA Walcha, NSW (Coma semi-opaque outer, opaque centre. Pseudo-nucleus visible in good seeing periods. Glare from bright star nearby.) 2024 6 1.92 S 12.7 AQ 20.3T 133 1.5 4 GON Cueto Rosales, León 2024 5 29.42 M 13.9 AQ 40.0L 182 0.7 6 WYA Walcha, NSW (Diffuse. Opaque centre.) 2024 5 28.41 M 13.8 AQ 25.0L 125 1.0 5/ WYA Walcha, NSW (Opaque centre, very diffuse, sometimes stellar at centre in good seeing.) 2024 5 26.36 M 13.9 AQ 25.0L 125 0.6 5/ WYA Walcha, NSW (Difficult. Stellar pseudo-nucleus visible in good seeing periods. Coma centre opaque and transparent outer coma.) 2024 5 12.49 M 13.9 AQ 25.0L 125 0.4 5/ WYA Walcha, NSW (Close to star but resolvable. Small coma, faint stellar pseudo-nucleus visible in good seeing periods.) 2024 5 7.50 M 13.5 AQ 40.0L 182 0.7 6 WYA Walcha, NSW (Stellar pseudo-nucleus visible, opaque coma.) 2024 4 10.41 M 13.9 AQ 40.0L 108 0.9 6 WYA Walcha, NSW (Stellar pseudo-nucleus visible. Opaque coma.) 2024 4 7.45 M 13.7 AQ 40.0L 108 0.6 6 WYA Walcha, NSW (No enhancement in Swan Band filter. Stellar pseudo-nucleus visible, opaque inner coma.) 2024 3 12.46 M 14.0 AQ 40.0L 108 1.0 6 WYA Walcha, NSW (Dims in Swan Band filter. Stellar pseudo-nucleus visible.) 2024 3 7.45 M 13.7 AQ 40.0L 108 0.8 4/ WYA Walcha, NSW (Opaque centre.) 2024 3 5.51 M 14.3 AQ 40.0L 182 0.5 4/ WYA Walcha, NSW (Opaque, sometimes faintly stellar at centre.) 2024 2 13.52 M 14.6 AQ 40.0L 182 0.6 5/ WYA Walcha, NSW (Stellar pseudo-nucleus visible sometimes in good seeing.) 2024 2 2.50 M 14.7 AQ 40.0L 182 0.4 3/ WYA Walcha, NSW (Very diffuse, visible in good seeing.) 2024 1 21.68 M 15.0 AQ 40.0L 182 0.5 5 WYA Walcha, NSW (Diffuse, opaque centre.) 2024 1 18.67 M 14.0 AQ 40.0L 182 0.7 4 WYA Walcha, NSW (Close to star but resolvable. Diffuse, opaque centre.) 2023 12 11.66 M 14.7 AQ 40.0L 182 0.5 3/ WYA Walcha, NSW (Difficult due to scintillation. Diffuse with weak and opaque centre.)