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* * * * * C/2025 A6 (Lemmon) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2025 11 21.95 aM 5.2 HD 10.0B 20 3 6 30m 90 GOI Araçatuba (Comet altitude 4.5°, Sun altitude -13°.) 2025 11 20.95 aM 5.0 HD 10.0B 20 3 6 40m 90 GOI Araçatuba (Comet altitude 5°, Sun altitude -13°.) 2025 11 18.95 aM 4.9 HD 5.0B 7 4 5 1 80 GOI Araçatuba (Comet altitude 6°.) 2025 11 14.45 B 5.3 AA 10.0B 25 1 70 SEA Cowra, NSW (Appeared considerably fainter, but part of this may have been low elevation.) 2025 11 12.720 S 5.5:TK 8.0B 15 8 41m 66 DIJ Burlage (Comet altitude 4°, Sun at -14.7°.) 2025 11 10.95 aI 4.6 HD 0.7E 1 9 GOI Araçatuba 2025 11 10.95 aM 4.7 HD 5.0B 7 10 6 3 75 GOI Araçatuba (Comet altitude 9°, Sun altitude -14°.) 2025 11 10.45 B 4.4 AA 10.0B 25 > 1 60 SEA Cowra, NSW (Tail may have been traced for 2 degrees, but background sky too light to be certain.) 2025 11 9.95 aI 4.5 HD 0.7E 1 9 GOI Araçatuba 2025 11 9.95 aM 4.6 HD 5.0B 7 12 6 3 70 GOI Araçatuba (Comet altitude 10°, Sun altitude -14°.) 2025 11 9.73 sS 5.0 TK 8.0B 15 7 0.2 65 SCH Eerbeek (Compact coma with short dusttail. Altitude comet 6.7°, altitude Sun -16°.) 2025 11 9.720 S 5.2 TK 8.0B 15 2 8 1.0 67 DIJ Burlage (Altitude comet 7.5°, Sun -14°.) 2025 11 9.42 B 4.6 AA 10.0B 25 & 1 SEA Cowra, NSW (Tail impressive in 25x100B.) 2025 11 8.42 B 4.8 AA 5.0B 10 SEA Cowra, NSW 2025 11 6.725 S 5.0 TK 8.0B 15 8 0.5 57 DIJ Burlage (Full Moon. Altitude comet 10°, Sun -14°.) 2025 11 4.94 M 4.5 HD 5.0B 7 6 5 GOI Araçatuba (Moonlight, comet altitude 11°.) 2025 11 2.726 S 4.5 TK 8.0B 15 3.5 8 2.4 56 DIJ Burlage (Moonlight. Altitude comet 11.6° with Sun at -14.5°.) 2025 11 2.38 M 4.4 YG 7.0R 10 6 7/ 0.6 55 YOS Mt. Hanadate, Ibaraki (Nice view with a fine tail, although the tail did not look long due to the thin clouds.) 2025 11 1.94 M 4.5:HD 10.0B 20 4 6 GOI Araçatuba (Clouds, moonlight, comet altitude 9°.) 2025 11 1.746 S 4.3 TK 8.0B 15 5 8 1.2 57 DIJ Burlage (Moonlight. Comet altitude 11.5°.) 2025 11 1.38 M 4.3 YG 6.6R 10 7 7/ 1.0 50 YOS Miura, Kanagawa (Very nice view with a fine tail.) 2025 10 30.765 S 4.2 TK 5.0B 10 8 1.3 58 DIJ Scheemda, Netherlands (Moonlight. Comet altitude 11°.) 2025 10 27.747 I 3.9 TK 0.0E 1 8 DIJ Burlage 2025 10 27.747 S 4.2 TK 8.0B 15 6 7/ 3 35 DIJ Burlage (Moonlight.) 2025 10 27.744 aM 3.8 YG 5.0B 10 7 3.5 41 BOU Westerwijtwerd (31% lit Moon 5° over southern horizon.) 