C/2015 G2 (MASTER)

C/2015 G2 (MASTER)
Reported observations:
2015 Nov. 12.06 UT: m1=15.6, Dia.=0.3′, DC=3... 60.3-cm L (305x)... Sandor Szabo (Sopron, Hungary)
2015 Oct. 13.49 UT: m1=15.7: CCD, Dia.=&0.5′, Tail=0.9′ in PA: 283 deg.... [T20] 0.1-m f/5.0 astrograph + CCD... A. Novichonok & T. Prystavski (iTelescope observatory, H06 remotely from Mayhill, U.S.A.)
2015 Oct. 11.77 UT: m1=14.5, Dia.=0.4′, DC=2... 40.0-cm L f/4.5 (257x)... Seiichi Yoshida (Gunma, Japan)
2015 Sep. 13.48 UT: m1=15.0 CCD, Dia.=0.37′, Tail=&0.7′ in PA: 140 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. 13.12 UT: m1=13.8, Dia.=0.4′, DC=2... 60.3-cm L (244x)... Sandor Szabo (Sopron, Hungary)
2015 June 21.91 UT: m1=9.0, Dia.=3′, DC=4... 22-cm L (60X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Nautical twilight, moonlight]
2015 June 20.34 UT: m1=9.0, Dia.=2.0′, DC=4... 40.6-cm L f/4 (76x)... Paul Camilleri (Warners Bay, Australia)
2015 June 16.89 UT: m1=8.5:... 7-cm R (28x): Alexandre Amorim (Florianopolis, Brazil)
2015 June 15.89 UT: m1=8.4, Dia.=3′, DC=4... 7-cm R (28x)... Alexandre Amorim (Florianopolis, Brazil)
2015 June 13.92 UT: m1=8.2, Dia.=3.5′, DC=4... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 June 12.93 UT: m1=8.0, Dia.=4′, DC=3/... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 June 11.92 UT: m1=8.0, Dia.=4′, DC=4... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 June 10.89 UT: m1=8.0, Dia.=3′, DC=5... 7-cm R (28x)... Alexandre Amorim (Florianopolis, Brazil)
2015 June 10.35 UT: m1=8.3, Dia.=3.7’, DC=5/... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Faint transparent tail visible, 4.5’ in length in P.A. 127°... Coma shows diffuse edges, bright opaque centre, pale blue in colour, almost stellar]
2015 June 09.89 UT: m1=8.0, Dia.=3′, DC=5... 7-cm R (28x)... Alexandre Amorim (Florianopolis, Brazil)
2015 June 09.35 UT: m1=8.3, Dia.=3.0′, DC=5... 20.3-cm L f/7 (62x)... Paul Camilleri (Warners Bay, Australia)
2015 June 08.91 UT: m1=7.7, Dia.=4′, DC=5... 7-cm R (28x)... Alexandre Amorim (Florianopolis, Brazil)
2015 June 08.38 UT: m1=8.2, Dia.=2.5′, DC=4/... 20.3-cm L f/7 (62x)... Paul Camilleri (Warners Bay, Australia)
2015 June 07.92 UT: m1=7.5:, Dia.=5′, DC=4... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [very near a star cluster]
2015 June 07.38 UT: m1=8.3, Dia.=2.5′, DC=4... 20.3-cm L f/7 (62x)... Paul Camilleri (Warners Bay, Australia)
2015 June 07.34 UT: m1=8.0, Dia.=3.8’, DC=5/... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Faint tail visible, 5’ in length in P.A. 125°... Inner coma bright and opaque, well condensed, outer coma faint and transparent. Coma enhances in Swan Band filter]
2015 June 06.35 UT: m1=8.2, Dia.=3.0′, DC=4... 8-cm R f/5 (36x)... Paul Camilleri (Warners Bay, Australia)
2015 June 06.347 UT: m1=8.0, Dia.=3’, DC=5... 0.114m L f8 (43x)... Rob Kaufman (Bright, Victoria, Australia) [Brighter small central condensation, poorly-defined. No tail visible. Some LP]
