21P/Giacobini-Zinner

21P/Giacobini-Zinner
Reported observations:
2018 Sep. 19.26 UT: m1=7.3, Dia.=5', DC=6, ... 15x70 B ... Willian Souza (Sao Paulo, Brazil)
2018 Sep. 19.32 UT: m1=7.4, Dia.=5', DC=5, ... 8.0-cm f/7.5 ED refractor (19x) ... Willian Souza (Sao Paulo, Brazil)
2018 Sep. 19.18 UT: m1=7.6, Dia.=6', DC=6/, Tail= 0.6 deg. in PA: 280 deg., ... 10x50 B ... Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55' N, 5º 50' W) [Zodiacal light. Sidgwick method. Tycho-2 comparison stars.SQM: 21.2]
2018 Sep. 18.76 UT: m1=8.5, Dia.=4.8’, DC=5/, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma enhances well in Swan band filter. Faint tail visible, traced to 23’ in length in P.A. 280° approximately. Strongly condensed central condensation, opaque fan-shaped outer coma to the West approximately tapering in brightness to the edges. Beautiful! Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Sep. 17.71 UT: m1=6.8, Dia.=13', DC=6, ... 10x70R ... Seiichi Yoshida (Gunma, Japan)
2018 Sep. 17.70 UT: m1=7.7, Dia.=8', DC=7, Tail= 13' in PA: 275 deg., ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Gunma, Japan)
2018 Sep. 17.11 UT: m1=7.4, Dia.=10', DC=4/, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Sep. 17.01 UT: m1=7.7, Dia.=4', DC=5, Tail= 7 arcmin. in PA: 290 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.19]
2018 Sep. 16.67 UT: m1=6.9, Dia.=11', DC=6, ... 10x70R ... Seiichi Yoshida (Gunma, Japan)
2018 Sep. 16.67 UT: m1=8.1, Dia.=6', DC=7, Tail= 8.5' in PA: 275 deg., ... 40.0-cm L f/4.5(36x) ... Seiichi Yoshida (Gunma, Japan)
2018 Sep. 16.13 UT: m1=7.0, Dia.=10', DC=4/, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Sep. 14.98 UT: m1=9.7 CCD, Dia.=1.77', DC=6/, ... 0.20-m f/4 Newton + CCD ... Serguey Shurpakov (Observatory C36, Belarus)
2018 Sep. 13.75 UT: m1=7.2, Dia.=4', Tail= 0.2degrees PA= 270 deg., ... 25x100 B ... David A. J. Seargent (Cowra, NSW, Australia) [Somewhat enhanced through Swan Band filter]
2018 Sep. 12.13 UT: m1=7.2, Dia.=10, DC=5, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Sep. 11.34 UT: m1=7.3, Dia.=6', DC=5, Tail= 15 arcmin. in PA: 270 deg., ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Sep. 10.19 UT: m1=7.0, Dia.=5.0', DC=6, ... 20x80 B ... J. P. Navarro Pina (Observatorio Astronomico Vega del Thader, MPC J70, Murcia, Spain)
2018 Sep. 10.16 UT: m1=7.2, Dia.=7', DC=6/, Tail= 2.1 deg. in PA: 280 deg., ... 10x50 B ... Juan Jose Gonzalez (Aralla, Leon, Spain. Alt. 1720 m, 42º 55' N, 5º 50' W) [Zodiacal light. Sidgwick method. Tycho-2 comparison stars.SQM: 21.4]
2018 Sep. 09.78 UT: m1=8.0:, Dia.=4.2’, DC=6, ... 25-cm L f:5(39x) ... Chris Wyatt (Walcha, NSW, Australia) [Magnitude uncertain due to background star in coma. Coma enhances well in Swan Band filter. Faint, slightly curved tail visible, traced to 19’ in length in P.A. 282° approximately (Concave side to the North). Slight twilight interference. Rapid motion noticeable. Inner coma opaque and oval in shape, fades into tail extremity. Central condensation well condensed with a faint stellar pseudo-nucleus. Comparison stars checked using Tycho-2 data in Guide 9.0, Method= M, Cat= TK]
2018 Sep. 09.33 UT: m1=7.2, Dia.=6', DC=5/, Tail= 15 arcmin. in PA: 270 deg., ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2018 Sep. 08.27 UT: m1=7.3, Dia.=5', DC=5, ... 15x70 B ... Willian Souza (Sao Paulo, Brazil)
2018 Sep. 08.10 UT: m1=7.3, Dia.=8.5', DC=5, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Sep. 08.08 UT: m1=7.3, Dia.=6', DC=5, Tail= 20', ... 15-cm T(30x) ... Carlos Labordena (Castellón, España)
