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* * * * * C/2023 P1 (Nishimura) * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2023 12 11.67 S 12.8 AQ 40.0L 182 1.5 2 WYA Walcha, NSW (Very diffuse. Extended featureless and transparent coma.) 2023 9 21.36 M 4.0:TK 25.0L 40 8 WYA Walcha, NSW (Magnitude uncertain. Low altitude 2.3°, deep twilight, lack of comparison stars. Sun altitude -10.7°. Coma very small, I may have only been seeing the central condensation. Fainter than magnitude 2.7 star, γ Virginis 1.4° away and mag 3.6 star δ Virginis 5.0° away. No extinction corrections applied.) 2023 9 18.80 I 2.5 TK 20.3T 77 0.2 8 GON Santas Martas, León (Near-stellar appearance. Fainter than the comparison star Denebola at the same low altitude as the comet [4°.]) 2023 9 9.15 S 4.5:TK 5.6B 8 2 8 SCH Eerbeek (Very compact coma [almost 'starlike']. Altitude 7.4° above horizon [altitude Sun -14°]. Tail of about 0.5 degree in p.a. 300 degrees weakly visible in 15x80B and 20.0L. Slightly greenish coma.) 2023 9 9.136 aS 4.0 TK 5.0B 10 9 DIJ Burlage (Moonlight. Comet altitude 6.6° with Sun at -14°.) 2023 9 9.135 aS 4.2 TK 8.0B 15 4 8/ 0.9 319 DIJ Burlage (Moonlight. Comet altitude 6° with Sun at -15°.) 2023 9 8.135 S 5.1 TK 5.0B 8 3 7 LOO Genk (Moonlight. Twilight. Comet altitude 7°.) 2023 9 8.135 aS 4.5 TK 8.0B 15 4 9 3 313 DIJ Burlage (Moonlight. Comet altitude 9° with Sun at -15°.) 2023 9 8.13 aS 4.5 TK 5.6B 8 2 8 SCH Eerbeek (Very compact coma [almost 'starlike']. Altitude 6.3° above horizon [altitude Sun -16°]. Tail of about 0.7 degree in p.a. 300 degrees weakly visible in 15x80B, a little better in 20.0L. Slightly greenish coma.) 2023 9 8.129 aB 4.8 YG 8.0B 15 8 1.3 320 BOU Westerwijtwerd (Moonlight, twilight. Comet altitude 7.0° with Sun at -15.7°.) 2023 9 7.14 S 5.5 TK 5.6B 8 2 8 0.5 310 SCH Eerbeek (Very compact coma [almost 'starlike']. Reference-star close to comet on same altitude. Altitude 9.5° above horizon [altitude Sun -15°]. Tail weakly visible in 8x56B and 15x80B. Slightly greenish coma.) 2023 9 7.130 B 5.1 YG 8.0B 15 2 8 1.0 315 BOU Westerwijtwerd (Moonlight, twilight. Comet altitude 8.8° with Sun at -15.3°.) 2023 9 7.128 S 5.1 TK 5.0B 10 9 DIJ Burlage (Moonlight. Comet altitude 11° with Sun at -15°.) 2023 9 7.127 S 5.3 TK 5.0B 8 3 7 LOO Genk (Moonlight. Twilight. Comet altitude 7°.) 2023 9 7.122 S 5.3 TK 8.0B 15 5 8/ 1.7 304 DIJ Burlage (Moonlight. Comet altitude 9° with Sun at -15°.) 2023 9 6.128 S 5.5 TK 8.0B 15 6 8 1.2 295 DIJ Burlage (Moonlight. Comet altitude 12° with Sun at -15°.) 2023 9 6.126 aB 5.2 YG 8.0B 15 3 7/ 1.2 300 BOU Westerwijtwerd (Moonlight, twilight. Comet altitude 9.4° with Sun at -15.8°.) 2023 9 5.17 S 5.5 TK 5.0B 10 3 7/ 0.8 300 GON Alto de Sedano, Burgos (Moonlight interference. Altitude 11°. Comparison stars at the same low altitude as the comet.) 