* * * * * C/2015 G2 (MASTER) * * * * *

Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2015 10 11.77 S 14.5 AU 40.0L 257 0.4 2 YOS Kita-karuizawa, Gunma (Near limit.) 2015 6 21.91 S 9.0 TK 22.0L 60 3 4 GOI Araçatuba (Nautical twilight, moonlight.) 2015 6 20.34 M 9.0 TK 40.6L 76 2.0 4 CAM Warners Bay, NSW 2015 6 13.92 S 8.2 TK 10.0B 20 3.5 4 GOI Araçatuba 2015 6 12.93 S 8.0 TK 10.0B 20 4 3/ GOI Araçatuba 2015 6 11.92 S 8.0 TK 10.0B 20 4 4 GOI Araçatuba 2015 6 10.35 M 8.3 TK 25.0L 39 3.7 5/ 4.5m 127 WYA Walcha, NSW (Faint transparent tail visible. Coma shows diffuse edges. Bright opaque centre, pale blue in colour, almost stellar.) 2015 6 9.35 S 8.3 TK 20.3L 62 3.0 5 CAM Warners Bay, NSW 2015 6 8.38 S 8.2 TK 20.3L 62 2.5 4/ CAM Warners Bay, NSW 2015 6 7.92 S 7.5:TK 10.0B 20 5 4 GOI Araçatuba (Comet very near a star cluster.) 2015 6 7.38 S 8.3 TK 20.3L 62 2.5 4 CAM Warners Bay, NSW 2015 6 7.34 M 8.0 TK 25.0L 39 3.8 5/ 5m 125 WYA Walcha, NSW (Inner coma bright and opaque, well condensed, outer coma faint and transparent. Coma enhances in Swan Band filter.) 2015 6 6.35 S 8.2 TK 8.0R 36 3.0 4 CAM Warners Bay, NSW 2015 6 5.35 S 8.2 TK 20.3L 62 2.0 5 CAM Warners Bay, NSW 2015 6 4.35 S 8.4 TK 40.6L 76 2.5 5 CAM Warners Bay, NSW 2015 6 4.33 M 7.9 TK 25.0L 39 3.5 5 5m 132 WYA Walcha, NSW (Slight twilight interference. Coma dims slightly using Swan Band filter. Outer coma diffuse brightening to an opaque inner coma, almost stellar. Short broad tail.) 2015 6 3.35 S 8.0 TK 20.3L 62 2.5 4 CAM Warners Bay, NSW 2015 6 1.35 M 8.0 TK 25.0L 39 2.8 5 WYA Walcha, NSW (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 5 29.35 S 6.9 TK 8.0B 20 4.0 4 CAM Warners Bay, NSW 2015 5 28.36 S 6.8 TK 8.0B 20 4.0 4 CAM Warners Bay, NSW 2015 5 26.94 S 6.7 TK 10.0B 20 8 4/ GOI Araçatuba (Moonlight.) 2015 5 26.93 S 6.6 TK 5.0B 7 9 4 GOI Araçatuba (Moonlight.) 2015 5 25.92 S 6.5 TK 5.0B 7 9 4 GOI Araçatuba (Moonlight.) 2015 5 24.36 S 6.6 TK 8.0B 20 6.0 4/ CAM Warners Bay, NSW 2015 5 23.94 S 6.4 TK 5.0B 7 10 4 GOI Araçatuba (Moonlight.) 2015 5 23.94 S 6.5 TK 10.0B 20 8 4/ GOI Araçatuba (Moonlight.) 2015 5 23.36 S 6.5 TK 8.0R 15 7.0 6 CAM Warners Bay, NSW 2015 5 22.92 S 6.4 TK 5.0B 7 10 4/ GOI Araçatuba (Moonlight.) 2015 5 18.35 M 6.2 TK 5.0B 7 14 6 WYA Walcha, NSW (Outer coma diffuse, opaque inner coma with bright and stellar central condensation, pale green in colour.) 2015 5 16.37 S 6.0 TK 8.0B 20 8.0 6 CAM Warners Bay, NSW 2015 5 16.35 S 6.1 AA 5.0B 10 12 5 SEA Cowra, NSW 2015 5 14.35 S 6.0 TK 8.0B 20 8.0 6 CAM Warners Bay, NSW 2015 5 14.35 M 6.0 TK 5.0B 7 14 6 WYA Walcha, NSW (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. Central condensation enhances strongly in Swan Band filter, outer coma only slightly enhances, inner coma is a pale blue-green colour. Through the 11x70B there appears to be an elongation or extension of the coma ~7 in length to the South approximately, no definite tail visible. Through the 25.0L at 39x an ion tail can be traced to 40 in length in p.a. 170 deg., although very thin, faint and transparent.) 