2018 Sep. 08.07 UT: m1=7.2, Dia.=6', DC=4, Tail= 10', ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Sep. 05.90 UT: m1=7.4, Dia.=6', DC=5, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=5.95]
2018 Sep. 05.35 UT: m1= 7.3, Dia.=6', DC=5, Tail= 15 arcmin in PA: 270 deg., ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight]
2018 Sep. 05.10 UT: m1=7.4, Dia.=5', DC=6, Tail= 10', ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Sep. 01.94 UT: m1=7.6, Dia.=5', DC=6, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Sep. 01.93 UT: m1=7.4, Dia.=5', DC=6/, ... 10x50 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Altitude: 13 deg. In 25x100B : m1=7.7, Dia.=5', DC=6, Tail= 0.3 deg. in PA: 270 deg., Sidgwick method. Tycho-2 comparison stars.SQM: 20.9]
2018 Sep. 01.92 UT: m1=8.8 CCD, Dia.=1.22', DC=6/, ... 0.25-m f/4.7 Newton + CCD ... Serguey Shurpakov (Observatory C36, Belarus) 
2018 Aug. 31.86 UT: m1=8.8 CCD, Dia.=1.60', DC=6/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Serguey Shurpakov (Observatory A98, Belarus)
2018 Aug. 27.35 UT: m1=7.3, Dia.=5', DC=5, ... 20x100 B ... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Method: S. Moonlight; comet altitude: 13°]
2018 Aug. 25.01 UT: m1=7.8, Dia.=5', DC=6, Tail= 6 arcmin, in PA: 270 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=5.36]
2018 Aug. 24.92 UT: m1=9.2 CCD, Dia.=1.77', DC=7/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Serguey Shurpakov (Observatory A98, Belarus)
2018 Aug. 23.96 UT: m1=8.7 CCD, Dia.=1.77', DC=6/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Serguey Shurpakov (Observatory A98, Belarus)
2018 Aug. 23.07 UT: m1=7.5, Dia.=9', DC=5, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Aug. 22.95 UT: m1=7.5, Dia.=3', DC=5, Tail= 8' in PA: 255 deg., ... 25-cm L F:5(42x,70.5x) ... Danil Sidorko (Korenovsk, Russia) 
2018 Aug. 22.95 UT: m1=8.6 CCD, Dia.=2.12', DC=6/, Tail=17' in PA: 259.7 deg., ... 0.15-m f/3.2 Volosov-Newton + CCD ... Serguey Shurpakov (Observatory C36, Belarus)
2018 Aug. 22.86 UT: m1=7.4, Dia.=8', DC=6/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 21.88 UT: m1=7.6, Dia.=8', DC=3, ... 13-cm L F:5(25x) ... Danil Sidorko (Korenovsk, Russia)
2018 Aug. 21.86 UT: m1=7.4, Dia.=8', DC=6/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 20.86 UT: m1=7.5, Dia.=8', DC=6/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2017 Aug. 20.08 UT: m1=7.4, Dia.=4', DC=4, Tail= 0.1 deg. in PA 268 deg., ... 20x60 B ... José J. Chambó (Hoya Redonda, España)
2018 Aug. 20.03 UT: m1=7.5, Dia.=6', DC=6/, ... 10x50 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [In 25x100 B: m1=7.8, Dia.=5', DC=6, Tail: 0.4 deg. in PA 260 deg, Sidgwick method. Tycho-2 comparison stars.SQM: 21.3]
2018 Aug. 19.86 UT: m1=7.5, Dia.=8', DC=6/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 19.07 UT: m1=7.3, Dia.=9', DC=5, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Aug. 18.86 UT: m1=7.7, Dia.=9', DC=6/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 18.06 UT: m1=7.4, Dia,=9', DC=4/, ... 10x50 B .... Maik Meyer (Limburg, Germany)
2018 Aug. 17.86 UT: m1=7.7, Dia.=9', DC=6/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 17.83 UT: m1=9.3 CCD, Dia.=1.66', DC=6/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Serguey Shurpakov (Observatory A98, Belarus)
2018 Aug. 16.87 UT: m1=8.0, Dia=6', DC=6, Tail=10 arcmin in PA= 255 degrees, ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.63]
2018 Aug. 16.86 UT: m1=7.8, Dia.=9', DC=6/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 16.86 UT: m1=7.9, Dia=8', DC=5/, ... 20x60 B ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone]
