* * * * * C/2017 O1 (ASASSN) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2018 1 17.83 S 11.5 AQ 20.3T 100 3 2 GON Puerto de Aralla, León 2018 1 14.952 S 12.6 AQ 30.5T 139 1.2 1/ BOU Burlage, Germany 2018 1 14.949 S 12.7 AQ 30.5T 139 1.3 1/ DIJ Burlage 2017 12 19.44 S 13.6 TA 40.0L 257 0.7 1 YOS Mt. Hanadate, Ibaraki (It became very faint.) 2017 12 18.74 S 13.2 TA 40.0L 144 1.0 1 YOS Mt. Hanadate, Ibaraki 2017 12 5.77 S 10.0 TK 20.3T 77 4 1/ GON Candanedo de Fenar, León 2017 11 26.14 S 10.0 TK 20.3T 77 5 2 GON Puerto de Aralla, León 2017 11 24.80 S 11.5 TJ 40.0L 75 1.6 2 YOS Kita-karuizawa, Gunma (It became very faint and small. It is located near Polaris and it is observable all night.) 2017 11 22.938 S 10.4 AQ 25.4J 47 4 1/ BOU Sint Annen 2017 11 17.007 S 10.5 AQ 30.5T 54 2.1 0 DIJ Burlage 2017 11 17.005 S 10.2 AQ 30.5T 54 4 0/ BOU Burlage, Germany (Becoming very diffuse. Some interference from magn. 7.4 [TK] star, about 5' away.) 2017 11 16.25 S 9.8 TK 20.3T 77 5 2/ GON Puerto de Aralla, León 2017 11 14.23 S 9.6 TK 20.3T 77 5 2/ GON Puerto de Aralla, León 2017 11 13.79 S 8.9 TK 10.0B 25 5 2 GON Puerto de Aralla, León 2017 11 12.938 S 10.8 TK 15.5L 42 4 0 DIJ Burlage 2017 11 6.757 S 10.4 TK 15.5L 42 4.5 0 DIJ Burlage 2017 11 6.75 S 8.6 TK 10.0B 25 7 2/ GON Cruce de Aralla - Embalse de Barrios de Luna, León 2017 10 26.64 S 9.9 TJ 40.0L 36 5 1 YOS Kita-karuizawa, Gunma (Extremely diffuse and hard to see.) 2017 10 25.864 S 9.3 TK 15.6L 24 7 1/ BOU Sint Annen 2017 10 25.847 S 9.6 TK 15.5L 29 5.8 2 DIJ Burlage 2017 10 22.90 S 8.3 TK 10.0B 25 8 2/ GON Alto del Castro - Aralla, León 2017 10 21.916 S 9.5 TK 25.4J 47 6 2/ BOU Sint Annen 2017 10 21.875 S 9.6 TK 15.5L 29 6.2 2/ DIJ Burlage 2017 10 15.908 S 9.7 TK 25.4J 47 6 2/ BOU Sint Annen 2017 10 15.901 S 9.3 TK 8.0B 15 8.5 1/ BOU Sint Annen 2017 10 15.899 S 9.7 TK 15.5L 42 5.5 2 DIJ Burlage 2017 10 15.83 S 9.2 TK 20.0L 42 & 7 1 SCH Eerbeek (Faint, diffuse comet.) 2017 10 14.803 S 9.8 TK 15.5L 42 4.7 1/ DIJ Burlage 2017 10 14.00 S 8.3 TK 10.0B 25 7 2/ GON Alto del Castro - Aralla, León 2017 10 13.90 S 8.5 TK 20.3T 77 7 3 GON Alto del Castro - Aralla, León 2017 10 10.90 S 8.3 TK 10.0B 25 7 3 GON Puerto de Aralla, León 2017 10 3.19 S 8.1 TK 5.0B 10 11 3 GON Puerto de Aralla, León 2017 10 3.123 S 9.5 TK 15.5L 29 5 3 DIJ Burlage 2017 10 1.29 S 9.5 TK 22.0L 60 5 2/ GOI Araçatuba 2017 9 27.965 S 9.7 TK 15.5L 42 4 2 DIJ Burlage 2017 9 27.63 S 9.5 TK 25.0L 39 6.7 3 WYA Walcha, NSW (Enhances slightly in Swan Band filter. Coma diffuse with semi-transparent outer coma, opaque inner coma. Slight interference from faint stars in coma.) 2017 9 25.69 S 9.5 TJ 40.0L 36 8 2 YOS Kita-karuizawa, Gunma (Bright. But unexpectedly, diffuse with very weak condensation.) 2017 9 25.01 S 8.3 TK 5.0B 10 10 3 GON Puerto de Aralla, León (The visual lightcurve seems to show a slowdown in the recent weeks.) 2017 9 25.00 S 8.5 TK 10.0B 25 9 2/ GON Puerto de Aralla, León 2017 9 24.930 S 9.6 TK 15.5L 42 5 2/ DIJ Burlage 2017 9 23.939 S 9.6 TK 25.4J 47 5.5 2/ BOU Sint Annen 2017 9 23.93 S 9.7 TK 20.0L 42 & 5 1 SCH Eerbeek (Faint, diffuse comet.) 2017 9 21.73 M 9.5 TK 25.0L 39 11.4 3/ WYA Walcha, NSW (Outer coma semi-transparent, inner coma opaque and moderately condensed.) 