2015 June 05.35 UT: m1=8.2, Dia.=2.0′, DC=5... 20.3-cm L f/7 (62x)... Paul Camilleri (Warners Bay, Australia)
2015 June 04.35 UT: m1=8.4, Dia.=2.5′, DC=5... 40.6-cm L f/4 (76x)... Paul Camilleri (Warners Bay, Australia)
2015 June 04.33 UT: m1=7.9, Dia.=3.5’, DC=5... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Slight twilight interference... Coma dims slightly using Swan Band filter, Outer coma diffuse brightening to an opaque inner coma, almost stellar. Short broad tail 5’ in length in P.A. 132° approximately]
2015 June 03.90 UT: m1=7.4, Dia.=4′, DC=6... 7cm R (28x)... Alexandre Amorim (Florianopolis, Brazil)
2015 June 03.35 UT: m1=8.0, Dia.=2.5′, DC=4... 20.3-cm L f/7 (62x)... Paul Camilleri (Warners Bay, Australia)
2015 June 02.89 UT: m1=7.2, Dia.=4′, DC=6/... 7cm R (28x)... Alexandre Amorim (Florianopolis, Brazil) [moonlight interference]
2015 June 01.35 UT: m1=8.0, Dia.=2.8’, DC=5... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Coma has diffuse edges, brightens gradually to an opaque inner coma and moderately condensed, but not stellar, central condensation. Enhances well in Swan Band filter, hint of outer coma elongation to SE and NW. No tail visible]
2015 May  29.91 UT: m1=6.7, Dia.=5′, DC=5... 10×50 B... Alexandre Amorim (Florianopolis, Brazil) [moonlight interference]
2015 May  29.91 UT: m1=7.1, Dia.=5′, DC=4... 15×70 B... Willian Souza (Sao Paulo, Brazil)
2015 May  29.35 UT: m1=6.9, Dia.=4.0′, DC=4... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  28.36 UT: m1=6.8, Dia.=4.0′, DC=4... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  27.91 UT: m1=6.9, Dia.=5′, DC=4... 15×70 B... Willian Souza (Sao Paulo, Brazil)
2015 May  26.98 UT: m1=7.8, Dia.=2′, DC=3/, Tail= no visible... 15×70 B... Roberto Condori (OAN MPC820, Tarija, Bolivia)
2015 May  26.94 UT: m1=6.7, Dia.=8′, DC=4/... 10cm B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2015 May  26.93 UT: m1=6.6, Dia.=9′, DC=4... 5cm B (7X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2015 May  25.32 UT: m1=6.6, Dia.=8.5′, DC=5... 11×70 B... Con Stoitsis (Caulfield, Victoria, Australia)
2015 May  24.36 UT: m1=6.6, Dia.=6.0′, DC=4/... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  23.94 UT: m1=6.4, Dia.=10′, DC=4... 5 B (7X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2015 May  23.94 UT: m1=6.5, Dia.=8′, DC=4/... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2015 May  23.92 UT: m1=6.5, Dia.=8′, DC=4... 10×50 B... Willian Souza (Olimpia, Brazil)
2015 May  23.90 UT: m1=6.5:, Dia.=5′, DC=5... 10×50 B... Alexandre Amorim (Florianopolis, Brazil) [close to 6.3-mag star]
2015 May  23.365 UT: m1=6.6, Dia.=8’, DC=4... 10×50 B... Rob Kaufman (Bright, Victoria, Australia] [Outer coma faint – coma brightens inwards to small brighter central condensation visible in moments of good seeing... coma appears slightly elongated to E. No tail visible. Moonlight]
