Weekly Information about Bright Comets (2025 May 24: South)

Japanese version Home page	Updated on May 27, 2025
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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 It brightened up to 11 mag in the SWAN images (Jan. 27, Vladimir Bezugly). It will fade out rapidly after this. Now it is not observable. It will appear in July 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 24 4 22.78 6 35.4 2.259 1.307 14 13.0 18:28 ( 94, -6) May 31 4 46.68 6 17.4 2.312 1.366 16 13.3 18:26 ( 93, -6) C/2023 A3 ( Tsuchinshan-ATLAS ) It brightened up to -3 mag due to the forward scattering on Oct. 9 in the SOHO coronagraph images (Q.-c. Zhang, Charles S. Morris). It became a great comet of 0 mag on the ground. Now it is 12.6 mag (Apr. 26, Hiroshi Abe). Fading slowly. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. But it will become high in spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 19 52.48 27 16.8 3.463 3.875 106 13.1 3:47 (180, 28) May 31 19 43.66 28 1.1 3.467 3.957 111 13.2 3:10 (180, 27) 217P/LINEAR It is visible at 12-13 mag in the SWAN images (May 2, Vladimir Bezugly). Fading gradually. In the Northern Hemisphere, it is not observable now, but it will appear in July. It stays extremely low in the Southern Hemisphere. But it will become high in autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 2 18.62 6 17.2 2.009 1.226 29 13.2 5:25 (254, 11) May 31 2 44.58 8 5.7 2.011 1.229 29 13.2 5:29 (252, 11) C/2025 F2 ( SWAN ) Bright new comet discovered in the SWAN images. It brightened rapidly up to 7.8 mag on Apr. 8 (Osamu Miyazaki). The nucleus was disintegrated, however, its remnant is still visible. Fading rapidly. It will be fainter than 18 mag in August. 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 summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 5 17.79 -8 12.5 1.248 0.703 34 13.4 18:28 ( 89, 14) May 31 5 27.80 -14 25.3 1.352 0.849 38 14.1 18:26 ( 81, 14) C/2024 G3 ( ATLAS ) It approached to Sun down to 0.09 a.u. on Jan. 13. It brightened up to -2 or -3 mag and it was detected even in the daylight. The nucleus was disintegrated on Jan. 19. However, its remnant is still visible. Fading gradually. 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 24 2 26.23 -52 15.3 2.805 2.741 75 13.6 5:25 (313, 36) May 31 2 38.02 -53 57.5 2.843 2.841 79 13.8 5:29 (314, 40) 29P/Schwassmann-Wachmann 1 Now it is 12.7 mag (May 20, Osamu Miyazaki). 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 9 41.04 10 22.0 6.351 6.278 81 14.0 18:28 (161, 43) May 31 9 43.40 10 9.4 6.461 6.280 75 14.0 18:26 (154, 41) C/2021 G2 ( ATLAS ) Now it is 13.4 mag (May 20, Osamu Miyazaki). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 15 14.51 -4 51.7 4.393 5.357 160 14.0 23:05 (180, 60) May 31 15 11.90 -4 5.4 4.448 5.376 153 14.0 22:35 (180, 59) C/2022 N2 ( PanSTARRS ) Now it is 14.9 mag (Feb. 4, Alfons Diepvens). It stays 14 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 1 47.23 15 22.8 4.688 3.873 32 14.2 5:25 (242, 11) May 31 1 55.95 16 16.1 4.625 3.864 37 14.2 5:29 (238, 14) 48P/Johnson Now it is 15.2 mag (May 10, Taras Prystavski). Fading slowly. In the Northern Hemisphere, it will be unobservable in June. But it will be observable again in June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 1 24.11 -0 43.2 2.711 2.108 44 14.5 5:25 (251, 26) May 31 1 37.98 0 18.7 2.677 2.125 47 14.5 5:29 (247, 29) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 14.6 