2018 Aug. 16.03 UT: m1=7.6, Dia.=9, DC=4/, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Aug. 15.12 UT: m1=8.0, Dia.=7', DC=6, Tail=25', ... 15-cm T(30x) ... Carlos Labordena (Castellón, España)
2018 Aug. 15.11 UT: m1=7.8, Dia.=7', DC=5, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Aug. 15.09 UT: m1=7.7, Dia.=9', DC=4/, ... 10x50 B .... Maik Meyer (Limburg, Germany) [Method: M, Cat: TK]
2018 Aug. 14.93 UT: m1=7.8, Dia.=8', DC=6, ... 10x50 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [In 25x100 B: m1=8.1, Dia.=6', DC=5/, Tail= 0.6 deg. in PA 260 deg, Sidgwick method. Tycho-2 comparison stars. SQM: 21.3]
2018 Aug. 13.80 UT: m1=8.4, Dia.=3.2', DC=3, Tail= 6' in PA: 260 deg., ... 25-cm L (70.5x) ... Danil Sidorko (Korenovsk, Russia) 
2018 Aug. 13.44 UT: m1=7.9, Dia.=7', DC=4, Tail= 0.2 deg. in PA: 250 deg., ... 20x80 B ... Man-To Hui (Mt. Pinos, CA, USA)
2018 Aug. 13.04 UT: m1=7.9, Dia.=7', DC=5, ... 10x50 B ... Maik Meyer (Limburg, Germany) [method M]
2018 Aug. 12.98 UT: m1=8.4, Dia.=9.0', DC=4/, ... 20x80 B ... Marek Biely (Brno, 226 m.a.s.l., Czech Republic)
2018 Aug. 12.86 UT: m1=7.7, Dia.=9', DC=6, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 12.81 UT: m1=8.0, Dia.=4', DC=6, Tail= 8 arcmin. in PA: 260 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.42]
2018 Aug. 12.02 UT: m1=7.8, Dia.=7, DC=4, ... 10x50 B ... Maik Meyer (Limburg, Germany)
2018 Aug. 11.95 UT: m1=7.9, Dia.=7', DC=6, ... 10x50 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [In 25x100 B: m1=8.1, Dia.=7', DC=5/, Tail: 0.4 deg. in PA: 250 deg, Sidgwick method. Tycho-2 comparison stars. SQM: 21.2; 21.3 at zenith]
2018 Aug. 11.93 UT: m1=7.3, m2=11.5, Dia.=10', DC=S6, Tail=30' to PA:270 deg., ... 10x50 B, 0.20-m L(29x), 0.60-m f/4 L(188x) ... Gabor Santa (Tarján, Hungary) [Very-very bright, very easy to see, strong nucleus, fan-shape outflow from the nucleus toward the Sun, big outer coma, broad, bright tail, h=48deg. NELM=6.5]
2018 Aug. 11.89 UT: m1=9.1, Dia.=2.5', DC=3, ... 10-cm B(25x) ... Marian Legutko (Gliwice, Poland) [mostly cloudy, poor transparency]
2018 Aug. 11.86 UT: m1=7.8, Dia.=9', DC=6, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 11.06 UT: m1=8.3, Dia.=7', DC=5, Tail=15', ... 15-cm T(30x) ... Carlos Labordena (Castellón, España)
2018 Aug. 11.05 UT: m1=8.2, Dia.=7', DC=4, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Aug. 10.89 UT: m1=8.6 CCD, Dia=2.10'  DC=7, ... 0.20-m f/4 Schmidt-Newton + CCD ... Sergey Shurpakov (Observatory A98, Baran', Belarus)
2018 Aug. 09.93 UT: m1=8.6, Dia.=6', DC=5/, ... 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=9.0, Dia.=6', DC=5/, Tail: 0.2 deg. in PA: 250 deg, Sidgwick method. Tycho-2 comparison stars. SQM: 21.3; 21.6 at zenith]
2018 Aug. 09.91 UT: m1=8.8, Dia.=4.7', DC=5/, ... 20x80 B ... Marek Biely (Brno, 226 m.a.s.l., Czech Republic)
2018 Aug. 09.86 UT: m1=7.8, Dia.=8', DC=6, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 08.82 UT: m1=8.4, Dia.=5', DC=6, Tail= 7 arcmin., in PA: 255 deg., ... 25.4-cm L (48x) .... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.48]
2018 Aug. 07.94 UT: m1=8.0, Dia.=12', DC=6, ... 10x50 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [In 25x100B : m1=8.5, Dia.=7', DC=5/. In 20 cm SCT (77x): m1=8.9, Dia.=7', DC=5, Tail: 0.15 deg. in PA 250 deg, Sidgwick method. Tycho-2 comparison stars. SQM: 21.3, 21.5 at zenith]
2018 Aug. 07.86 UT: m1=8.0, Dia.=8', DC=5/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 06.86 UT: m1=8.0, Dia.=8', DC=5/, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 05.97 UT: m1=8.7, Dia.=5', DC=4, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España)
