67P/Churyumov-Gerasimenko

67P/Churyumov-Gerasimenko
Reported observations:
2015 Nov. 20.73 UT: m1=12.5, Dia.=1.6′, DC=3 ... 40.0-cm L f/4.5 (144x)... Seiichi Yoshida (Gunma, Japan)
2015 Nov. 12.09 UT: m1=13.3, Dia.=0.9′, DC=3, Tail= 1.2’ long to PA: 160 deg ... 60.3-cm L (305x)... Sandor Szabo (Sopron, Hungary)
2015 Oct. 15.14 UT: m1=11.7, Dia.=1.3′, DC=3 ... 20-cm SCT (100x)... Juan José González (Alto del Castro, alt. 1720 m, León, España) [Altura sobre el horizonte: 16º. Estrellas de comparación tomadas de la fotometría APASS cercana al cometa. Cielo muy claro de montaña]
2015 Oct. 11.78 UT: m1=13.0, Dia.=1.0′, DC=3 ... 40.0-cm L f/4.5 (144x)... Seiichi Yoshida (Gunma, Japan)
2015 Sep. 28.48 UT: m1=11.8: CCD, Dia.=&1.4′, Tail=&1.5′ in PA: 305 deg ... [T20] 0.1-m f/5.0 astrograph + CCD... A. Novichonok & T. Prystavskiv(iTelescope observatory, H06 remotely from Mayhill, U.S.A.) [interference by Moon: Moon phase 1.00, altitude 23 deg.]
2015 Sep. 25.50 UT: m1=11.5, Dia.=0.8′, DC=5 ... 35.5-cm (93x)... Carl Hergenrother (Tucson, AZ, USA)
2015 Sep. 21.77 UT: m1=11.1, Dia.=1.6′, DC=5 ... 40.0-cm L f/4.5 (144x)... Seiichi Yoshida (Gunma, Japan)
2015 Sep. 18.13 UT: m1=11.6, Dia.=1.2′, DC=4 ... 32.0-cm L f/5 (96x)... Uwe Pilz (Leipzig, Germany)
2015 Sep. 13.48 UT: m1=12.0 CCD, Dia.=1.4′, Tail= 4.0′ in PA: 287 deg ... [T20] 0.1-m f/5.0 astrograph + CCD... A. Novichonok & T. Prystavski (iTelescope observatory, H06 remotely from Mayhill, U.S.A.)
2015 Sep. 13.10 UT: m1=12.5, Dia.=1.0′, DC=5 ... 60.3-cm L (87x)... Sandor Szabo (Sopron, Hungary) [Tail is 1’ long to the East, starlike false nuceus is 14.5 mag]
2015 Sep. 08.16 UT: m1=11.2, Dia.=1.1′, DC=5 ... 20-cm SCT (100x)... Juan José González (Alto del Castro, alt. 1720 m, León, España) [Cierta interferencia de la luz lunar. Altura sobre el horizonte: 20º. Cielo muy claro de montaña]
2015 Aug. 26.46 UT: m1=11.9: CCD, Dia.=&1.4′, Tail= 2.4′ in PA: 278 deg ... [T20] 0.1-m f/5.0 astrograph + CCD... A. Novichonok & T. Prystavski (iTelescope observatory, H06 remotely from Mayhill, U.S.A.)
2015 Aug. 23.84 UT: m1=12.1 (Tri-G), Dia.=1.0′ ... Nikon 5200 + 135-mm lens... Artyom Novichonok (Konchezero, Russia)
2015 Aug. 21.09 UT: m1=11.4, Dia.=1.5′, DC=3, Tail=—- PA: 342 deg ... 32.0-cm L f/5 (120x)... Uwe Pilz (Leipzig, Germany)
2015 Aug. 19.17 UT: m1=12.2, Dia.=0.7′, DC=5 ... 20-cm SCT (133x)... Juan José González (Cueto Rosales, alt. 1420 m, León, España) [Movimiento seguido durante 30 minutos. Estrellas de comparación de la fotometría APASS cercana al cometa. Estrellas de campo comprobadas en el DSS. Luz Zodiacal. Comienzo del crepúsculo astronómico. Altura sobre el horizonte: 23º. Cielo muy claro de montaña]
2015 Aug. 16.97 UT: m1=12.2 CCD, Dia.=0.7′, Tail= 0.6′ in PA: 284 deg ... 0.07-m f/6 refractor + CCD... A. Novichonok, K. Nezgovorov & T. Prystavski (Petrozavodsk State University Observatory, C30 Sheltozero Stn., Russia)
2015 Aug. 15.08 UT: m1=12.8, Dia.=0.8′, DC=4 ... 60.3-cm L (187x)... Sandor Szabo (Sopron, Hungary)
2015 Aug. 13.80 UT: m1=12.4, Dia.=0.8’, DC=3/ ... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [Close to mag 12.2 star, 0.8’ away in P.A. 253°. Coma diffuse with moderately condensed centre, does not enhance in Swan Band filter, no Tail. Low altitude – 12.4°, slight twilight and zodiacal light interference]
2015 Aug. 11.79 UT: m1=12.6, Dia.=1.0’, DC=3 ... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [Coma small, circular in appearance and diffuse with slightly brighter central condensation. No Tail. Low altitude = 11.3°. Moonlight, zodiacal light interference. Coma does not enhance in Swan Band filter]
2015 July 26.84 UT: m1=13.4: CCD, Dia.=&0.3′ ... [T31] 0.50-m f/6.8 astrograph + CCD + focal reducer... A. Novichonok & T. Prystavski (iTelescope observatory, Q62 remotely from Siding Spring, Australia) [morning twilight: Sun alt. -11 deg.]