2025 10 27.74 S 3.9 TK 0.0E 1 7 SCH Bussloo (Altitude 21°, altitude Sun -15°. In 15x80B, small iontail of about 2.5° in p.a. 45 deg. Slightly broader dusttail of about 0.5° in same p.a.) 2025 10 27.739 S 4.3 TK 3.5B 9 3 8 1 LOO Genk 2025 10 26.82 M 3.8 TK 5.0B 10 12 6/ 6.5 30 GON Alto de la Camperona, León (Also dust tail 2.5°.) 2025 10 26.81 I 3.7 TK 0.0E 1 10 7 2.5 30 GON Alto de la Camperona, León 2025 10 25.758 M 3.8 YG 5.0B 7 7/ 4 35 BOU Westerwijtwerd 2025 10 25.753 I 3.8 TK 0.0E 1 8/ DIJ Burlage 2025 10 25.75 S 4.1 TK 0.0E 1 6 SCH Bussloo (Altitude 17°. In 15x80B tail of about 1.8° in p.a. 30 deg. Bright central condensation in 35.6T.) 2025 10 25.747 S 4.1 TK 8.0B 15 5 8/ 4 20 DIJ Burlage 2025 10 25.742 S 3.8 TK 5.6B 8 3 8 1 25 LOO Genk 2025 10 24.78 S 4.1 TK 0.0E 1 6 SCH Eerbeek (Altitude 16°. In 15x80B, tail of about 1.6° in p.a. 30 deg.) 2025 10 24.763 M 3.7 YG 5.0B 7 7/ 4.5 30 BOU Westerwijtwerd 2025 10 24.747 M 3.8 YG 8.0B 15 8 7 4 27 BOU Westerwijtwerd (Also broad dusttail slightly curving to the right (west) about 2° in length in p.a. 20 deg. Some twilight. Comet altitude 22.2° with Sun at -15.3°.) 2025 10 24.742 S 4.6 TK 5.0B 10 6 7/ 6 20 DIJ Hemmelsberg (Twilight. Altitude comet 22.3° with Sun at -14.7°.) 2025 10 22.78 S 3.9 TK 5.6B 8 & 8 5 1.2 20 SCH Eerbeek (Altitude 19°. Altitude Sun -21°. Tail slightly better and longer in 15x80B.) 2025 10 22.760 S 4.5 TK 5.6B 8 2.5 7 1 13 LOO Genk 2025 10 22.75 S 3.8 TK 0.0E 1 6 SCH Eerbeek (Altitude 23°. Altitude Sun -15°.) 2025 10 20.767 I 3.6 TK 0.0E 1 8/ 1.3 1 DIJ Burlage 2025 10 20.764 S 4.1 TK 5.0B 10 6 8/ 4.7 2 DIJ Burlage 2025 10 18.188 S 4.6 TK 5.0B 10 5 7/ 3 347 DIJ Burlage (Moonlight. Comet visible to naked eye.) 2025 10 17.80 I 4.5 TK 0.0E 1 10 7 GON Vega Redonda - Macizo Occidental de Picos, Asturias 2025 10 17.751 S 4.8 TK 8.0B 15 6 7/ 3.2 343 DIJ Burlage 2025 10 17.22 I 4.6 TK 0.0E 1 10 7 GON Collado de la Fragua - Macizo Occidental de Picos de Europa, Asturias 2025 10 16.747 S 5.0 TK 8.0B 15 5 7/ 1.3 354 DIJ Burlage (Twilight. Altitude comet 21.1° with Sun at -13.4°.) 2025 10 15.80 I 4.8 TK 0.0E 1 10 7 GON Gamoniteiro - Sierra del Aramo, Asturias 2025 10 15.79 M 5.0 TK 5.0B 10 12 6/ 1.6 340 GON Gamoniteiro - Sierra del Aramo, Asturias (Altitude 14°.) 2025 10 13.860 S 5.6 TK 5.0B 10 5.6 7 1.9 330 DIJ Burlage 2025 10 13.758 S 5.5 TK 8.0B 15 4.5 7 1.4 1 DIJ Burlage 2025 10 10.80 M 5.2 TK 5.0B 10 15 6/ GON Alto del Trichero, León (Astronomical twilight. Altitude 7°.) 2025 10 9.167 S 5.9 TK 5.0B 10 8 7 DIJ Burlage (Moonlight.) 