2015 May  23.36 UT: m1=6.5, Dia.=7.0′, DC=6... 8-cm R (15x)... Paul Camilleri (Warners Bay, Australia)
2015 May  22.97 UT: m1=6.5, Dia.=4′, DC=4/, Tail= no visible... 15×70 B... Roberto Condori (OAN MPC820, Tarija, Bolivia)
2015 May  22.92 UT: m1=6.5, Dia.=9′, DC=5... 10×50 B... Alexandre Amorim (Florianopolis, Brazil)
2015 May  22.92 UT: m1=6.4, Dia= 10′, DC=5... 10×50 B... Willian Souza (Taquaritinga, Brazil)
2015 May  22.92 UT: m1=6.4, Dia.=10′, DC=4/... 5 B (7X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight]
2015 May  21.97 UT: m1=6.4, Dia.=3.7′, DC=4... 25cm L (66x)... Gonzalo Vargas (Cochabamba Bolivia)
2015 May  21.93 UT: m1=6.4, Dia.=8′, DC=5... 10×50 B... Alexandre Amorim (Florianopolis, Brazil)
2015 May  21.92 UT: m1=6.3, Dia.=8′, DC=5... 10×50 B... Willian Souza (Sao Paulo, Brazil)
2015 May  20.38 UT: m1=6.4, Dia.=9’, DC=4... 10×50 B... Rob Kaufman (Bright, Victoria, Australia] [Outer coma faint – coma brightens inwards... star-like central condensation faintly visible in moments of good seeing, otherwise diffuse appearance. No tail visible]
2015 May  18.96 UT: m1=5.5, Dia.=5′, DC=6/, Tail= no visible... 15×70 B... Roberto Condori (OAN MPC820 Tarija, Bolivia) [Alt:35°, * comparación HD: 36473  5.53 y HD: 35991 6.08]
2015 May  18.35 UT: m1=6.2, Dia.=14’, DC=6... 7×50 B... Chris Wyatt (Walcha, NSW, Australia) [No tail... outer coma diffuse, opaque inner coma with bright and stellar central condensation, pale green in colour]
2015 May  16.37 UT: m1=6.0, Dia.=8.0′, DC=6... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  16.365 UT: m1=6.2, Dia.=9’, DC=6... 10×50 B... Rob Kaufman (Bright, Victoria, Australia) [Outer coma faint – coma brightens inwards towards star-like central condensation. No tail visible]
2015 May  16.35 UT: m1=6.1, Dia.=12′, DC=5... 10×50 B... David A. J. Seargent (Cowra, NSW, Australia)
2015 May  14.35 UT: m1=6.0, Dia.=8.0′, DC=6... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  14.35 UT: m1=6.0, Dia.=14’, DC=6... 7×50 B... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 14.4°... Coma has diffuse edges, brightening to an opaque inner coma and small stellar centre. Close to mag 7.9 (TK) star, 6.6’ away in P.A. 047°... Central condensation enhances strongly in Swan Band filter, outer coma only slightly enhances, inner coma is a pale blue-green colour. Through the 11×70 B’s there appears to be an elongation or extension of the coma approximately 7’ in length to the South approximately, no definite tail visible. Through the 10” f/5 dob at x39 an ion tail can be traced to 40’ in length in P.A. 170°, although very thin, faint and transparent]
2015 May  13.81 UT: m1=6.0, Dia.=5.0′, DC=5... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  13.35 UT: m1=6.0, Dia.=5.0′, DC=5... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  12.36 UT: m1=6.0:, Dia.=&5′, DC=6... 15×70 B... Willian Souza (Sao Paulo, Brazil) [comet altitude ~11deg.]
