Weekly Information about Bright Comets (2023 May 27: South)

Japanese version Home page	Updated on May 27, 2023
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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.

C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 10.3 mag (May 1, Jose Guilherme de S. Aguiar). Fading slowly. In the Northern Hemisphere, it is not observable now, but it will appear in August. It locates somewhat low in the Southern Hemisphere. But it will become high in summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 5 18.82 -17 39.7 3.317 2.653 42 9.8 18:27 ( 80, 17) June 3 5 27.87 -16 5.3 3.411 2.712 39 9.9 18:25 ( 79, 13) C/2020 V2 ( ZTF ) Now it is 10.6 mag (Apr. 9, Ken-ichi Kadota). It stays 10 mag for a while. Now it is not observable. It will appear in June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 2 52.21 21 54.5 3.173 2.238 18 10.0 5:26 (245, -3) June 3 2 56.50 20 41.7 3.131 2.247 24 10.0 5:30 (242, 3) C/2023 E1 ( ATLAS ) It brightened very rapidly. Now it is 11.4 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). It will turn to fade out rapidly after brightening. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now, but it will appear in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 12 14.66 66 58.5 0.764 1.176 81 10.9 19:57 (180,-12) June 3 12 23.35 69 42.8 0.754 1.125 77 10.5 19:38 (180,-15) C/2021 T4 ( Lemmon ) It is expected to brighten up to 8 mag in July. Now it is 10.5 mag (May 19, Giuseppe Pappa). It will brighten rapidly after this. It stays extremely low in the Northern Hemisphere. But it will become high in winter. In the Southern Hemisphere, it stays observable in good condition. At the high light, it will be observable in excellent condition in the Southern Hemisphere, but it will be very low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 0 43.81 -13 3.4 1.976 1.741 61 11.4 5:26 (253, 43) June 3 0 42.90 -14 19.7 1.769 1.693 68 11.0 5:30 (248, 50) C/2019 U5 ( PanSTARRS ) Now it is 12.1 mag (May 24, Osamu Miyazaki). Fading slowly. It will be getting lower gradually after this, and it will be unobservable in July in the Northern Hemisphere, or in August in the Southern Hemisphere. But it will be observable again in September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 10 30.21 -4 30.6 3.421 3.662 95 11.9 18:27 (173, 59) June 3 10 26.35 -5 1.2 3.557 3.672 88 12.0 18:25 (158, 58) C/2022 A2 ( PanSTARRS ) It brightened up to 9.5 mag from winter to early spring (Jan. 30, Katsumi Yoshimoto). Now it is 11.3 mag (May 24, Osamu Miyazaki). Fading gradually. In the Northern Hemisphere, it will be getting higher gradually. It locates somewhat low in the Southern Hemisphere. But it will become high in summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 0 52.60 37 10.7 2.716 2.139 45 12.1 5:26 (216, 5) June 3 0 56.04 36 33.9 2.693 2.191 50 12.3 5:30 (212, 9) C/2020 K1 ( PanSTARRS ) Now it is 12.5 mag (May 23, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. It was expected to brighten up to 10 mag from spring to summer. However, it is fainter than originally expected. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 21 5.14 -69 58.3 2.502 3.078 115 12.3 4:50 ( 0, 55) June 3 21 8.97 -73 52.7 2.479 3.083 117 12.3 4:27 ( 0, 51) 237P/LINEAR It brightened very rapidly as expected. Now it is 11.9 mag (May 23, Osamu Miyazaki). Fading gradually. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 19 58.13 -9 0.2 1.231 1.990 124 12.4 3:42 (180, 64) June 3 20 0.34 -7 20.1 1.184 1.993 129 12.3 3:17 (180, 62) 364P/PanSTARRS It approached to Earth down to 0.12 a.u. in April, and brightened up to 11.5 mag (Apr. 8, Osamu Miyazaki). Now it is 12.9 mag (May 20, Jose Guilherme de S. Aguiar). It will fade out rapidly after this. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will be unobservable in June. But it will be observable again in June. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 1 3.71 -8 3.5 0.602 0.829 54 12.6 5:26 (252, 37) June 3 1 19.58 -6 57.8 0.677 0.864 57 13.2 5:30 (248, 39) 81P/Wild 2 Now it is 12.0 mag (May 24, Osamu Miyazaki). It will fade out rapidly after this. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 17 34.98 -18 13.6 1.224 2.205 160 12.9 1:20 (180, 73) June 3 17 28.13 -18 14.6 1.243 2.246 168 13.1 0:46 (180, 73) C/2022 E3 ( ZTF ) It approached to Earth down to 0.29 a.u. in early February, and it brightened up to 4.5 mag (Feb. 1, Juan Jose Gonzalez). Now it is 11.6 mag (Apr. 23, Jose Guilherme de S. Aguiar). Fading gradually. In the Northern Hemisphere, it is not observable now, but it will appear in September. It locates somewhat low in the Southern Hemisphere. But it will become high in summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 5 36.11 -14 53.5 2.949 2.290 41 12.9 18:27 ( 85, 19) June 3 5 42.02 -15 55.9 3.042 2.370 40 13.2 18:25 ( 81, 15) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 12.7 mag (May 23, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it will be unobservable in June. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 9 12.87 -30 22.0 5.564 5.630 88 13.1 18:27 ( 97, 70) June 3 9 16.56 -30 10.4 5.684 5.673 84 13.2 18:25 ( 93, 66) C/2019 T4 ( ATLAS ) It brightened up to 11.1 mag in early 2022 (Mar. 31, 2022, F. Kugel, J.-G. Bosch, J. Nicolas). Now it is 13.3 mag (May 23, Chris Wyatt). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 15 22.61 20 55.2 4.349 5.128 136 13.4 23:03 (180, 34) June 3 15 19.79 21 20.9 4.424 5.159 132 13.5 22:33 (180, 34) 185P/Petriew It is expected to brighten up to 11 mag in July. Now it is 19.0 mag (May 8, iTelescope Deep Sky Chile, Rio Hurtado). It will turn to fade out rapidly after brightening. It stays extremely low in the Northern Hemisphere. But it will become high in autumn. It locates somewhat low in the Southern Hemisphere. Recently it is much fainter than this ephemeris. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 0 57.64 15 15.7 1.583 1.152 46 14.1 5:26 (231, 22) June 3 1 29.85 17 26.4 1.545 1.098 45 13.6 5:30 (230, 20) C/2021 S3 ( PanSTARRS ) It is expected to brighten up to 7 mag in early 2024. Now it is 14.2 mag (May 17, ATLAS Chile). Brightening gradually. In the Northern Hemisphere, it is not observable now. It locates somewhat low in the Southern Hemisphere. But it will become high in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 6 11.66 -24 18.4 4.161 3.657 53 13.7 18:27 ( 80, 31) June 3 6 20.50 -23 57.1 4.119 3.585 52 13.6 18:25 ( 79, 27) C/2021 Y1 ( ATLAS ) The brightness evolution is slower than originally predicted. Now it is 14.8 mag (May 7, ATLAS South Africa). Fading slowly. In the Northern Hemisphere, it is not observable now. It locates somewhat low in the Southern Hemisphere. But it will become high in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 5 38.85 -29 22.1 2.471 2.057 54 14.0 18:27 ( 71, 27) June 3 5 56.40 -30 57.9 2.458 2.072 56 14.0 18:25 ( 69, 26) 71P/Clark Now it is 13.7 mag (May 20, Jose Guilherme de S. Aguiar). Fading slowly. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 0 17.73 -7 20.2 2.170 1.957 64 14.1 5:26 (241, 45) June 3 0 29.49 -6 19.8 2.138 1.992 67 14.2 5:30 (235, 48) 29P/Schwassmann-Wachmann 1 Now it is 14.6 mag (May 9, Ken-ichi Kadota). It stays 14 mag for a while. It will be unobservable in June. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 6 54.27 26 20.2 6.879 6.102 37 14.1 18:27 (130, 8) June 3 6 59.58 26 7.7 6.945 6.105 31 14.1 18:25 (127, 5) 77P/Longmore Now it is 13.9 mag (May 13, Jose Guilherme de S. Aguiar). Fading gradually. In the Northern Hemisphere, it will be unobservable in August. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 13 26.90 -32 7.1 1.497 2.376 141 14.3 21:08 (180, 87) June 3 13 23.64 -32 20.0 1.553 2.383 135 14.4 20:38 (180, 87) 126P/IRAS It will brighten rapidly up to 13.5 mag in summer. Now it is 15 mag (May 19, Giuseppe Pappa). It stays 14 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 0 58.53 -10 7.1 2.096 1.764 57 14.5 5:26 (253, 39) June 3 1 9.53 -6 55.5 2.028 1.747 59 14.4 5:30 (246, 41) C/2021 X1 ( Maury-Attard ) Now it is 14.9 mag (Mar. 19, Masayoshi Yoshimi). It stays 14 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in June. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 2 42.30 2 29.8 4.083 3.234 28 14.7 5:26 (259, 11) June 3 2 43.02 3 11.0 4.019 3.234 34 14.6 5:30 (254, 16) 199P/Shoemaker 4 Now it is 16.2 mag (May 15, ATLAS Chile). It stays 15 mag for a while. In the Southern Hemisphere, it stays observable in good condition. It is fainter than this ephemeris recently. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 18 33.21 -19 44.7 2.053 2.956 147 14.8 2:18 (180, 75) June 3 18 30.33 -20 43.7 1.999 2.948 154 14.7 1:48 (180, 76) P/2018 HT3 ( NEOWISE ) Rob Matson discovered it as a bright new comet as 11 mag from SWAN images between Apr. 5 and 15. It was revealed to be an asteroid which has been observed also in 2012 and 2018. It approached to Sun down to 0.5 a.u. on Mar. 29. Now it is 15.0 mag (Apr. 30, Martin Masek). Fading rapidly. It will be fainter than 18 mag in July. In the Northern Hemisphere, it is not observable now, but it will appear in June. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 0 32.08 -89 10.1 0.400 1.213 110 14.9 5:26 (359, 36) June 3 15 31.68 -77 4.8 0.436 1.311 124 15.4 22:46 ( 0, 49) C/2022 W3 ( Leonard ) It will brighten up to 13 mag in summer. Now it is 15.8 mag (May 11, Ken-ichi Kadota). Brightening slowly. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now, but it will appear in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 1 55.70 63 19.3 1.916 1.450 48 15.0 5:26 (205,-20) June 3 1 49.06 63 38.3 1.843 1.427 50 14.9 5:30 (202,-18) C/2022 L2 ( ATLAS ) Now it is 14.6 mag (May 22, W. Pei). It stays 15 mag for a while. It stays observable in good condition. It is expected to brighten up to 12.5 mag in 2024 spring. At the high light, it will be observable in excellent condition in the Southern Hemisphere, but it will be low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 17 30.91 23 3.0 3.227 3.975 131 15.0 1:16 (180, 32) June 3 17 17.48 23 0.4 3.155 3.927 133 15.0 0:35 (180, 32) C/2022 E2 ( ATLAS ) Now it is 15.3 mag (May 9, Ken-ichi Kadota). It stays 15 mag for a while. It will be unobservable in June in the Northern Hemisphere, or in August in the Southern Hemisphere. But it will be observable again in September. It is expected to brighten up to 12 mag from 2024 to 2025. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 8 54.73 -1 44.5 5.720 5.501 72 15.2 18:27 (136, 48) June 3 8 55.33 -1 0.3 5.792 5.459 65 15.2 18:25 (130, 44) C/2021 G2 ( ATLAS ) It will brighten up to 14 mag from 2024 to 2025. Now it is 15.2 mag (May 15, ATLAS Chile). It stays 15 mag for a while. In the Northern Hemisphere, it will be unobservable in June. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 9 1.24 -29 27.6 6.114 6.125 85 15.3 18:27 ( 97, 67) June 3 9 5.68 -28 53.5 6.161 6.095 81 15.3 18:25 ( 94, 63) C/2023 B2 ( ATLAS ) Brightened rapidly. It continues brightening even after the perihelion passage. Now it is 14.9 mag (May 16, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It will be fainter than 18 mag in July. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 12 56.93 -6 7.0 1.197 2.007 130 15.4 20:39 (180, 61) June 3 13 5.51 -3 30.8 1.300 2.052 124 15.7 20:20 (180, 58) C/2020 S4 ( PanSTARRS ) Now it is 15.4 mag (May 21, M. Iozzi). Fading slowly. It will be unobservable in August in the Southern Hemisphere, or in September in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 10 2.94 26 53.9 3.573 3.514 78 15.4 18:27 (170, 27) June 3 10 10.49 26 15.9 3.679 3.533 73 15.5 18:25 (165, 27) 117P/Helin-Roman-Alu 1 Now it is 16.0 mag (May 1, iTelescope Deep Sky Chile, Rio Hurtado). It stays 15 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 0 12.13 -7 6.9 3.703 3.409 65 15.4 5:26 (240, 46) June 3 0 18.62 -6 34.6 3.627 3.423 70 15.4 5:30 (233, 49) C/2020 R7 ( ATLAS ) It brightened up to 13.4 mag in last summer (July 7, Giuseppe Pappa). Now it is 15.4 mag (May 2, Ken-ichi Kadota). Fading slowly. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 16 50.65 30 18.7 3.145 3.849 127 15.6 0:36 (180, 25) June 3 16 38.21 31 41.2 3.206 3.891 126 15.7 23:50 (180, 23) 72P/Denning-Fujikawa It will brighten up to 16 mag in June. Now it is 18.3 mag (May 10, Hidetaka Sato). It will fade out rapidly after this. It will be fainter than 18 mag in July. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it will be unobservable in July. In its last apparition in 2014, it was re-observed after 36-year blank. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 1 46.00 5 24.0 1.358 0.854 38 16.6 5:26 (248, 20) June 3 2 22.06 10 2.9 1.385 0.813 35 16.1 5:30 (245, 16) 103P/Hartley 2 It is expected to brighten up to 7.5 mag in October, and it will be observable in excellent condition. Now it is 18.3 mag (May 23, Francois Kugel). It will brighten rapidly after this. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after September. In the Southern Hemisphere, it becomes low temporarily around the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 21 57.92 4 36.3 1.709 2.014 91 16.7 5:26 (186, 50) June 3 22 9.08 6 34.9 1.583 1.952 94 16.3 5:25 (180, 48) C/2023 A3 ( Tsuchinshan-ATLAS ) It will approach to Sun down to 0.4 a.u. in late September in 2024, and it is expected to brighten up to 0 mag. Now it is 16.0 mag (May 14, G. Masi). It stays 16 mag for a while. It stays observable in good condition. At the high light, in the Northern Hemisphere, it will be observable in good condition after the perihelion passage. In the Southern Hemisphere, it will be observable in the low sky before and after the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 14 32.30 3 8.2 5.610 6.469 145 16.4 22:13 (180, 52) June 3 14 27.41 3 15.8 5.609 6.404 138 16.3 21:41 (180, 52) C/2022 A3 ( Lemmon-ATLAS ) Now it is 16.7 mag (May 9, Masayoshi Yoshimi). It stays 16 mag for a while. In the Northern Hemisphere, it will be unobservable in June. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 8 20.56 -10 21.8 4.121 3.866 68 16.4 18:27 (118, 49) June 3 8 22.31 -10 56.0 4.194 3.849 63 16.5 18:25 (112, 45) 12P/Pons-Brooks It returns for the first time in 70 years. It will brighten up to 4.5 mag in 2024 spring. Now it is 16.9 mag (May 9, Jean-Claude Merlin). Brightening gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 19 28.45 48 17.9 4.172 4.427 97 16.8 3:13 (180, 7) June 3 19 23.45 49 49.5 4.075 4.359 99 16.7 2:40 (180, 5) 118P/Shoemaker-Levy 4 It brightened up to 12.4 mag in winter (Feb. 10, Taras Prystavski). Now it is 17.5 mag (May 9, Yukihiro Sugiyama). Fading gradually. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 9 55.90 17 46.5 2.313 2.356 79 16.7 18:27 (166, 36) June 3 10 6.69 16 58.5 2.424 2.388 75 16.9 18:25 (161, 36) C/2019 E3 ( ATLAS ) Very far object. Now it is 17.0 mag (May 11, ATLAS South Africa). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 5 12.96 -67 21.6 10.318 10.354 89 16.8 18:27 ( 28, 34) June 3 5 16.59 -67 14.1 10.307 10.351 89 16.8 18:25 ( 27, 32) C/2022 U4 ( Bok ) Now it is 17.5 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 13 2.04 54 25.8 2.731 2.980 94 16.8 20:44 (180, 1) June 3 13 5.01 53 24.8 2.765 2.964 91 16.8 20:19 (180, 2) C/2022 JK5 ( PanSTARRS ) The ATLAS search program detected its cometary activity in April. Now it is 16.3 mag (May 21, ATLAS Chile). It stays 17 mag for a while. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 23 6.33 -24 33.5 2.552 2.702 87 16.9 5:26 (246, 69) June 3 23 16.08 -24 20.2 2.485 2.711 91 16.9 5:30 (236, 73) 94P/Russell 4 Now it is 17.6 mag (May 21, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in August. In the Northern Hemisphere, it will be getting lower gradually. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 9 34.71 20 46.0 2.279 2.227 74 17.0 18:27 (161, 32) June 3 9 46.43 19 35.4 2.352 2.229 70 17.0 18:25 (157, 32) 119P/Parker-Hartley It continued brightening even after the perihelion passage, and brightened up to 13.9 mag in winter (Jan. 20, Hidenori Nohara). Now it is 17.3 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag in July. It locates somewhat low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 8 43.79 22 35.8 3.331 2.997 62 17.0 18:27 (149, 26) June 3 8 53.27 22 0.4 3.438 3.023 57 17.1 18:25 (145, 24) C/2020 F2 ( ATLAS ) Now it is 17.0 mag (May 23, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 12 26.24 14 14.4 8.544 9.005 114 17.0 20:08 (180, 41) June 3 12 23.48 14 21.8 8.664 9.013 107 17.1 19:37 (180, 41) C/2018 U1 ( Lemmon ) It brightened up to 13.6 mag in 2021 (June 17, 2021, R. Carstens). Now it is 17.6 mag (May 13, ATLAS Chile). It stays 18 mag for a while. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 11 18.64 -69 3.2 6.071 6.572 115 17.1 19:00 ( 0, 56) June 3 11 11.37 -67 55.7 6.138 6.605 113 17.1 18:25 ( 0, 57) 219P/LINEAR Now it is 16.9 mag (May 27, Jost Jahn). It stays 17 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 18 25.61 -13 34.5 1.972 2.878 147 17.3 2:10 (180, 69) June 3 18 22.12 -12 59.4 1.908 2.856 154 17.1 1:40 (180, 68) 116P/Wild 4 It brightened up to 12.7 mag in last year (Feb. 27, 2022, Jose Guilherme de S. Aguiar). Now it is 17.7 mag (May 2, ATLAS South Africa). Fading gradually. It will be fainter than 18 mag in August. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 20 7.98 -24 59.1 2.273 2.985 126 17.2 3:53 (180, 80) June 3 20 6.52 -25 13.2 2.224 3.011 133 17.2 3:24 (180, 80) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 14 mag in 2031. Now it is 16.7 mag (Apr. 14, Thomas Lehmann). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. In the Northern Hemisphere, it is not observable until 2030. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 3 6.39 -57 31.9 17.775 17.625 79 17.2 5:26 (320, 34) June 3 3 9.51 -57 42.0 17.710 17.600 82 17.2 5:30 (320, 37) C/2022 P1 ( NEOWISE ) It brightened up to 9.7 mag in last autumn (Oct. 23, Marco Goiato). Now it is 17.1 mag (May 19, ATLAS South Africa). It will fade out rapidly after this. It will be fainter than 18 mag in June. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 14 13.69 -32 28.7 1.775 2.708 151 17.2 21:54 (180, 87) June 3 13 54.62 -29 2.9 1.900 2.770 141 17.7 21:07 (180, 84) 287P/Christensen Now it is 18 mag (May 11, Giuseppe Pappa). It stays 17 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it stays observable in good condition. It is fainter than this ephemeris recently. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 22 43.92 -8 19.4 2.942 3.041 85 17.3 5:26 (211, 60) June 3 22 50.20 -8 10.4 2.846 3.039 91 17.3 5:30 (200, 62) 180P/NEAT Now it is 17.3 mag (May 9, Yukihiro Sugiyama). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 9 59.38 29 51.3 2.548 2.519 76 17.3 18:27 (169, 24) June 3 10 9.06 28 35.3 2.619 2.514 72 17.3 18:25 (165, 25) 80P/Peters-Hartley Now it is 16.4 mag (May 10, Michael Jager). Fading gradually. It will be fainter than 18 mag in July. In the Northern Hemisphere, it stays observable in good condition. It looks diffuse, but it has a large coma. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 22 15.36 17 37.0 2.206 2.316 83 17.3 5:26 (190, 37) June 3 22 19.49 19 46.2 2.176 2.360 87 17.4 5:30 (182, 35) P/2014 OL465 ( PanSTARRS ) It showed cometary activity in 2023, and brightened rapidly. Now it is 17.7 mag (May 19, Hidetaka Sato). Fading slowly. It will be fainter than 18 mag in August. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 14 21.93 -45 7.3 2.506 3.400 146 17.4 22:03 ( 0, 80) June 3 14 18.48 -44 18.8 2.537 3.405 143 17.4 21:32 ( 0, 81) 99P/Kowal 1 It brightened up to 15.9 mag in 2022 spring (May 5, Toshiyuki Takahashi). Now it is 17.0 mag (May 18, ATLAS Chile). It stays 18 mag for a while. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 16 11.09 -24 26.6 3.935 4.947 176 17.6 23:52 (180, 79) June 3 16 7.29 -24 19.5 3.949 4.955 171 17.6 23:21 (180, 79) 213P/Van Ness It has not been observed yet in this apparition. It will brighten very rapidly, and it is expected to brighten up to 15 mag in summer. Brightening gradually. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 17 20.78 -38 3.9 1.380 2.349 157 18.0 1:06 ( 0, 87) June 3 17 14.85 -37 56.1 1.335 2.323 162 17.6 0:33 ( 0, 87) C/2019 O3 ( Palomar ) Now it is 17.2 mag (May 24, ATLAS-HKO, Haleakala). It stays 18 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 17 7.82 79 57.7 10.119 9.968 78 17.7 0:51 (180,-25) June 3 16 47.70 80 13.5 10.156 9.987 77 17.7 0:03 (180,-25) 96P/Machholz 1 It approached to Sun down to 0.1 a.u. on Jan. 31. It was bright as 7.0-7.5 mag in early February (Feb. 5, Michael Jager). Now it is 16.7 mag (May 23, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It will be fainter than 18 mag in June. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 19 16.63 -14 10.5 1.428 2.268 135 17.7 3:02 (180, 69) June 3 19 0.01 -15 16.3 1.439 2.352 146 17.9 2:18 (180, 70) C/2020 H6 ( ATLAS ) Now it is 17.7 mag (May 22, ATLAS-HKO, Haleakala). It stays 18 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 18 46.36 63 2.0 6.507 6.595 90 17.8 2:30 (180, -8) June 3 18 42.27 63 44.1 6.537 6.630 90 17.8 1:58 (180, -9) C/2021 C5 ( PanSTARRS ) It was predicted to brighten up to 16 mag in 2023. But actually, it is very faint as 18.6 mag (May 3, iTelescope Deep Sky Chile, Rio Hurtado). Fading slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 21 2.71 -77 29.9 2.845 3.392 114 18.1 4:49 ( 0, 48) June 3 20 53.54 -77 46.5 2.826 3.412 117 18.1 4:12 ( 0, 47) C/2022 Q2 ( ATLAS ) It was observed at 17 mag in 2022 autumn. It was predicted to be observable at 17 mag also in 2023 spring. But actually, it is extremely faint as 19.0 mag (May 16, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 16 48.98 25 8.5 1.383 2.201 132 20.0 0:36 (180, 30) June 3 16 10.63 25 2.4 1.448 2.258 132 20.2 23:21 (180, 30) 280P/Larsen In the last apparition, it had faded before the perihelion passage. It was expected to brighten up to 17 mag if it would become as bright as its last apparition. But actually, it is extremely faint as 22 mag (Apr. 8, Giuseppe Pappa). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 27 13 45.77 7 12.2 1.877 2.683 134 21.7 21:27 (180, 48) June 3 13 44.94 6 46.1 1.928 2.675 127 21.7 20:59 (180, 48)