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* * * * * C/2025 F2 (SWAN) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2025 4 27.86 S 8.4 TK 20.3T 77 2.5 2/ GON Camposagrado, León (Altitude 7°. Astronomical twilight.) 2025 4 27.858 S 9.2 TK 15.5L 29 2.5 2/ DIJ Burlage (Comet at 6.5° altitude with Sun at -13.4°.) 2025 4 24.17 S 8.7 TK 20.3T 77 2 3 GON Cueto Rosales, León (Altitude 5°. Astronomical twilight.) 2025 4 8.146 S 8.3 TK 10.0B 14 2.5 7 LOO Genk (Altitude 14°, round coma.) 2025 4 8.14 S 7.5 TK 20.0L 42 4 7 SCH Eerbeek (Altitude comet 14°, altitude Sun -14°.) 2025 4 8.14 S 7.5 TK 8.0B 15 & 5 6 SCH Eerbeek (Altitude comet 13°, altitude Sun -15°.) 2025 4 7.18 B 7.9 TK 7.0B 15 4 7 GON Cueto Rosales, León 2025 4 7.17 B 8.2 TK 20.3T 77 3.5 6 0.3 90 GON Cueto Rosales, León (Altitude 13°. Mountain location, very clear sky down to the horizon.) 2025 4 7.15 S 7.7 TK 20.0L 42 3 7 SCH Eerbeek (Alltitude comet 15°, altitude Sun -14°.) 2025 4 7.139 S 8.4 TK 10.0B 14 2 7 LOO Genk (Altitude 13°, round coma.) 2025 4 7.131 S 7.6 TK 8.0B 15 3.3 5 DIJ Burlage 2025 4 7.130 S 7.5 TK 15.5L 29 3.0 6/ DIJ Burlage (Moonlight.) 2025 4 7.128 M 7.8 TA 25.4J 58 2.7 7 BOU Westerwijtwerd (Some twilight and moonlight interference. Altitude comet 12.1° with Sun at -15.4° and Moon at 3.1°.) 2025 4 6.129 M 8.3 TA 25.4J 58 2.5 7 BOU Sint Annen (Considerably brighter and more condensed than 2 days ago. Comet altitude 11.7° with Sun at -15.7°.) 2025 4 5.15 S 8.9 TK 20.0L 42 & 2 7 SCH Eerbeek ((Altitude comet 14° with Sun at -14°.) 2025 4 5.133 S 8.7 TK 15.5L 42 2.5 5/ DIJ Burlage 2025 4 4.147 S 9.5 TK 15.5L 50 3 5 DIJ Burlage (Twilight. Altitude comet 14.7° with Sun at -12.8°.) 2025 4 4.126 S 9.4 TA 25.4J 58 2.5 4/ BOU Sint Annen (Altitude 10°. Well visible. Observed shortly after the start of astronomical twilight.)