Weekly Information about Bright Comets (2024 Aug. 17: North)

Japanese version Home page	Updated on August 21, 2024
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere. Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

C/2023 A3 ( Tsuchinshan-ATLAS ) It will approach to Sun down to 0.4 a.u. in late September, and it is expected to brighten up to 2 mag. The brightness evolution slowed down since May. Now it is 8.2 mag (Aug. 12, Thomas Lehmann). It brightens up to 2 mag, but it will turn to fade out rapidly after that. Now it is not observable. It will appear in September in the Southern Hemisphere, or in October in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 10 49.47 -1 15.1 1.944 1.069 21 7.7 20:17 ( 99,-16) Aug. 24 10 46.77 -2 9.9 1.867 0.936 15 7.1 20:06 (102,-20) 13P/Olbers It returned for the first time in 68 years. It brightened up to 6.2 mag in early summer (July 1, Virgilio Gonano). Now it is 7.4 mag (Aug. 17, Marco Goiato). It will fade out rapidly after this. It will be unobservable in October in the Southern Hemisphere, or in November in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 12 25.82 26 50.2 2.000 1.380 39 7.8 20:17 (109, 20) Aug. 24 12 51.52 23 5.1 2.059 1.436 39 8.1 20:06 (105, 20) 12P/Pons-Brooks It returns for the first time in 70 years. It brightened up to 3.7 mag in early April (Apr. 6, Jose Guilherme Aguiar). Now it is 9.8 mag (Aug. 6, Chris Wyatt). It will fade out rapidly after this. 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) Aug. 17 11 27.20 -46 50.5 2.313 2.086 64 9.9 20:17 ( 51,-30) Aug. 24 11 53.19 -47 10.8 2.448 2.174 62 10.2 20:06 ( 50,-29) C/2023 R2 ( PanSTARRS ) It will fade out rapidly after this. Now it is not observable. It will appear in September in the Northern Hemisphere. 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) Aug. 17 10 37.56 4 40.9 1.845 0.909 15 11.4 20:17 (106,-14) Aug. 24 11 12.58 4 0.6 1.853 0.930 16 11.5 20:06 (102,-11) C/2022 E2 ( ATLAS ) Now it is 12.5 mag (Aug. 7, Osamu Miyazaki). It stays 12 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 7 29.58 41 45.6 4.379 3.675 40 12.5 3:49 (234, 23) Aug. 24 7 32.35 42 48.0 4.287 3.671 46 12.4 3:57 (236, 28) C/2023 C2 ( ATLAS ) Now it is 12.7 mag (Aug. 7, Thomas Lehmann). It stays 13 mag for a while. In the Northern Hemisphere, it will be unobservable soon. But it will be observable again 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) Aug. 17 16 8.09 -53 15.9 2.139 2.578 103 12.8 20:17 ( 16, -1) Aug. 24 16 19.08 -50 40.3 2.176 2.549 99 12.8 20:06 ( 18, 1) C/2023 V4 ( Camarasa-Duszanowicz ) It brightened very rapidly up to 10.0 mag in June (June 11, Virgilio Gonano). Now it is 12.8 mag (Aug. 7, Hiroshi Abe). Fading rapidly. It will be fainter than 18 mag in November. It will be unobservable in October in the Southern Hemisphere, or in November in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 13 4.59 35 18.2 2.130 1.662 49 13.1 20:17 (113, 31) Aug. 24 13 24.17 30 59.6 2.234 1.738 48 13.5 20:06 (108, 30) 154P/Brewington Now it is 13.9 mag (Aug. 3, Ken-ichi Kadota). It will fade out rapidly after this. 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) Aug. 17 6 36.76 36 45.0 2.214 1.714 48 13.4 3:49 (244, 30) Aug. 24 6 58.07 36 42.7 2.207 1.747 50 13.8 3:57 (245, 32) C/2021 S3 ( PanSTARRS ) It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 13.2 mag (Aug. 9, Osamu Miyazaki). Fading gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now, but it will appear in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 19 22.33 58 6.0 2.432 2.831 102 13.9 21:37 (180, 67) Aug. 24 19 20.31 56 26.9 2.495 2.905 103 14.1 21:07 (180, 69) 37P/Forbes Now it is 15.1 mag (Aug. 17, ATLAS South Africa). It stays 14 mag for a while. 