48P/Johnson

48P/Johnson
2018 Sep. 19.02 UT: m1=10.3, Dia.=7', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55' N, 5º 50' W) [Altitude: 16 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Sep. 18.70 UT: m1=12.8, Dia.=1.4’, DC=6, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque centre faintly stellar. Sky slightly hazy due to dust. Faintly visible at x39. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 17.65 UT: m1=13.3, Dia.=1.0', DC=4, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Gunma, Japan)
2018 Sep. 10.39 UT: m1=12.8, Dia.=1.6’, DC=6, .. 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, small opaque inner coma surrounding a faint stellar central condensation. Sky hazy due to dust/smoke in upper atmosphere. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 09.98 UT: m1=10.1, Dia.=7', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Aralla, Leon, Spain; Alt. 1720 m, 42º 55' N, 5º 50' W) [Altitude: 19 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Sep. 09.72 UT: m1=13.0, Dia.=1.2’, DC=5/, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma shows slight elongation to the NW approximately. Opaque centre, faintly stellar in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 08.40 UT: m1=12.8, Dia.=1.6’, DC=6, ... 25cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma edge diffuse and transparent, opaque inner coma, faint stellar central condensation. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 07.71 UT: m1=12.9, Dia.=1.2’, DC=6, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, gradually brightening to centre, small stellar central condensation. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Aug. 29.38 UT: m1=12.7, Dia.=1.8’, DC=6, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Faint diffuse outer coma, gradually brightening to a stellar centre. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Aug. 20.12 UT: m1=9.6, Dia.=7', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Mag. 11.5 (TK) star in coma. Altitude: 19 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Aug. 18.71 UT: m1=12.6, Dia.=1.5’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, opaque inner coma, stellar central condensation. Hint of tail to the NW approximately. Very windy conditions, observing at 1250m altitude. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Aug. 15.71 UT: m1=12.5, Dia.=1.4’, DC=6, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter, opaque inner coma, stellar centre, diffuse and transparent outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Aug. 15.02 UT: m1=9.7, Dia.=7', DC=2, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Altitude: 22 deg.Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Aug. 14.48 UT: m1=12.4, Dia.=1.5’, DC=6, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Outer coma diffuse, and transparent. Faint stellar central condensation. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Aug. 11.97 UT: m1=12.6, m2=15:, Dia.=0.7', DC=S5, Tail=2' to PA:250 deg., ... 0.60-m f/4 L(244x) ... Gabor Santa (Tarján, Hungary) [condensed coma with faint nucleus and broad, short tail, h=18 deg.]
2018 Aug. 10.05 UT: m1=9.8, Dia.=6', DC=2, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2; 21.6 at zenith]
2018 Aug. 08.72 UT: m1=12.7, Dia.=1.6’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar central condensation, diffuse outer coma. Hint of tail to the NW approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Aug. 08.19 UT: m1=12.2, Dia.=2', DC=3, ... 22-cm L (160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Aug. 08.06 UT: m1=9.7, Dia.=6', DC=2, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1; 21.5 at zenith]
2018 Aug. 06.60 UT: m1=12.6, Dia.=1.3’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse with faint stellar central condensation. Star on SW edge of coma. Does not enhance in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 July 23.75 UT: m1=13.0, Dia.=1.3’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Faint short tail extension to the West approximately. Inner coma opaque with aqua-blue coloured stellar centre, diffuse outer coma. No enhancement in Swan Band filter. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 July 22.14 UT: m1=9.8, Dia.=6', DC=1/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Quintanilla de los Oteros, Leon, Spain. Alt. 860 m, 42º 19' N, 5º 24' W) [Observation made under better atmospheric conditions, providing a wider outer coma diameter and brighter m1 in comparison with my previous July 18.13 estimate. Altitude: 20 deg. Astronomical twilight. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2018 July 20.73 UT: m1=13.0, Dia.=1.6’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Close to star. Pale blue stellar centre. Diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 July 18.73 UT: m1=13.2, Dia.=1.8’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Stellar central condensation visible in periods of good seeing. No enhancement in Swan Band filter. Faintly visible at x39. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 July 18.13 UT: m1=10.5, Dia.=5', DC=1/, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Faint outer coma. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8]
2018 July 16.72 UT: m1=13.3, Dia.=1.3’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Faint stellar central condensation, diffuse outer coma. Faint short coma extension to the West approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 July 14.00 UT: m1=13.7, Dia.=0.6', DC=4, ... 60-cm L (244x) ... Sandor Szabo (Sopron, Hungary)
2018 July 13.72 UT: m1=13.0; Dia.=1’, DC=5/, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, bright opaque centre, appears faintly stellar in periods of good seeing. Close to mag 13.9 star. Faint tail noticeable extending to WSW approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 July 13.69 UT: m1=13.3, Dia.=0.5', DC=7, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan)
2018 July 12.49 UT: m1=12.7, Dia.=1.2’, DC=3/, ... 25cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse coma, moderately condensed. Observed from backyard location in town, slight smoke haze. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 July 11.74 UT: m1=13.5, Dia.=1.2’, DC=4, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, moderately condensed centre. Slight interference from proximity of mag 11.6 star. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 June 23.75 UT: m1=14.1, Dia.=0.7’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Very faint stellar central condensation visible in good seeing. Diffuse outer coma. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 June 22.76 UT: m1=14.0, Dia.=1’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, centre opaque, faintly stellar in good seeing. NGC 7251 in same field and a little to the SW approximately. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 June 19.09 UT: m1=11.5, Dia.=4', DC=2, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [Sidgwick method. APASScomparison stars. SQM 21.0. Altitude: 22 deg. From dark mountain skies the comet shows a large and very diffuse outer coma. Field stars checked in DSS]
2018 June 13.75 UT: m1=14.4, Dia.=1.1’, DC=4, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, diffuse. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 June 12.73 UT: m1=14.6, Dia.=0.7’, DC=4, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, visible in good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 June 11.73 UT: m1=14.6, Dia.=0.8’, DC=3/4, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult, coma diffuse with slight brightening to centre, visible in periods of good seeing. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2011 Aug. 01.05 UT: m1=14.2, Dia.=0.6′, DC=6... 20-cm SCT (222x)... Juan José González (Alto del Castro – Aralla, alt. 1720 m., León, España) [Estrellas de campo comprobadas en el DSS. Estrellas de comparación de la fotometría Henden cerca de GRB030723. Cielo muy claro de montaña]
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