64P/Swift-Gehrels

Visual Magnitude vs. Days from T (perihelion)
64P/Swift-Gehrels – COHP/LIADA Comet Observation Database – Lightcurve: 2019 Feb. 25 – H0=5.4 / n=12.8

64P/Swift-Gehrels
Reported observations:
2019 Feb. 26.81 UT: m1=11.6, Dia.=3’, DC=1, ... 20-cm L f:4(106x) ... Martin Lehky (Czech Republic) 
2019 Feb. 24.97 UT: m1=10.7, Dia.=4', DC=1/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Puerto de Aralla, Leon, Spain. 42º 54' N, 5º 48' W, alt. 1530 m) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Feb. 23.48 UT: m1=12.4, Dia.=2.3', DC=1, ... 40.0-cm L f/4.5(75x) ... Seiichi Yoshida (Ibaraki, Japan)
2019 Feb. 04.47 UT: m1=11.2, Dia.=3.1’, DC=2, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Very diffuse, weak centre. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Feb. 03.95 UT: m1=11.1, Dia.=4.5', DC=3, ... 27-cm SCT(92x) ... Valentín Díaz (Cancárix, Albacete, España)
2019 Feb. 03.44 UT: m1=11.6, Dia.=2.8’, DC=2, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, transparent coma, weakly condensed. Faintly visible at x39. Comparison stars checked using APASS data in Guide 9.0. Method= S, Cat= AQ]
2019 Jan. 25.86 UT: m1=9.8, Dia.=5', DC=3, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Villacintor, Leon, Spain. Alt. 930 m, 42º 29' N, 5º 11' W) [Mag. 12.1 (TK) star in coma. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Jan. 25.85 UT: m1=10.8, Dia.=3', DC=3, ... 20-cm T(80x) ... Carlos Labordena (Castellón, España)
2019 Jan. 24.72 UT: m1=10.7, Dia.=4', DC=2/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.19]
2019 Jan. 14.02 UT: m1=9.8, Dia.=6', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Several stars inside the coma, the brightest being mag. 10.8. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2019 Jan. 12.98 UT: m1=9.9, Dia.=5', DC=2, ... 25-cm L(66x) ... Valentín Díaz (La Romaneta, Alicante, España)
2019 Jan. 12.56 UT: m1=9.9, Dia.=6’, DC=3, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Diffuse, weakly condensed. Low altitude= 10.4°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2019 Jan. 11.91 UT: m1=10.1, Dia.=3', DC=2, ... 20-cm T(50x) ... Carlos Labordena (Castellón, España)
2019 Jan. 06.82 UT: m1=9.0, Dia.=8', DC=3, ... 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]
2019 Jan. 04.89 UT: m1=9.3, Dia.=7', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Les Retuertes - Sierra del Aramo, Asturias, Spain. alt. 1350 m, 43º 10' N, 5º 54' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2; 21.3 at zenith]
2019 Jan. 04.123 UT: m1=9.4 Dia.=4', DC=5, ... 20-cm SCT f/10(50x) ... Roger Jimenez (COAT, Lara, Venezuela) [MALE: 5.9. Sidgwick method. Tycho-2 comparison stars. Altura: 79°]
2019 Jan. 01.87 UT: m1=9.1, Dia.=7', DC=3, ... 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]
2018 Dec. 31.60 UT: m1=10.2, Dia.=6', DC=3, ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Ibaraki, Japan)
2018 Dec. 31.04 UT: m1=9.5, Dia.=5', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 30.88 UT: m1=9.0, Dia.=9', DC=4, ... 27-cm SCT(58x) ... Valentín Díaz (Cancárix, Albacete, España)
2018 Dec. 29.89 UT: m1=9.5, Dia.=5', DC=2, ... 15-cm T(44x) ... Carlos Labordena (Castellón, España)
2018 Dec. 28.46 UT: m1=9.2, Dia.=12’, DC=4, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia] [Circular coma, opaque centre, moderately condensed, fading to edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 27.46 UT: m1=9.2, Dia.=8.7’, DC=5, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia] [Enhances in Swan Band filter, opaque centre, fading to transparent edges. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 15.00 UT: m1=9.4, Dia.=7', DC=3, ... 20-cm T(50x) ... Carlos Labordena (Castellón, España)
2018 Dec. 14.06 UT: m1=9.0, Dia.=7', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Trichero - Soto y Amio, Leon, Spain. Alt. 1190 m, 42º 46' N, 5º 53' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Dec. 13.83 UT: m1=9.1, Dia.=3.5', DC=3/, ... 13-cm L F:5(25x) ... Danil Sidorko (Korenovsk, Russia)