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) Aug. 17 14 12.05 -21 46.0 1.679 1.706 74 14.1 20:17 ( 53, 11) Aug. 24 14 29.02 -22 33.8 1.710 1.686 71 14.0 20:06 ( 52, 11) C/2021 G2 ( ATLAS ) Now it is 14.4 mag (Aug. 3, Chris Wyatt). It stays 14 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in November. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in October. But it will be observable again in December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 12 45.42 -19 13.2 5.499 4.986 54 14.2 20:17 ( 68, -2) Aug. 24 12 51.90 -19 3.1 5.579 4.984 49 14.2 20:06 ( 70, -4) 29P/Schwassmann-Wachmann 1 Now it is not observable. It will appear in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 9 18.12 15 9.9 7.228 6.224 7 14.3 3:49 (242,-12) Aug. 24 9 23.16 14 42.5 7.209 6.226 12 14.2 3:57 (247, -7) 46P/Wirtanen The condition is bad in this apparition. It must have brightened up to 10 mag in early summer, however, it is not observable at all. Fading rapidly. It will be fainter than 18 mag in October. It will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 10 26.91 17 10.5 2.542 1.557 10 14.4 20:17 (117, -8) Aug. 24 10 46.38 15 29.7 2.605 1.616 9 15.0 20:06 (116, -9) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 14.2 mag (Aug. 3, Chris Wyatt). Fading slowly. 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) Aug. 17 23 32.66 -68 27.6 4.674 5.285 122 14.6 1:52 ( 0,-13) Aug. 24 23 14.25 -69 30.9 4.753 5.342 120 14.7 1:06 ( 0,-14) C/2022 N2 ( PanSTARRS ) It is expected to brighten up to 13 mag in 2025 autumn, and it will be observable in good condition. Now it is 14.7 mag (Aug. 4, W. Pei). It stays 15 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 22 57.81 -4 2.5 3.900 4.863 159 14.8 1:17 ( 0, 51) Aug. 24 22 55.22 -4 11.2 3.837 4.828 167 14.8 0:46 ( 0, 51) 146P/Shoemaker-LINEAR Now it is 14.6 mag (July 31, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in December. In the Northern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 4 29.00 6 48.1 1.235 1.426 78 14.8 3:49 (294, 40) Aug. 24 4 45.64 9 5.0 1.208 1.436 80 14.9 3:57 (296, 45) 130P/McNaught-Hughes Now it is 14.7 mag (July 31, Ken-ichi Kadota). Fading gradually. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 2 34.12 7 51.0 1.590 2.100 105 15.0 3:49 (328, 59) Aug. 24 2 38.58 8 6.3 1.545 2.128 110 15.0 3:57 (343, 62) 2020 TS2 It approached to Sun down to 0.12 a.u. on Aug. 4. It will fade out rapidly after this. It will be fainter than 18 mag in September. Now it is not observable. It will appear soon in the Southern Hemisphere. In the Northern Hemisphere, it will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 9 24.49 9 31.3 0.538 0.482 6 15.0 3:49 (245,-17) Aug. 24 9 0.18 -0 4.1 0.384 0.667 21 15.7 3:57 (262,-11) C/2022 QE78 ( ATLAS ) Now it is 15.6 mag (Aug. 18, ATLAS-HKO, Haleakala). 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) Aug. 17 6 18.51 3 26.5 6.738 6.170 52 15.2 3:49 (278, 17) Aug. 24 6 22.93 3 25.8 6.635 6.147 57 15.2 3:57 (283, 23) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 14.9 mag (Aug. 10, Ken-ichi Kadota). It stays 16 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 6 19.67 16 58.7 7.161 6.554 49 15.3 3:49 (266, 24) Aug. 24 6 21.88 17 8.9 7.123 6.611 55 15.4 3:57 (270, 31) C/2022 L2 ( ATLAS ) Now it is 15.6 mag (July 24, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in October. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 9 50.02 -23 44.6 3.895 3.148 37 15.4 20:17 ( 86,-40) Aug. 24 9 51.50 -24 20.8 3.949 3.185 35 15.5 3:57 (277,-35) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.9 mag (July 25, Hidetaka Sato). It stays 16 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) Aug. 17 4 18.21 -65 26.6 15.866 16.054 98 15.6 3:49 (343,-15) Aug. 24 4 19.88 -65 56.2 15.835 16.030 99 15.5 3:57 (347,-14) 32P/Comas Sola Now it is 14.7 mag (May 31, Hiroshi Abe). Fading slowly. Now it is not observable. It will appear in October in the Northern Hemisphere, or in November in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 10 27.28 16 57.6 3.267 2.279 10 15.6 20:17 (117, -8) Aug. 24 10 41.55 15 31.8 3.302 2.307 8 15.7 20:06 (117,-10) 30P/Reinmuth 1 Now it is 16.5 mag (Apr. 3, Taras Prystavski). It stays 16 mag for a while. Now it is not observable. It will appear in September in the Northern Hemisphere, or in November in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 9 2.54 17 44.9 2.794 1.812 11 15.6 3:49 (242, -7) Aug. 24 9 21.36 16 41.4 2.781 1.813 13 15.6 3:57 (246, -5) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 16.3 mag (July 16, ATLAS Chile). It stays 16 mag for a while. In the Northern Hemisphere, it will never be observable after this. 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) Aug. 17 11 18.61 -46 19.4 8.910 8.503 63 15.9 20:17 ( 52,-31) Aug. 24 11 23.56 -46 27.8 9.011 8.547 59 15.9 20:06 ( 53,-33) C/2024 G3 ( ATLAS ) It approaches to Sun down to 0.09 a.u. on Jan. 13, 2025. According to the calculation, it will brighten up to -1 mag. But probably, it will be disintegrated. At the high light, it may be observable after the perihelion passage only in the Southern Hemisphere. Now it is 16.0 mag (Aug. 13, ATLAS Chile). It will brighten rapidly after this. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 13 7.90 -56 52.8 2.982 3.008 81 16.2 20:17 ( 34,-21) Aug. 24 13 14.65 -55 9.8 2.975 2.910 76 16.0 20:06 ( 36,-21) 299P/Catalina-PanSTARRS It brightened very rapidly in outburst in late May. Now it is 16.3 mag (Aug. 15, ATLAS Chile). Fading slowly. It will be unobservable in November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 15 42.33 -22 39.2 2.966 3.205 94 16.0 20:17 ( 35, 24) Aug. 24 15 48.34 -22 37.2 3.068 3.211 88 16.1 20:06 ( 37, 22) C/2019 U5 ( PanSTARRS ) Now it is 14.9 mag (June 5, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in September. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 7 50.90 -34 53.4 6.182 5.671 55 16.1 3:49 (298,-23) Aug. 24 7 52.73 -35 39.9 6.198 5.714 57 16.1 3:57 (302,-17) C/2023 Q1 ( PanSTARRS ) Now it is 16.5 mag (Aug. 7, D. Buczynski). Brightening slowly. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 4 32.30 48 20.8 2.950 2.814 72 16.3 3:49 (234, 54) Aug. 24 4 46.98 50 12.5 2.853 2.785 75 16.2 3:57 (230, 57) 192P/Shoemaker-Levy 1 Now it is 16.0 mag (July 31, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in October. 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) Aug. 17 5 46.13 26 0.8 2.119 1.790 57 16.3 3:49 (261, 35) Aug. 24 6 1.12 27 21.2 2.106 1.838 60 16.4 3:57 (262, 40) C/2020 K1 ( PanSTARRS ) It brightened up to 12.1 mag in 2023 spring (May 20, 2023, Jose Guilherme de S. Aguiar). Now it is 16.3 mag (Aug. 2, ATLAS South Africa). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in September. