C/2017 S3 (PANSTARRS)

Lightcurve until after August 2.15

C/2017 S3 (PANSTARRS)   - in disintegration
Reported observations:
2018 Nov. 16.22 UT: m1=10.0:, Dia.=9', DC=1/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada del Fresno - Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10' N, 5º 54' W) [What seems to be the brightest area of the remnant is close to the MPC ephemeris position, with geometric center located approximately at R.A.=13h24m, Decl.=+24o10', motion checked for a 120-min period consistent with the ephemeris. The magnitude estimate refers to this 9' brighter area, as on the previous observations. A more detailed inspection of the surrounding 1.2 degree field shows a wide and very diffuse extension of the remnant, elongated along the direction of the orbit, with a complex heterogeneous morphology of the brightness distribution, making impossible the determination of an approximate total magnitude. Nearby field stars checked in DSS. Limiting stellar magnitude fainter than 14.1 (GSC). Altitude: 29 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.6 (21.2 at zenith). Mountain location, very clear sky]
2018 Nov. 13.20 UT: m1=9.9, Dia.=8', DC=1/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada del Fresno - Sierra del Aramo, Asturias, Spain. Alt. 1280 m, 43º 10' N, 5º 54' W) [Remnant close to the ephemeris position.  Motion detected for a 120-min period. Nearby field stars checked in DSS. Limiting stellar magnitude fainter than 13.5 (GSC). Altitude: 23 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7 (21.2 at zenith). Mountain location, very clear sky]
2018 Nov. 09.23 UT: m1=10.1, Dia.=8', DC=1/, ... 20-cm SCT(77x) ... Juan Jose Gonzalez (Collada del Fresno - Sierra del Aramo, Asturias, Spain. Alt. 1221 m, 43º 10' N, 5º 54' W) [Remnant close to the ephemeris position, appearing large and very diffuse. Nearby field stars checked in DSS. Altitude: 27 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.5 (21.2 at zenith). Mountain location, very clear sky]
2018 Oct. 20.22 UT: m1=9.8, Dia.=3.5', DC=2, ... 20-cm SCT(100x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain. Alt. 1720 m, 42º 54' N, 5º 48' W) [Remnant close to the ephemeris position. Nearby field stars checked in DSS. Beginning of astronomical twilight. Altitude: 14 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.8 (21.4 at zenith). Mountain location, very clear sky]
2018 Oct. 16.22 UT: m1=9.7, 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) [Remnant close to the MPC ephemeris position. Low altitude didn't allow to make a more detailed inspection of the surrounding field. Nearby field stars checked in DSS. Beginning of astronomical twilight. Altitude: 11 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 20.7 (21.4 at zenith). Mountain location, very clear sky]
*2018 Aug. 02.15 UT: m1=7.9, 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) [Coma elongated in PA 320 deg. No observable central condensation. Motion obvious, followed for a 60-min period. Beginning of astronomical twilight. Moonlight interference (phase 0.76). Comparison stars at the same low altitude (14º) as the comet. Limiting stellar magnitude fainter than 11.7 (TK). Sidgwick method. Tycho-2 comparison stars. SQM : 19.5. Mountain location, very clear sky. SQM: 20.0 at zenith, moonlight]
2018 July 25.97 UT: m1=9.6, Dia.=3', DC=2/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Lm=5.73]
2018 July 23.86 UT: m1=11.5 CCD, Dia.=0.88', DC=6, ... 0.20-m f/4 Schmidt-Newton + CCD ... Sergey Shurpakov (Observatory A98, Baran', Belarus)
2018 July 23.47 UT: m1=8.5, Dia.=5', DC=3, ... 20x80 B ... Man To Hui (Mt. Pinos, CA, USA)
2018 July 23.13 UT: m1=8.6, Dia.=5', DC=3, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España) [no tail]
2018 July 22.90 UT: m1=9.9, Dia.=4', DC=2/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2018 July 22.08 UT: m1=8.1, Dia.=6', DC=5, ... 25x100 B ... Juan Jose Gonzalez (Quintanilla de los Oteros, Leon, Spain. Alt. 860 m, 42º 19' N, 5º 24' W) [Fading from previous outburst. Altitude: 20 deg.In 20 cm SCT (77x) : m1=8.5, Dia.=4', DC=4. Sidgwick method. Tycho-2 comparison stars. SQM: 21.0]
2018 July 22.08 UT: m1=8.5, 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)
2018 July 21.43 UT: m1=9.8, Dia,=5', DC=2/, ... 41-cm L (70x) ... Alan Hale (Cloudcroft, New Mexic, USA)
2018 July 21.02 UT: m1=7.7, Dia.=9', DC=3/, ... 10x50 B .... Maik Meyer (Frauenstein, Germany)