2023 9 5.16 S 5.7 TK 8.0B 20 3 6/ 0.8 300 GON Alto de Sedano, Burgos 2023 9 5.132 B 5.4 YG 8.0B 15 8 1.0 305 BOU Westerwijtwerd (Comet strongly condensed. Very faint gas tail visible. Moonlight, twilight. Comet altitude 11.9° with Sun at -14.4°.) 2023 9 5.132 S 5.8 TK 5.0B 8 3 7 LOO Genk (Moonlight. Twilight. Comet altitude 10°.) 2023 9 4.121 S 6.2 TK 8.0B 15 5.7 8 0.9 298 DIJ Burlage (Moonlight. Comet altitude 13° with Sun at -14°.) 2023 8 31.17 S 6.4 TK 8.0B 20 3 6 0.4 290 GON Villacintor, León 2023 8 31.16 S 6.6 TK 20.3T 77 4 5/ 0.7 290 GON Villacintor, León (Moonlight interference. Altitude 14°.) 2023 8 31.114 S 6.9 TK 8.0B 15 & 4 7 DIJ Burlage (Moonlight. Comet altitude 12° with Sun at -15°.) 2023 8 29.77 B 7.2 TJ 40.0L 36 5.0 7 YOS Mt. Tsukuba, Ibaraki (Very strongly condensed, bright, and easy to see.) 2023 8 29.103 M 7.1 HI 8.0B 15 3 7 0.3 285 BOU Westerwijtwerd (Very faint gas tail visible. Comet altitude 10.5° with Sun at -17.1°.) 2023 8 28.126 S 7.5 TK 10.0B 14 3 6 LOO Genk (Twilight. Altitude comet 15°.) 2023 8 28.113 M 7.2 HI 8.0B 15 3.5 5/ BOU Westerwijtwerd (Comet altitude 12.6° with Sun at -15.3°.) 2023 8 27.17 S 7.3 TK 20.3T 77 5 5 0.4 280 GON Villacintor, León (Astronomical twilight. Altitude 16°.) 2023 8 27.104 S 7.2 TK 8.0B 15 6 7 DIJ Burlage (Comet altitude 11.5° with Sun at -16.7°.) 2023 8 27.092 S 7.3 TK 15.5L 29 4 6 DIJ Burlage (Comet altitude 9°.) 2023 8 26.132 S 7.8 TK 10.0B 14 2 7 LOO Genk (Twilight. Altitude comet 15°.) 2023 8 25.79 M 8.6 TK 40.0L 59 2.6 5/ WYA Walcha, NSW (Low altitude 5.0°. Zodiacal light and twilight interference. Coma enhances strongly in Swan Band filter. Ground fog/haze interference. Coma is pale aqua-blue in colour.) 2023 8 23.12 S 7.8 TK 20.0L 42 6 6 SCH Eerbeek (Altitude comet 13°, altitude Sun -14°. Some cirrusclouds.) 2023 8 23.103 S 7.9 TK 15.5L 50 3.4 6 DIJ Burlage (Comet altitude 11° with Sun at -15.2°.) 2023 8 22.36 S 8.0:TK 10.0B 20 2 3 GOI Araçatuba (Comet altitude 14°, nautical twilight with Sun at -12°.) 2023 8 22.16 S 7.6 TK 8.0B 20 6 4 GON Cueto Rosales, León (Altitude 12°.) 2023 8 22.15 S 7.8 TK 20.3T 77 5 5 0.3 270 GON Cueto Rosales, León 2023 8 21.79 M 8.9 TK 25.0L 40 3.5 5/ WYA Walcha, NSW (Low altitude 7.2°. Zodiacal light and twilight interference. Coma enhances strongly in Swan Band filter. Well condensed and opaque centre.) 2023 8 21.104 S 8.5 HI 25.4J 58 3.5 4/ BOU Westerwijtwerd (Comet altitude 10.4° with Sun at -14.8°.) 2023 8 20.097 S 8.3 TK 15.5L 50 4 4 DIJ Burlage (Comet altitude 9.1° with Sun at -15.5°.) 2023 8 19.110 S 8.5 TK 8.0B 15 4 3 DIJ Burlage (Comet altitude 11.8°, Sun at -13°.) 2023 8 14.16 S 9.3 TK 20.3T 77 4 3 GON Alto del Castro, León (Comet close to Nakano ephemeris position. Motion checked during a 45-min period. Beginning of astronomical twilight. Altitude 11°.)