2018 Dec. 12.04 UT: m1=8.9, Dia.=9', DC=3/, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 11.04 UT: m1=9.2, Dia.=6', DC=3/, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [image enhancement with comet filter]
2018 Dec. 11.05 UT: m1=9.0, Dia.=8', DC=3, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Dec. 09.89 UT: m1=9.9, Dia.=3.3', DC=4, ... 27-cm SCT(93x) ... Valentín Díaz (La Romaneta, Alicante, España)
2018 Dec. 09.80 UT: m1=9.2, Dia.=3', DC=3/, ... 13-cm L F:5(25x) ... Danil Sidorko (Korenovsk, Russia)
2018 Dec. 08.71 UT: m1=9.3, Dia.=3.3', DC=3, ...25-cm L F:5(46x, 150x) ... Danil Sidorko (Korenovsk, Russia)
2018 Dec. 08.48 UT: m1=8.5, Dia.=11’, DC=3/, ... 11x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, slight brightening to centre, weakly condensed. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 07.45 UT: m1=9.0, Dia.=10.4’; DC=5, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Star in coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Dec. 06.84 UT: m1=8.9, Dia.=8', DC=3/, ... 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]
2018 Dec. 05.82 UT: m1=9.3, Dia.=8', DC=3, ... 15-cm T(30x) ... Carlos Labordena (Castellón, España)
2018 Dec. 03.97 UT: m1=9.5, Dia.=6', DC=3, ... 10-cm R(26x) ... Valentín Díaz (La Romana, Alicante, España)
2018 Dec. 02.99 UT: m1=9.4, Dia.=5', DC=3, ... 20×80 B ... Roger Jimenez (Barquisimeto, Venezuela) [light pollution]
2018 Dec. 01.45 UT: m1=9.0, Dia.=8.5’, DC=3, ... 11x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Close to stars, Enhances in Swan Band filter, very diffuse. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Dec. 01.39 UT: m1=9.1, Dia.=6', DC=3/, ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.75 UT: m1=11.2 CCD, Dia.=1.26', DC=6, ... 0.25-m f/4.7 Newton + CCD ... Sergey Shurpakov (Observatory C36, Belarus)
2018 Nov. 30.45 UT: m1=9.2, Dia.=6.6’, DC=3, ... 11x70 B ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, close to mag 8.9 star. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= S, Cat= TK]
2018 Nov. 30.41 UT: m1=9.1, Dia.=8', DC=4, ... 40.0-cm L f/4.5 (36x) ... Seiichi Yoshida (Gunma, Japan)
2018 Nov. 30.04 UT: m1=8.9, Dia.=5', DC=3/, ... 20×80 B ... Roger Jimenez (Barquisimeto, Venezuela)
2018 Nov. 29.82 UT: m1=9.4, Dia.=4.5', DC=3/, ... 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.47]
2018 Nov. 29.47 UT: m1=9.1, Dia.=8.4’, DC=5/, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Large transparent outer coma, gradually brightens to opaque centre, small faint stellar pseudo-nucleus visible in good seeing. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 28.83 UT: m1=9.9, Dia.=5’, DC=2, ... 25x100 B ... Martin Lehky (Czech Republic)
2018 Nov. 27.82 UT: m1=9.7, Dia.=4', DC=3, ... 15-cm T(44x) ... Carlos Labordena (Castellón, España)
2018 Nov. 26.43 UT: m1=9.1, Dia.=8.5’, DC=5/, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances well in Swan Band filter. Small opaque centre, faintly stellar. Large diffuse and transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 20.94 UT: m1=10.1, Dia.=2.5', DC=3, ... 20-cm T(50x) ... Carlos Labordena (Castellón, España)
2018 Nov. 17.99 UT: m1=9.1, Dia.=4.5', DC=3/, ... 25.4-cm L(64x) ... Maik Meyer (Limburg, Germany)
2018 Nov. 17.79 UT: m1=9.3, Dia.=5’, DC=2/, ... 25x100 B ... Martin Lehky (Czech Republic)
2018 Nov. 16.99 UT: m1=9.0, Dia.=6.5', DC=4, ... 25.4-cm L(64x)  ... Maik Meyer (Limburg, Germany) [comet involved w/ an 8th mag star. MEY]
2018 Nov. 16.92 UT: m1=9.1, Dia.=5.5’, DC=2/, ... 25x100 B ... Martin Lehky (Czech Republic)
2018 Nov. 16.75 UT: m1=9.5, Dia.=3', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia) [Method S, Lm=6.32]
2018 Nov. 16.12 UT: m1=9.1, Dia.=7', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada del Fresno - Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10' N, 5º 54' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 20.9.].
