* * * * * C/2017 S3 (PANSTARRS) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2018 8 2.15 S 7.9 TK 20.3T 77 3.5 3/ GON Alto del Castro, León (Coma elongated in p.a. 320 deg. No observable central condensation. Motion obvious, followed for a 60-min period. Beginning of astronomical twilight. Moonlight interference [phase 0.76]. Comparison stars at the same low altitude [14°] as the comet. Limiting stellar magnitude fainter than 11.7 [TK].) 2018 7 22.08 S 8.1 TK 10.0B 25 6 5 GON Quintanilla de los Oteros, León 2018 7 22.07 S 8.5 TK 20.3T 77 4 4 GON Quintanilla de los Oteros, León (Fading from previous outburst. Altitude 20°.) 2018 7 22.059 S 9.8 TK 32.0L 57 2 4 LOO Genk 2018 7 19.048 S 7.8 TK 10.0B 25 3 6 LOO Genk 2018 7 18.977 M 7.6 TK 8.0B 15 5.5 5/ DIJ Burlage 2018 7 18.91 S 7.4 TK 8.0B 15 4 5 DeS Beert 2018 7 18.052 S 7.2 TK 10.0B 25 4 6 LOO Genk 2018 7 17.98 M 7.3 TK 5.0B 10 5 6/ GON Alto del Castro, León 2018 7 17.97 M 7.4 TK 10.0B 25 5 6 GON Alto del Castro, León 2018 7 17.964 M 7.4 TK 8.0B 15 4.5 5/ DIJ Burlage 2018 7 17.963 M 7.5 HI 8.0B 15 4 5/ BOU Sint Annen 2018 7 17.96 S 7.9 TK 20.3T 77 4.5 5/ 0.6 300 GON Alto del Castro, León (After new outburst. Faint ion tail.) 2018 7 17.92 S 7.6 TK 10.0B 25 4 5 DeS Beert 2018 7 16.972 M 7.7 TK 8.0B 15 6 6 DIJ Burlage 2018 7 16.965 M 7.5 HI 8.0B 15 4 5 BOU Sint Annen 2018 7 16.048 S 7.8 TK 10.0B 25 3 6 LOO Genk 2018 7 16.010 M 8.0 TK 5.0B 10 3.5 6 BOU Sint Annen 2018 7 16.003 M 8.2 TK 25.4J 47 3 6 BOU Sint Annen 2018 7 15.930 S 8.4 TK 15.5L 29 2.5 6 DIJ Burlage 2018 7 14.971 S 9.5 TK 15.5L 42 2.6 5/ DIJ Burlage (Outburst.) 2018 7 13.70 S 10.2 TJ 40.0L 75 3.5 3/ YOS Kita-karuizawa, Gunma (Bright. Well condensed, more than expected.) 2018 7 10.978 S 10.3 AQ 25.4J 47 3.5 0/ BOU Sint Annen (Some twilight. Comet very diffuse. Altitude 28°.) 2018 7 9.93 S 9.5 TK 20.3T 77 4.5 2 GON Alto del Castro, León (Altitude 15°.) 2018 7 7.99 S 10.0:TK 20.0L 42 & 4 0 SCH Eerbeek (Difficult observation. Several stars nearby. More diffuse than two nights ago.) 2018 7 7.976 S 9.9 TK 25.4J 47 3.5 1/ BOU Sint Annen (Twilight. Comet very diffuse. Star of magn. 11.4 [AQ] at edge of coma.) 2018 7 7.967 S 10.4 TA 15.5L 42 3.5 0/ DIJ Burlage 2018 7 6.986 S 9.7 TA 15.5L 42 2.5 1 DIJ Burlage 2018 7 5.99 S 9.6 TK 20.0L 42 & 3 1 SCH Eerbeek (Observation around moonrise.) 2018 7 5.972 S 10.3 TK 10.0B 25 2 3 LOO Genk 2018 7 4.963 S 9.1 TK 15.5L 42 4 4 DIJ Burlage 2018 7 3.95 S 9.0 TK 10.0B 25 5 3/ GON Villar del Yermo, León 2018 7 3.94 S 9.1 TK 20.3T 77 5 3 GON Villar del Yermo, León (In outburst.)