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 6 48.58 -35 49.6 5.637 5.285 64 16.3 3:49 (305,-12) Aug. 24 6 52.12 -36 6.1 5.651 5.332 66 16.4 3:57 (309, -7) 89P/Russell 2 Now it is 16.5 mag (Aug. 3, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in November. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 23 52.57 -19 42.7 1.526 2.451 149 16.4 2:11 ( 0, 35) Aug. 24 23 48.16 -20 5.4 1.517 2.471 155 16.4 1:39 ( 0, 35) 472P/2023 RL75 ( NEAT-LINEAR ) Now it is 16.4 mag (Aug. 18, ATLAS-HKO, Haleakala). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 5 42.18 16 31.3 3.809 3.397 58 16.6 3:49 (271, 32) Aug. 24 5 50.71 16 15.1 3.730 3.401 63 16.5 3:57 (276, 37) C/2023 F3 ( ATLAS ) Now it is 16.8 mag (Aug. 14, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in December. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 13 23.74 -40 54.7 5.536 5.346 73 16.5 20:17 ( 46, -9) Aug. 24 13 23.40 -40 24.0 5.632 5.334 67 16.5 20:06 ( 48,-11) C/2022 R6 ( PanSTARRS ) Now it is 16.6 mag (Aug. 2, ATLAS South Africa). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will be observable soon. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 6 40.39 -24 36.7 7.492 7.027 59 16.6 3:49 (297, -4) Aug. 24 6 44.94 -24 54.5 7.428 7.011 62 16.5 3:57 (302, 1) 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 16.1 mag (Aug. 1, ATLAS-MLO, Mauna Loa). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 17 12.40 30 34.9 7.285 7.543 100 16.7 20:17 ( 70, 79) Aug. 24 17 12.61 30 1.3 7.390 7.583 97 16.7 20:06 ( 75, 75) C/2019 E3 ( ATLAS ) Very far object. Now it is 17.1 mag (July 25, Hidetaka Sato). 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) Aug. 17 2 55.64 -67 13.7 10.072 10.418 107 16.7 3:49 (352,-13) Aug. 24 2 51.52 -67 44.0 10.069 10.423 107 16.7 3:57 (356,-13) C/2023 TD22 ( Lemmon ) Now it is 16.5 mag (Aug. 15, Taras Prystavski). Fading slowly. It will be fainter than 18 mag in October. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 23 46.43 4 30.9 1.477 2.380 145 16.9 2:06 ( 0, 60) Aug. 24 23 14.00 2 5.6 1.396 2.371 159 16.7 1:07 ( 0, 57) C/2024 A1 ( ATLAS ) Now it is 17.3 mag (May 6, ATLAS Chile). Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear in September. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 7 45.83 -26 12.6 5.256 4.659 49 16.8 3:49 (290,-17) Aug. 24 7 50.86 -26 2.4 5.202 4.627 50 16.7 3:57 (294,-12) P/2023 S1 Now it is 17.5 mag (Mar. 9, Toshihiko Ikemura, Hirohisa Sato). Brightening slowly. In the Northern Hemisphere, it will be getting higher gradually. It stays extremely 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) Aug. 17 7 0.41 28 12.4 3.531 2.849 41 16.8 3:49 (250, 22) Aug. 24 7 12.60 27 50.9 3.454 2.834 45 16.7 3:57 (253, 26) C/2024 M1 ( ATLAS ) It is expected to brighten up to 13.5 mag, and it will be observable in good condition in winter. Now it is 17.1 mag (Aug. 13, ATLAS South Africa). It will brighten rapidly after this. In the Northern Hemisphere, it will be unobservable soon. But it will be observable again 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) Aug. 17 6 12.04 -30 54.8 2.237 2.079 67 16.9 3:49 (306, -3) Aug. 24 6 20.84 -29 59.9 2.159 2.032 69 16.8 3:57 (309, 2) C/2024 B1 ( Lemmon ) It stays 17 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in winter. 