217P/LINEAR

217P/LINEAR
2017 Sep. 25.74 UT: m1=[14.0, ... 40.0-cm L f/4.5 (257x) ... Seiichi Yoshida (Gunma, Japan)
2017 Sep. 21.76 UT: m1=13.9, Dia.=0.8’, DC=3, ... 25-cm L f:5 (166x) ... Chris Wyatt (Walcha, NSW, Australia) [Visible in periods of good seeing, difficult, close to stars. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Sep. 03.004 UT: m1=13.4, Dia.=0.3', DC=3, ... 25-cm L (266x) ... Danil Sidorko (Korenovsk, Russia) [SQM = 21.65]
2017 Sep. 01.77 UT: m1=13.6, Dia.=0.9’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, close to stars. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Aug. 30.72 UT: m1=12.9, Dia.=1’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, low altitude= 15.1°. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Aug. 21.12 UT: m1=12.2, Dia.=2', DC=3, ... 20-cm SCT (133x) ... Juan Jose Gonzalez (Alto del Castro - Aralla, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [Sidgwick method. APASS comparison stars. SQM: 20.9]
2017 Aug. 19.74 UT: m1=12.8, Dia.=1’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, slight brightening to centre, low altitude = 18.6°. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 Aug. 19.06 UT: m1=12.5, Dia.=1', DC=3, ... 0.60-m L (184x) ... Gabor Santa (Hungary)
2017 Aug. 01.76 UT: m1=12.6, Dia.=1’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter, coma slightly elongated to NW approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 July 25.79 UT: m1=12.2, Dia.=1.4’, DC=5/6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre with a faintly stellar central condensation. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 July 24.78 UT: m1=12.1, Dia.=2.5’, DC=5/6, ... 25-cm L f:5 (39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter, slight interference by zodiacal light. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2017 July 05.79 UT: m1=12.2, Dia.=2.2’, DC=5/6, ... 25-cm L f:5 (39x) .... Chris Wyatt (Walcha, NSW, Australia) [Coma does not enhance in Swan Band filter, central condensation sometimes stellar in good seeing, slight interference from zodiacal light and Venus glare. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 June 30.73 UT: m1=13.0, Dia.=0.7’, DC=4/5, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse with moderately condensed centre. Hint of a tail to the WSW. Low altitude = 16.9°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2017 June 22.75 UT: m1=13.3, Dia.=0.8’, DC=5/6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque with small central condensation, almost stellar. Slightly elongated to the South-East approximately. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2010 Feb. 06.34 UT: m1=13.0 CCD, Dia.=0.21′, DC=5... 0.36-m f/3.8 reflector + CCD... Sergey Shurpakov (Baran’, Belarus)
2010 Feb. 02.88 UT: m1=13.5, Dia.=1.2′, DC=2... 20-cm SCT (133x)... Juan José González (Camposagrado, alt. 1135 m, León, España) [Estrellas de comparación de la secuencia Henden de V650 Ori]
2010 Ene. 12.92 UT: m1=12.7, Dia.=1.2′, DC=5... 20-cm SCT (133x)... Juan José González (Grandota – Oviedo, alt. 430 m, España)
2009 Dec. 18.208 UT: m1=12.1, Dia.=1′, DC=5... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil)
2009 Dec. 12.02 UT: m1=11.7, Dia.=1.5′, DC=4... 20-cm SCT (133x)... Juan José González (Alto del Castro, alt. 1720 m, León, España)
2009 Dec. 11.95 UT: m1=11.7, Dia.=2′, DC=3... 23.5-cm SCT (67x)... Carlos Labordena (Castellón, España)
2009 Dec. 06.062 UT: m1=10.9, Dia.=2′, DC=4... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil)
2009 Nov. 24.03 UT: m1=11.2, Dia.=1.2′, DC=3... 20-cm SCT (133x)... Juan José González (Alto del Castro, alt. 1720 m, León, España)
2009 Nov. 19.01 UT: m1=11.0 CCD, Dia.=2.5′, DC=6... 25-cm L +CCD +Rc filter... Toni Scarmato (Calabria, Italia)