2015 July 22.05 UT: m1=13.1, Dia.=0.6′, DC=4 ... 60.3 -cm L (244x)... Sandor Szabo (Sopron, Hungary)
2015 June 27.81 UT: m1=14.0, Dia.=0.6’, DC=2/ ... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [Coma very diffuse, difficult due to seeing conditions and zodiacal light interference... limiting magnitude= 14.5. Opaque inner coma, even surface brightness with faint outer coma. Altitude = 20.9°]
2015 June 22.81 UT: m1=14.2, Dia.=0.5’, DC=2/ ... 25-cm L f:5 (83x)... Chris Wyatt (Walcha, NSW, Australia) [Very difficult... zodiacal light ineteference, limiting magnitude= 14.5. Observed over a split 35 minute period, visible in good seeing. Altitude= 21.3°]
2015 May  05.77 UT: m1=[13.0... 25-cm L f:5 (83x) ... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Fainter than mag 13 star. Altitude = 12.1°... Limiting magnitude = 13.0. Conditions clear with below average seeing at comet altitude]
2010 Feb. 20.38 UT: m1=18.4 CCD, Dia.=0.70′, DC=0/ ... 0.36-m L f/3.8 + CCD... Sergey Shurpakov (Baran’, Belarus)
2003 Mar. 04.33 UT: m2=15.6 CCD, Dia.=n/a, DC=3/9 ... 0.41-m SCT/CCD ... P. Clay Sherrod (ASO - Conway, AR) [Estimates made in high haze and poor conditions; comet is very difficult due to large and diffuse coma; m2 possible only]
2003 Feb. 11.42 UT: m1=14.9 CCD, Dia.=21" irreg., DC=7/9 ... 0.41-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [An incredibly interesting sight, with the coma seemingly with a very irregular perimeter and even some streaming in random direction; not scatter nor noise; very condensed with stellar nucleus]
2003 Feb. 04.42 UT: m1=15.4 CCD, Dia.=14", DC=5/9 ... 0.41-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [Very clear tail on CCD images, in PA 300 degd, for over 1.7' length; comet is showing a much higher degree of condensation and nucleus is becoming quite stellar]
2003 Jan. 27.38 UT: m1=15.4 CCD, Dia.=0.21', DC=3/9 ... 0.41-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [Very little change; uniform and round]
2003 Jan. 22.40 UT: m1=15.0 CCD, Dia.=~14", DC=4/9 ... 0.41-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [Close gibbous moonlight hampers measurements; however coma appears consistent in spite, with some slight central conds]
2003 Jan. 15.45 UT: m1=14.7 CCD, Dia.=0.2', DC=3/9 ... 0.41-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [Failry large, open and evenly diffuse]
2003 Jan. 12.45 UT: m1=13.3 CCD, Dia.=15", DC=6/9 ... 0.41-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [Imaged as thick clouds came in, poor conditions for size, mag. estimates]
2003 Jan. 07.43 UT: m1=14.9 CCD, Dia.=1.0', DC=5/9 ... 0.31-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [Large and very open (*m2= 16.4CCD)]
2003 Jan. 03.45 UT: m1=15.6 CCD, Dia.=14", DC=4/9 ... 0.31-m SCT/CCD ... P. Clay Sherrod (ASO - Conway) [Comet is fairly large, but very diffuse and faint; could easily be missed as it is nearly transparent through coma with very little central condensation]
2002 Nov. 07.11 UT: m1=12.9, Dia.=0.7', DC=3 ... 20.3-cm L (108x) ... Piotr Guzik (Krosno, Poland) [Comet has faded and become more diffuse since previous observation]
2002 Oct. 19.14 UT: m1=12.6, Dia.=0.8', DC=5 ... 20.3-cm L (108x) ... Piotr Guzik(Krosno, Poland) [The comet looks like month ago; small condensed object]
2002 Sep. 12.09 UT: m1=12.6, Dia.=0.7', DC=4 ... 20.3-cm L (108x) ... Piotr Guzik(Krosno, Poland) [Easy, quite condensed object, brighter than suspected. Very good conditons, NEL=6.2 near this comet]

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