mag (Apr. 29, Ken-ichi Kadota). It stays 15 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) May 24 1 51.71 49 41.0 5.033 4.292 38 14.7 5:25 (217,-13) May 31 1 52.80 50 13.2 5.024 4.323 41 14.7 5:29 (213, -9) 49P/Arend-Rigaux Now it is 14.5 mag (Apr. 21, Hiroshi Abe). It will fade out rapidly after this. It will be fainter than 18 mag in September. It will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 6 38.26 23 53.9 2.206 1.509 36 14.8 18:28 (128, 9) May 31 7 2.21 24 25.2 2.256 1.535 34 14.9 18:26 (128, 8) C/2022 QE78 ( ATLAS ) Now it is 14.6 mag (May 10, Alfons Diepvens). It stays 15 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 24 6 57.27 16 46.9 6.255 5.536 41 14.9 18:28 (125, 17) May 31 7 3.15 17 5.3 6.316 5.529 36 14.9 18:26 (122, 13) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 14.9 mag (May 3, Thomas Lehmann). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting higher gradually. 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 24 4 24.92 -65 22.9 15.146 15.113 86 15.2 18:28 ( 29, 30) May 31 4 30.34 -65 25.3 15.104 15.090 87 15.2 5:29 (332, 29) 65P/Gunn Now it is 15.7 mag (May 7, Thomas Lehmann). It stays 15 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 24 19 0.06 -28 53.4 2.086 2.928 139 15.3 2:55 (180, 84) May 31 18 58.03 -29 25.1 2.029 2.927 146 15.2 2:25 (180, 84) 43P/Wolf-Harrington Now it is 16.5 mag (Apr. 7, Alfons Diepvens). It stays 15 mag for a while. Now it is not observable. It will appear in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 5 12.58 20 30.2 3.455 2.499 16 15.4 18:28 (112, -4) May 31 5 26.93 20 31.9 3.466 2.489 13 15.3 18:26 (111, -6) C/2024 E1 ( Wierzchos ) It is expected to brighten up to 5 mag in 2026 January. Now it is 16.0 mag (May 8, Ken-ichi Kadota). Brightening 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 July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 17 57.89 57 19.7 3.504 3.786 98 15.5 1:52 (180, -2) May 31 17 47.02 57 54.4 3.414 3.705 98 15.4 1:14 (180, -3) C/2023 R1 ( PanSTARRS ) It is expected to brighten up to 13 mag in early summer in 2026. Now it is 16.0 mag (May 13, ATLAS-MLO, Mauna Loa). Brightening slowly. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. But it will become high in autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 22 31.38 22 51.9 4.733 4.591 75 15.5 5:25 (196, 30) May 31 22 28.28 23 26.5 4.581 4.554 82 15.4 5:29 (187, 31) C/2024 J2 ( Wierzchos ) Brightened rapidly. Now it is 14.6 mag (Jan. 31, Thomas Lehmann). Fading slowly. It locates somewhat low in the Northern Hemisphere. 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 24 1 35.53 11 27.9 2.710 1.988 36 15.4 5:25 (243, 16) May 31 1 47.21 10 1.6 2.679 2.026 41 15.5 5:29 (241, 20) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 15.5 mag (May 24, Martin Masek). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 23 21.23 33 37.0 3.460 3.130 62 15.4 5:25 (204, 17) May 31 23 26.68 35 55.9 3.443 3.178 66 15.5 5:29 (198, 16) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 15.9 mag (Apr. 29, Ken-ichi Kadota). 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) May 24 19 41.57 -20 29.8 5.315 6.005 129 15.6 3:36 (180, 75) May 31 19 38.35 -20 0.3 5.188 5.963 136 15.5 3:05 (180, 75) C/2024 L5 ( ATLAS ) Now it is 15.3 mag (May 13, Ken-ichi Kadota). 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 11 24.92 -9 56.4 2.988 3.504 112 15.6 19:16 (180, 65) May 31 11 17.80 -8 18.4 3.134 3.518 103 15.7 18:42 (180, 63) C/2023 T3 ( Fuls ) Now it is 15.3 mag (May 4, Toshiyuki Takahashi). Fading slowly. 