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* * * * * 141P/Machholz 2-A * * * * *
Year Mn Day MM Mag Ref Scope Pwr coma DC tail p.a. Obs Site 2021 2 13.799 S 12.3 AQ 31.0J 89 0.8 2 DIJ Burlage 2021 2 13.795 S 12.5 AQ 31.0J 89 1.5 1/ BOU Burlage, Germany 2021 2 9.44 S 13.3 AQ 25.0L 74 0.8 3 WYA Walcha, NSW (Diffuse, difficult.) 2021 2 6.83 S 10.5 TK 20.3T 77 5 2/ GON Alto del Trichero - Soto y Amíio, León 2021 2 2.45 S 11.2 AQ 25.0L 40 5 3 WYA Walcha, NSW (Diffuse, star on edge of coma.) 2021 1 16.81 S 10.2 TK 20.3T 100 4 2/ GON Collada de la Cobertoria, Asturias 2021 1 13.797 S 10.1 AQ 25.4J 58 3.2 3 BOU Lauwersoog 2021 1 13.79 S 9.8 TK 20.3T 77 6 2/ GON Collada de la Cobertoria, Asturias (Zodiacal light. Altitude 35°.) 2021 1 13.46 S 10.6 AQ 25.0L 40 4.0 3 WYA Walcha, NSW (Diffuse, slight brightening to centre.) 2021 1 11.44 M 10.3 TK 25.0L 40 4.2 3/ WYA Walcha, NSW (Diffuse outer coma, opaque centre but weakly condensed.) 2021 1 9.98 S 10.4 TK 22.0L 60 3 2/ GOI Araçatuba 2021 1 7.80 S 10.1 TK 20.3T 77 6 2/ GON Matadeón de los Oteros, León (Altitude 30°.) 2021 1 5.43 M 10.5 TK 25.0L 40 5 6 WYA Walcha, NSW (Enhances slightly in Swan Band filter.) 2021 1 2.98 S 10.3 TK 22.0L 60 3 2/ GOI Araçatuba 2020 12 16.80 S 10.8 TK 20.3T 77 5 2/ GON Sierra de Tineo, Asturias (Faint outer coma. Altitude 22°.) 2020 12 14.39 S 13.6 AU 40.0L 144 0.8 3 YOS Mt. Hanadate, Ibaraki (Unexpectedly well visible.) 2020 12 8.78 S 11.7 AQ 20.3T 100 4 2/ GON Matadeón de los Oteros, León (Motion checked over a 30-min period. Nearby field stars checked in DSS. Altitude 24°.)
2015 9 22.19 S 13.0 HS 20.3T 154 1.5 2 BIV 2015 9 21.81 S 11.8 TA 40.0L 144 1.1 1 YOS Kita-karuizawa, Gunma (The sky became cloudy temporarily, but it became fine rapidly while the sky was getting brighter. So I could see the comet. It was located near Venus, so I also enjoyed the large Moon-like Venus.) 2015 9 20.19 S 12.9 HS 20.3T 67 1.8 2 BIV 2015 9 19.19 S 13.3 HS 20.3T 154 1.5 3 BIV 2015 9 18.19 S 13.1 HS 20.3T 154 1.0 3 BIV 2015 9 10.15 S 13.4 HS 40.7L 135 1.0 2 BIV 2015 8 28.17 S 11.2 TK 20.3T 100 2.5 2 GON Cea, León (Observed after moonset. Zodiacal light. Start of astronomical twilight. Altitude 23°.) 2015 8 26.12 S 12.3 HS 40.7L 135 1.3 3 BIV
2005 4 5.44 S 11.1 TJ 40.0L 144 2.0 1 YOS Ibaraki, Japan (Faint and widely diffused, but actually visible. Maybe my estimation of the size is too large, and the magnitude is too bright, comparing to the recent observations by others.) 2005 3 31.833 S 12.1 AU 31.0J 109 0.7 1/ DIJ Lauwersoog 2005 3 31.828 S 12.4 AU 31.0J 109 1.2 2 BOU Lauwersoog (Faint, but definitely seen as a diffuse glow in excellent sky with some interference from twilight and zodiacal light. Comet's altitude was 13 degrees.) 2005 3 11.83 S 11.7 TK 20.3T 77 0.8 2 GON Camposagrado, León (Mountain location. Zodiacal light. Comet's altitude 10 deg.) 2005 3 8.41 S[ 9.1 TJ 40.0L 144 !1.4 YOS Ibaraki, Japan (I tried to see it, but failed. It was not clear in the evening very low sky, so the limiting magnitude was not deep. The position was calculated from the orbital elements with the perihelion passage at Feb. 28.22 UT, based on the recent images by Michael Jäger.)