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* * * * * 48P/Johnson * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2018 12 7.45 S 13.7 AQ 25.0L 83 1 2 WYA Walcha, NSW (Very diffuse. Difficult due to scintillation due to poor seeing.) 2018 11 29.49 S 13.9 AQ 25.0L 83 0.8 3 WYA Walcha, NSW (Difficult. Very diffuse.) 2018 11 8.47 S 13.9 AQ 25.0L 83 1 2 WYA Walcha, NSW (Getting difficult to see. Coma shows a slight brightening in centre.) 2018 11 3.86 S 10.4 TK 20.3T 77 6 1/ GON Pandorado, León (Faint outer coma. Observation made under better conditions, providing a wider coma diameter and brighter m1 estimate in comparison with my previous Oct. 16 observation. Altitude 22°.) 2018 11 1.52 M 13.5 AQ 40.6L 165 1.2 3 CAM Katherine, NT 2018 10 30.41 S 13.6 AQ 25.0L 83 1.1 2/ WYA Walcha, NSW (Difficult. Diffuse with slight brightening to centre.) 2018 10 29.41 S 13.5 AQ 25.0L 83 1.2 3 WYA Walcha, NSW (Difficult. Very diffuse.) 2018 10 27.41 S 13.5 AQ 25.0L 83 1 3 WYA Walcha, NSW (Coma very small and diffuse. Difficult.) 2018 10 16.00 S 11.1 TK 20.3T 133 3 2 GON Alto del Castro, León (Altitude 12°.) 2018 10 12.45 M 12.8 AQ 40.6L 76 1.0 3/ CAM Katherine, NT 2018 10 11.60 M 12.8 AQ 40.6L 76 1.0 3 CAM Katherine, NT 2018 10 9.54 M 12.9 AQ 40.6L 165 1.0 4 CAM Katherine, NT 2018 10 8.42 M 12.9 AQ 25.0L 83 1.9 4/ WYA Walcha, NSW (Coma diffuse, brighter inner coma but moderately condensed and opaque.) 2018 10 7.55 M 12.7 AQ 40.6L 76 1.0 4 CAM Katherine, NT 2018 10 7.45 S 13.5 AU 40.0L 257 0.7 4 YOS Kita-karuizawa, Gunma (Tiny. Unexpectedly, I could see it still now.) 2018 10 6.56 M 12.6 AQ 40.6L 76 1.0 4 CAM Katherine, NT 2018 10 4.44 M 12.5 AQ 40.6L 165 1.3 4 CAM Katherine, NT 2018 10 3.93 S 10.6 TK 20.3T 77 6 1/ GON Alto del Castro, León (Altitude 20°.) 2018 10 3.55 M 12.6 AQ 40.6L 76 1.2 4 CAM Katherine, NT 2018 10 1.53 M 12.7 AQ 40.6L 76 1 4 CAM Katherine, NT 2018 10 1.41 M 12.6 AQ 25.0L 83 1.1 5/ WYA Walcha, NSW (Small opaque centre with faint stellar central condensation visible in good seeing.) 2018 9 30.45 M 12.8 AQ 40.6L 76 1 4 CAM Katherine, NT 2018 9 29.44 M 12.9 AQ 40.6L 165 1 4 CAM Katherine, NT 2018 9 28.44 M 12.9 AQ 40.6L 76 1 4 CAM Katherine, NT 2018 9 27.44 M 12.7 AQ 40.6L 165 1 4/ CAM Katherine, NT 2018 9 19.02 S 10.3 TK 20.3T 77 7 2 GON Aralla, León (Altitude 16°.) 2018 9 18.70 M 12.8 AQ 25.0L 83 1.4 6 WYA Walcha, NSW (Coma diffuse, opaque centre faintly stellar. Sky slightly hazy due to dust. Faintly visible at 39x.) 2018 9 17.65 S 13.3 AU 40.0L 144 1.0 4 YOS Kita-karuizawa, Gunma (Tiny. I felt the comet faded so much. But it was only due to the dim sky condition in the low sky.) 2018 9 14.65 M 12.6 AQ 40.6L 76 1.5 5 CAM Katherine, NT 2018 9 11.68 M 12.4 AQ 40.6L 76 1.5 5 CAM Katherine, NT 2018 9 10.39 M 12.8 AQ 25.0L 83 1.6 6 WYA Walcha, NSW (Coma diffuse, small opaque inner coma surrounding a faint stellar central condensation. Sky hazy due to dust/smoke in upper atmosphere.) 