C/2017 E1 (Borisov)

C/2017 E1 (Borisov)
Reported observations:
2017 Apr. 30.35 UT: m1=10.9, Dia.=2', DC=4, ... 22-cm L (160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2017 Apr. 28.79 UT: m1=11.0, Dia.=1.3’, DC=4, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to bright star, slight interference. Outer coma diffuse with a brighter moderately condensed inner coma. Zodiacal light interference. Low altitude = 17.0°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 Apr. 07.19 UT: m1=7.9, Dia.=6', DC=2, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m,  42º 54' N, 5º 48' W) [Sidgwick method. Tycho-2 comparison stars. Altitude: 6 deg. A hint of tail was observable. Astronomical twilight. Mountain location, very clear sky down to the horizon]
2017 Apr. 05.77 UT: m1=10.9, Dia.=3’, DC=5/6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, faint stellar central condensation in good seeing, slight zodiacal light interference. Altitude= 18.1°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 Apr. 04.19 UT: m1=8.5, Dia.=5', DC=2, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m,  42º 54' N, 5º 48' W) [Sidgwick method. Tycho-2 comparison stars. Altitude: 6 deg. Astronomical twilight. Mountain location, very clear sky]
2017 Apr. 01.85 UT: m1=11.2, Dia.=2.4', DC=3, ... 20-cm f/4 L (45x) ... Andrew Pearce (Bailup, W. Australia) 
2017 Apr. 01.19 UT: m1=8.8, Dia.=4', DC=2/, ... 25x100 B ... Juan Jose Gonzalez (Candanedo de Fenar, Leon, Spain; Alt. 1060 m, 42º 49' N, 5º 34' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.4 at zenith. Altitude: 6 deg. Mountain location, very clear sky]
2017 Mar. 31.86 UT: m1=11.0, Dia.=2.2', DC=3, ...20cm f/4 L (45x) ... Andrew Pearce (Bailup, W. Australia) 
2017 Mar. 29.35 UT: m1=11.4, Dia.=2.5', DC=4, ... 22-cm L (160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilght]
2017 Mar. 28.20 UT: m1=9.2, Dia.=5', DC=2, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Collado del Fresno, Asturias, Spain; Alt. 1280 m, 43º 10' N, 5º  54' W) [Sidgwick method. Tycho-2 comparison stars. Altitude: 9 deg. Beginning of astronomical twilight. Mountain location, very clear sky]
2017 Mar. 27.74 UT: m1=11.0, Dia.=1.5’, DC=3/4, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter; Slight zodiacal light interference. Low altitude = 13.5°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ] 
2017 Mar. 20.20 UT: m1=9.7, Dia.=3', DC=2, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain; Alt. 1530 m, 42º 54' N, 5º 48' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8 at zenith. Altitude: 10 deg. Field stars checked in DSS. Background star of mag 12.4 (GSC) in coma. Some moonlight interference (phase 0.54). Mountain location, very clear sky]
2017 Mar. 09.20 UT: m1=11.2, Dia.=2.5', DC=2, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Cea, Leon, Spain; Alt. 880 m, 42º 28' N, 5º  0' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.3 at zenith. Faint and diffuse outer coma. Altitude: 12 deg. Field stars checked in DSS. Rural dark sky location, clear sky]
2017 Mar. 05.49 UT: m1=13.1:, Dia.=1.6’, DC=1-2, ... 41-cm L (70x) ... Alan Hale (Cloudcroft, New Mexico, USA) [Vague and diffuse; motion obvious within a few minutes in the rich star field]