○ 光度等観測報告 (2019年 12月) C/2011 KP36 (Spacewatch) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.73 18.8 0.1′ - - - 4/5 3/5 45-cmC* 嶋邦博 ①② C/2015 O1 (PANSTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.80 18.5 0.2′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 4.77 17.9 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 5.80 17.7 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2016 M1 (PANSTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.69 15.1 0.2′ - - - 4/5 3/5 45-cmC* 嶋邦博 ①② 4.70 16.1 0.2 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2016 X1 (Lemmon) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 5.80 18.3 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2017 B3 (LINEAR) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 3.43 15.1 0.2′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2017 K2 (PANSTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 1.38 16.1 0.2′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2017 T2 (PANSTARRS) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.63 11.3 1.0′ - >8.0′ 210° 4/5 3/5 45-cmC* 嶋邦博 ①② 2.79 11.1 1.4 - 3.0 212 - - EOS6D** 張替憲 ③④⑤ 3.62 11.2 1.0 - >8.0 215 3/5 3/5 45-cmC* 嶋邦博 ①② 4.67 11.2 1.0 - >8.0 215 3/5 3/5 45-cmC* 嶋邦博 ①② 4.75 11.2 1.5 - 3.8 212 - - EOS6D** 張替憲 ③④⑤ 5.68 11.2 1.0 - >8.0 215 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 Dec. 2.59 17.8 0.1′ - - - 4/5 3/5 45-cmC* 嶋邦博 ①② 4.52 17.9 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2018 DO4 (Lemmon) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 4.52 17.4 0.1′ - 0.4′ 70° 3/5 3/5 45-cmC* 嶋邦博 ①② C/2018 N2 (ASASSN) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.50 12.4 1.0′ - >7.0′ 150° 4/5 3/5 45-cmC* 嶋邦博 ①② 3.45 12.6 1.0 - >7.0 150 3/5 3/5 45-cmC* 嶋邦博 ①② 4.50 12.5 1.0 - >7.0 150 3/5 3/5 45-cmC* 嶋邦博 ①② C/2018 Y1 (Iwamoto) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.57 20.0 0.1′ - - - 4/5 3/5 45-cmC* 嶋邦博 ①② 3.52 19.0 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2019 K5 (Young) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 3.65 16.5 0.2′ - 0.3′ 290° 3/5 3/5 45-cmC* 嶋邦博 ①② C/2019 K7 (Smith) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 4.40 16.0 0.1′ - 0.4′ 140° 3/5 3/5 45-cmC* 嶋邦博 ①② C/2019 V1 (Borisov) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.74 18.5 0.1′ - - - 4/5 3/5 45-cmC* 嶋邦博 ①② 4.68 17.9 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② C/2019 V2 (Groeller) 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 3.78 19.0 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 29P/Schwassmann-Wachmann 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 1.45 15.0 0.3′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 2.49 14.8 0.2 - - - 4/5 3/5 45-cmC* 嶋邦博 ①② 4.50 15.2 0.2 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 68P/Klemola 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 4.39 15.5 0.1′ - 0.3′ 110° 3/5 3/5 45-cmC* 嶋邦博 ①② 76P/West-Kohoutek-Ikemura 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.81 17.6 0.1′ - 1.0′ 280° 4/5 3/5 45-cmC* 嶋邦博 ①② 4.77 17.5 0.1 - 1.0 285 3/5 3/5 45-cmC* 嶋邦博 ①② 78P/Gehrels 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.81 16.6 0.1′ - 0.8′ 290° 4/5 3/5 45-cmC* 嶋邦博 ①② 101P/Chernykh 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 1.46 15.3 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 3.44 15.5 0.2 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 114P/Wiseman-Skiff 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.60 14.5 0.2′ - 0.8′ 130° 4/5 3/5 45-cmC* 嶋邦博 ①② 3.56 14.5 0.2 - 0.8 130 3/5 3/5 45-cmC* 嶋邦博 ①② 155P/Shoemaker 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 4.78 16.1 0.1′ - >3.0′ 265° 3/5 3/5 45-cmC* 嶋邦博 ①② 160P/LINEAR 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 1.45 14.0 0.2′ - 0.8′ 90° 3/5 3/5 45-cmC* 嶋邦博 ①② 3.41 14.7 0.2 - 0.8 85 3/5 3/5 45-cmC* 嶋邦博 ①② 173P/Mueller 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 4.59 16.9 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 174P/Echeclus 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 3.64 19.0 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 203P/Korlevic 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.54 17.9 0.1′ - 0.3′ 260° 4/5 3/5 45-cmC* 嶋邦博 ①② 3.62 17.2 0.1 - 0.3 260 3/5 3/5 45-cmC* 嶋邦博 ①② 246P/NEAT 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 4.80 17.0 0.1′ - 0.5′ 300° 3/5 3/5 45-cmC* 嶋邦博 ①② 260P/McNaught 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.61 13.4 0.7′ - >6.0′ 220° 4/5 3/5 45-cmC* 嶋邦博 ①② 3.55 13.4 0.7 - >5.0 220 3/5 3/5 45-cmC* 嶋邦博 ①② 4.57 13.5 0.7 - >5.0 220 3/5 3/5 45-cmC* 嶋邦博 ①② 261P/Larson 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.62 17.8 0.1′ - - - 4/5 3/5 45-cmC* 嶋邦博 ①② 4.55 18.1 0.1 - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 384P/Kowalski 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.77 17.8 0.1′ - 2.0′ 265° 4/5 3/5 45-cmC* 嶋邦博 ①② 3.76 18.2 0.1 - 1.5 265 3/5 3/5 45-cmC* 嶋邦博 ①② 5.75 17.5 0.1 - 1.5 265 3/5 3/5 45-cmC* 嶋邦博 ①② 388P/Gibbs 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 3.79 19.4 0.1′ - - - 3/5 3/5 45-cmC* 嶋邦博 ①② 2I/Borisov 2019 UT m1 Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 2.79 15.0 0.8′ - - - - - EOS6D** 張替憲 ③⑥⑦ Dec. 2.82 15.7 0.3 - 3.0′ 315° 4/5 3/5 45-cmC* 嶋邦博 ①② 3.81 15.6 0.3 - 3.0 315 3/5 3/5 45-cmC* 嶋邦博 ①② 4.77 15.4 1.4 - - - - - EOS6D** 張替憲 ③⑦⑧ 4.81 15.6 0.3 - 3.0 315 3/5 3/5 45-cmC* 嶋邦博 ①② 5.82 15.7 0.3 - 2.5 320 3/5 3/5 45-cmC* 嶋邦博 ①② 4.77 15.0 1.1 - - - - - EOS6D** 張替憲 ③⑦⑧ (3200) Phaethon 2019 UT m Dia DC Tail p.a. Trans. Seeing Instru. Observer Note Dec. 28.51 18.0 - - - - 3/5 3/5 45-cmC* 嶋邦博 ①② * 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 は千葉県九十九里海岸。④ 50秒露出(25秒×2) ⑤ 強い集光のあるコマから南西に約3分の尾が 伸びている。⑥ 118秒露出(59秒×2) ⑦ コマは淡い青みのある恒星状。⑧ 340秒露出(85秒×4)