Weekly Information about Bright Comets (2018 Sept. 1: South)

Japanese version Home page	Updated on September 2, 2018
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Southern Hemisphere. Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

21P/Giacobini-Zinner Now it is very bright as 7.3 mag (Aug. 27, Marco Goiato). It stays bright as 7 mag until September. In the Northern Hemisphere, it will be observable in excellent condition. It will be getting higher gradually after this also in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 5 1.03 48 16.8 0.407 1.022 80 6.9 4:55 (194, 4) Sept. 8 5 39.31 37 7.2 0.393 1.013 79 6.8 4:46 (201, 14) C/2017 S3 ( PanSTARRS ) It brightened rapidly in outburst up to 6.9 mag (July 19, Maik Meyer). It is fading after that. Now it is 9.3 mag (Aug. 2, Katsumi Yoshimoto). It approaches to Sun down to 0.2 a.u. in August, and it was expected to brighten up to 3 mag. However, it must have been already disintegrated. Now it is not observable. In the Northern Hemisphere, it will appear in the morning sky in late October. But it will be too faint to observe. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 10 57.02 7 3.1 1.565 0.564 4 8.5 19:04 ( 89,-14) Sept. 8 11 18.97 9 39.6 1.736 0.738 5 9.9 19:09 ( 90,-17) C/2016 M1 ( PanSTARRS ) It brightened up to 7.7 mag in June (June 19, Juan Jose Gonzalez). Now it is fading. But it is still bright as 9.8 mag (Aug. 29, Chris Wyatt). It stays bright as 9-10 mag for a while. In the Southern Hemisphere, it stays observable in good condition for a long time until the comet will fade out. In the Northern Hemisphere, it is not observable for a long time until autumn in 2019 when the comet fades out down to 16 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 14 29.65 -58 16.7 2.144 2.225 81 9.4 19:04 ( 38, 50) Sept. 8 14 25.98 -58 53.4 2.253 2.235 76 9.5 19:09 ( 39, 46) C/2017 T3 ( ATLAS ) It brightened up to 8.7 mag in July (July 18, Marco Goiato). Now it is fading. But it is still bright as 12.3 mag (Aug. 29, Chris Wyatt). In the Southern Hemisphere, it is observable until September, but it locates in extremely low. In the Northern Hemisphere, it is not observable until late December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 11 33.02 -30 51.6 1.696 1.151 41 10.8 19:04 ( 63, 15) Sept. 8 12 7.71 -30 38.1 1.836 1.238 39 11.2 19:09 ( 63, 15) 38P/Stephan-Oterma Now it is 12.9 mag (Aug. 18, Paul Camilleri). It will brighten rapidly, and it is expected to brighten up to 9 mag from autumn to winter. In the Northern Hemisphere, it stays observable in good condition for a long time until it fades out. In the Southern Hemispehre, it is observable in good condition until autumn, but it will be low in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 4 43.23 7 17.0 1.548 1.819 88 11.9 4:55 (204, 45) Sept. 8 4 59.88 8 18.1 1.459 1.779 90 11.6 4:46 (203, 44) C/2016 R2 ( PanSTARRS ) Now it is 11.9 mag (Aug. 15, Thomas Lehmann). It will be fading slowly after this. In the Northern Hemisphere, it stays low until October. But it will be observable in good condition after that. In the Southern Hemisphere, it is not observable until summer in 2019. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 10 58.42 50 43.5 3.532 2.869 42 11.7 19:04 (132,-33) Sept. 8 11 19.25 50 0.3 3.536 2.900 44 11.8 19:09 (131,-35) C/2018 N1 ( NEOWISE ) It approached to Earth down to 0.3 a.u., and brightened up to 8.3 mag in July (July 22, Juan Jose Gonzalez). Now it is fading. But it is still bright as 10.4 mag (Aug. 14, Chris Wyatt). It will go away from Earth after this, and will fade out rapidly. It stays observable in good condition until September. It locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 15 12.20 -9 59.2 1.344 1.382 70 12.0 19:04 (116, 47) Sept. 8 15 8.64 -8 57.7 1.568 1.419 62 12.5 19:09 (109, 40) 64P/Swift-Gehrels It brightened in outburst on Aug. 14. Now it is bright as 13.4 mag (Aug. 22, Thomas Lehmann). It will be observable in excellent condition in the Northern Hemisphere. It stays low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 0 17.55 20 27.1 0.663 1.587 142 12.6 1:39 (180, 35) Sept. 8 0 21.07 23 9.9 0.610 1.549 145 12.3 1:15 (180, 32) C/2016 N6 ( PanSTARRS ) Now it is 11.7 mag (June 12, Juan Jose Gonzalez). It will appear in the morning sky soon in the Northern Hemisphere, or in late September in the Southern Hemisphere. It stays 12 mag for a long time until spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 8 52.25 19 53.3 3.556 2.710 28 12.3 4:55 (248, -3) Sept. 8 8 55.10 18 3.9 3.501 2.724 33 12.3 4:46 (247, 1) 48P/Johnson Now it is bright as 12.7 mag (Aug. 29, Chris Wyatt). It stays at 12-13 mag from summer to autumn. It is observable in excellent condition in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 22 35.17 -27 10.6 1.029 2.011 161 12.7 23:53 (180, 82) Sept. 8 22 32.27 -28 0.4 1.051 2.016 156 12.8 23:22 (180, 83) 29P/Schwassmann-Wachmann 1 Now it is 14.1 mag (Aug. 18, Chris Wyatt). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 23 5.43 1 1.9 4.781 5.774 168 13.1 0:27 (180, 54) Sept. 8 23 2.27 0 48.1 4.771 5.773 173 13.1 23:52 (180, 54) 46P/Wirtanen Now it is 15.1 mag (Aug. 26, Ken-ichi Kadota). It will approach to Earth down to 0.08 a.u. in December, and it is expected to brighten up to 3 mag. In the Northern Hemisphere, it stays observable in excellent condition. In the Southern Hemisphere, it is observable in good condition until mid December when it brightens up to 3 mag. But it becomes unobservable after that. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 1 32.19 -18 12.5 0.781 1.668 137 14.2 2:53 (180, 73) Sept. 8 1 38.71 -19 47.0 0.700 1.609 140 13.5 2:32 (180, 75) C/2018 L2 ( ATLAS ) Now it is 13.9 mag (Aug. 11, Paul Camilleri). It stays at 14-15 mag for a long time from summer to winter. In the Southern Hemisphere, it will be getting lower rapidly after this, then it becomes unobservable after October. In the Northern Hemisphere, it stays observable for a long time until it fades out. But it stays extremely low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 14 36.64 -10 7.4 2.362 2.085 61 14.1 19:04 (108, 40) Sept. 8 14 46.24 -8 37.5 2.401 2.037 57 14.0 19:09 (106, 35) C/2017 M4 ( ATLAS ) Now it is 14.1 mag (Aug. 11, Paul Camilleri). It stays 13-14 mag until summer in 2019. In the Northern Hemisphere, it stays observable in good condition for a while. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 16 20.20 21 16.9 3.497 3.510 82 14.2 19:04 (157, 30) Sept. 8 16 18.59 18 38.8 3.568 3.486 77 14.2 19:09 (147, 29) C/2015 O1 ( PanSTARRS ) Now it is 14.3 mag (Aug. 17, Ken-ichi Kadota). It will be observable at 12-13 mag for a long time from 2017 to 2018. In the Southern Hemisphere, it will be hardly observable after this. It becomes extremely low in September also in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 11 47.84 37 52.9 4.911 4.104 33 14.2 19:04 (123,-20) Sept. 8 11 49.54 37 8.6 4.940 4.130 32 14.2 19:09 (119,-25) 78P/Gehrels 2 Now it is 14.9 mag (Aug. 8, Toshihiko Ikemura, Hirohisa Sato). It stays at 13 mag for a long time from winter to autumn in 2019. It stays observable in good condition until winter when the comet brightens up to 13 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 21 33.22 -5 13.9 1.628 2.610 163 14.6 22:51 (180, 60) Sept. 8 21 28.50 -5 53.4 1.626 2.579 156 14.4 22:18 (180, 61) 37P/Forbes Now it is bright as 13.8 mag (Aug. 22, Thomas