73P/Schwassmann-Wachmann 3

73P/Schwassmann-Wachmann 3
Reported observations:
2017 Apr. 05.76 UT: m1=12.3, Dia.=2.2’, DC=5, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Short tail visible 2’ in length in P.A. 260° approximately; Zodiacal light interference. Altitude= 15.6°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 Apr. 01.86 UT: m1=11.9, Dia.=1.2', DC=3, ... 20-cm f/4 L (100x) ...  Andrew Pearce (Bailup, W. Australia)
2017 Mar. 31.86 UT: m1=11.6, Dia.=2', DC=3, ... 20-cm f/4 L (100x) ... Andrew Pearce (Bailup, W. Australia)
2017 Mar. 30.35 UT: m1=12.0, Dia.=1', DC=4/, ... 22-cm L (160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilght]
2017 Mar. 27.75 UT: m1= 11.9, Dia.=0.7’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Very faint short tail visible, 1.8’ in length in P.A. 267° approximately. Inner coma opaque with faint stellar central condensation. Zodiacal light interference and low altitude = 15.3°. *Total light combined from components 73P and 73P-bt. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 Mar. 24.86 UT: m1=11.5, Dia.=1.5', DC=3, ... 20-cm f/4 L (100x) ... Andrew Pearce (Bailup, W. Australia)
2017 Mar. 03.83 UT: m1=[10.5, ... 40.0-cm L f/4.5 (144x) ...Seiichi Yoshida (Ibaraki, Japan)
2017 Feb. 17.72 UT: m1=10.8, Dia.=1’, DC=2/3 ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Moonlight. Coma small, diffuse and opaque. Slight brightening to centre, no enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Feb. 06.84 UT: m1=[12.2; 40.0-cm L f/4.5 (144x); Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 28.17 UT: m1=13.4, Dia.=0.6′, DC=4... 33-cm L (182x)... Piotr Guzik (Koskowa Góra, Poland, Alt. 800 m, 49º 45′ N, 19º 47′ E) [Sidgwick method. APASS comparison stars. Comet faint but small and condensed. Limiting stellar magnitude in comets vicinity ~15.2 mag. Motion checked over 20 minutes. SQM: 20.9 at zenith]
2017 Jan. 24.84 UT: m1=13.7, Dia.=0.6′, DC=2... 40.0-cm L f/4.5 (257x)... Seiichi Yoshida (Ibaraki, Japan)
2017 Jan. 07.25 UT: m1=11.4, Dia.=2.5′, DC=2... 20-cm SCT (133x)... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54′ N, 5º 48′ W) [Sidgwick method. APASS comparison stars. SQM: 21.4 at zenith. Faint and diffuse outer coma. Zodiacal light. Field stars checked in DSS. Mountain location, very clear sky]
2000 Dec. 23.85 UT: m1=9.9, Dia.=1.5', DC=3/... 25.4-cm T f/6.3 (116x)... Seiichi Yoshida (Ibaraki, Japan) [extremely low and hard to see]
2000 Dec. 05.84 UT: m1=10.3, Dia.=2.2', DC=4/... 25.4-cm T f/6.3 (116x)... Seiichi Yoshida (Ibaraki, Japan)
2000 Dec. 04.52 UT: m1=11.6, Dia.=0.7', DC=5/... 41-cm L... Alan Hale (Cloudcroft, New Mexico) [component C. Components B and E both searched for, but nothing convincing seen; for both components, m1 [13.0 ]
2000 Nov. 28.84 UT: m1=11.4, Dia.=2.6', DC=4... 25.4-cm T f/6.3 (116x)... Seiichi Yoshida (Ibaraki, Japan)
2000 Nov. 25.51 UT: m1=11.9:, Dia.=1', DC=3... 20-cm L... Alan Hale (Cloudcroft, New Mexico) [difficult object at low altitude, with significant interference from zodiacal light; the comet is probably a bit brighter than this estimate. This observation confirms a suspect briefly observed two mornings earlier]
2000 Nov. 23.83 UT: m1=10.4, Dia.=2.1', DC=6... 25.4-cm T f/6.3 (116x)... Seiichi Yoshida (Ibaraki, Japan)
Advertisements