C/2017 O1 (ASASSN)

C/2017 O1 (ASASSN)
Reported observations:
2017 Oct. 20.09 UT: m1=9.9, Dia.=5', DC=2/, ... 13-cm L (65x) ... Alexsandr Morozov (Novozybkov, Russia) (Lm=6.14)
2017 Oct. 14.00 UT: m1=8.3, Dia.=7', DC=2/, ... 25x100 B ... Juan Jose Gonzalez (Alto del Castro - Aralla, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [In 20 cm SCT (77x) : m1=8.5, Dia.=7', DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Oct. 10.90 UT: m1=8.3, Dia.=7', DC=3, ... 25x100 B ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1490 m, 42º 54' N, 5º 48' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 Oct. 03.19 UT: m1=8.1, Dia.=11', DC=3, ... 10x50 B ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1490 m, 42º 54' N, 5º 48' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Oct. 03.05 UT: m1=9.4, Dia.=7', DC=3, ... 13-cm L (26x) ... Alexsandr Morozov (Novozybkov, Russia) (S - Sidgwick`s method, Lm=6.45)
2017 Oct. 02.01 UT: m1=9.2, Dia.=9.3', DC=3/, ... 25-cm L (70x) ... Danil Sidorko (Korenovsk, Russia) [SQM= 21.10]
2017 Oct. 01.29 UT: m1=9.5, Dia.=5', DC=2/, ... 22-cm L (60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Sep. 27.63 UT: m1=9.5, Dia.=6.7’, DC=3, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances slightly in Swan Band filter. Coma diffuse with semi-transparent outer coma, opaque inner coma. Slight interference from faint stars in coma. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= S; Cat= TK]
2017 Sep. 25.69 UT: m1=9.5, Dia.=8', DC=2, ... 40.0-cm L f/4.5 (36x) ... Seiichi Yoshida (Gunma, Japan)
2017 Sep. 25.01 UT: m1=8.3, Dia.=10', DC=3, ... 10x50 B ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1490 m, 42º 54' N, 5º 48' W) [In 25x100B : m1=8.5, Dia.=9', DC=2/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Sep. 21.93 UT: m1=9.4, Dia.=4', DC=2/, ... 13-cm L (65x) ... Alexsandr Morozov (Novozybkov, Russia)(S - Sidgwick`s method, Lm=5.95)
2017 Sep. 21.73 UT: m1=9.5, Dia.=11.4’, DC=3/4, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma semi-transparent, inner coma opaque and moderately condensed. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2017 Sep. 18.95 UT: m1=9.0, Dia.=5', DC=3, ... 13-cm L (65x) ... Alexsandr Morozov (Novozybkov, Russia) (S - Sidgwick`s method)
2017 Sep. 16.01 UT: m1=8.2, Dia.=9', DC=3, ... 10x50 B ... Juan Jose Gonzalez (Cruce de Aralla - Embalse de Barrios de Luna, Leon, Spain; Alt. 1110 m, 42º 54' N, 5º 52' W) [In 25x100B : m1=8.3, Dia.=9', DC=2/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2017 Sep. 15.21 UT: m1=9.3, Dia.=5', DC=3/, ... 22-cm L (60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Sep. 03.002 UT: m1=9.6, Dia.=3.5', DC=3, ... 25-cm L (150x) ... Danil Sidorko (Korenovsk, Russia) [SQM = 21.65]
2017 Sep. 01.75 UT: m1=10.0, Dia.=6.4’, DC=3/4, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma opaque in centre, gradually fades to edges, pale aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2017 Sep. 01.09 UT: m1=8.6, Dia.=8', DC=3, ... 25x100 B ... Juan Jose Gonzalez (Alcuetas - Villabraz, Leon, Spain; Alt. 885 m, 42º 16' N, 5º 27' W) [In 20 cm SCT (77x) : m1=9.1, Dia.=6', DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Sep. 01.01 UT: m1=10.0, Dia.=3', DC=2/, ... 13-cm L (65x) ... Alexsandr Morozov (Novozybkov, Russia)
2017 Aug. 30.71 UT: m1=9.9, Dia.=5.8’, DC=4, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter, diffuse coma with opaque centre. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2017 Aug. 30.04 UT: m1=9.4, Dia.=5', DC=3, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
2017 Aug. 29.08 UT: m1=9.5, Dia.=5', DC=3, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
2017 Aug. 25.62: UT: m1=9.6:, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Somewhat enhanced using Swan Band filter]
2017 Aug. 25.15 UT: m1=8.7, Dia.=8', DC=3, ... 25x100 B ... Juan Jose Gonzalez (Puerto del Pando - Prioro, Leon, Spain; Alt. 1430 m, 42º 56' N, 4º 57' W) [In 20-cm SCT (77x) : m1=9.0, Dia.=6', DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.4]
2017 Aug. 22.21 UT: m1=9.9, Dia.=4', DC=4, ... 22-cm L (60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Aug. 21.11 UT: m1=8.8, Dia.=7', DC=3, ... 25x100 B ... Juan Jose Gonzalez (Alto del Castro - Aralla, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [In 20-cm SCT (77x): m1=9.0, Dia.=6', DC=3/. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2017 Aug. 19.72 UT: m1=9.5, Dia.=6’, DC=4, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, opaque centre, moderately condensed. Enhances well in Swan Band filter, pale aqua-blue in colour. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2017 Aug. 19.01 UT: m1=10.7, Dia.=2.5', DC=s4, ... 0.60-m L (184x) ... Gabor Santa (Hungary) [m2=15:, Huge coma with dim nucleus]
2017 Aug. 17.67 UT: m1=9.9, Dia.=5.5’, DC=3/4, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances strongly in Swan Band filter. Inner coma opaque, moderately condensed. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2017 Aug. 17.03 UT: m1=9.1, Dia.=5', DC=3/, ... 20-cm SCT (77x) ... (Alto del Castro - Aralla, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [Before moonrise. Altitude: 11 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2017 Aug. 01.74 UT: m1=9.8, Dia.=7.5’, DC=5/6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter; Outer coma semi-transparent, inner coma diffuse and opaque with a faint stellar centre visible in good seeing.Comparison stars checked using Tycho-2 data in Guide 9.0; Method= M; Cat= TK]
2017 Aug. 01.71 UT: m1=9.6, Dia.=10', DC=2, ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Moderately enhanced using Swan Band filter]
2017 Aug. 01.23 UT: m1=10.1, Dia.=4', DC=3, ... 22-cm L (60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Slight enhancement with Swan band filter]
2017 Aug. 01.06 UT: m1=10.3, Dia.=5', DC=3, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
2017 July 30.12 UT: m1=10.1, Dia=11', DC=2, no tail, ... 20-cm SCT (50x) ... Carlos Labordena (Castellón, España)
2017 July 25.77 UT: m1=9.9, Dia.=9.6’, DC=3, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma large and diffuse, enhances in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= S; Cat= TK]
2017 July 24.75 UT: m1=10.0, Dia.=7’, DC=3, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma large, enhances well in Swan Band filter. Comparison stars checked using Tycho-2 data in Guide 9.0; Method= S; Cat= TK]
2017 July 23.13 UT: m1=9.8, Dia.=5', DC=2/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro - Aralla, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [Brighter than expected. Diffuse object with faint outer coma. Field stars checked in DSS. Altitude: 17 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
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