○ 光度等観測報告 (2019年 5月) C/2016 A1 (PANTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.48 18.7 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2016 N4 (MASTER) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 7.49 19.1 0.2′ - - - 4/5 4/5 45-cmC* 嶋邦博 ①② C/2017 K2 (PANTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 4.75 17.2 0.1′ - 0.2′ 190° 3/5 4/5 45-cmC* 嶋邦博 ①② 7.74 17.1 0.1 - - - 4/5 4/5 45-cmC* 嶋邦博 ①② C/2017 M4 (ATLAS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 3.69 13.7 0.3′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 4.71 13.3 1.5 - - - - - EOS6D** 張替憲 ③④⑤ 7.67 13.2 0.3 - - - 4/5 4/5 45-cmC* 嶋邦博 ①② C/2017 T3 (ATLAS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 3.67 19.5 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2018 A3 (ATLAS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.46 16.7 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2018 L2 (ATLAS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 7.77 15.5 0.2′ - - - 4/5 4/5 45-cmC* 嶋邦博 ①② C/2018 R3 (Lemmon) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 7.76 14.4 0.2′ - 0.4′ 300° 4/5 4/5 45-cmC* 嶋邦博 ①② C/2018 W2 (Africano) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.47 15.4 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 4.47 15.3 0.1 - 0.3′ 40° 3/5 4/5 45-cmC* 嶋邦博 ①② 7.48 15.3 0.1 - - - 4/5 4/5 45-cmC* 嶋邦博 ①② C/2018 Y1 (Iwamoto) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.44 16.4 0.2′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2019 B3 (PANTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 7.54 17.7 0.1′ - - - 4/5 4/5 45-cmC* 嶋邦博 ①② C/2019 D1 (Flewelling) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 3.77 15.1 0.2′ - >2.0′ 255° 3/5 3/5 45-cmC* 嶋邦博 ①② 4.76 15.1 0.2 - >2.0 255 3/5 4/5 45-cmC* 嶋邦博 ①② 7.71 15.4 0.2 - >2.0 255 4/5 4/5 45-cmC* 嶋邦博 ①② C/2019 F1 (ATLAS-Africano) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.62 18.0 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 3.66 18.1 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2019 H1 (NEOWISE) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 7.70 18.9 0.1′ - - - 4/5 4/5 45-cmC* 嶋邦博 ①② 49P/Arend-Rigaux 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 3.66 18.3 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①②⑥ 60P/Tsuchinshan 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 4.54 16.5 0.3′ - >4.0′ 305° 3/5 4/5 45-cmC* 嶋邦博 ①② 7.53 17.0 0.3 - >3.0 305 4/5 4/5 45-cmC* 嶋邦博 ①② 74P/Smirnova-Chernykh 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 3.73 16.9 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 7.66 16.7 0.1 - - - 4/5 4/5 45-cmC* 嶋邦博 ①② 123P/West-Hartley 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.50 13.7 1.1′ 3 - - - - 144×40-cmL 吉田誠一　 ⑦ 3.54 13.4 1.4 3 - - - - 144×40-cmL 吉田誠一　 ⑦❶ 4.55 14.9 0.3′ - >0.6′ 190° 3/5 4/5 45-cmC* 嶋邦博 ①② 149P/Mueller 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 4.59 18.1 0.1′ - 0.1′ 200° 3/5 4/5 45-cmC* 嶋邦博 ①② 158P/Kowal-LINEAR 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 3.72 19.0 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 7.68 18.9 0.1 - - - 4/5 4/5 45-cmC* 嶋邦博 ①② 377P/Scotti 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 4.56 19.7 0.1′ - - - 3/5 4/5 45-cmC* 嶋邦博 ①② 380P/2019 G1 (PANTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.61 18.9 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 3.67 18.3 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② (6478) Gault 2019 UT m2 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note May 2.58 18.3 0.1′ - >2.0′ 215° 3/5 3/5 45-cmC* 嶋邦博 ①②⑧ 4.58 18.3 0.1 - - - 3/5 4/5 45-cmC* 嶋邦博 ①②⑨ * 45-cm F12 (レデューサー使用 F4.6) カセグレン反射＋FLI ML8300。 ** 15-㎝ F4(レデューサー使用F2.5）反射＋デジタル一眼Canon EOS 6D。 ① 観測地:長野県富士見町 五藤光学八ヶ岳観測所。② 60秒露出をAstrometrica UCAC-4で測定。 ③ 15㎝F2.5反射+Canon EOS6DのG画像をGUIDE9.0を使用してMakali`i Ver1.4aにて測光。観測地 は千葉県九十九里木戸浜海岸。④ 50秒露出(25秒×2) ⑤ 集光の弱い円盤状。⑥ MP image ⑦ 観測地:群馬県・北軽井沢 ⑧ 2nd tail unconfirmed　⑨ tail unconfirmed ❶ 3日は、比較的良く見えた。