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* * * * * C/2023 H2 (Lemmon) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2024 1 3.43 S 13.2 AQ 40.0L 108 2.2 2 WYA Walcha, NSW (Slight twilight interference. Very diffuse, close to star.) 2023 12 14.80 S 9.0 TK 20.3T 77 4 2/ GON Villacintor, León (Low altitude 4°.) 2023 12 9.99 S 8.9 TK 10.0B 20 8 2 GOI Araçatuba 2023 12 9.98 S 9.0 TK 22.0L 60 7 2/ GOI Araçatuba 2023 12 5.44 M 9.4 TK 40.0L 59 5.5 4/ WYA Walcha, NSW (Enhances in Swan Band filter. Opaque centre, pale-aqua blue in colour.) 2023 12 2.79 S 8.9 TK 20.3T 77 7 3 GON Embalse de Barrios de Luna, León 2023 11 17.778 S 8.3 TK 8.0B 15 9 3 DIJ Burlage 2023 11 16.98 S 7.5 HD 10.0B 20 10 3 GOI Araçatuba 2023 11 16.77 S 6.3 TK 5.0B 10 18 3 GON Cueto Rosales, León 2023 11 14.40 M 6.5 TK 5.0R 10 12 3/ WYA Walcha, NSW (Diffuse, opaque centre.) 2023 11 13.76 S 6.6 TK 8.0B 15 &15 4 SCH Bussloo (In between clouds. Movement between stars clearly visible in 20 minutes [21’/h].) 2023 11 12.96 S 6.3 HD 5.0B 7 18 2/ GOI Araçatuba 2023 11 12.95 S 6.5 HD 10.0B 20 15 3/ GOI Araçatuba 2023 11 12.92 S 5.9 TK 5.0B 10 23 3 GON Demués-Onís, Asturias 2023 11 12.762 S 6.8 TK 8.0B 15 15 6 DIJ Burlage 2023 11 12.740 S 6.6 HI 8.0B 15 12 3/ BOU Sint Annen 2023 11 11.724 S 6.8 TK 5.0B 10 8 6 LOO Genk 2023 11 11.72 S 6.8 TK 8.0B 15 &15 3 SCH Bussloo (Twilight, altitude Sun -12°.) 2023 11 11.94 S 6.2 HD 5.0B 7 15 2/ GOI Araçatuba 2023 11 11.890 S 7.5 TK 8.0B 15 5 4/ DIJ Burlage (Low altitude, 8°.) 2023 11 7.762 S 7.2 TK 10.0B 14 6 6 LOO Genk 2023 11 6.83 S 6.6 TK 20.3T 77 18 4 1.6 20 GON Vallecillo, León (Brighter inner coma : m=7.5, 7'.) 2023 11 6.82 S 6.3 TK 5.0B 10 22 3 1.4 20 GON Vallecillo, León 2023 11 6.775 S 7.7 TK 10.0B 14 6.5 5 LOO Genk 2023 11 6.763 S 7.4 TK 8.0B 15 9 5 DIJ Burlage 2023 11 5.960 S 7.6 TK 8.0B 15 4.5 5/ DIJ Burlage 2023 10 25.137 M 9.1 TA 25.4J 47 5 4 BOU Sint Annen 2023 10 25.11 S 9.4 TK 20.0L 42 3 5 SCH Eerbeek 2023 10 23.107 S 9.2 TA 25.4J 58 4.5 3/ BOU Westerwijtwerd 2023 10 23.062 S 10.0 AQ 15.5L 50 2.8 4 DIJ Burlage 2023 10 21.22 S 7.3 TK 20.3T 77 18 3 GON Quintanilla de las Torres, Palencia (Wide and very diffuse outer coma. Brighter inner coma : m=9.1, 5'. Several stars inside the coma, the brightest being mag. 10.0 [TK]. Altitude 32°.) 2023 10 20.82 S 9.4 TJ 40.0L 36 6 4/ YOS Kita-karuizawa, Gunma (I was surprised that it was much brighter than expected! I felt it was much brighter and easier to see than 103P.) 2023 10 17.795 S 10.5 AQ 15.5L 50 2.5 2/ DIJ Burlage 2023 10 17.774 S 9.7 TA 25.4J 47 4.5 2/ BOU Westerwijtwerd 2023 10 14.789 S 9.8 TA 25.4J 47 5 2 BOU Westerwijtwerd (Very diffuse object, considerably fainter than nearby M106.) 2023 10 14.780 S 11.0 AQ 15.5L 50 3.5 3 DIJ Burlage 2023 10 9.81 S 8.4 TK 20.3T 77 14 2 GON Alto del Castro, León (Altitude 15°.) 2023 10 5.81 S 8.4 TK 20.3T 77 14 2/ GON Alto del Castro, León (Altitude 15°.) 2023 10 2.82 S 8.3 TK 20.3T 77 14 2 GON Pandorado, León (Altitude 16°.) 2023 9 24.19 S 8.9 TK 20.3T 77 12 1/ GON Alto del Castro, León (Observation made under better conditions, from a higher and darker mountain location, providing a much wider coma diameter and brighter m1 estimate in comparison with my previous Sep. 18.83 observation.) 2023 9 18.83 S 9.3 TK 20.3T 100 7 1/ GON Santas Martas, León (Significantly brighter than expected. Large and very diffuse outer coma.)