2018 Nov. 14.76 UT: m1=9.3, Dia.=5’, DC=2/, ... 25x100 B ... Martin Lehky (Czech Republic)
2018 Nov. 14.01 UT: m1=9.6, Dia.=3.5', DC=5, ... 60-cm L(81x) ... Sandor Szabo (Sopron, Hungary)
2018 Nov. 13.81 UT: m1=9.2, Dia.=5', DC=3/, ... 25.4-cm L(64x) ... Maik Meyer (Limburg, Germany)
2018 Nov. 13.14 UT: m1=9.2, Dia.=7', DC=3/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada del Fresno - Sierra del Aramo, Asturias, Spain. Alt. 1280 m, 43º 10' N, 5º 54' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Nov. 12.76 UT: m1=9.3, Dia.=6', DC=4, ... 13-cm L(65x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.56]
2018 Nov. 11.44 UT: m1=9.5, Dia.=5’, DC=4, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse, star in coma. Moonlight. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 11.04 UT: m1=9.7, Dia.=5', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 10.96 UT: m1=9.0, Dia.=3.2', DC=3, ... 25-cm L(73x) ... Valentín Díaz (La Romana, Alicante, España)
2018 Nov. 09.15 UT: m1=9.2, Dia.=7', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada del Fresno - Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10' N, 5º 54' W) [Several stars inside the coma, the brightest being mag. 8.6 (TK). Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 Nov. 08.48 UT: m1=9.2, Dia.=8’, DC=4, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Enhances in Swan Band filter. Faint tenuous outer coma, opaque inner coma with small moderately condensed centre. Faint stars in coma. Outer coma appears slightly elongated to the West approximately. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Nov. 06.77 UT: m1=9.2, Dia.=6’, DC=3/, ... 20x100 B ... Martin Lehky (Czech Republic)
2018 Nov. 06.04 UT: m1=9.7, Dia.=5', DC=3, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Nov. 05.94 UT: m1=7.8, Dia.=10', DC=3, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Nov. 05.84 UT: m1=8.8, Dia.=6', DC=2, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Nov. 05.83 UT: m1=8.9, Dia.=5', DC=3, ... 15-cm T(30x) ... Carlos Labordena (Castellón, España)
2018 Nov. 04.77 UT: m1=9.7, Dia.=3', DC=5, .. 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, Lm=6.70]
2018 Nov. 03.83 UT: m1=8.7, Dia.=7', DC=3/, ... 25x100 B ... Juan Jose Gonzalez (Pandorado, Leon, Spain. Alt. 1190 m, 42º 47' N, 6º 00' W) [In 20 cm SCT (77x) : m1=9.3, Dia.=6', DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 Nov. 03.78 UT: m1=9.9, Dia.=3.5', DC=3/, ... 25.4-cm L f/5(64x) ... Maik Meyer (Limburg, Germany)
2018 Nov. 03.64 UT: m1=9.9, Dia.=5', DC=5, ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Gunma, Japan)
2018 Nov. 03.43 UT: m1=9.9, Dia.=6.2’, DC=3/, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 19.0°. Some interference from bright star in coma. Moderately condensed centre, opaque fading to semi-transparent outer coma. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 30.44 UT: m1=9.9, Dia.=8.0’, DC=4, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Semi-transparent outer coma, opaque inner coma. Low altitude = 19.3°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 30.06 UT: m1=10.0, Dia.=4', DC=2, ... 22-cm L(60x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Oct. 29.87 UT: m1=10.3, Dia.=3', DC=3, ... 20-cm SCT(50x) .... Carlos Labordena (Castellón, España)
2018 Oct. 29.45 UT: m1=9.6, Dia.=5', ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia)  
