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* * * * * C/2021 A1 (Leonard) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2022 1 28.43 M 8.5 TK 25.0L 40 1.9 4 9m 98 WYA Walcha, NSW (Low altitude 3.5°. Faint tail visible.) 2022 1 22.46 B 7 AA 10.0B 25 &15m SEA Cowra, NSW (Low elevation. Coma small and ill-defined. Tail quite dense, apearing as a nebulous streak.) 2022 1 21.97 S 7.5 HD 10.0B 20 4 4 GOI Araçatuba (Comet altitude 9°.) 2022 1 13.45 M 6.8 TK 7.0B 15 5.6 5/ 1.3 103 WYA Walcha, NSW (Moonlight. Faint tail visible. Tail is semi-opaque for the first 20’ in length and fading gradually to its extremity.) 2022 1 8.48 B 5.3 AA 10.0B 25 & 2 SEA Cowra, NSW 2022 1 8.44 M 5.6 TK 7.0B 15 7.5 6 1.3 97 WYA Walcha, NSW (Moonlight. Faint tail visible.) 2022 1 4.47 I 4.7 AA 0.0E 1 SEA Cowra, NSW 2022 1 3.44 M 4.9 TK 0.0E 1 23 5/ 1.0 94 WYA Walcha, NSW 2022 1 3.44 M 5.4 TK 7.0B 15 6 5/ 5.0 98 WYA Walcha, NSW (Faint tail visible. Enhances well in Swan Band filter.) 2022 1 2.46 M 4.8 TK 0.0E 1 20 5/ 1.0 94 WYA Walcha, NSW 2022 1 2.45 M 5.1 TK 7.0B 15 7 6/ 2.2 94 WYA Walcha, NSW (Faint tail visible. The first degree or so is opaque and fading gradually.) 2022 1 1.97 M 4.8 HD 5.0B 7 8 7 1.5 95 GOI Araçatuba 2022 1 1.48 I 4.3 AA 0.0E 1 SEA Cowra, NSW (In 25x100B, tail length about 6°.) 2022 1 1.45 M 4.4 TK 0.0E 1 18 6 1.2 95 WYA Walcha, NSW 2022 1 1.45 M 4.7 TK 7.0B 15 7 6/ 3.6 95 WYA Walcha, NSW (Faint tail visible.) 2021 12 31.97 M 5.0 HD 5.0B 7 8 6 1.5 95 GOI Araçatuba 2021 12 31.47 I 4.5 AA 0.0E 1 SEA Cowra, NSW 2021 12 31.44 M 4.6 TK 0.0E 1 20 5/ 1.0 92 WYA Walcha, NSW 2021 12 31.44 M 4.9 TK 7.0B 15 6.5 6 3.2 92 WYA Walcha, NSW (Faint tail visible.) 2021 12 30.98 M 4.8 HD 5.0B 7 8 6 2 95 GOI Araçatuba 2021 12 30.76 S 4.8 TK 10.0B 25 6 7 GON Gaminteiro - Sierra del Aramo, Asturias (Altitude 3°. Astronomical twilight.) 2021 12 30.48 B 4.2 AA 0.0E 1 SEA Cowra, NSW 2021 12 30.44 M 4.5 TK 0.0E 1 20 5/ 1.0 90 WYA Walcha, NSW (Easily visible naked eye. Best compared with η Indi.) 2021 12 30.44 M 4.8 TK 7.0B 15 8 6/ 2.4 90 WYA Walcha, NSW (Comet in outburst. Faint tail visible. Disk-like inner coma with bright central condensation. Enhances in Swan Band filter. Coma appears more circular than parabolic in shape from previous observations. Through my 25.0cm-L at 40x I could see some smooth ‘jet-like’ features within the coma either side of the pseudo-nucleus radiating slightly forward and behind the pseudo-nucleus and perpendicular to the tail axis and almost the same diameter as the coma. It was best viewed with averted vision.) 