2018 July 20.00 UT: m1=7.0, Dia.=7.5', DC=D6, ... 10x50 B ... Maik Meyer (Frauenstein, Germany)
2018 July 19.87 UT: m1=7.3, Dia.=5.5', DC=6, ... 6-cm B (20x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Lm=6.23]
2018 July 19.86 UT: m1=7.4, Dia.=5', DC=6, ... 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2017 July 19.14 UT: m1=7.3, Dia.=4', DC=4, ... 20x60 B ... José J. Chambó (Vallés, España)
2018 July 19.12 UT: m1=7.5, Dia.=5', DC=5, ... 8-cm B(11x) ... Carlos Labordena (Castellón, España) [no tail]
2018 July 19.02 UT: m1=6.9, Dia.=7.5', DC=D5/, ... 10x50 B ... Maik Myer (Limburg, Germany)
2018 July 18.88 UT: m1=7.4, Dia.=6', DC=5/, ... 6-cm B (20x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone, Lm=6.19]
2018 July 17.98 UT: m1=7.3, Dia.=5', DC=6/, ... 10x50 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [After new outburst. Morris method]
2018 July 17.98 UT: m1=7.4, Dia.=5', DC=6, ... 25x100 B ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [After new outburst. Morris method]
2018 July 17.98 UT: m1=7.9, Dia.=4.5', DC=5/, Faint Ion Tail= 0.6 deg. in PA: 300 deg., ... 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: 21.0]
2018 July 17.95 UT: m1=7.4, Dia.=5.5', DC=D5, ... 12.0-cm R f:5 (30x) ... Maik Meyer (Eppenrod, Limburg, Germany) [very bright, looks like a globular cluster]
2018 July 17.87 UT: m1=7.7, Dia.=5', DC=5, ... 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2018 July 17.44 UT: m1=8.2, Dia,=5’, DC=5, ... 10x50 B ... Alan Hale (Cloudcroft, New Mexic, USA)
2018 July 16.00 UT: m1=8.2, Dia.=4.7', DC=6, ... 20x80 B ...Marek Biely (Brno, 244 m.a.s.l.,Czech Republic) [Already bright. Elongated and very well condensed coma]
2018 July 15.08 UT: m1=9.8, Dia.=4', DC=3, ... 20-cm T(80x) ... Carlos Labordena (Castellón, España) [no tail]
2018 July 13.92 UT: m1=10.6, Dia.=3.5', DC=3, ... 60-cm L (81x) ... Sandor Szabo (Sopron, Hungary)
2018 July 13.70 UT: m1=10.2, Dia.=3.5', DC=3/, ... 40.0-cm L f/4.5 (75x) ... Seiichi Yoshida (Gunma, Japan)
2018 July 12.87 UT: m1=10.3, Dia.=3.5', DC=1/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [method S, green zone]
2018 July 09.93 UT: m1=9.5, Dia.=4.5', DC=2, ... 20-cm SCT (77x) ... Juan Jose Gonzalez (Alto del Castro, Leon, Spain; Alt. 1720 m, 42º 54' N, 5º 48' W) [Altitude: 15 deg. Sidgwick method. Tycho-2 comparison stars. SQM: 21.2]
2018 July 09.93 UT: m1=10.0, Dia.=3.4', DC=1/, ... 25.4-cm L (120x) ... Alexsandr Morozov (Novozybkov, Russia) [Method S, green zone]
2018 July 09.04 UT: m1=9.8, Dia.=2.6’, DC=1, ... 10-cm L (55x) ... Gábor Sánta (Göd, county Pest, Hungary) [h= 37 deg., NELM= 4,5. Coma is very-very diffuse! Crescent moon is over horizon, disturbing observation]
2018 July 07.02 UT: m1=9.1, Dia.=5', DC=3, ... 20-cm T(50x) ... Carlos Labordena (Castellón, España)
2018 July 06.90 UT: m1=9.8, Dia.=5, DC=0/, ... 15-cm L f:5 (50x) ... Artyom Novichonok (Simeiz Observatory, Crimea)
2018 July 05.99 UT: m1=9.5, Dia.=5', DC=3, ... 20-cm T(50x) ... Carlos Labordena (Castellón, España)
2018 July 05.90 UT: m1=9.5, Dia.=4.3, DC=1/, ... 15-cm L f:5 (50x) ... Artyom Novichonok (Simeiz Observatory, Crimea) [The comet clearly becomes a more diffuse object. Today, despite the absence of the moon, can be seen with difficulty]
2018 July 05.02 UT: m1=9.0, Dia.=3.8', DC=4, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
2018 July 04.90 UT: m1=9.1, Dia.=3.9, DC=2/, ... 15-cm L f:5 (50x) ... Artyom Novichonok (Simeiz Observatory, Crimea) [The moon is 4 degrees above the horizon]
2018 July 04.87 UT: m1=9.1, Dia.=3.5', DC=5, ... 25.4-cm L (48x) ... Alexsandr Morozov (Novozybkov, Russia) (Method S, green zona pollution)
2018 July 03.95 UT: m1=9.0, Dia.=5', DC=3/, ... 25x100 B ... Juan Jose Gonzalez (Villar del Yermo, Leon, Spain; Alt. 805 m, 42º 20' N, 5º 42' W) [In outburst. In 20 cm SCT (77x) : m1=9.1, Dia.=5', DC=3. Sidgwick method. Tycho-2 comparison stars. SQM: 20.5]
2018 July 03.92 UT: m1=9.0, Dia.=4.0', DC=4, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
2018 July 03.85 UT: m1=9.3, Dia.=3.5, DC=3/, ... 15-cm L f:5 (50x) ... Artyom Novichonok (Simeiz Observatory, Crimea) [Bright moon in a few degrees above the horizon]
2018 July 02.94 UT: m1=9.2, Dia.=4', DC=2, ... 15x70 B ... Stephen McCann (Southampton, UK) [Small amount of twilight, due to my northerly location]
2018 July 02.92 UT: m1=9.1, Dia.=4.0', DC=4, ... 25x100 B ... Martin Lehky (Hradec Kralove, Czech Republic)
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