C/2016 M1 (PANSTARRS)

C/2016 M1 (PANSTARRS)
Reported observations:
2018 May  25.72 UT: m1=9.6:, Dia.=2.9’, DC=5, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain due to interference by mag 10.2 star near centre of coma. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  25.28 UT: m1=9.4, Dia.=2.4’, DC=4, ... 25-cm L f:4.5 (75x) ... Gonzalo Vargas (Cochabamba, Bolivia) [Se observó ligera coloración verde agua de la coma, se experimentó alguna interferencia de luz de la Luna, se usaron las estrellas SAO 188147 (8.6) y GSC 63051137 (9.6) para estimar magnitud del cometa, se usó método de desenfoque]
2018 May  22.72 UT: m1=9.6, Dia.=4.2’, DC=5/6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, pale-aqua blue opaque centre. Coma enhances in Swan Band filter, inner coma dims. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  21.72 UT: m1=10.0, Dia.=5’, DC=5/6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to stars, centre opaque, faintly stellar. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  21.07 UT: m1=8.9, Dia.=5', DC=3/, ... 25x100 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [In 20-cm SCT (77x) : m1=9.1, Dia.=5', DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 May  20.31 UT: m1=9.7, Dia.=4', DC=4/, ... 22-cm L (60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 May  20.09 UT: m1=9.6, Dia.=4', DC=4, no tail, ... 20-cm SCT(50x) ... Carlos Labordena (Castellón, España)
2018 May  19.72 UT: m1=10.2, Dia.=4.7’, DC=6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Semi-transparent outer coma, inner coma opaque with faint stellar central condensation. Outer coma enhances in Swan Band filter, inner coma disappears making the coma appear more uniform in brightness. Hint of dust tail within the coma extending to NW approximately. Comparison stars checked Tycho-2 Guide 9.0; Method= M; Cat= TK]
2018 May  18.73 UT: m1=10.2, Dia.=3.5’, DC=5, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to nearby stars; Coma diffuse, slightly elongated to WSW approximately. Enhances in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 May  18.46 UT: m1=9.6, Dia.=3', DC=4, ... 30x125 B ... Carl Hergenrother (Tucson, AZ, USA)
2018 May  16.02 UT: m1=9.0, Dia.=4', DC=3, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47' N, 6º 00' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2018 May  15.46 UT: m1=9.6, Dia.=4', DC=5, ... 30x125 B ... Carl Hergenrother (Tucson, AZ, USA)
2018 May  15.24 UT: m1=9.8, Dia.=2.5’, DC=4, ... 25-cm L f:4.5 (75x) ... Gonzalo Vargas (Cochabamba, Bolivia) [Se nota coloración azulada de la coma, también se aprecia un ligero alargamiento de la coma al oeste, se usaron estrellas SAO 162817 (9.3) y GSC 5735817(10.8) para estimar magnitud del cometa]
2018 May  13.14 UT: m1=9.6, Dia.=4', DC=4, no tail, ... 20-cm SCT(50x) ... Carlos Labordena (Castellón, España)
2018 May  12.46 UT: m1=9.9:, Dia.=4', DC=5, ... 30x125 B ... Carl Hergenrother (Tucson, AZ, USA)
2018 May  10.62 UT; m1=10.0, Dia=3.2’, DC=6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma enhances in Swan Band filter, inner coma dims. Coma elongated to the West approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ}
2018 May  09.59 UT: m1=10.1, Dia.=4.7’, DC= 6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Transparent outer coma enhances in Swan band filter while the faintly stellar and opaque central condensation dims. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 May  09.17 UT: m1=10.6, Dia.=2.5', DC=3, ... 22-cm L (60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [little enhancement with comet filter ]
2018 May  09.09 UT: m1=9.3, Dia.=5', DC=3, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47' N, 6º 00' W) [Sidgwick method. Tycho-2 comparison stars. SQM : 20.7. Before moonrise. Altitude: 24 deg.]