2018 Aug. 05.91 UT: m1=8.9, Dia.=5', DC=6, Tail= 9 arcmin. in PA: 235 deg., ... 25.4-cm L(48x) ... Alexsandr Morozov (Novozybkov, Russia) [method M, green zone, Lm=6.47]
2018 Aug. 05.86 UT: m1=8.1, Dia.=8', DC=5, ... 10x50 B ... Martin Lehky ((Hradec Kralove, Czech Republic)
2018 Aug. 04.30 TU: m1=8.0, Dia.=15', DC=1, ... 20x80 B ... Charles S. Morris (Fillmore, CA, USA) [Observation was at moonrise. Comet was much larger and more diffuse than reported by others. Comet was also observed in 10x50B with similar results. Tz=5.0+]
2018 Aug. 03.91 UT: m1=9.3, Dia.=4.4', DC=4, ... 20x80 B ... Marek Biely (Brno, 226 m.a.s.l., Czech Republic) [Already visible]
2018 Aug. 03.13 UT: m1=8.4, Dia.=1.7', DC=4/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Sergey Shurpakov (Observatory A98, Baran', Belarus)
2018 Aug. 03.88 UT: m1=9.6, Dia.=4', DC=4, ... 15-cm T(30x) ... Carlos Labordena (Castellón, España)
2018 Aug. 02.97 UT: m1=10.1 CCD, Dia.=1.77', DC=6/, Tail=9.6' in PA:228 deg., ... 0.20-m f/4 Schmidt-Newton + CCD ... Sergey Shurpakov (Observatory A98, Baran', Belarus)
2018 Aug. 01.94 UT: m1=9.1, Dia.=3', DC=5/, ... 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S]
2018 Aug. 01.92 UT: m1=8.7, Dia.=8', DC=5, Tail=3' in PA=225 deg., ... 12.7-cm L(25x) ... Valentín Díaz (La Romana, Alicante, España) 
2018 Aug. 01.92 UT: m1=9.3, Dia.=5', DC=5, ... 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: 21.4]
2018 July 30.92 UT: m1=9.4, Dia.=2.5', DC=5/, ... 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S]
2018 July 30.90 UT: m1=10.0 CCD, Dia.=1.66', DC=7, Tail=6.7' in PA=230 deg., ... 0.20-m f/4 Schmidt-Newton + CCD ... Sergey Shurpakov (Observatory A98, Baran', Belarus)
2018 July 25.99 UT: m1=9.9, Dia.=2.5', DC=5, ... 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Lm=5.96]
2018 July 24.04 UT: m1=9.1, Dia.=3.5', DC=4/, ... 12.0-cm R f:5 (30x) .... Maik Meyer (Limburg, Germany)
2018 July 23.95 UT: m1=10.4 CCD, Dia.=0.94', DC=6/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Sergey Shurpakov (Observatory A98, Baran', Belarus)
2018 July 23.48 UT: m1=9.4, Dia.=5', DC=5, ... 20x80 B ... Man To Hui (Mt. Pinos, CA, USA) [twilight]
2018 July 22.88 UT: m1=10.0, Dia.=2', DC=5/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2018 July 22.10 UT: m1=9.5, Dia.=4', DC=4, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Quintanilla de los Oteros, Leon, Spain. Alt. 860 m, 42º 19' N, 5º 24' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 July 21.92 UT: m1=9.9, Dia.=2', DC=2, ... 12.7-cm T F/12(60x) ... Marian Legutko (Gliwice, Poland) [partly cloudy]
2018 July 19.00 UT: m1=9.6, Dia.=2.5', DC=D5, ... 25.4-cm L f:5 (64x) ... Maik Myer (Limburg, Germany)
2018 July 18.04 UT: m1=9.9, Dia.=4', DC=4, ... 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 July 17.99 UT: m1=9.9, Dia.=3.0', DC=D5, ... 25.4-cm L f:5 (64x) ... Maik Meyer (Eppenrod, Limburg, Germany)
2018 July 17.89 UT: m1=10.2, Dia.=2', DC=4/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2018 July 16.99 UT: m1=9.9, Dia.=4.0', DC=D5, ... 25.4-cm L f:5 (64x) ... Maik Meyer (Eppenrod, Limburg, Germany)
2018 July 14.99 UT: m1=9.8, Dia.=2.8', DC=4, ... 25.4-cm L f:5 (64x) ... Maik Meyer (Eppenrod, Limburg, Germany)
2018 July 14.07 UT: m1=10.0, Dia.=3.5', DC=3, ... 20-cm T(80x) ... Carlos Labordena (Castellón, España) [no tail]
2018 July 13.98 UT: m1=10.0, Dia.=2.8', DC=4, ... 12.0-cm R f:5 (30x) ... Maik Meyer (Limburg, Germany)
2018 July 13.97 UT: m1=10.1, Dia.=2.4', DC=3/, ... 25.4-cm L f:5 (64x) ... Maik Meyer (Limburg, Germany)
2018 July 13.95 UT: m1=10.4, Dia.=0.9', DC=6, ... 60-cm L (116x) ... Sandor Szabo (Sopron, Hungary) [Tail= is 3.5’ to PA: 235 deg.]