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) Aug. 17 7 55.32 43 25.2 2.454 1.774 38 16.9 3:49 (230, 19) Aug. 24 8 22.20 45 17.4 2.364 1.740 41 16.8 3:57 (229, 22) 479P/2023 WM26 ( Elenin ) First return of a new periodic comet which was discovered in 2011, half a year after the perihelion passage. It brightened very rapidly up to 10.7 mag in spring (Apr. 28, Marco Goiato). Now it is 17.8 mag (July 26, ATLAS Chile). Fading rapidly. It will be fainter than 18 mag in September. 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) Aug. 17 15 47.93 -27 36.5 1.411 1.828 96 16.8 20:17 ( 31, 20) Aug. 24 16 6.82 -27 11.5 1.529 1.889 93 17.3 20:06 ( 31, 21) C/2022 S4 ( Lemmon ) It has started fading before the perihelion passage. Now it is 17.0 mag (Aug. 11, Thomas Lehmann). Fading slowly. It will be fainter than 18 mag in November. In the Northern Hemisphere, it will never be observable after this. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 8 24.05 -62 59.5 2.805 2.778 78 17.0 3:49 (327,-36) Aug. 24 9 1.87 -63 59.7 2.848 2.787 76 17.0 3:57 (328,-37) P/2024 N5 ( Siding Spring ) First return of a new periodic comet which brightened up to 16 mag in 2012. It is expected to brighten rapidly up to 14.5 mag in autumn. Now it is 18.5 mag (July 25, Hidetaka Sato). Brightening gradually. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 4 1.23 -1 43.3 1.703 1.931 86 17.3 3:49 (308, 39) Aug. 24 4 10.56 0 3.2 1.612 1.908 90 17.0 3:57 (314, 45) 328P/LONEOS-Tucker Now it is 16.8 mag (Aug. 3, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in October. 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) Aug. 17 3 9.64 31 45.1 1.578 1.883 90 17.0 3:49 (272, 69) Aug. 24 3 21.48 33 58.5 1.528 1.890 94 17.0 3:57 (268, 74) 65P/Gunn Now it is 16.6 mag (Aug. 12, ATLAS Chile). It stays 17 mag for a while. It will be unobservable in September in the Northern Hemisphere, or in October in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 13 17.35 -4 6.3 3.739 3.269 55 17.0 20:17 ( 75, 13) Aug. 24 13 24.78 -5 5.9 3.802 3.255 50 17.0 20:06 ( 76, 10) C/2021 X1 ( Maury-Attard ) It brightened up to 14 mag in early 2023 and 2023 autumn. Now it is 17.1 mag (Aug. 14, A. Diepvens). Fading slowly. It will be fainter than 18 mag in October. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 21 12.33 22 3.9 4.348 5.197 143 17.1 23:26 ( 0, 77) Aug. 24 21 2.92 21 30.7 4.398 5.243 143 17.2 22:49 ( 0, 77) C/2023 R1 ( PanSTARRS ) Now it is 17.0 mag (Aug. 18, ATLAS-MLO, Mauna Loa). It stays 17 mag for a while. 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) Aug. 17 23 49.42 32 6.1 5.634 6.279 125 17.2 2:08 ( 0, 87) Aug. 24 23 42.43 32 1.8 5.516 6.235 131 17.2 1:34 ( 0, 87) 253P/PanSTARRS Now it is 17.8 mag (Aug. 16, ATLAS-MLO, Mauna Loa). 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) Aug. 17 0 53.78 2 4.0 1.279 2.088 130 17.3 3:12 ( 0, 57) Aug. 24 0 56.60 1 48.8 1.218 2.076 137 17.2 2:47 ( 0, 57) 362P/(457175) 2008 GO98 Now it is 16.4 mag (May 4, Toshiyuki Takahashi). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in November in the Southern Hemisphere, or in December in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 15 26.15 -4 18.6 2.755 2.870 86 17.3 20:17 ( 51, 36) Aug. 24 15 32.99 -4 58.4 2.844 2.872 81 17.3 20:06 ( 53, 34) C/2022 U1 ( Leonard ) Now it is 17.2 mag (July 21, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag in October. 