2015 5 13.81 S 6.0 TK 8.OB 20 5.0 5 CAM Warners Bay, NSW 2015 5 13.35 S 6.0 TK 8.0B 20 5.0 5 CAM Warners Bay, NSW 2015 5 12.35 M 6.1 TK 5.0B 7 15.5 6 WYA Walcha, NSW (Low altitude 8.6°. 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 25.0L at 39x, the coma has a slight tinge of green. 2015 5 11.81 S 6.0 TK 8.0B 20 5.0 6 CAM Warners Bay, NSW 2015 5 10.80 S 6.0 TK 8.0B 20 5.0 5 CAM Warners Bay, NSW 2015 5 9.80 S 6.4 TK 8.0B 20 8.0 5/ CAM Warners Bay, NSW 2015 5 9.35 aM 6.0 TK 5.0B 7 10 5 GOI Araçatuba (Moonlight. Comet altitude 16°, comparison stars altitude 19°.) 2015 5 8.80 S 6.6 TK 8.0B 20 7.0 5 CAM Warners Bay, NSW 2015 5 8.78 M 6.6 TK 5.0B 7 6.2 5/ WYA Walcha, NSW (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 5 7.80 S 6.6 TK 8.0B 20 6.0 5 CAM Warners Bay, NSW 2015 5 6.77 M 6.8 TK 5.0B 7 5.8 5/ WYA Walcha, NSW (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 5 5.76 M 6.7 TK 7.0B 11 5.2 5 WYA Walcha, NSW (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 5 1.33 S 6.9 TK 5.0B 7 8 4/ GOI Araçatuba 2015 5 1.32 M 7.0 TK 10.0B 20 6 5/ 20m 230 GOI Araçatuba 2015 4 27.72 M 7.7 TK 25.0L 39 5.3 5/ 15m 245 WYA Walcha, NSW (Faint ion tail visible, 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 4 26.77 S 7.8 TK 8.0B 20 7.0 5/ CAM Warners Bay, NSW 2015 4 26.32 S 7.5 TK 5.0B 7 5 4 GOI Araçatuba 2015 4 26.31 M 7.8 TK 10.0B 20 5 5/ 10m 240 GOI Araçatuba 2015 4 25.77 S 8.0 TK 40.6L 76 4.8 6 CAM Warners Bay, NSW 2015 4 21.32 M 8.3 TK 10.0B 20 5 5 GOI Araçatuba 2015 4 19.79 S 8.5 TK 10.0B 25 3 5/ MAT Swan Hill, VIC (In same field of view as Helix Nebula.) 2015 4 15.77 S 8.5 TK 40.6L 76 3.5 5 CAM Warners Bay, NSW 2015 4 15.74 M 8.9 TK 25.0L 39 4.2 5 WYA Walcha, NSW (Moonlight. Coma enhances strong in Swan Band filter, no tail visible. Pale aqua-blue in colour, intensity increases at centre.) 2015 4 14.77 S 8.7 TK 40.6L 76 3.5 5/ CAM Warners Bay, NSW 2015 4 13.76 S 8.8 TK 40.6L 76 3.0 4/ CAM Warners Bay, NSW 2015 4 12.76 S 8.8 TK 40.6L 76 3.0 5 CAM Warners Bay, NSW 2015 4 12.31 M 8.9 TK 22.0L 60 3 5 GOI Araçatuba (Moonlight.) 2015 4 11.76 S 9.0 TK 40.6L 76 2.5 5 CAM Warners Bay, NSW 2015 4 11.35 M 8.9 TK 22.0L 60 3 5 GOI Araçatuba (Moonlight.) 2015 4 9.75 M 9.7 TK 25.0L 39 4 5/ WYA Walcha, NSW (Moonlight. Pale aqua-blue coma has diffuse edges, gradually brightening to an almost stellar central condensation. At 83x the central condensation is faintly stellar and the outer coma appears elongated slightly to the NW. Enhances strongly in Swan Band filter.) 2015 4 8.73 M 9.9 TK 25.0L 39 2.7 5/ WYA Walcha, NSW (Moonlight. Enhances strongly in Swan Band filter. Coma diffuse with brighter, well condensed central condensation. Altitude 22.8°.)