2021 12 29.47 I 4.8 AA 0.0E 1 SEA Cowra, NSW 2021 12 29.44 M 4.8 TK 0.0E 1 17 3/ 1.0 90 WYA Walcha, NSW (Faintly visible naked eye.) 2021 12 29.44 M 5.3 TK 7.0B 15 7 6 8.5 90 WYA Walcha, NSW (Faint tail visible. A knot was observed as a large irregular diffuse patch about 4.7° from the coma. The tail was traced to υ PsA where it was about 1.2° in width and lost in the glare of bright stars. Coma and part of the tail enhanced in Swan Band filter. Altitude 18.8°.) 2021 12 28.47 B 4.3 AA 0.0E 1 SEA Cowra, NSW 2021 12 28.44 M 4.5 TK 7.0B 15 10 6 9.0 90 WYA Walcha, NSW (Faint tail visible. Altitude 18.8°.) 2021 12 27.98 M 4.4 HD 5.0B 7 8 6/ 2.5 95 GOI Araçatuba 2021 12 27.47 B 4.1 AA 0.0E 1 SEA Cowra, NSW 2021 12 26.97 I 3.7 HD 0.7E 1 8 GOI Araçatuba 2021 12 26.97 M 3.8 HD 5.0B 7 8 7 2.5 90 GOI Araçatuba 2021 12 26.48 I 4.2 AA 0.0E 1 SEA Cowra, NSW (Tail 3.5° in 15x80B. Some thin high cloud.) 2021 12 25.97 I 3.8 HD 0.7E 1 8 GOI Araçatuba 2021 12 25.97 M 4.0 HD 5.0B 7 10 7 3 90 GOI Araçatuba 2021 12 25.48 B 4.1 AA 0.0E 1 SEA Cowra, NSW (In 25x100B, tail length 5.5° in p.a. 90 deg. Central condensation less starlike than previous night. Tail visible NE, with averted vision possibly glimpsed to approx. 7 degrees.) 2021 12 25.44 M 4.3 TK 7.0B 15 10.7 5/ 2.6 88 WYA Walcha, NSW (Faint tail visible. Altitude 18.5°.) 2021 12 25.43 M 3.7 TK 0.0E 1 20 4 1.5 90 WYA Walcha, NSW (Appears as a fuzzy spot with almost stellar centre. Faint tail visible. Altitude 20.4°.) 2021 12 24.97 I 3.6 HD 0.7E 1 8 GOI Araçatuba 2021 12 24.97 M 3.7 HD 5.0B 7 12 7 2.5 95 GOI Araçatuba 2021 12 24.47 B 3.4 AA 0.0E 1 SEA Cowra, NSW 2021 12 24.47 10.0B 25 16 7 3.0 86 SEA Cowra, NSW (Outburst! Images of comet and comparison stars placed far out of focus, using spectacle lenses, for estimate.) 2021 12 23.47 I 4.3 AA 0.0E 1 SEA Cowra, NSW (In 25x100B, tail length 2.7° in p.a. 83 deg.) 2021 12 23.44 sM 5.0 TK 7.0B 15 8 6 2.5 90 WYA Walcha, NSW (Faint tail visible. Altitude 16.3°.) 2021 12 23.43 sM 4.6 TK 0.0E 1 20 4 WYA Walcha, NSW (Appears as a fuzzy spot with almost stellar centre. Altitude 18.8°.) 2021 12 22.97 M 4.5 HD 5.0B 7 8 6 1.0 95 GOI Araçatuba (Comet altitude 21°, Sun altitude -15°.) 2021 12 22.75 S 4.5 TK 10.0B 25 6 7 0.6 80 GON Sierra de Fario, Asturias (Altitude 5°. Start of evening astronomical twilight.) 