2018 July 13.50 UT: m1=10.0, Dia.=4', DC=5, ... 40.0-cm L f/4.5 (36x) ... Seiichi Yoshida (Gunma, Japan)
2018 July 12.89 UT: m1=10.1, Dia.=1.5', DC=5, Tail= 1.7 arcmin. in PA: 225 deg., ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Lm=6.63]
2018 July 09.97 UT: m1=10.3, Dia.=3.5', 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 July 09.91 UT: m1=10.4, Dia.=1.5', DC=4/, Tail=2' PA=220 deg., ... 25.4-cm L(120x) ... Alexsandr Morozov, (Novozybkov, Russia) [Method S, green zone]
2018 July 08.96 UT: m1=10.4, m2=14.3, Dia.=1.4’, DC=s6, Tail=10' towards PA: 215 deg., ... 35-cm L (69x) ... Gábor Sánta (Göd, county Pest, Hungary) [h=70 deg., NELM=5,9. Great comet! Nucleus is 14.3 magnitudes, inner coma is round, this surrounded by a drop-like structure, outer coma is elongated. Tail is straight, its lenght is 10 arcminutes, first 4-5' is very obvious. Tail best seen with 165x (Baader Classic Ortho 10 mm)] 
2018 July 06.97 UT: m1=10.2, Dia.=3.5', DC=3, ... 20-cm T(80x) ... Carlos Labordena (Castellón, España)
2018 July 06.96 UT: m1=11.1, Dia.=1.4', DC=4, ... 30-cm L(107x) ... Valentín Díaz (Xorret de Cati, Alicante, España)
2018 July 06.90 UT: m1=10.8, Dia.=1.5', DC=4/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [Method S, green zona pollution]
2018 July 05.95 UT: m1=10.4, Dia.=3', DC=3, ... 20-cm T(80x) ... Carlos Labordena (Castellón, España)
2018 July 04.94 UT: m1=10.7, Dia.=2.2', DC=3/, ... 20-cm L f:4 (42x) ... Martin Lehky (Hradec Kralove, Czech Republic)
2018 July 04.90 UT: m1=11.3, Dia.=1', DC=4, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) (Method S, green zona pollution)
2018 July 03.97 UT: m1=10.2, Dia.=3.5', DC=3, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Villar del Yermo, Leon, Spain; Alt. 805 m, 42º 20' N, 5º 42' W) [Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 July 03.94 UT: m1=10.7, Dia.=2.5', DC=3, ... 20-cm L f:4 (42x) ... Martin Lehky (Hradec Kralove, Czech Republic)
2018 July 02.94 UT: m1=10.9, Dia.=2.5', DC=3/, ... 20-cm L f:4 (42x) ... Martin Lehky (Hradec Kralove, Czech Republic)
2018 June 23.73 UT: m1=12.2, Dia.=1.5’, DC=3/, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 12.5°, Difficult due to faint background star in coma. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 June 22.73 UT: m1=12.3, Dia.=1’, DC=6, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Difficult due to nearby star. Low altitude = 12.9°. Comparison stars checked using APASS data in Guide 9.0; Method= M; Cat= AQ]
2018 June 17.05 UT: m1=13.0, Dia.=0.9', DC=4, ... 25-cm L(126x) ... Valentín Díaz (Puebla de Don Fadrique, Granada, España)
2018 June 16.96 UT: m1=12.4, Dia.=1.5', DC=3, ... 20-cm T(113x) ... Carlos Labordena (Castellón, España)
2018 June 13.90 UT: m1=12.6, Dia.=1', DC=3/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia)
2018 June 13.74 UT: m1=12.5, Dia.=1.2’, DC=3, ... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Coma diffuse with brightening to weakly condensed centre. Low altitude = 18.3°. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 June 13.02 UT: m1=12.2, Dia.=1.5', DC=3/, ... 20-cm SCT (133x) ... Juan Jose Gonzalez (Pandorado, Leon, Spain; Alt. 1190 m, 42º 47' N, 6º 00' W) [Sidgwick method. APASS comparison stars. SQM: 21.2]
2018 June 11.72 UT: m1=12.5, Dia.=1.5’, DC=3; 25-cm L f:5 (83x); Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 19.8°; Diffuse, difficult to see in crowded star field, slight brightening to centre. Comparison stars checked using APASS data in Guide 9.0; Method= S; Cat= AQ]
2018 May  28.93 UT: m1=15.3 CCD, Dia.=0.29', DC=6/, ... 0.25-m f/4.7 Newton + CCD ... Sergey Shurpakov (Observatory C36, Baran', Belarus)
2018 May  25.97 UT: m1=15.6 CCD, Dia.=0.22', DC=7/, ... 0.25-m f/4.7 Newton + CCD ... Sergey Shurpakov (Observatory C36, Baran', Belarus)