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) Aug. 17 20 9.78 44 53.3 3.808 4.371 117 17.3 22:23 (180, 80) Aug. 24 19 56.53 43 6.9 3.828 4.388 117 17.3 21:43 (180, 82) C/2024 L5 ( ATLAS ) Now it is 17.0 mag (Aug. 15, ATLAS Chile). It stays 17 mag for a while. It will be unobservable in September in the Northern Hemisphere, or in October in the Southern Hemisphere. But it will be observable again in December in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 15 17.30 -31 42.6 3.783 3.933 91 17.3 20:17 ( 35, 13) Aug. 24 15 12.43 -31 2.3 3.889 3.902 83 17.4 20:06 ( 39, 11) 125P/Spacewatch Now it is 16.8 mag (Aug. 3, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in September. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 21 24.30 -11 20.3 1.136 2.146 174 17.3 23:39 ( 0, 44) Aug. 24 21 19.26 -12 34.7 1.189 2.186 166 17.5 23:06 ( 0, 42) 50P/Arend It stays 18 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now, but it will appear in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 7 12.18 37 0.7 2.751 2.104 41 17.4 3:49 (240, 24) Aug. 24 7 30.27 36 45.7 2.729 2.129 44 17.5 3:57 (242, 26) 49P/Arend-Rigaux It will brighten up to 14 mag in 2025 spring. Now it is 17.9 mag (Aug. 13, ATLAS South Africa). 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) Aug. 17 0 27.04 -20 3.3 1.834 2.697 141 17.8 2:45 ( 0, 35) Aug. 24 0 25.55 -21 31.6 1.749 2.651 146 17.6 2:16 ( 0, 34) C/2021 S4 ( Tsuchinshan ) Now it is 17.6 mag (Apr. 11, Mt. Lemmon Survey). It stays 18 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now, but it will appear in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 7 0.42 38 38.5 7.537 6.850 44 17.6 3:49 (240, 26) Aug. 24 7 6.17 38 40.7 7.472 6.860 49 17.6 3:57 (242, 32) C/2024 J3 ( ATLAS ) Now it is 17.4 mag (Aug. 12, ATLAS South Africa). It stays 18 mag for a while. In the Northern Hemisphere, it will be unobservable in December. In the Southern Hemisphere, it stays observable in good condition. It is expected to brighten up to 13 mag in 2026, and it will be observable in excellent condition in the Northern Hemisphere. In the Southern Hemisphere, it locates very low at the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 18 30.77 -40 5.5 7.030 7.716 129 17.6 20:46 ( 0, 15) Aug. 24 18 27.89 -39 34.3 7.075 7.673 123 17.6 20:16 ( 0, 15) 338P/McNaught Now it is 17.9 mag (Aug. 7, ATLAS-HKO, Haleakala). It stays 18 mag for a while. 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) Aug. 17 2 40.36 20 40.8 1.884 2.290 100 17.7 3:49 (309, 69) Aug. 24 2 44.76 22 33.2 1.809 2.293 105 17.6 3:57 (323, 75) 190P/Mueller Now it is 18.3 mag (Aug. 15, ATLAS South Africa). 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) Aug. 17 23 4.66 -5 53.0 1.327 2.302 159 17.9 1:23 ( 0, 49) Aug. 24 23 1.28 -6 3.9 1.278 2.275 166 17.7 0:53 ( 0, 49) 208P/McMillan Now it is 19.0 mag (Aug. 6, W. Hasubick). It stays 18 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 0 1.11 -5 43.4 1.626 2.529 145 17.8 2:20 ( 0, 49) Aug. 24 23 58.88 -5 56.6 1.585 2.529 153 17.7 1:50 ( 0, 49) 242P/Spahr Now it is 19.0 mag (Aug. 11, W. Hasubick). 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) Aug. 17 4 4.45 -3 9.4 3.951 4.015 86 17.8 3:49 (309, 38) Aug. 24 4 9.01 -3 56.2 3.854 4.010 91 17.8 3:57 (317, 42) 117P/Helin-Roman-Alu 1 Now it is 18.5 mag (Aug. 11, W. Hasubick). It stays 18 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 17 3 34.41 16 32.8 4.273 4.374 88 17.9 3:49 (296, 57) Aug. 24 3 36.73 16 43.3 4.180 4.387 95 17.8 3:57 (306, 63) P/2010 WK ( LINEAR ) First return of a new periodic comet which brightened up to 15 mag in 2010. Now it is 19.1 mag (Aug. 13, John Maikner). It stays 18 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) Aug. 17 6 11.79 30 55.9 2.241 1.805 52 18.2 3:49 (253, 32) Aug. 24 6 32.08 31 15.4 2.209 1.818 54 18.1 3:57 (254, 35)