2025 10 9.149 S 6.0 TK 8.0B 15 6 7 44m 318 DIJ Burlage (Moonlight.) 2025 10 5.120 S 6.5 TK 8.0B 15 5.6 7 1.4 315 DIJ Burlage (Moonlight.) 2025 10 2.125 S 7.2 TK 8.0B 15 7.1 7 50m 298 DIJ Burlage 2025 10 2.12 S 6.3 TK 5.6B 8 10 6 SCH Eerbeek (In 15x80B, weak tail of about 0.7° in p.a. 305 deg.) 2025 10 2.096 S 7.0 TK 5.6B 8 2.5 6 LOO Genk 2025 10 1.18 B 6.7 TK 5.0B 10 6 6/ 1.3 300 GON Collada de Aralla, León 2025 10 1.146 S 7.0 TK 8.0B 15 7 7 DIJ Burlage 2025 10 1.121 M 6.8 TK 8.0B 15 7 6/ 0.5 305 BOU Westerwijtwerd 2025 9 30.18 B 6.6 TK 5.0B 10 6 6/ 1.3 300 GON Collada de Aralla, León 2025 9 30.083 S 6.9 TK 8.0B 15 6.5 7 DIJ Burlage 2025 9 28.34 S 7.0:TK 10.0B 20 3 4/ GOI Araçatuba (Comet altitude 8°, Sun altitude -12°.) 2025 9 28.125 S 7.4 TK 8.0B 15 7.8 7 DIJ Burlage 2025 9 28.097 S 7.1 TK 10.0B 25 2.5 6 LOO Genk 2025 9 25.130 M 7.5 TK 8.0B 15 6 5/ BOU Westerwijtwerd 2025 9 25.127 S 7.3 TK 8.0B 15 6.5 6 DIJ Burlage 2025 9 24.19 S 7.4 TK 7.0B 15 7 4 GON Grandota - Oviedo, Asturias 2025 9 24.128 S 7.5 TK 8.0B 15 6.3 6 DIJ Burlage 2025 9 24.122 M 7.6 TK 8.0B 15 6 6 0.4 300 BOU Westerwijtwerd (Very faint tail visible.) 2025 9 24.10 S 7.6 TK 5.6B 8 8 6 SCH Eerbeek 2025 9 23.11 S 7.6 TK 8.0B 15 8 6 SCH Eerbeek (In 20.0L at 42x, hint of tail in p.a. 300 deg.) 2025 9 23.092 S 7.8 TK 8.0B 15 6 6 DIJ Burlage 2025 9 22.042 S 7.9 TK 8.0B 15 6 5 DIJ Burlage (Altitude 18.4°.) 2025 9 21.78 S 8.5 TJ 40.0L 36 4.0 6 YOS Kita-karuizawa, Gunma 2025 9 21.78 S 8.1 TJ 7.0R 10 5 7 YOS Kita-karuizawa, Gunma (Bright and easily visible!) 2025 9 20.14 S 7.6 TK 8.0B 15 6 6 SCH Eerbeek 2025 9 20.110 M 7.9 TK 8.0B 15 5.5 5/ BOU Sint Annen 2025 9 19.992 S 8.0 TK 8.0B 15 6 4 DIJ Burlage (Altitude 10.0°.) 2025 9 19.14 S 7.7 TK 8.0B 15 6 6 SCH Eerbeek 2025 9 19.126 S 8.5 TK 10.0B 14 2.5 6 LOO Genk 2025 9 18.17 S 7.7 TK 5.0B 10 8 4 GON Collada de Aralla, León 2025 9 6.113 M 9.9 TA 25.4J 58 3.2 5 BOU Sint Annen 2025 9 2.096 M 10.3 AQ 25.4J 58 2.8 4/ BOU Sint Annen 2025 9 1.17 S 10.1 TK 20.3T 77 5 3/ GON Villacintor, León 2025 8 29.097 M 10.6 AQ 25.4J 58 2.5 4/ BOU Sint Annen (Altitude 19.4°.) 2025 8 26.094 S 10.9 AQ 25.4J 58 2.5 3/ BOU Sint Annen (Altitude 17.5°.) 2025 8 25.099 S 10.8:AQ 25.4J 58 & 2 4 BOU Westerwijtwerd (Briefly observed in clearing between clouds. Altitude 18°.) 2025 8 25.097 S 11.0 AQ 15.5L 63 2.2 3/ DIJ Burlage (Altitude 18.1°.) 2025 8 21.16 S 10.6 TK 20.3T 100 5 2/ GON Alto de la Camperona, León (Wide and diffuse outer coma. Altitude 18°.)