2018 May  21.95 UT: m1=16.3 CCD, Dia.=0.39', DC=7/, ... 0.20-m f/4 Schmidt-Newton + CCD ... Sergey Shurpakov (Observatory A98, Baran', Belarus)
2018 May  19.96 UT: m1=16.0 CCD, Dia.=0.18', DC=7/, Tail=0.30' in PA:240 deg., ... 0.25-m f/4.7 Newton + CCD ... Sergey Shurpakov (Observatory C36, Baran', Belarus)
2018 May  08.03 UT: m1=16.1 CCD, Dia.=0.26', DC=7/, ... 0.25-m f/4.7 Newton + CCD ... Sergey Shurpakov (Observatory C36, Baran', Belarus)
2012 Jan. 10.78 UT: m1=8.8, Dia.=9′, DC=3/, ... 20-cm SCT (77x) ... Juan José González (Alto del Castro – Aralla, alt. 1720 m., Leon, España) [Amplia y difusa coma elongada. Fin del crepúsculo astronómico. Altura sobre el horizonte: 12º. Cielo muy claro de montaña]
2011 Dec. 22.78 UT: m1=9.3, Dia.=9′, DC=3, ... 20-cm SCT (77x) ... Juan José González (Collada del Fresno – Sierra del Aramo, 1221 m, Asturias, España) [Significativamente más brillante que lo esperado. Amplia y difusa coma externa. Altura sobre el horizonte: 11º. Cielo muy claro de montaña]
2011 Nov. 25.37 UT: m1=12.2, Dia.=1.3′, DC=4, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan)
2011 Nov. 24.38 UT: m1=[12.1, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan)
2011 Nov. 17.78 UT: m1=12.2, Dia.=1.5′, DC=4... 20-cm SCT (133x)... Juan José González (Angliru – Sierra del Aramo, alt. 1540 m., Asturias, España) [Estrellas de comparación de la fotometría TASS. Altura sobre el horizonte: 18º. Cielo muy claro de montaña]
2005 Aug. 06.78 UT: m1=[9.5, ...  40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan) [Several faint stars exist around the position on the chart, so it was uncertain whether the comet was visible or not]
2005 Aug. 05.77 UT: m1=10.8, Dia.=1.6', DC=4, ... 32-cm L (87x) ... Yoshimi Nagai (Gunma, Japan)
2005 Aug. 05.77 UT: m1=10.4, Dia.=2.3', DC=3/, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan) [Extremely low, and the comet is very faint, so hard to see. Somewhat condensed. It was much easier to see in spring when it located high]
2005 Aug. 02.14 UT: m1=10.4, Dia.=3', DC=4, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Alto del Castro - Aralla, alt. 1720 m, Leon, North Spain)
2005 July 06.11 UT: m1=9.4, Dia.=4', DC=4, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Trichero - Soto y Amío, alt. 1190 m., León, North Spain ) [Mountain location, very clear sky. Short tail: 0.1 deg. in PA 280 deg.]
2005 July 03.11 UT: m1=9.4, Dia.=4', DC=4, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro - Aralla, alt. 1720 m, Leon, North Spain) [Mountain location, clear sky. Altitude: 11 deg.]
2005 July 02.12 UT: m1=9.7, Dia.=3', DC=4, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro - Aralla, alt. 1720 m, Leon, North Spain) [Mountain location, clear sky. Altitude: 12 deg.. Strong interference from the nearby Moon. Coma enhanced through Swan band filter]
2005 May  18.12 UT: m1=11.2, Dia.=2.5', DC=5, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Alto del Trichero - Soto y Amío, alt. 1190 m., León, North Spain ) [After moonset]
2005 May  12.83 UT: m1=11.5:, Dia.=2', DC=3, ... 25x100mm B ... Michael Mattiazzo (Stockport Observatory, South Australia)
2005 May  10.05 UT: m1=11.5, Dia.=1', DC=3, ... 30-cm L(105x) ... Marcin Filipek (Jerzmanowice, Poland)
2005 May  07.76 UT: m1=10.6, Dia.=3', DC=6, ... 46-cmL (68x) ... Shigeki Murakami (Niigata-ken, Japan)
2005 May  07.14 UT: m1=11.8, Dia.=2.3', DC=5, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Sierra del Aramo, alt. 1230 m, Asturias, North Spain )
2005 May  04.76 UT: m1=11.7:, Dia.=0.8', DC=3, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan) [Through dim clouds, so probably inaccurate. My observation on May  3 must be accurate.]
