* * * * * 38P/Stephan-Oterma * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2019 4 23.92 V 16.6 TK 50.0L 0.4 QVA Nykirke 2019 3 10.88 V 14.8 TK 50.0L 0.7 QVA Nykirke (Moonlight.) 2019 2 27.892 M 13.3 AQ 30.5T 139 0.8 4/ BOU Burlage, Germany 2019 2 27.888 S 13.4 AQ 30.5T 139 1.1 2 DIJ Burlage 2019 2 24.92 S 11.5 AQ 20.3T 100 2 2/ GON Puerto de Aralla, León 2019 2 23.50 S 12.6 TA 40.0L 144 1.8 3 YOS Mt. Hanadate, Ibaraki (It became faint, but still visible well.) 2019 2 15.166 S 12.2 AQ 30.5T 102 1.5 3 BOU Burlage, Germany 2019 2 15.163 S 11.7 AQ 30.5T 102 2.5 2/ DIJ Burlage 2019 2 11.83 V 13.6 TK 50.0L 0.9 QVA Nykirke (Moonlight.) 2019 2 3.864 S 11.6 AQ 30.5T 73 1.8 4 BOU Burlage, Germany (Close to star of magn. 10.8.) 2019 2 3.862 S 11.8 AQ 30.5T 73 1.8 4 DIJ Burlage 2019 1 28.91 S 11.3 TK 35.6T 140 & 2 2 SCH Bussloo (Very faint and diffuse. Only visible using averted vision.) 2019 1 25.82 S 10.5 TK 20.3T 100 5 3 GON Villacintor, León (Mag. 12.4 [AQ] star in coma.) 2019 1 14.64 M 10.4 AQ 25.0L 39 5.0 3/ WYA Walcha, NSW (Coma faint and diffuse, opaque centre. Outer coma enhances in Swan Band filter, inner coma dims. Low altitude 13.9°.) 2019 1 14.08 S 10.3 TK 20.3T 77 4 3/ GON Alto del Castro - Aralla, León 2019 1 12.60 M 10.4 AQ 25.0L 39 5.5 4 WYA Walcha, NSW (Enhances slightly in Swan Band filter. Diffuse coma, moderately condensed centre. Low altitude 14.5°.) 2019 1 6.84 S 9.9 TK 20.3T 100 5 3/ 0.15 260 GON Alto del Castro - Aralla, León 2019 1 6.82 S 10.5 TJ 40.0L 75 3 6/ YOS Mt. Hanadate, Ibaraki (Strongly condensed.) 2019 1 4.87 S 9.9 TK 20.3T 77 5 3 0.15 260 GON Les Retuertes - Sierra del Aramo, Asturias 2019 1 1.85 S 9.9 TK 20.3T 100 5 3/ 0.15 260 GON Alto del Castro - Aralla, León 2018 12 31.62 S 10.1 TJ 40.0L 36 5 6/ YOS Mt. Hanadate, Ibaraki (The central condensation is very sharp.) 2018 12 30.66 M 10.0 TK 25.0L 39 4.5 3/ WYA Walcha, NSW (Moonlight. Low altitude 18.8°. Coma diffuse, opaque centre, transparent outer coma, enhances slightly in Swan band filter.) 2018 12 30.19 S 10.1 TK 22.0L 60 3.5 3 GOI Araçatuba 2018 12 29.84 S 9.7 TK 20.3T 100 6 3/ 0.15 260 GON Alto del Castro - Aralla, León 2018 12 14.23 S 9.5 TK 22.0L 60 5 3/ GOI Araçatuba (Very near a star of magn. 9.2.) 2018 12 14.05 S 10.2 TK 20.3T 77 4 3/ 0.2 270 GON Alto del Trichero - Soto y Amío, León 2018 12 12.174 S 10.7 TK 32.0L 160 1 4 LOO Genk 2018 12 9.25 S 9.5 TK 22.0L 60 5 3 GOI Araçatuba 2018 12 7.964 S 10.4 AQ 15.6L 36 3.5 3/ BOU Lauwersoog 2018 12 7.94 S 10.4 TK 20.0L 42 5 2 SCH Eerbeek (Only with averted vision.) 