2018 9 9.98 S 10.1 TK 20.3T 77 7 2 GON Aralla, León (Altitude 19°.) 2018 9 9.72 M 13.0 AQ 25.0L 83 1.2 5/ WYA Walcha, NSW (Coma shows slight elongation to the NW approximately. Opaque centre, faintly stellar in good seeing.) 2018 9 8.40 M 12.8 AQ 25.0L 83 1.6 6 WYA Walcha, NSW (Coma edge diffuse and transparent, opaque inner coma, faint stellar central condensation.) 2018 9 7.71 M 12.9 AQ 25.0L 83 1.2 6 WYA Walcha, NSW (Coma diffuse, gradually brightening to centre, small stellar central condensation.) 2018 9 6.48 M 12.6 AQ 40.6L 165 1.5 4 CAM Katherine, NT 2018 9 5.55 M 12.4 AQ 40.6L 76 1.5 5 CAM Katherine, NT 2018 9 3.49 M 12.5 AQ 40.6L 76 1.2 4/ CAM Katherine, NT 2018 9 1.53 M 12.5 AQ 40.6L 76 1.5 5 CAM Katherine, NT 2018 8 31.52 M 12.5 AQ 40.6L 76 1.5 4 CAM Katherine, NT 2018 8 29.38 M 12.7 AQ 25.0L 83 1.8 6 WYA Walcha, NSW (Does not enhance in Swan Band filter. Faint diffuse outer coma, gradually brightening to a stellar centre.) 2018 8 20.12 S 9.6 TK 20.3T 77 7 2 GON Alto del Castro, León (Mag. 11.5 [TK] star in coma. Altitude 19°.) 2018 8 18.71 M 12.6 AQ 25.0L 83 1.5 6 WYA Walcha, NSW (Coma diffuse, opaque inner coma, stellar central condensation. Hint of tail to the NW approximately. Very windy conditions, observing at 1250m altitude.) 2018 8 15.71 M 12.5 AQ 25.0L 83 1.4 6 WYA Walcha, NSW (Does not enhance in Swan Band filter. Opaque inner coma, stellar centre, diffuse and transparent outer coma.) 2018 8 15.02 S 9.7 TK 20.3T 77 7 2 GON Alto del Castro, León (Altitude 22°.) 2018 8 14.48 M 12.4 AQ 25.0L 83 1.5 6 WYA Walcha, NSW (Outer coma diffuse, and transparent. Faint stellar central condensation.) 2018 8 13.78 M 12.5 AQ 40.6L 76 1.0 5 CAM Katherine, NT 2018 8 12.79 M 12.4 AQ 40.6L 76 1.3 5 CAM Katherine, NT 2018 8 10.79 M 12.6 AQ 40.6L 76 1.5 6 CAM Katherine, NT 2018 8 10.05 S 9.8 TK 20.3T 77 6 2 GON Alto del Castro, León (Altitude 24°.) 2018 8 9.79 M 12.6 AQ 40.6L 76 1.5 5 CAM Katherine, NT 2018 8 8.72 M 12.7 AQ 25.0L 83 1.6 6 WYA Walcha, NSW (Stellar central condensation, diffuse outer coma. Hint of tail to the NW approximately.) 2018 8 8.19 S 12.2 TK 22.0L 160 2 3 GOI Araçatuba 2018 8 8.06 S 9.7 TK 20.3T 77 6 2 GON Alto del Castro, León 2018 8 6.60 M 12.6 AQ 25.0L 83 1.3 6 WYA Walcha, NSW (Coma diffuse with faint stellar central condensation. Star on SW edge of coma. Does not enhance in Swan Band filter.) 2018 7 23.80 M 13.3 AQ 40.6L 165 1.5 4 CAM Katherine, NT 2018 7 23.75 M 13.0 AQ 25.0L 83 1.3 6 WYA Walcha, NSW (Faint short tail extension to the West approximately. Inner coma opaque with aqua-blue coloured stellar centre, diffuse outer coma. No enhancement in Swan Band filter.) 