2005 May  03.74 UT: m1=12.1, Dia.=1.1', DC=4, ... 40.0-cm L f/4.5 (144x) ... Seiichi Yoshida (Gunma, Japan) [Already very bright, easy to see. The condensation is not so strong, that is very different from the cases of 78P or 9P at the beginning]
2005 May  02.15 UT: m1=12.3, Dia.=0.8', DC=6, ... 20-cm SCT (100x) ... Juan Jose Gonzalez (Sierra del Aramo, alt. 1280 m, Asturias, North Spain ) [Mountain location, very clear sky. Some moonlight interference. Motion checked during a 1-hour period]
1999 Mar. 12.79 UT: m1=13.6, Dia.=0.4', DC=3, ... 44-cm L (156x) ... Werner Hasubick (Buchloe, Germany)
1999 Mar. 12.26 UT: m1=12.5, Dia.=1.1', DC=4, ... 25.6-cm L (84x) ... Nicolas Biver (Dillingham, Oahu, HI)
1999 Mar. 09.25 UT: m1=12.6, Dia.=1.3', DC=5, ... 25.6-cm L (84x) ... Nicolas Biver (Dillingham, Oahu, HI)
1999 Mar. 07.25 UT: m1=13.5, Dia.=1.3', DC=3, ... 25.6-cm L (84x) ... Nicolas Biver (Dillingham, Oahu, HI)
1999 Feb. 17.54 UT: m1=12.2, Dia.=2.1', DC=4, ... 41-cm L ... Andrew Pearce (Dowerin, Western Australia)
1999 Feb. 16.31 UT: m1=11.7, Dia.=1.5', DC=3, ... 25.6-cm L (42x) ... Nicolas Biver (Mokuleia, Oahu, HI)
1999 Jan. 21.55 UT: m1=11.6, Dia.=1.4', DC=3, ... 41-cm reflector ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 20.55 UT: m1=11.6, Dia.=1.8', DC=3, ... 41-cm L ... Andrew Pearce (Nedlands,Western Australia)
1999 Jan. 19.74 UT: m1=11.5, Dia.=0.9', DC=3, ... 44-cm L (156x) ... Werner Hasubick (Buchloe, Germany)
1999 Jan. 19.51 UT: m1=11.2, Dia.=2', DC=4, ... 20-cm L(45x) ... Michael Mattiazzo (Wallaroo, South Australia)
1999 Jan. 18.58 UT: m1=11.6, Dia.=1.6', DC=2/, ... 41-cm L ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 17.02 UT: m1=11.1, Dia.=1.5', DC=3, ... 25.4-cm SCT (63x) ... Paulo M. Raymundo (Salvador, Brazil)
1999 Jan. 16.54 UT: m1=11.5, Dia.=1.5', DC=3, ... 41-cm L ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 14.50 UT: m1=11.0, Dia.=2', DC=3, ... 20-cm L(45x) ... Michael Mattiazzo (Wallaroo, South Australia)
1999 Jan. 14.28 UT: m1=10.9, Dia.=3.0', DC=5, Tail= 4' in PA: 50 deg., ... 25.6-cm L (42x) ... Nicolas Biver (Dillingham, Oahu, HI)
1999 Jan. 12.56 UT: m1=11.4, Dia.=1.8', DC=3/, ... 41-cm L ... Andrew Pearce (Nedlands,Western Australia)
1999 Jan. 12.51 UT: m1=11.0, Dia.=2', DC=3, ... 20-cm L(45x) ... Michael Mattiazzo (Wallaroo,South Australia)
1999 Jan. 12.26 UT: m1=10.8, Dia.=2.7', DC=5, Tail= 4' in PA: 55 deg., ... 25.6-cm L (42x) ... Nicolas Biver (Dillingham, Oahu, HI)
1999 Jan. 11.57 UT: m1=11.3, Dia.=1.6', DC=3/, ... 41-cm L ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 11.50 UT: m1=11.0, Dia.=2', DC=3, ... 20-cm L(45x) ... Michael Mattiazzo (Wallaroo, South Australia)
1999 Jan. 11.46 UT: m1=10.6, Dia.=3', DC=3, ... 11-cm L (16x) ... Stuart Rae (Te Awamutu, New Zealand)
1999 Jan. 10.61 UT: m1=11.3, Dia.=1.6', DC=3, ... 41-cm L ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 09.59 UT: m1=11.2, Dia.=1.5', DC=3, ... 41-cm L ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 07.59 UT: m1=11.0, Dia.=1.6', DC=3/, ... 41-cm L ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 07.41 UT: m1=11.0, Dia.=2.5', DC=4, ... 11-cm L (16x) ... Stuart Rae (Te Awamutu, New Zealand)
1999 Jan. 06.73 UT: m1=11.5, Dia.=0.5', DC=5, ... 44-cm L (63x) ... Werner Hasubick (Buchloe, Germany)
1999 Jan. 06.70 UT: m1=11.0, Dia.=2.0', DC=3, ... 13-cm R (35x+70x) ... Wolfgang Vollmann (Payerbach, Austria)
1999 Jan. 06.54 UT: m1=11.0, Dia.=1.8', DC=4, ... 41-cm L ... Andrew Pearce (Nedlands, Western Australia)
1999 Jan. 06.43 UT: m1=10.3, Dia.=3', DC=4, ... 11-cm L (16x) ... Stuart Rae (Te Awamutu, New Zealand) [Comet continues to change quickly. Has faded significantly since last night.]
1999 Jan. 05.40 UT: m1=9.5:, Dia.=3.5', DC=5, ... 11-cm L (16x) ... Stuart Rae (Te Awamutu, New Zealand) [Uncertainty due to discrepancies in comparison stars and close proximity to a mag 5 star.]
