C/2017 O1

C/2017 O1
Reported observations:
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. 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 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]