2015 May  12.35 UT: m1=6.1, Dia.=15.5’, DC=6... 7×50 B... Chris Wyatt (Walcha, NSW, Australia) [Low altitude = 8.6°... No tail, coma large with diffuse outer coma, bright opaque inner coma with stellar central condensation. Coma is aqua-blue in colour, more intense in the centre... Using the 10” f/5 dob @ x39 the coma has a slight tinge of green]
2015 May  11.81 UT: m1=6.0, Dia.=5.0′, DC=6... 8-cm B (20x)... Paul Camilleri (Warners Bay, Australia)
2015 May  11.36 UT: m1=6.0, Dia.=8′, DC=6... 10×50 B... Alexandre Amorim (Florianopolis, Brazil) [nautical twilight]
2015 May  10.80 UT: m1=6.0, Dia.=5.0′, DC=5... 20x 80 B... Paul Camilleri (Warners Bay, NSW, Australia)
2015 May  10.35 UT: m1=6.0, Dia.=10′, DC=5/... 15×70 B... Willian Souza (Sao Paulo, Brazil)
2015 May  09.80 UT: m1=6.4, Dia.=8.0′, DC=5/... 20x 80 B... Paul Camilleri (Warners Bay, NSW, Australia)
2015 May  09.35 UT: m1=6.0, Dia.=10′, DC=5... 5 B (7X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [moonlight, atmospheric extinction applied – average table, comet altitude: 16º]
2015 May  09.34 UT: m1=6.0, Dia.=10′, DC=5... 10×50 B... Alexandre Amorim (Florianopolis, Brazil) [moonlight interference]
2015 May  08.80 UT: m1=6.6, Dia.=7.0′, DC=5... 20x 80 B... Paul Camilleri (Warners Bay, NSW, Australia)
2015 May  08.78 UT: m1=6.6, Dia.=6.2’, DC=5/... 7×50 B... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Coma round in appearance, faintly stellar with a bright opaque inner coma fading to a diffuse outer coma. No tail visible. Coma enhances strongly in Swan Band filter]
2015 May  07.80 UT: m1=6.6, Dia.=6.0′, DC=5... 20x 80 B... Paul Camilleri (Warners Bay, NSW, Australia)
2015 May  07.33 UT: m1=6.6:...10×50 B... Alexandre Amorim (Florianopolis, Brazil) [moonlight and nebulosity interference]
2015 May  06.77 UT: m1=6.8, Dia.=5.8’, DC=5/... 7×50 B... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Coma diffuse with bright central condensation, sometimes appears faintly stellar. No tail visible due to washed out background sky... Enhances well in Swan Band filter]
2015 May  06.34 UT: m1=6.8, Dia.=6′, DC=6... 10×50 B... Alexandre Amorim (Florianopolis, Brazil) [moonlight interference]
2015 May  05.76 UT: m1=6.7, Dia.=5.2’, DC=5... 11×70 B... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Coma round in appearance, bright central condensation but not stellar, pale aqua-blue in colour at coma edge and more intense in colour to centre, enhances strongly in Swan Band filter]
2015 May  05.34 UT: m1=7.0:, Dia.=7′, DC=6... 10×50 B... Alexandre Amorim (Florianopolis, Brazil) [moonlight and clouds interference]
2015 May  01.33 UT: m1=7.5, Dia.=9′, DC=6... 10×50 B... Alexandre Amorim (Florianopolis, Brazil)
2015 May  01.32 UT: m1=7.0, Dia.=6′, DC=5/, Tail= 20 arcmin in PA 230º... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 May  01.33 UT: m1=6.9, Dia.=8′, DC=4/... 5 B (7X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 Apr. 29.80 UT: m1=7.5, Dia.=7.5′, DC=6... 11×70 B... Con Stoitsis (Clonbinane, Victoria, Australia)
2015 Apr. 29.33 UT: m1=7.7, Dia.=3′, DC=5... 15×70 B... Willian Souza (Sao Paulo, Brazil)
2015 Apr. 28.76 UT: m1=7.6, Dia.=8’, DC=4... 10×50 B... Rob Kaufman (Bright, Victoria, Australia) [Outer coma faint – coma brightens inwards towards ill-defined central condensation. No tail visible. Altitude 29 degrees]