2021 12 21.97 aI 4.0 HD 0.7E 1 7 GOI Araçatuba 2021 12 21.97 M 4.1 HD 5.0B 7 10 6/ 75m 90 GOI Araçatuba (Comet altitude 20°, Sun altitude -15°.) 2021 12 21.45 I 3.2 AA 0.0E 1 SEA Cowra, NSW 2021 12 21.45 10.0B 25 7 4.2 90 SEA Cowra, NSW (Tail spectacular in 25x100B, brighter portion glimpsed naked eye. Very slightly fainter through Swan Band filter.) 2021 12 20.97 aI 2.8 HR 0.7E 1 8 GOI Araçatuba 2021 12 20.97 aM 3.0 HR 5.0B 7 12 7 2.0 90 GOI Araçatuba (Comet altitude 18°, Sun altitude -15°.) 2021 12 20.45 I 3.3 AA 0.0E 1 SEA Cowra, NSW 2021 12 20.45 10.0B 25 8 8 1.3 90 SEA Cowra, NSW 2021 12 20.43 sB 3.6 TK 5.0R 10 5 8 0.5 80 WYA Walcha, NSW (Low altitude 14.4°. Faint tail visible. Sun altitude -15.7°. Moon altitude 2.7°.) 2021 12 19.96 M 4.6 HD 5.0B 7 7 6 1.5 90 GOI Araçatuba (Moonlight.) 2021 12 19.44 B 4.6 AA 10.0B 25 0.5 SEA Cowra, NSW (Somewhat enhanced through Swan Band filter.) 2021 12 18.96 S 4.4 HD 5.0B 7 7 6 1.5 90 GOI Araçatuba (Moonlight.) 2021 12 18.71 S 4.6 HV 25.6L 53 2.5 5 BIV 2021 12 17.75 S 4.7:HV 25.6L 53 2 3 BIV 2021 12 17.75 S 4.3 TK 5.0B 10 5 7 GON Gamoniteiro - Sierra del Aramo, Asturias (Altitude 6°. Start of evening astronomical twilight. Moonlight interference [phase 0.98].) 2021 12 17.43 sS 3.6 TK 7.0B 15 14 3 WYA Walcha, NSW (Extremely low altitude 2.0°. Moonlight interference. Sun altitude -16.6°. Appears as a faint smudge.) 2021 12 16.96 sS 3.1:HD 5.0B 7 7 6/ GOI Araçatuba (Many clouds. Comet altitude 6°.) 2021 12 16.75 S 3.4 TK 5.0B 10 7 6 GON Gamoniteiro - Sierra del Aramo, Asturias (In 25x100B: 0.4° tail in p.a. 70 deg. Altitude 5°. Start of evening astronomical twilight. Moonlight interference [phase 0.95].) 2021 12 15.75 S 3.3 TK 5.0B 10 7 6/ GON Sierra de Tineo, Asturias (Altitude 4°. Possible outburst. Near-stellar central condensation. Comparison stars near the same low altitude as the comet. Start of evening astronomical twilight. Some thin high clouds. Moonlight interference [phase 0.90 ].) 2021 12 11.25 S 5.1 HV 5.0B 7 20 3 BIV 2021 12 11.25 I 4.7 TK 0.0E 1 12 7 GON Mora - Sierra del Castillo de Peñas Negras, Toledo (Altitude 11°.) 2021 12 11.24 S 4.9 TK 5.0B 10 16 6/ 1.7 330 GON Mora - Sierra del Castillo de Peñas Negras, Toledo 2021 12 11.23 S 5.8 HV 25.6L 53 5 4 0.5 340 BIV 2021 12 11.226 S 6.0 TK 8.0B 15 11 6 2.0 328 DIJ Burlage 2021 12 11.22 aS 4.7 TK 5.6B 8 &15 6 1.5 330 SCH Eerbeek (Altitude 11°, (nearly?) not visible with naked eye due to low altitude.) 