Lehmann). It stays observable in good condition for a long time after this. But it will be fading gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 23 24.91 6 30.0 0.993 1.975 161 14.6 0:47 (180, 48) Sept. 8 23 18.12 6 29.2 1.017 2.012 167 14.8 0:12 (180, 48) (944) Hidalgo Now it is 16.3 mag (Jan. 11, ATLAS-HKO, Haleakala). It will brighten up to 14 mag in winter. It will be observable in excellent condition in the Northern Hemisphere. It will be unobservable soon in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 4 53.69 44 37.6 1.909 2.025 81 15.0 4:55 (194, 8) Sept. 8 5 10.87 47 48.2 1.832 2.007 84 14.9 4:46 (193, 5) 66P/du Toit It brightened rapidly, and brightened up to 10.2 mag from May to June (May 22, Chris Wyatt). Now it is fading. It has already faded down to 13.0 mag (Aug. 20, Thomas Lehmann). It stays observable in good condition for a long time after this. But it will be fainter than 18 mag in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 1 3.47 -13 28.3 0.945 1.861 144 15.0 2:25 (180, 68) Sept. 8 0 53.43 -12 48.0 0.970 1.921 152 15.4 1:47 (180, 68) C/2017 B3 ( LINEAR ) Now it is 15.1 mag (June 18, Martin Masek). It stays 15 mag from 2018 to 2019, and it will be observable for a long time in the Southern Hemisphere. In the Northern Hemisphere, it will never be observable again. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 13 11.94 -64 50.2 4.223 4.143 78 15.0 19:04 ( 31, 40) Sept. 8 13 26.18 -65 12.3 4.256 4.124 75 15.0 19:09 ( 31, 39) 49P/Arend-Rigaux The condition is worst in this apparition. It must have brightened up to 14.5 mag from June to August, but it is not observable at all. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 9 22.98 16 38.7 2.428 1.523 20 15.1 4:55 (255, -7) Sept. 8 9 44.08 15 55.0 2.436 1.550 22 15.3 4:46 (256, -7) 65P/Gunn Now it is 16.4 mag (Aug. 17, Ken-ichi Kadota). It is observable at 15-16 mag in 2018, in good condition in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 23 13.57 -19 10.7 2.300 3.290 166 15.3 0:35 (180, 74) Sept. 8 23 8.64 -19 35.6 2.317 3.304 166 15.3 0:03 (180, 74) C/2015 V1 ( PanSTARRS ) Now it is 16.3 mag (Aug. 18, Ken-ichi Kadota). Fading now. It stays observable in good condition for a long time after this in the Southern Hemisphere. It stays low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 0 13.85 -30 36.0 3.873 4.765 148 15.7 1:35 (180, 85) Sept. 8 0 4.21 -32 24.4 3.891 4.791 150 15.8 0:58 (180, 87) C/2018 N2 ( ASASSN ) Now it is 15.9 mag (Aug. 22, A. Maury, J.-B. de Vanssay, J.-G. Bosch). It will brighten up to 12 mag in autumn in 2019. It stays observable in good condition for a while in the Southern Hemisphere. In the Northern Hemisphere, it stays extremely low for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 3 8.04 -44 45.0 4.624 5.091 112 15.9 4:29 ( 0, 80) Sept. 8 3 3.90 -45 22.5 4.533 5.044 115 15.8 3:57 ( 0, 80) C/2015 V2 ( Johnson ) It brightened up to 7.1 mag from May to June in 2017 (June 21, Juan Jose Gonzalez). Now it is fading. It has already faded down to 15.0 mag (July 15, Thomas Lehmann). In the Southern Hemisphere, it stays observable for a long time after this. It will never be observable again in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 2 0.92 -52 49.9 4.692 5.269 119 15.9 3:22 ( 0, 72) Sept. 8 1 56.32 -53 30.0 4.740 5.331 121 15.9 2:50 ( 0, 72) 125P/Spacewatch Now it is 17.0 mag (July 15, Toshihiko Ikemura, Hirohisa Sato). It brightens up to 16 mag from August to October. But it stays low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 14 5.40 -4 13.5 1.900 1.521 52 16.1 19:04 (108, 31) Sept. 8 14 25.49 -6 8.3 1.932 1.524 51 16.0 19:09 (104, 30) (3552) Don Quixote Now it is 16.2 mag (June 17, Jean-Francois Soulier). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition after this until it fades out. It will be unobservable soon in the Southern Hemisphere. Its cometary activity was observed on Mar. 26 (M. Mommert, D. Polishook, N. Moskovitz). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 3 1.91 42 32.5 1.400 1.884 101 16.5 4:23 (180, 12) Sept. 8 3 0.11 45 14.5 1.394 1.942 106 16.5 3:54 (180, 10) 364P/2018 A2 ( PanSTARRS ) It brightened rapidly as predicted, and brightened up to 11.1 mag (July 13, Chris Wyatt). Now it is fading. But it is still bright as 13.9 mag (Aug. 25, Ken-ichi Kadota). In the Southern Hemisphere, it stays observable in good condition all through this apparition. It became observable also in the Northern Hemisphere, but it stays low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 1 32.23 -32 24.0 0.391 1.309 133 16.5 2:54 (180, 87) Sept. 8 1 3.49 -30 30.9 0.439 1.383 142 16.6 1:58 (180, 85) 59P/Kearns-Kwee It will be observable at 16 mag in good condition from autumn to winter. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 6 35.53 30 7.1 2.684 2.362 60 16.6 4:55 (219, 12) Sept. 8 6 49.66 29 53.2 2.613 2.360 64 16.5 4:46 (218, 13) C/2016 A1 ( PanSTARRS ) It brightened up to 14.7 mag in early 2018 (Jan. 25, Catalina Sky Survey). Now it is fading slowly. In the Northern Hemisphere, it stays observable in good condition for a long time until the comet fades out. It is never observable again in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 8 9.84 51 30.4 6.275 5.722 52 16.6 4:55 (217,-15) Sept. 8 8 13.58 52 21.0 6.208 5.741 58 16.5 4:46 (215,-14) 137P/Shoemaker-Levy 2 Now it is 16.0 mag (Aug. 12, Gabor Santa). It will be observable at 16.5 mag in good condition from August to September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 21 28.14 -5 33.8 1.170 2.152 162 16.6 22:46 (180, 61) Sept. 8 21 24.74 -6 1.0 1.169 2.125 155 16.7 22:15 (180, 61) C/2017 T2 ( PanSTARRS ) Now it is 16.8 mag (Aug. 8, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 7-8 mag in 2020. In 2018, it will be observable at 15-16 mag in good condition from autum to winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 4 2.52 -4 7.3 6.440 6.686 99 16.8 4:55 (193, 58) Sept. 8 4 2.50 -4 19.0 6.280 6.628 105 16.7 4:46 (185, 59) 129P/Shoemaker-Levy 3 Now it is around the apheilon. But it brightened up to 15.8 mag in outburst (July 21, Hidetaka Sato). Now it is getting diffused. But it is bright as 16.2 mag still now (Aug. 18, Toshihiko Ikemura, Hirohisa Sato). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 21 0.80 -13 44.9 3.701 4.636 155 16.7 22:18 (180, 69) Sept. 8 20 57.79 -14 2.6 3.753 4.636 147 16.9 21:48 (180, 69) 123P/West-Hartley It will brighten up to 13-14 mag in winter, and it will be observable in excellent condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 7 40.69 30 48.7 3.015 2.445 47 16.9 4:55 (229, 2) Sept. 8 7 55.91 30 40.9 2.929 2.420 50 16.7 4:46 (229, 3) C/2010 U3 ( Boattini ) Now it is 16.0 mag (Apr. 6, Sandor Szabo). It stays 16-17 mag for a long time until 2020. It is observable in good conditioin in the Northern Hemisphere. It is not observable at all in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 9 46.73 67 33.3 8.975 8.511 59 16.9 4:55 (207,-33) Sept. 8 9 57.57 67 27.3 8.922 8.506 62 16.9 4:46 (207,-32) C/2011 KP36 ( Spacewatch ) Now it is 17.3 mag (Feb. 20, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag in 2018. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 5 9.73 4 38.7 7.585 7.510 81 17.2 4:55 (214, 44) Sept. 8 5 11.44 4 23.0 7.512 7.544 87 17.2 4:46 (209, 46) C/2018 C2 ( Lemmon ) It brightened rapidly. Now it is 16.1 mag (Aug. 5, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and will be fainter than 18 mag in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 15 59.44 -18 14.8 2.129 2.246 83 17.2 19:04 (118, 61) Sept. 8 16 10.83 -20 24.5 2.246 2.288 79 17.5 19:09 (109, 59) C/2014 OE4 ( PanSTARRS ) Now it is 16.9 mag (Aug. 19, Toshihiko Ikemura, Hirohisa Sato). It will be fading gradually after this, and it will be fainter than 18 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will never be observable again. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 23 20.19 77 52.8 7.427 7.556 93 17.2 0:42 (180,-23) Sept. 8 23 12.14 77 48.1 7.404 7.581 96 17.2 0:06 (180,-23) C/2017 K4 ( ATLAS ) Now it is 17.8 mag (Aug. 8, Toshihiko Ikemura, Hirohisa Sato). It was observed at 16 mag from summer to autumn in 2017. It will be observable at 17 mag in good condition also in 2018. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 1 9.50 29 33.0 2.801 3.509 127 17.3 2:31 (180, 25) Sept. 8 1 6.92 29 53.5 2.779 3.552 133 17.3 2:01 (180, 25) P/2018 L3 ( NEAT ) First return of a new periodic comet which brightened up to 16.5 mag in 2005. Now it is 19.1 mag (June 14, E. Schwab, D. Abreu). It will be observable at 17 mag in good condition in autumn. It locates low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 1 47.87 34 6.8 1.392 2.072 118 17.4 3:09 (180, 21) Sept. 8 1 52.71 34 53.7 1.337 2.069 123 17.3 2:46 (180, 20) C/2015 XY1 ( Lemmon ) It was observed at 17 mag in last winter. It will be observable in good condition at 17.5 mag also in this winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 5 50.84 11 38.6 8.236 7.964 70 17.6 4:55 (221, 33) Sept. 8 5 50.27 11 15.6 8.121 7.968 77 17.6 4:46 (217, 36) P/2018 P1 ( Hill ) First return of a new periodic comet which brightened up to 17.5 mag in 2010. Now it is 19.0 mag (Aug. 10, Erwin Schwab). It is expected to brighten up to 16.5 mag from November to December. It is observable in excellent condition in the Northern Hemisphere. It locates low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 4 40.38 20 54.7 1.782 1.998 86 17.8 4:55 (198, 32) Sept. 8 4 53.59 21 53.0 1.704 1.986 90 17.6 4:46 (197, 31) P/2001 R6 ( LINEAR-Skiff ) It has not been recovered yet. It will brighten up to 17.5 mag from September to November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 2 7.82 -13 7.4 1.430 2.207 128 17.9 3:29 (180, 68) Sept. 8 2 9.00 -13 20.1 1.378 2.201 134 17.8 3:02 (180, 68) P/2008 O2 ( McNaught ) First return of a new periodic comet which brightened up to 17 mag in 2008. It was predicted to brighten up to 18 mag in autumn. But actually, it is much fainter than predicted, fainter than 21.5 mag (June 22, Erwin Schwab). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 23 9.78 -0 37.6 2.823 3.819 169 17.8 0:31 (180, 56) Sept. 8 23 5.42 -0 50.6 2.813 3.818 174 17.8 23:55 (180, 56) C/2017 K2 ( PanSTARRS ) Now it is 17.7 mag (Aug. 8, Toshihiko Ikemura, Hirohisa Sato). It is expected to be observable at 5-6 mag for a long time from 2022 to 2023. It will be observable in good condition for a long time in the Southern Hemisphere. In the Northern Hemisphere, it is not observable at the highlight from 2022 summer to 2023 summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 17 8.42 58 14.5 13.331 13.308 86 17.9 19:04 (175, -4) Sept. 8 17 8.03 57 40.0 13.307 13.265 85 17.8 19:09 (171, -4) C/2018 M1 ( Catalina ) Now it is 17.4 mag (Aug. 9, Ken-ichi Kadota). It is not observable after this in the Southern Hemisphere. It is observable in good condition in the Northern Hemisphere. But it will be fainter than 18 mag in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 1 5 3.72 59 7.9 1.319 1.510 79 17.9 4:55 (191, -6) Sept. 8 5 30.81 62 2.7 1.346 1.562 81 18.1 4:46 (191, -9)