2018 Oct. 29.44 UT: m1=10.0, Dia.=6.2’, DC=4, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma enhances in Swan Band filter. Low altitude= 19.2°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 27.42 UT: m1=10.0, Dia.=5’, DC=3/, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma centre opaque, moderately condensed, outer coma semi-transparent. Coma centre dims in Swan Band filter. Low altitude = 17.1°. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Oct. 22.09 UT: m1= 10.3, Dia.=3', DC=2, ... 22-cm L (160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil);[ moonlight ]
2018 Oct. 21.05 UT: m1=10.3, Dia.=3', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.66]
2018 Oct. 20.15 UT: m1=9.5, Dia.=6', DC=3, ... 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: 21.3]
2018 Oct. 16.84 UT: m1=10.8, Dia.=2.4', DC=4/, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.69]
2018 Oct. 16.11 UT: m1=8.9, Dia.=7', DC=3, ... 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: 21.3]
2018 Oct. 15.79 UT: m1=11.0, Dia.=2.6', DC=4/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.23]
2018 Oct. 15.76 UT: m1=10.4, Dia.=2.8', DC=3, ... 25.4-cm L f/5(64x) ... Maik Mayer (Limburg, Germany)
2018 Oct. 15.74 UT: m1=12.6 CCD, Dia.=0.68', DC=7/, ... 0.20-m f/4 Schmidt-Newton + CCD ... S. Shurpakov (Observatory A98, Belarus)
2018 Oct. 14.76 UT m1=10.5, Dia.=2.3', DC=2/, ... 25.4-cm L f/5(64x) ... Maik Mayer (Limburg, Germany)
2018 Oct. 13.76 UT: m1=10.6, Dia.=2.3', DC=3, ... 25.4-cm L f/5(64x) ... Maik Mayer (Limburg, Germany)
2018 Oct. 13.73 UT: m1=10.4, Dia.=3.2', DC=3, ...25-cm L F:5(70.5x, 150x) ...Danil Sidorko (Korenovsk, Russia) 
2018 Oct. 11.74 UT: m1=10.8, Dia.=1.8', DC=4, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.63]
2018 Oct. 11.73 UT: m1=10.8, Dia.=2.0', DC=3/, ...25-cm L F:5(70.5x, 150x) ...Danil Sidorko (Korenovsk, Russia) 
2018 Oct. 10.77 UT: m1=10.5, Dia.=2.3', DC=3, ... 25.4-cm L f/5 (64x) ... Maik Meyer (Limburg, Germany)
2018 Oct. 08.44 UT: m1=11.2, Dia.=4.5’, DC=4, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Does not enhance in Swan Band filter. Slight interference from glare of nearby bright star. Opaque centre, moderately condensed, sometimes appears faintly stellar in periods of good seeing. Low altitude = 16.0°. Poor seeing. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Oct. 07.76 UT: m1=11.6, Dia.=2.5', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, Lm=6.63]
2018 Oct. 07.46 UT: m1=11.6, Dia.=2.3', DC=4/, ... 40.0-cm L f/4.5(75x) ... Seiichi Yoshida (Gunma, Japan)
2018 Oct. 06.80 UT: m1=13.4 CCD, Dia.=0.37', DC=7, ... 0.25-m f/4.7 Newton + CCD ... S. Shurpakov (Observatory C36, Belarus)
2018 Oct. 06.54 UT: m1=11.0, Dia.=2.2', DC=4, ... 40.0-cm L f/4.5(75x) ... Seiichi Yoshida (Gunma, Japan)
2018 Oct. 05.78 UT: m1=10.5, Dia.=2.2', DC=2/, ... 25.4-cm L f/5 (64x) ... Maik Meyer (Limburg, Germany)
2018 Oct. 04.85 UT: m1=11.7, Dia.=1.2', DC=3/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S]
2018 Oct. 04.80 UT: m1=11.3, Dia.=1.3', DC=2/, ... 25.4-cm L f/5 (104x) ... Maik Meyer (Limburg, Germany)
2018 Oct. 03.85 UT: m1=10.2, Dia.=6', DC=3, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55' N, 5º 50' W)[Sidgwick method. Tycho-2 comparison stars. SQM: 21.1]
2018 Sep. 30.93 UT: m1=12.3, Dia.=1', DC=3, ... 23.5-cm SCT(138x) ... Carlos Labordena (Castellón, España)
2018 Sep. 30.79 UT: m1=11.6, Dia.=1.3', DC=2/, ... 25.4-cm L f/5(104x) ... Maik Meyer (Limburg, Germany)
2018 Sep. 29.81 UT: m1=11.9:, Dia.=1.0', DC=2/, ... 25.4-cm L 5 104x) ... Maik Meyer (Limburg, Germany)
2018 Sep. 29.76 UT: m1=11.8, Dia.=2', DC=4, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.47]
2018 Sep. 29.74 UT: m1=14.1 CCD, Dia.=0.26', DC=7, ... 0.25-m f/4.7 Newton + CCD ... S. Shurpakov (Observatory C36, Belarus)
2018 Sep. 22.01 UT: m1=12.2, Dia.=1.5', DC=3/, ... 25.4-cm L(120x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.11]