2021 12 10.23 aS 5.4 TK 5.6B 8 &15 6 1.5 325 SCH Eerbeek 2021 12 9.237 S 5.8 TK 5.0B 10 5 6 LOO Genk 2021 12 9.23 S 5.6 TK 5.6B 8 &14 6 1.3 320 SCH Eerbeek 2021 12 9.220 M 5.6 YG 5.0B 10 15 5 1.5 330 BOU Sint Annen 2021 12 9.164 S 6.4 TK 8.0B 15 10 6 1.9 328 DIJ Burlage 2021 12 8.23 S 5.9 TK 5.6B 8 &18 5/ 1.2 320 SCH Eerbeek 2021 12 8.23 S 6.3 HV 25.6L 53 8 5 0.4 330 BIV 2021 12 8.22 S 6.1 HV 5.0B 7 20 4 BIV 2021 12 8.192 S 6.0 TK 5.0B 10 5 5 LOO Genk 2021 12 7.216 M 5.8 YG 5.0B 10 15 5 1.6 320 BOU Sint Annen 2021 12 7.214 S 6.2 TK 5.0B 10 6 6 0.3 LOO Genk 2021 12 7.17 S 6.2 TK 5.6B 8 &12 6 1.2 315 SCH Eerbeek 2021 12 7.17 S 6.0 HV 5.0B 7 20 5 1.5 315 BIV 2021 12 3.25 S 6.4 TK 5.0B 10 12 5 2.4 310 GON Sierra de Santa Maria - Castrocontrigo, León 2021 12 3.063 S 7.2 TK 8.0B 15 9 6 DIJ Burlage 2021 12 2.24 S 7.8 HV 40.7L 72 9 5 0.5 315 BIV 2021 12 2.23 S 7.2 HV 5.0B 7 15 4 0.6 315 BIV 2021 12 2.16 S 6.5 TK 5.6B 8 &14 5 1.3 320 SCH Eerbeek (Comet 2.5 degrees from M3.) 2021 12 2.060 S 7.5 TK 8.0B 15 9 6 1.9 316 DIJ Burlage 2021 11 29.22 S 8.0 HV 40.7L 72 8 6 0.5 315 BIV 2021 11 29.22 S 7.4 HV 5.0B 7 10 5 1.0 315 BIV 2021 11 27.21 S 8.4 HV 40.7L 72 4 4 BIV 2021 11 22.16 S 8.1 TK 20.0L 42 4 4 SCH Eerbeek (Moonlight.) 2021 11 18.24 S 7.9 TK 10.0B 25 8 3 0.15 320 GON Llano de las Ovejas - Sierra del Teleno, León (Beginning of astronomical twilight. Some moonlight interference.) 2021 11 11.22 S 8.7 TK 10.0B 25 8 3 0.4 320 GON Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias 2021 11 11.21 S 9.2 TK 20.3T 77 6 3/ 0.3 320 GON Morrena Entrelagos - Macizo Occidental de Picos de Europa, Asturias 2021 11 11.18 S 9.8 TK 40.7L 72 6 5 0.33 325 BIV 2021 11 10.15 S 9.4 TK 20.0L 42 4 4 SCH Eerbeek 2021 11 9.16 S 9.7 TK 40.7L 72 5.5 5 0.25 330 BIV 2021 11 8.16 S 9.6 TK 20.0L 42 3 4 SCH Eerbeek 2021 11 6.22 S 10.3 AQ 40.7L 72 4.5 6 0.2 330 BIV 2021 11 5.23 S 9.7 TK 20.3T 77 5 3/ 0.3 330 GON Matadeon de los Oteros, León 2021 11 5.12 S 9.9 TK 20.0L 42 3 4 SCH Eerbeek 2021 11 5.064 S 10.2 AQ 15.5L 50 4.3 2/ DIJ Burlage 2021 10 14.15 S 11.7 AQ 40.7L 72 1.5 3 BIV 2021 10 9.19 S 11.7 AQ 40.7L 72 2 3 BIV 2021 10 7.20 S 11.2 TK 20.3T 100 5 2/ GON Alto del Castro, León (Brighter than expected. Wide and faint outer coma. Altitude 25°. Field stars checked in DSS. Limiting stellar magnitude near comet 14.0 [AQ].) 2021 10 7.14 S 12.0:AQ 40.7L 135 1.0 4 BIV 2021 10 4.15 S 12.5:HS 40.7L 135 1.0 4 BIV