2015 Apr. 27.72 UT: m1=7.7, Dia.=5.3’, DC=5/... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Faint ion tail visible, traced to 15’ in length in PA 245°, 1.8’ in width. Coma shows diffuse edges and gradually brightening to a luminous pale aqua-blue inner coma with a faint stellar centre. Enhances strongly in Swan Band filter]
2015 Apr. 27.34 UT: m1=7.8, Dia.=8′, DC=5... 10×50 B... Alexandre Amorim (Florianopolis, Brazil)
2015 Apr. 26.77 UT: m1=7.8, Dia.=7.0′, DC=5/... 20x 80 B... Paul Camilleri (Warners Bay, NSW, Australia)
2015 Apr. 26.32 UT: m1=7.5, Dia.=5′, DC=4... 5 B (7X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 Apr. 26.31 UT: m1=7.8, Dia.=5′, DC=5/, Tail= 15 arcmin in PA: 240º... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 Apr. 25.77 UT: m1=8.0, Dia.=4.8′, DC=6... 40.6cm L f/4 (76x)... Paul Camilleri (Warners Bay, NSW, Australia)
2015 Apr. 25.33 UT: m1=8.0, Dia.=5′, DC=5/... 10×50 B... Alexandre Amorim (Florianopolis, Brazil)
2015 Apr. 25.32 UT: m1=8.0, Dia.=3′, DC=5/... 8-cm R f/7.5 (26x)... Willian Souza (Sao Paulo, Brazil)
2015 Apr. 24.82 UT: m2=11.5 CCD, Dia.=&9.5′, Tail=&1.1 deg in PA: 239 deg.... [T12]0.11m f/5.0 refractor + CCD... A. Novichonok & T. Prystavski (iTelescope observatory, Q62 (remotely from Siding Spring, Australia)
2015 Apr. 21.32 UT: m1=8.3, Dia.=5′, DC=5... 10 B (20X)... Marco Antonio Coelho Goiato (Araçatuba, Brazil)
2015 Apr. 19.79 UT: m1=8.5, Dia.=3′, DC=5/... 25×100 B... Michael Mattiazzo (Swan Hill, Victoria, Australia) [In same field of view as Helix Nebula. Tycho 2 VT magnitude comparisons. Sidgwick method]
2015 Apr. 16.29 UT: m1=8.8, Dia.=3′, DC=6... 8-cm R f/7.5 (40x)... Willian Souza (Sao Paulo, Brazil)
2015 Apr. 15.77 UT: m1=8.5, Dia.=3.5′, DC=5... 40.6cm L f/4 (76x)... Paul Camilleri (Warners Bay, NSW, Australia)
2015 Apr. 15.74 UT: m1=8.9, Dia.=4.2’, DC=5... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Coma enhances strong in Swan Band filter, no tail visible. Pale aqua-blue in colour, intensity increases at centre]
2015 Apr. 12.32 UT: m1=9.2, Dia.=3′, DC=4... 18cm L (57x)... Alexandre Amorim (Florianopolis, Brazil) [moonlight interference]
2015 Apr. 12.31 UT: m1=8.9, Dia.=3′, DC=5... 22-cm L (60x)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, enhanced with Swan band filter]
2015 Apr. 11.35 UT: m1=8.9, Dia.=3′, DC=5... 22-cm L (60x)... Marco Antonio Coelho Goiato (Araçatuba, Brazil) [Moonlight, clouds]
2015 Apr. 11.32 UT: m1=9.4, Dia.=2.5′, DC=5... 18cm L (57x)... Alexandre Amorim (Florianopolis, Brazil) [moonlight interference]
2015 Apr. 10.34 UT: m1=9.4, Dia.=2′, DC=5... 18cm L (45x)... Alexandre Amorim (Florianopolis, Brazil)[moonlight interference]
2015 Apr. 09.75 UT: m1=9.7... Dia.=4’, DC=5/... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Pale aqua-blue coma has diffuse edges, gradually brightening to an almost stellar central condensation. At x83 the central condensation is faintly stellar and the outer coma appears elongated slightly to the NW. Enhances strongly in Swan Band filter]
2015 Apr. 09.34 UT: m1=10.0, Dia.=1.5′, DC=6... 18cm L (45x)... Alexandre Amorim (Florianopolis, Brazil)[moonlight interference]
2015 Apr. 08.73 UT: m1=9.9, Dia.=2.7’, DC=5/... 25cm L f:5 (39x)... Chris Wyatt (Walcha, NSW, Australia) [Moonlight... Enhances strongly in Swan Band filter. Coma diffuse with brighter, well condensed central condensation. Altitude = 22.8°. No tail]