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 24 13 6.79 -27 29.8 2.880 3.708 139 15.7 20:58 (180, 83) May 31 13 7.98 -26 26.6 2.954 3.727 133 15.8 20:32 (180, 82) P/2023 S1 ( PanSTARRS ) It brightened up to 14.4 mag in winter (Feb. 4, Ken-ichi Kadota). Now it is 16.2 mag (May 13, ATLAS South Africa). Fading slowly. It will be getting lower gradually after this, and it will be unobservable in July in the Northern Hemisphere, or in September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 9 21.41 11 41.0 2.724 2.673 76 15.7 18:28 (156, 40) May 31 9 30.14 10 50.0 2.816 2.681 71 15.8 18:26 (151, 40) C/2023 F3 ( ATLAS ) Now it is 16.2 mag (May 8, Ken-ichi Kadota). It stays 17 mag for a while. It will be unobservable in June in the Northern Hemisphere, or in September 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 24 10 43.70 -32 26.9 4.836 5.257 109 16.1 18:35 (180, 87) May 31 10 40.41 -30 58.5 4.946 5.266 102 16.2 18:26 (130, 84) C/2023 H5 ( Lemmon ) Now it is 15.6 mag (May 14, Alfons Diepvens). It stays 16 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 24 10 35.80 65 33.4 4.482 4.324 74 16.2 18:28 (180,-10) May 31 10 36.38 65 20.5 4.547 4.320 70 16.2 18:26 (177,-10) 496P/2024 S3 ( Hill ) First return of a new periodic comet which brightened up to 15 mag in 2010. Now it is 16.0 mag (May 11, ATLAS-HKO, Haleakala). It will fade out rapidly after this. It will be fainter than 18 mag in July. It locates somewhat low in the Northern Hemisphere. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 8 21.69 32 21.2 2.149 1.831 58 16.3 18:28 (151, 16) May 31 8 42.67 31 1.1 2.229 1.869 56 16.5 18:26 (150, 17) 47P/Ashbrook-Jackson Now it is 17.1 mag (May 7, ATLAS Chile). Brightening 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 24 22 55.86 -15 47.9 2.882 2.947 83 16.5 5:25 (230, 63) May 31 23 2.43 -15 6.6 2.780 2.936 88 16.3 5:29 (218, 66) C/2022 R6 ( PanSTARRS ) Now it is 16.2 mag (May 13, 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 will be getting lower gradually after this, and it will be unobservable in July. But it will be observable again in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 7 10.81 -13 14.7 7.087 6.596 57 16.4 18:28 (102, 39) May 31 7 15.56 -12 39.8 7.151 6.592 53 16.5 18:26 ( 99, 35) C/2019 U5 ( PanSTARRS ) Now it is 16.4 mag (May 4, 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 5 34.19 -36 44.1 7.874 7.442 61 16.8 18:28 ( 64, 30) May 31 5 36.76 -36 28.7 7.936 7.487 60 16.8 18:26 ( 62, 26) 88P/Howell It will brighten up to 9 mag in 2026 spring. Now it is 17.3 mag (Apr. 30, Andrew Pearce). Brightening gradually. It will be getting lower gradually after this, and it will be unobservable in August in the Northern Hemisphere, or in September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 10 21.74 14 43.2 2.822 2.984 89 16.9 18:28 (176, 40) May 31 10 25.21 14 11.7 2.883 2.944 83 16.9 18:26 (169, 40) C/2019 E3 ( ATLAS ) Very far object. Now it is 16.9 mag (Dec. 20, ATLAS Chile). 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 24 1 25.83 -53 13.8 10.836 10.730 81 17.0 5:25 (313, 46) May 31 1 27.59 -53 18.9 10.781 10.740 84 17.0 5:29 (313, 50) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 16.6 mag (May 15, ATLAS South Africa). It stays 17 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 24 22 16.70 -67 37.0 7.089 7.460 107 17.0 5:25 (352, 57) May 31 22 13.12 -68 36.2 7.075 7.512 111 17.0 5:29 (358, 57) C/2021 S3 ( PanSTARRS ) It brightened up to 9.6 mag from February to March in 2024 (Feb. 25, 2024, Thomas Lehmann). Now it is 17.0 mag (May 4, Ken-ichi Kadota). 