2018 7 22.80 M 13.2 AQ 40.6L 165 1.5 5 CAM Katherine, NT 2018 7 22.14 S 9.8 TK 20.3T 77 6 1/ GON Quintanilla de los Oteros, León (Observation made under better atmospheric conditions, providing a wider outer coma diameter and brighter m1 in comparison with my previous July 18.13 estimate. Altitude 20°.) 2018 7 21.79 M 13.2 AQ 40.6L 165 1.5 5 CAM Katherine, NT 2018 7 20.78 M 13.0 AQ 40.6L 165 1.0 5 CAM Katherine, NT 2018 7 20.73 M 13.0 AQ 25.0L 83 1.6 6 WYA Walcha, NSW (Close to star. Pale blue stellar centre. Diffuse outer coma.) 2018 7 18.73 M 13.2 AQ 25.0L 83 1.8 6 WYA Walcha, NSW (Stellar central condensation visible in periods of good seeing. No enhancement in Swan Band filter. Faintly visible at 39x.) 2018 7 18.13 S 10.5 TK 20.3T 77 5 1/ GON Alto del Castro, León (Faint outer coma.) 2018 7 17.79 M 13.1 AQ 40.6L 165 1.5 5 CAM Katherine, NT 2018 7 16.82 M 12.5 AQ 40.6L 165 1.5 5 CAM Katherine, NT 2018 7 16.72 M 13.3 AQ 25.0L 83 1.3 6 WYA Walcha, NSW (Does not enhance in Swan Band filter. Faint stellar central condensation, diffuse outer coma. Faint short coma extension to the West approximately.) 2018 7 13.72 M 13.0 AQ 25.0L 83 1 5/ WYA Walcha, NSW (Coma diffuse, bright opaque centre, appears faintly stellar in periods of good seeing. Close to mag 13.9 star. Faint tail noticeable extending to WSW approximately.) 2018 7 13.69 S 13.3 AU 40.0L 144 0.5 7 YOS Kita-karuizawa, Gunma (Central condensation is very sharp.) 2018 7 12.49 S 12.7 AQ 25.0L 83 1.2 3/ WYA Walcha, NSW (Diffuse coma, moderately condensed. Observed from backyard location in town. Slight smoke haze.) 2018 7 11.74 M 13.5 AQ 25.0L 83 1.2 4 WYA Walcha, NSW (Coma diffuse, moderately condensed centre. Slight interference from proximity of mag 11.6 star.) 2018 7 10.72 M 12.4 AQ 40.6L 165 1.0 5 CAM Katherine, NT 2018 6 23.76 S 14.0 AQ 40.6L 165 1.5 4 CAM Katherine, NT 2018 6 23.75 M 14.1 AQ 25.0L 83 0.7 6 WYA Walcha, NSW (Very faint stellar central condensation visible in good seeing. Diffuse outer coma.) 2018 6 22.76 M 14.0 AQ 25.0L 83 1 6 WYA Walcha, NSW (Difficult. Centre opaque, faintly stellar in good seeing. NGC 7251 in same field and a little to the SW approximately.) 2018 6 21.73 S 14.0 AQ 40.6L 165 1.5 3 CAM Katherine, NT 2018 6 19.09 S 11.5 AQ 20.3T 100 4 2 GON Alto del Castro - Aralla, León (From dark mountain skies the comet shows a large and very diffuse outer coma. Field stars checked in DSS. Altitude 22°.) 2018 6 13.75 M 14.4 AQ 25.0L 83 1.1 4 WYA Walcha, NSW (Difficult, diffuse.) 2018 6 12.73 M 14.6 AQ 25.0L 83 0.7 4 WYA Walcha, NSW (Difficult, visible in good seeing.) 2018 6 11.73 S 14.6 AQ 25.0L 83 0.8 3/ WYA Walcha, NSW (Difficult, coma diffuse with slight brightening to centre, visible in periods of good seeing.)
2011 8 1.05 S 14.2 HN 20.3T 222 0.6 6 GON Alto del Castro - Aralla, León (Nearby field stars checked in DSS. Comparison stars taken from Henden photometry near GRB030723.)