1999 Jan. 04.39 UT: m1=9.3:, Dia.=3.5', DC=4/, ... 11-cm L (16x) ... Stuart Rae (Te Awamutu, New Zealand) [Not entirely confident of observation. Conditions poor and comet hard to see]
1998 Nov. 24.73 UT: m1=9.2:, Dia.=4', DC=4, ... 20-cm L (40x) ...  Alexandr Baransky (Observatory of Kyiv University, Ukraine) [Comet was near the Moon]
1998 Nov. 24.47 UT: m1=9.1, Dia.=3', DC=5, ... 20-cm L(x45) ... Michael Mattiazzo (Wallaroo, South Australia) [moonlight interference]
1998 Nov. 23.74 UT: m1=9.4, Dia.=3.7', DC=2/, ... 20-cm L (40x) ... Alexandr Baransky (Observatory of Kyiv University, Ukraine)
1998 Nov. 22.70 UT: m1=9.2, Dia.=4', DC=4, ... 20-cm L (40x) ... Alexandr Baransky (Observatory of Kyiv University, Ukraine)
1998 Nov. 21.81 UT: m1=9.5, Dia.=2', DC=2, ...  20-cm SCT (80x) ... Jose J. Chambo (Hoya Redonda, Valencia, Spain)
1998 Nov. 20.73 UT: m1=9.0:, Dia.=4', DC=3, ... 11-cm L (45x) ... Alexandr Baransky (Observatory of Kyiv University, Ukraine)
1998 Nov. 13.12 UT: m1=8.8, DC=3/, ... 20x80 B ... Charles S. Morris (Fillmore, CA) [Significantly fainter than C/1998 U5.]
1998 Nov. 12.98 UT: m1=8.5, Dia.=5', DC=4, ... 20x80 B ... J. Bortle (Stormville, NY)
1998 Nov. 12.74 UT: m1=9.0, Dia.=3.0', DC=D4, ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1998 Nov. 11.98 UT: m1=8.6, Dia.=5.5', DC= 5, ... 20x80 B ... J. Bortle (Stormville, NY) [41-cmL@70x gives m1=9.0, Dia.=2.3', DC=5-6, indications of a vague, faint tail to the ENE]
1998 Nov. 11.73 UT: m1=9.3, Dia.=3', DC=7, ... 15-cm R f/15 (141x) ... A. Diepvens (Balen, Belgium)
1998 Nov. 08.80 UT: m1=9.0, Dia.=4', DC=4, ... 21-cm L (60x) ... J. Carvajal (Madrid, Spain)
1998 Nov. 08.44 UT: m1=9.1, Dia.=2.5', DC=5, ... 20-cm L(x45) ... Michael Mattiazzo (Wallaroo, South Australia)
1998 Nov. 07.98 UT: m1=8.6, Dia.=6', DC=5, ... 20x80 B ... J. Bortle (Stormville, NY)
1998 Nov. 07.74 UT: m1=9.3, Dia.=2.9', DC=4, ... 25.4-cm L (65x) ... Maik Meyer (Frauenstein, Germany)
1998 Nov. 07.73 UT: m1=9.2, Dia.=2.3', DC=5, ... 13-cm R (35x) ... Wolfgang Vollmann (Payerbach, Austria)
1998 Nov. 07.23 UT: m1=9.2, Dia.=4.5', DC=6, Tail= 12' in PA: 65 deg., ... 25.6-cm L (42x) ... Nicolas Biver (Mokuleia, Oahu, HI)
1998 Nov. 06.80 UT: m1=8.8, Dia.=3', DC=4/, ... 10-cm R (27x) ... J. Carvajal (Madrid, Spain)
1998 Nov. 06.02 UT: m1=8.5, Dia.=5', ... 11x80 B ... Jose Guilherme de S. Aguiar (Campinas, S.P, Brazil)
1998 Nov. 05.98 UT: m1=8.8, Dia.=5.5', DC=5, ... 20x80 B ... J. Bortle (Stormville, NY) [With a 41-cmL@70x m1=9.2, Dia.=2.7', DC=5/6, Tail= 0.05 deg. in p.a. 055 degrees, coma strongly elongated in p.a. 055-235 with condensation offset sunward.]
1998 Nov. 02.97 UT: m1=9.4, Dia.=1', DC=4, Tail= no tail seen, ... 15-cm L ... Gregorio Drayer (Caracas, Venezuela) [There was water vapor in the atmosphere reflecting the Moon's light.]
1998 Nov. 02.02 UT: m1=8.5, Dia.=3&, ... 11x80 B ... Jose Guilherme de S. Aguiar (Campinas, S.P, Brazil)
1998 Nov. 01.98 UT: m1=9.3, Dia.=3', DC=4, Tail= 5' in PA: 75 deg., ... 15-cm L ... Gregorio Drayer (Caracas, Venezuela) [Diffuse nucleus, I noticed a change of position relative to background stars in 30 minutes ~1' in PA~120 deg. The Moon didn't let me continue because of light interference.]
1998 June 21.25 UT: m1=14.5 CCD, Dia.=1', DC=1, ... 45-cm CASS/ST6 ... Tom Johnston (Sommers-Bausch Observatory, Boulder, CO) [Deep image shows a hint of a fan tail]
1998 May  28.25 UT: m1=15.2 CCD, Dia.=30", DC=1, ... 31.25-cm L /ST7 ... Tom Johnston (Views Brothers Observatory, Luna Lake, AZ)

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