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* * * * * 117P/Helin-Roman-Alu 1 * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2022 11 23.43 M 14.7 AQ 40.0L 261 0.6 5/ WYA Walcha, NSW (Difficult due to scintillation, opaque centre.) 2022 10 14.45 M 14.7 AQ 40.0L 261 0.4 5/ WYA Walcha, NSW (Opaque centre, diffuse outer coma.) 2022 9 19.43 M 14.5 AQ 40.0L 261 0.5 4 WYA Walcha, NSW (Difficult, busy starfield.) 2022 8 20.43 M 14.3 AQ 40.0L 261 0.4 5/ WYA Walcha, NSW (Busy starfield, difficult, diffuse with faint stellar pseudo-nucleus visible.) 2022 7 29.57 M 13.5 AQ 40.0L 182 0.5 5 WYA Walcha, NSW (Diffuse, opaque centre.) 2022 7 25.49 M 13.6 AQ 40.0L 182 0.7 5/ WYA Walcha, NSW (Busy starfield, difficult.) 2022 6 24.47 M 13.6 AQ 40.0L 182 0.5 6 WYA Walcha, NSW (Hint of faint tail to the NW approx., opaque inner coma, almost stellar at centre.) 2022 6 22.49 M 13.2 AQ 40.0L 182 0.7 6 WYA Walcha, NSW (Close to star. Diffuse and opaque, small coma. Faint stellar pseudo-nucleus visible.) 2022 6 5.47 M 13.2 AQ 40.0L 182 0.8 5/ WYA Walcha, NSW (Moonlight. Transparent coma, faint stellar pseudo-nucleus visible sometimes.) 2022 5 6.75 M 14.9 AQ 40.0L 261 0.4 5/ WYA Walcha, NSW (Small coma. Busy starfield though resolvable.) 2021 6 6.40 M 15.3 AQ 40.0L 182 0.6 4 WYA Walcha, NSW (Difficult. Diffuse, slightly brighter at centre, sometimes appears faintly stellar in good seeing.) 2021 5 31.39 M 15.2 AQ 40.0L 261 0.4 6 WYA Walcha, NSW (Faint stellar pseudo-nucleus visible in good seeing. Semi-opaque outer coma.) 2021 5 19.57 M 15.1 AQ 40.0L 261 0.3 3/ WYA Walcha, NSW (Diffuse. Close to star but resolvable.) 2021 5 17.49 M 15.0 AQ 40.0L 261 0.4 4 WYA Walcha, NSW (Diffuse with opaque centre.) 2021 5 13.44 M 15.2 AQ 40.0L 261 0.4 5/ WYA Walcha, NSW (Difficult, visible in good seeing. Opaque centre.)
2014 10 25.41 S 13.5 AU 40.0L 257 0.5 3 YOS Kita-karuizawa, Gunma (Hard to see.) 2014 9 27.53 S 13.2 AQ 40.6L 165 0.6 3 CAM Warners Bay, NSW 2014 9 23.54 S 13.0 AQ 40.6L 165 0.7 3 CAM Warners Bay, NSW 2014 9 22.57 S 13.0 AQ 40.6L 165 0.7 3 CAM Warners Bay, NSW 2014 8 20.09 S 12.9 AU 22.0L 160 0.5 4 GOI Araçatuba 2014 8 19.14 S 12.8 AU 22.0L 160 0.5 4 GOI Araçatuba 2013 7 8.45 S 14.3 AQ 25.0L 83 0.6 2 WYA Walcha, NSW (Difficult due to scintillation effects.) 2013 7 2.44 S 14.2 AQ 25.0L 167 0.5 2 WYA Walcha, NSW (Coma diffuse with small diffuse central condensation during periods of good seeing.) 2013 6 3.39 S 14.0 AQ 25.0L 83 0.7 2 WYA Walcha, NSW (Coma very diffuse with slightly brighter central condensation. Observed over a period of 25 minutes.)
2006 9 27.46 S 13.2 AU 40.0L 144 1.3 4 YOS Kita-karuizawa, Gunma (Not so fine as before due to the sky condition. But the comet was definitely visible visually. It seems small but well condensed.) 2006 9 22.89 S 13.7 AC 41.0L 121 0.8 3 RES Szamotuly-Galowo 2006 9 21.94 S 13.6 AC 41.0L 121 0.7 3 RES Szamotuly-Galowo 2006 9 17.89 S 13.7 AC 41.0L 121 0.5 3 RES Szamotuly-Galowo 2006 9 13.94 S 13.6 AC 41.0L 121 0.5 3 RES Szamotuly-Galowo 2006 8 22.67 S 13.7 AU 40.0L 144 0.9 5 YOS Kita-karuizawa, Gunma (Unexpectedly, it was clearly visible with an excellent clear sky. It is brighter than expected! Moderately condensed.) 2005 7 10.951 S 13.8 AU 31.0J 155 0.6 1 DIJ Revest-du-Bion, France 2005 7 10.911 S 13.8 AU 31.0J 155 0.6 4 BOU Revest-du-Bion, France 2005 7 8.917 S 13.8 AU 31.0J 155 0.6 4 DIJ Revest-du-Bion, France 2005 7 8.913 S 13.8 AU 31.0J 155 0.5 5 BOU Revest-du-Bion, France 2005 7 5.932 S 13.6 AU 31.0J 155 1.0 0/ DIJ Revest-du-Bion, France 2005 7 5.928 S 13.8 AU 31.0J 155 0.6 4 BOU Revest-du-Bion, France 2005 7 3.908 S 13.4 AU 31.0J 155 0.7 4 DIJ Revest-du-Bion, France 2005 7 3.906 S 13.7 AU 31.0J 155 0.5 4 BOU Revest-du-Bion, France 2005 6 6.55 S[13.0 AU 40.0L 144 !0.9 YOS Kita-karuizawa, Gunma (Not visible. I felt something visible near by the position, but I found there are two 14.5 mag stars.) 2005 5 7.11 S 14.3 HS 20.3T 160 0.6 6 GON Sierra del Aramo, Asturias (Mountain location, very clear sky. Limiting star magnitude near 117P: 15.5.)