2018 May  08.00 UT: m1=10.4, Dia.=1', DC=3, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia)
2018 May  03.76 UT: m1=10.5, Dia.=1.7', DC=4, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan)
2018 Apr. 22.27 UT: m1=10.8, Dia.=2', DC=4, ... 22-cm L (160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Apr. 20.69 UT: m1=10.5, Dia.=3.8’, DC=5/6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma enhances slightly in Swan Band filter; Central condensation sometimes appears stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 20.09 UT: m1=10.5, Dia.=5.5', DC=3/, ... 20-cm L f:4 (42x) ... Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 19.09 UT: m1=9.9, Dia.=4', DC=3, ... 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. SQM: 21.0]
2018 Apr. 19.08 UT: m1=10.5, Dia.=5.5', DC=3, ... 20-cm L f:4 (42x) ... Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr. 18.08 UT: m1=10.6, Dia.=5.0', DC=3/, ... 20-cm L f:4 (42x) ... Martin Lehky (Hradec Králové, Czech Republic)
2018 Apr.  17.14 UT: m1=10.8, Dia.=2.5', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2018 Apr. 16.73 UT: m1=11.2, Dia.=2.2’, DC=5/6, .. 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma does not appear to enhance in Swan Band filter; Diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 15.71 UT: m1=11.4, Dia.=2.7’, DC=5/6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter; Opaque centre, moderately condensed, hints of stellaring in periods of good seeing, outer coma diffused and appears fanned to the North. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 14.67 UT: m1=11.6, Dia.=2’, DC=4/5, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter, Inner coma opaque, moderately condensed, no tail. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Apr. 11.66 UT: m1=11.3, Dia.=2.3’, DC=4, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, Inner coma opaque and moderately condensed. Does not appear to enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Mar. 27.17 UT: m1=11.1, Dia.=1.5', DC=3, no tail, ... 20-cm SCT(80x) ... Carlos Labordena (Castellón, España)
2018 Mar. 24.70 UT: m1=12.0, Dia.=1.3’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Interference from background stars, diffuse coma with opaque centre. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 Mar. 24.33 UT: m1=11.3, Dia.=1.5', DC=3, ... 22-cm L (160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [near star with m1:11.47]
2018 Mar. 18.72 UT: m1=11.8; Dia.=1.3’, DC=5/6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter, coma diffuse with a small and opaque centre that is sometimes stellar in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 Feb. 21.23 UT: m1=11.0, Dia.=3', DC=2/, ... 20-cm SCT (133x) ... Juan Jose Gonzalez (Villacintor, Leon, Spain; Alt. 930 m, 42º 29' N, 5º 11' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1. Altitude: 24 deg.]
2017 Nov. 14.75 UT: m1=14.0, Dia.=0.5', DC=3, ... 60-cm L (244x) ... Sandor Szabo (Hungary) [Very close to a 13.9 mag star, but easily seen]
2017 Nov. 14.70 UT: m1=13.7, Dia.=0.6', DC=d4-5, ... 0.40-m L f/4.4 (360x) ... Gabor Santa (Göd, Hungary) [comet is easy to see, round, with disk-like condensation. 32 deg above horizon, nelm=5.0]
2017 Oct. 26.40 UT: m1=[13.9, ... 40.0-cm L f/4.5 (257x) ... Seiichi Yoshida (Gunma, Japan)
2017 Oct. 13.77 UT: m1=14.0, Dia.=0.5', DC=3-4, ... 0.40-m Dobsonian f/4.4 (257x) ... Gabor Santa (relatively big and diffuse, difficult to see Hungary) [easy to see]
2017 Sep. 22.82 UT: m1=14.5, Dia.=0.5’, DC=5, ... 60-cm reflector (305x) ... Sandor Szabo (Sopron, Hungary)
2017 Aug. 21.83 UT: m1=14.8, Dia.=0.33', DC=0, ... 0.35-m L (351x) ... Gabor Santa (Hungary) [Coma is diffuse but very obvious]
2017 Apr. 20.00 UT: m1=16.7 CCD, Dia.=0.20', DC=7/, ... 0.25-m f/4.7 reflector + CCD ... Sergey Shurpakov (Observatory C36, Baran', Belarus)
2017 Apr. 04.99 UT: m1=16.8 CCD, Dia.=0.37', DC=7/, ... 0.25-m f/4.7 reflector + CCD ... Serguey Shurpakov (Observatory C36, Baran', Belarus)
2017 Mar. 16.99 UT: m1=16.8 CCD, Dia.=0.28', DC=8, ... 0.25-m f/4.7 reflector + CCD ... S. Shurpakov (Observatory C36, Baran', Belarus)
2017 Mar. 13.99 UT: m1=16.8 CCD, Dia.=0.37', DC=8/, ... 0.25-m f/4.7 reflector + CCD ... S. Shurpakov (Observatory C36, Baran', Belarus)
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