2018 12 7.923 S 9.9 TK 15.5L 42 5.8 3 DIJ Burlage 2018 12 7.14 S 9.4 TK 20.3T 77 5 3/ 0.2 260 GON Alto del Castro - Aralla, León 2018 12 1.75 S 10.5 TJ 40.0L 36 3.3 4 YOS Kita-karuizawa, Gunma 2018 12 1.042 S 9.9 TK 8.0B 15 7.8 2 DIJ Burlage 2018 11 30.910 M 10.2 AQ 15.6L 36 4.5 4 BOU Sint Annen 2018 11 30.62 S 9.8 TJ 40.0L 36 3.0 6 YOS Kita-karuizawa, Gunma (Strongly condensed and easy to see. It looks DC=7 with 75x magnification.) 2018 11 17.68 S 9.8 AA 10.0B 25 4 SEA Cowra, NSW 2018 11 17.21 S 9.6 TK 20.0L 42 & 5 2 SCH Eerbeek 2018 11 17.191 S 9.9 TK 15.6L 36 4 3/ BOU Sint Annen 2018 11 17.181 S 9.5 TK 15.5L 29 4 3 DIJ Burlage 2018 11 16.13 S 9.5 TK 20.3T 77 5 3 0.15 260 GON Collada del Fresno - Sierra del Aramo, Asturias (Several stars inside the coma, the brightest being mag. 11.3 [HS].) 2018 11 15.181 S 10.0 AQ 15.6L 36 4.5 3/ BOU Sint Annen (Star of magnitude 11.2 at edge of coma.) 2018 11 15.138 S 9.8 TK 15.5L 29 4.2 4 DIJ Burlage 2018 11 14.166 S 9.7 TK 15.5L 29 5 2/ DIJ Burlage 2018 11 13.910 S 10.0 AQ 25.4J 58 3.5 3/ BOU Sint Annen 2018 11 13.15 S 9.4 TK 20.3T 77 5 2/ GON Collada del Fresno - Sierra del Aramo, Asturias 2018 11 11.951 S 9.9 TK 15.5L 42 5 2 DIJ Burlage 2018 11 11.70 M 10.4 TK 25.0L 39 5.5 5/ WYA Walcha, NSW (Faint star in coma, very diffuse outer coma. Moderately condensed opaque centre.) 2018 11 11.21 S 9.3 TK 10.0B 20 5 2 GOI Araçatuba 2018 11 10.91 S 11.1 TT 40.0L 105 1 2/ FIL Jerzmanowice 2018 11 10.67 M 9.8 TK 25.0L 39 4 5/ WYA Walcha, NSW (Opaque centre, sometimes faintly stellar. Semi-transparent outer coma. Enhances in Swan Band filter. Close to star.) 2018 11 9.222 S 10.8 TK 32.0L 133 1 6 LOO Genk 2018 11 9.17 S 9.3 TK 20.3T 77 5 2/ GON Collada del Fresno - Sierra del Aramo, Asturias 2018 11 8.912 S 9.8 TK 15.5L 42 5 2/ DIJ Burlage 2018 11 5.17 S 9.7 TK 22.0L 60 3 3 GOI Araçatuba 2018 11 4.06 S 10.4 TK 20.0L 42 4 5 SCH Eerbeek 2018 11 4.00 S 9.0 TK 10.0B 25 6 3 GON Pandorado, León 2018 11 3.99 S 9.1 TK 20.3T 77 6 3 GON Pandorado, León 2018 11 3.983 S 9.9 TK 15.6L 36 4 3/ BOU Sint Annen 2018 11 3.962 S 10.1 AQ 15.5L 42 6 1 DIJ Burlage 2018 11 3.65 S 10.0 TJ 40.0L 36 6 3/ YOS Kita-karuizawa, Gunma (Bright and well visible.) 2018 11 3.017 S 9.9 TK 15.6L 36 3.5 3/ BOU Sint Annen 2018 11 2.896 S 10.2 AQ 15.5L 42 6 1 DIJ Burlage 2018 11 1.77 M 10.5 AQ 40.6L 76 3.5 3/ CAM Katherine, NT 2018 10 22.25 S 10.0 TK 22.0L 60 3 3 GOI Araçatuba (Moonlight, clouds.) 2018 10 20.09 S 9.8 TK 20.0L 42 4 4 SCH Eerbeek (Star of magn. 11.7 [AQ] near edge of coma.) 2018 10 16.08 S 9.1 TK 20.3T 77 7 2/ GON Alto del Castro, León 2018 10 15.044 S 10.7 AQ 15.5L 42 3 2/ DIJ Burlage 2018 10 13.31 S 10.1 TK 22.0L 60 3 4 GOI Araçatuba 2018 10 11.82 M 10.5 AQ 40.6L 76 2.8 3 CAM Katherine, NT 2018 10 11.13 S 11.5 TK 35.6T 98 1 6 SCH Bussloo (Comet in field with several weak stars.) 