2017 9 17.12 S 9.5 TK 12.5B 30 3 1 DeS Beert 2017 9 16.958 S 9.8 TK 15.5L 36 4.5 2 DIJ Burlage 2017 9 16.956 S 9.5 TK 15.5L 36 6 2/ BOU Burlage, Germany 2017 9 16.01 S 8.2 TK 5.0B 10 9 3 GON Cruce de Aralla - Embalse de Barrios de Luna, León 2017 9 16.00 S 8.3 TK 10.0B 25 9 2/ GON Cruce de Aralla - Embalse de Barrios de Luna, León 2017 9 15.944 S 9.8 TK 15.5L 42 5 2 DIJ Burlage 2017 9 15.21 S 9.3 TK 22.0L 60 5 3/ GOI Araçatuba 2017 9 13.964 S 9.6 TK 15.5L 29 6 2/ DIJ Burlage 2017 9 3.067 S 9.7 TA 15.6L 36 5.5 3 BOU Sint Annen 2017 9 1.75 M 10.0 TK 25.0L 39 6.4 3/ WYA Walcha, NSW (Coma opaque in centre, gradually fades to edges, pale aqua-blue in colour.) 2017 9 1.09 S 8.6 TK 10.0B 25 8 3 GON Alcuetas - Villabraz, León 2017 9 1.08 S 9.1 TK 20.3T 77 6 3/ GON Alcuetas - Villabraz, León 2017 9 1.031 S 9.4 TA 15.5L 36 6.5 2/ DIJ Burlage 2017 9 1.031 S 9.5 TA 15.5L 36 5.5 2/ BOU Burlage, Germany (Fairly large, diffuse object. Star of magn. 11.4 [AQ] near edge inside coma.) 2017 8 30.71 M 9.9 TK 25.0L 39 5.8 4 WYA Walcha, NSW (Enhances in Swan Band filter. Diffuse coma with opaque centre.) 2017 8 25.62 S 9.6 AA 10.0B 25 SEA Cowra, NSW (Somewhat enhanced using Swan Band filter.) 2017 8 25.15 S 8.7 TK 10.0B 25 8 3 GON Puerto del Pando - Prioro, León 2017 8 25.14 S 9.0 TK 20.3T 77 6 3 GON Puerto del Pando - Prioro, León 2017 8 23.075 S 9.5 TK 25.4J 47 5 2/ BOU Sint Annen 2017 8 23.033 S 9.6 TK 15.5L 60 4 2 DIJ Burlage 2017 8 22.21 S 9.9 TK 22.0L 60 4 4 GOI Araçatuba 2017 8 22.038 S 9.8 TK 15.5L 42 5 3/ DIJ Burlage 2017 8 21.11 S 8.8 TK 10.0B 25 7 3 GON Alto del Castro - Aralla, León 2017 8 21.10 S 9.0 TK 20.3T 77 6 3/ GON Alto del Castro - Aralla, León 2017 8 19.72 M 9.5 TK 25.0L 39 6 4 WYA Walcha, NSW (Coma large and diffuse, opaque centre, moderately condensed. Enhances well in Swan Band filter. Pale aqua-blue in colour.) 2017 8 17.67 M 9.9 TK 25.0L 39 5.5 3/ WYA Walcha, NSW (Enhances strongly in Swan Band filter. Inner coma opaque, moderately condensed.) 2017 8 17.03 S 9.1 TK 20.3T 77 5 3/ GON Alto del Castro - Aralla, León (Before moonrise. Altitude 11°.) 2017 8 1.81 S 9.7 TK 8.0R 36 10 2 CAM Katherine, NT (Enhanced in Swan Band filter.) 2017 8 1.74 M 9.8 TK 25.0L 39 7.5 5/ WYA Walcha, NSW (Enhances in Swan Band filter. Outer coma semi-transparent, inner coma diffuse and opaque with a faint stellar centre visible in good seeing.) 2017 8 1.71 S 9.6 AA 10.0B 25 10 2 SEA Cowra, NSW (Moderately enhanced using Swan Band filter.) 2017 8 1.23 S 10.1 TK 22.0L 60 4 3 GOI Araçatuba (Slight enhancement with Swan band filter.) 2017 7 30.80 S 10.4 AQ 40.6L 76 6 3 CAM Katherine, NT (Enhanced in Swan Band filter. At 165x, moderate star like DC.) 2017 7 27.79 S 11.0 AQ 40.6L 76 5 1/ CAM Katherine, NT (Close to a 12th magn. star. Enhanced in Swan Band filter.) 2017 7 26.83 S 10.2 AQ 8.0B 20 6 1/ CAM Katherine, NT 2017 7 25.77 S 9.9 TK 25.0L 39 9.6 3 WYA Walcha, NSW (Coma large and diffuse, enhances in Swan Band filter.) 2017 7 24.80 S 10.8 AQ 40.6L 76 5 2 CAM Katherine, NT 2017 7 24.75 S 10.0 TK 25.0L 39 7 3 WYA Walcha, NSW (Coma large, enhances well in Swan Band filter.) 2017 7 23.13 S 9.8 TK 20.3T 77 5 2/ GON Alto del Castro - Aralla, León (In good agreement with the PCCP ephemeris position. Brighter than expected. Diffuse object with faint outer coma. Field stars checked in DSS. Altitude 17°.) 2017 7 22.80 S 10.8 AQ 40.6L 76 4 2 CAM Katherine, NT