2018 Sep. 19.16 UT: m1=12.2, Dia.=1.5', DC=4, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55' N, 5º 50' W) [Brighter inner coma diameter: 1.5', providing m=12.2 (AQ). Very faint and diffuse outer coma diameter: 5', providing m=10.8:(TK). Sidgwick method. APASS comparison stars. SQM: 21.5]
2018 Sep. 18.71 UT: m1=13.1, Dia.=1.3’, DC=4, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude= 19.6°; Diffuse coma with moderately condensed centre. Sky slightly hazy due to dust. Comparison stars checked using APASS data in Guide 9.0, Method= M, Cat= AQ]
2018 Sep. 17.67 UT: m1=12.2, Dia.=1.6', DC=5, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Gunma, Japan)
2018 Sep. 16.68 UT: m1=13.2, Dia.=0.8', DC=6, ... 40.0-cm L f/4.5(144x) ... Seiichi Yoshida (Gunma, Japan)
2018 Sep. 15.04 UT: m1=14.9 CCD, Dia.=0.50', DC=7/, ... 0.25-m f/4.7 Newton + CCD ... Serguey Shurpakov (Observatory C36, Belarus)
2018 Sep. 10.00 UT: m1=12.5, Dia.=1.1', DC=4, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55' N, 5º 50' W) [Brighter inner coma diameter : 1.1', providing m=12.5 (AQ). Very faint and diffuse outer coma diameter : 3', providing m=11.2:(AQ). Sidgwick method. APASS comparison stars. SQM: 21.5]
2018 Sep. 09.73 UT: m1=13.6, Dia.=1’, DC=3, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult; Very diffuse. Transparent coma, slightly brighter centre. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Sep. 01.89 UT: m1=11.0:, Dia.=6', DC=1, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [In evolution after the recent outburst. Inner coma magnitude was difficult to estimate due to close mag. 13.9 (APASS) star. Faint and diffuse outer coma diameter: 6', providing m=11.0: (TK). Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2018 Sep. 01.83 UT: m1=15.7 CCD, Dia.=0.22', DC=8, ... 0.25-m f/4.7 Newton + CCD ... Serguey Shurpakov (Observatory C36, Belarus)
2018 Aug. 31.84 UT: m1=15.7 CCD, Dia.=0.28', DC=7, ... 0.20-m f/4 Schmidt-Newton + CCD ... Serguey Shurpakov (Observatory A98, Belarus)
2018 Aug. 20.06 UT: m1=13.1, Dia.=1.1', DC=4, ... 20-cm SCT(133x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [In evolution after the recent outburst. Brighter inner coma diameter: 1.1', providing m=13.1 (APASS). Very faint and diffuse outer coma diameter: 7', providing m=10.7: (Tycho). Sidgwick method. SQM: 21.5]
2018 Aug. 18.25 UT: m1=13.1:, Dia.=1.25', DC=3, ... 22-cm L(160x) ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [averted vision]
2018 Aug. 17.91 UT: m1=16.8 CCD, Dia.=0.33', DC=7/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Serguey Shurpakov (Observatory A98, Baran', Belarus)
2018 Aug. 16.96 UT: m1=16.4 CCD, Dia.=0.17', DC=7/, ... 0.25-m f/4.7 Newton + CCD ... Serguey Shurpakov (Observatory С36, Baran', Belarus)
2018 Aug. 15.93 UT: m1=14.3, Dia.=0.7', DC=2, ... 60-cm L(305x) ... Sandor Szabo (Sopron, Hungary)
2018 Aug. 15.73 UT: m1=13.0, Dia.=1’, DC=2/, ... 25-cm L f:5(83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, opaque across coma, slightly brighter at centre. Post-outburst. Comparison stars checked using APASS data in Guide 9.0, Method= S, Cat= AQ]
2018 Aug. 15.23 UT: m1=14.0, Dia.=0.7’, DC=3, ... 41-cm L(229x) ... Alan Hale (Cloudcroft, New Mexic, USA)
2018 Aug. 14.95 UT: m1=13.2, Dia.=0.6', DC=7, ... 20-cm SCT(200x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [In outburst. Inner coma diameter: 0.6', surrounded by very faint outer coma. Sidgwick method. APASS comparison stars. SQM: 21.3]
2018 Aug. 06.01 UT: m1=17.1 CCD, Dia.=0.26', DC=8, ... 0.25-m f/4.7 Newton + CCD ... Serguey Shurpakov (Observatory С36, Baran', Belarus)
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