2018 10 9.981 S 10.6 AQ 15.5L 42 2.5 2 DIJ Burlage 2018 10 9.81 M 10.6 AQ 40.6L 76 2.6 3 CAM Katherine, NT 2018 10 8.138 S 10.5 AQ 15.5L 42 2.5 2/ DIJ Burlage 2018 10 7.82 M 10.6 AQ 40.6L 76 1.4 3/ CAM Katherine, NT 2018 10 7.71 S 11.4 TJ 40.0L 75 3.2 5/ YOS Kita-karuizawa, Gunma (Strongly condensed and easy to see.) 2018 10 6.82 M 10.6 AQ 40.6L 76 1.5 3/ CAM Katherine, NT 2018 10 6.77 S 10.9 TJ 40.0L 75 2.4 6 YOS Kita-karuizawa, Gunma 2018 10 6.23 S 10.5 AU 22.0L 60 3 3 GOI Araçatuba 2018 10 6.058 S 10.8 AQ 15.5L 42 3.2 2 DIJ Burlage 2018 10 4.82 M 11.2 AQ 40.6L 165 1.5 4 CAM Katherine, NT 2018 10 4.02 S 9.9 TK 20.3T 100 5 2/ GON Alto del Castro, León (Asymmetric coma. Altitude 20°.) 2018 10 3.81 M 11.2 AQ 40.6L 76 1.4 4/ CAM Katherine, NT 2018 9 29.81 M 11.4 AQ 40.6L 165 1.5 4 CAM Katherine, NT 2018 9 24.160 S 11.8 AQ 15.5L 42 2 3 DIJ Burlage 2018 9 22.83 M 11.8 AQ 40.6L 76 1.8 4 CAM Katherine, NT 2018 9 21.80 M 12.0 AQ 40.6L 76 1.8 4/ CAM Katherine, NT 2018 9 19.17 S 10.0 TK 20.3T 77 6 2 GON Aralla, León (Mag. 12.1 [AQ] star in coma.) 2018 9 19.085 S 11.8 AQ 25.4J 72 2.1 3 BOU Sint Annen 2018 9 18.81 M 12.0 AQ 40.6L 76 1.5 4 CAM Katherine, NT 2018 9 18.74 M 12.4 AQ 25.0L 83 1.8 6 WYA Walcha, NSW (Coma diffuse, close to bright star. Small stellar central condensation.) 2018 9 17.68 S 11.5 TA 40.0L 144 1.3 6 YOS Kita-karuizawa, Gunma (Very bright and easy to see. I'm glad that finally I can see this comet!) 2018 9 16.82 M 12.0 AQ 40.6L 76 1.3 4 CAM Katherine, NT 2018 9 16.69 S 11.4 TA 40.0L 75 2.3 4/ YOS Kita-karuizawa, Gunma 2018 9 14.83 M 12.4 AQ 40.6L 76 1.5 3 CAM Katherine, NT 2018 9 13.094 S 12.0 AQ 25.4J 88 1.7 2/ BOU Sint Annen 2018 9 11.83 M 12.2 AQ 40.6L 76 1.8 4 CAM Katherine, NT 2018 9 10.78 M 12.2 AQ 40.6L 76 1.8 4 CAM Katherine, NT 2018 9 10.17 S 9.9 TK 20.3T 77 5 2 GON Aralla, León (Mag. 11.3 [TK] star in coma.) 2018 9 6.82 M 12.5 AQ 40.6L 76 1.5 3/ CAM Katherine, NT 2018 9 5.83 M 12.7 AQ 40.6L 76 1.5 3 CAM Katherine, NT 2018 8 20.15 S 10.5 TK 20.3T 77 5 2/ GON Alto del Castro, León 2018 8 18.76 M 12.9 AQ 25.0L 83 1.5 4 WYA Walcha, NSW (Diffuse, moderately condensed semi-opaque centre. Does not appear to enhance in Swan Band filter.) 2018 8 15.76 S 13.1 AQ 25.0L 83 1.6 2/ WYA Walcha, NSW (Very diffuse, slight brightening to centre.) 2018 8 15.17 S 10.9 TK 20.3T 100 3 2/ GON Alto del Castro, León (Brighter than expected. Astronomical twilight. Motion followed for a 75-min period.) 2018 8 13.80 S 13.8 AQ 40.6L 165 1.0 3 CAM Katherine, NT 2018 8 12.82 M 13.6 AQ 40.6L 165 1.0 4 CAM Katherine, NT 2018 8 10.83 S 14.0 AQ 40.6L 266 1.0 3 CAM Katherine, NT 2018 8 10.17 S 11.5 TK 20.3T 133 2.5 3 GON Alto del Castro, León 2018 8 9.83 S 14.2 AQ 40.6L 266 1.0 3 CAM Katherine, NT 2018 8 8.76 S 14.1 AQ 25.0L 83 1.2 3 WYA Walcha, NSW (Difficult. Diffuse coma, slightly brighter in centre.)