2009 Nov. 18.08 UT: m1=10.7, Dia.=1.2′, DC=3... 20-cm SCT (100x)... Juan José González (Alto del Castro, alt. 1720 m, León, España)
2009 Nov. 14.260 UT: m1=10.6, Dia.=2.5′, DC=4/... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil)
2009 Nov. 13.125 UT: m1=10.6, Dia.=2.5′, DC=4/... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil)
2009 Oct. 26.08 UT: m1=10.3, Dia.=2.5′, DC=5, Tail= 0.1 deg. in PA: 280 deg ... 20-cm SCT (77x)... Juan José González (Alto del Castro, alt. 1720 m, León, España)
2009 Oct. 24.208 UT: m1=10.5, Dia.=2.5′, DC=4/... 22-cm L f:6.5 (60x)... Marco Goiato (Araçatuba, Brasil) [coma elongada em PA 290°]
2009 Oct. 21.167 UT: m1=10.5, Dia.=2.5′, DC=4/... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil)
2009 Oct. 18.15 UT: m1=10.1, Dia.=2′, DC=4... 20-cm R f:9... Alfons Diepvens (Balen, Belgium)
2009 Oct. 17.04 UT: m1=10.2, Dia.=3′, DC=4, Tail= 5′... 23.5-cm SCT (67x)... Carlos Labordena (Castellón, España)
2009 Oct. 16.187 UT: m1=10.4:, Dia.=2.5′, DC=5... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil) [muito próximo a estrela com m1:6.22]
2009 Oct. 16.10 UT: m1=10.1, Dia.=2.5′, DC=5/, Tail= 0.1º in PA: 290º... 20 -cm SCT (77x)... Juan José González (Alto del Castro, alt. 1720 m, León, España) [Después del reciente y menor outburst, el cometa muestra su coma interna más brillante, pero sin un incremento notable hasta ahora de la magnitud visual total]
2009 Oct. 10.156 UT: m1=10.4, Dia.=3′, DC=4... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil) [Luar]
2009 Sep. 29.13 UT: m1=9.9, Dia.=3.5′, DC=5, Tail= 0.2º in PA: 280º... 20 -cm SCT (77x)... Juan José González (Alto del Castro, alt. 1720 m, León, España)
2009 Sep. 26.292 UT: m1=10.2, Dia.=2′, DC=5... 22-cm L f:6.5 (60x)... Marco Goiato (Araçatuba, Brasil)
2009 Sep. 25.08 UT: m1=10.4, Dia.=3′, DC=5, no tail... 23.5-cm SCT (67x)... Carlos Labordena (Castellón, España) [Algo alargado]
2009 Sep. 24.73 UT: m1=9.9, Dia.=4′... 25×100 B... David A. J. Seargent (Cowra, NSW, Australia)
2009 Sep. 24.72 UT: m1=10.2, Dia.=3′, Tail= 0.17 deg. in PA: 270 deg ... 25.4-cm L (71x)... David A. J. Seargent (Cowra, NSW, Australia) [Fainter using Swan Band filter]
2009 Sep. 23.14 UT: m1=9.8, Dia.=4′, DC=5, Tail= 0.2º in PA: 280º... 20 -cm SCT (77x)... Juan José González (Alto del Castro, alt. 1720 m, León, España)
2009 Sep. 22.394 UT: m1=10.5, Dia.=3.0′, DC=4... 15-cm SCT (37x y 60x)... Salvador Aguirre (Hillo, Sonora, México)
2009 Sep. 20.75 UT: m1=10.2, Dia.=4.0′, DC=7, Tail= 8′ in PA: 255 deg.... 40.0-cm L f/4.5 (36x)... Seiichi Yoshida (Gunma, Japan)
2009 Sep. 13.292 UT: m1=10.5, Dia.=1.5′, DC=5... 22-cm L f:6.5 (60x)... Marco Goiato (Araçatuba, Brasil) [Luar]
2009 Sep. 01.14 UT: m1=11.0, Dia.=1′, DC=7... 200-mm R F9... Alfons Diepvens (Balen, Belgium)
2009 Aug. 31.15 UT: m1=9.9, Dia.=4′, DC=5, Tail= 0.2º en PA: 270º... 20-cm SCT (77x)... Juan José González ( Alto del Castro – Aralla, alt. 1720 m, León, España)
2009 Aug. 29.333 UT: m1=10.9, Dia.=2′, DC=6/... 22-cm L f:6.5 (160x)... Marco Goiato (Araçatuba, Brasil)
2009 Aug. 29.16 UT: m1=10.2, Dia.=3′, DC=5... 20-cm SCT (77x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m, León, España)
2009 Aug. 22.05 UT: m1=11.6, Dia.=3′, DC=4... 23.5-cm SCT (67x)... Carlos Labordena (Castellón, España)
2009 Aug. 19.10 UT: m1=10.1, Dia.=4′, DC=4, Tail= 0.1º in PA: 270º... 20 -cm SCT (77x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m, León, España)
2009 Aug. 15.61 UT: m1=11.0, Dia.=2’, DC=5... 20-cm T f:10 (63x)... Chris Wyatt (Walcha, NSW, Australia) [No tail, bright star in vicinity, coma elongated to SW, 25 degrees above East horizon. Comp Star= GSC-4710-0103... Method= S... Cat= HS ]
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