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 24 23 35.76 39 35.1 6.022 5.575 59 17.1 5:25 (204, 10) May 31 23 38.54 40 16.7 6.016 5.637 63 17.2 5:29 (198, 11) C/2023 Q1 ( PanSTARRS ) It brightened up to 13.8 mag in winter (Dec. 30, Thomas Lehmann). Now it is 17.2 mag (May 2, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will be getting lower gradually. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 9 20.16 39 53.3 3.380 3.161 68 17.1 18:28 (165, 13) May 31 9 29.33 38 0.6 3.499 3.203 64 17.3 18:26 (162, 14) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 17.7 mag (May 13, Jean-Claude Merlin). 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 24 11 51.06 -57 17.8 9.688 10.259 121 17.2 19:43 ( 0, 68) May 31 11 50.59 -56 47.2 9.772 10.302 118 17.2 19:15 ( 0, 68) 362P/(457175) 2008 GO98 Now it is 17.4 mag (Sept. 20, Taras Prystavski). 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 24 21 47.58 2 15.0 3.063 3.271 92 17.2 5:25 (187, 52) May 31 21 50.74 2 50.9 2.984 3.287 98 17.2 5:17 (180, 52) C/2024 G2 ( ATLAS ) Now it is 17.3 mag (May 6, ATLAS Chile). It stays 18 mag for a while. It will be unobservable in July in the Northern Hemisphere, or in September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 11 5.80 -28 5.6 4.873 5.350 112 17.2 18:57 (180, 83) May 31 11 4.53 -26 25.3 4.970 5.349 106 17.3 18:29 (180, 81) C/2024 T5 ( ATLAS ) Now it is 18.0 mag (Feb. 2, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it stays observable in good condition. It is expected to brighten up to 13 mag in winter between 2026 and 2027. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 2 28.54 -37 19.8 7.404 6.988 62 17.3 5:25 (296, 32) May 31 2 34.18 -37 14.1 7.309 6.945 65 17.2 5:29 (294, 36) 195P/Hill Now it is 17.1 mag (May 1, A. Nagy Melykuti). 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 will be getting lower gradually after this, and it will be unobservable in July. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 7 5.06 -5 17.7 5.009 4.453 51 17.3 18:28 (109, 33) May 31 7 11.66 -5 22.6 5.068 4.451 47 17.3 18:26 (105, 30) 302P/Lemmon-PanSTARRS Now it is 17.3 mag (Oct. 31, ATLAS Chile). 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 0 5.34 -3 26.9 3.642 3.307 62 17.4 5:25 (237, 42) May 31 0 12.64 -2 51.2 3.558 3.310 67 17.4 5:29 (230, 46) C/2024 X2 ( ATLAS ) Now it is 17.3 mag (May 6, ATLAS Chile). It stays 18 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in September. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in August. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 7 44.16 -25 4.8 3.907 3.697 70 17.4 18:28 ( 93, 52) May 31 7 49.01 -23 2.2 3.988 3.691 65 17.5 18:26 ( 93, 47) 13P/Olbers It returned for the first time in 68 years. It brightened up to 6.2 mag in early last summer (July 1, Virgilio Gonano). Now it is 16.3 mag (May 10, ATLAS Chile). 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 24 18 27.84 -26 38.3 3.289 4.170 146 17.5 2:23 (180, 82) May 31 18 21.72 -27 16.3 3.298 4.235 154 17.6 1:49 (180, 82) C/2024 G6 ( ATLAS ) Now it is 16.9 mag (May 9, ATLAS South Africa). 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) May 24 16 42.32 -21 30.2 5.688 6.690 170 17.5 0:38 (180, 77) May 31 16 36.19 -20 44.1 5.663 6.677 178 17.5 0:04 (180, 76) 12P/Pons-Brooks It returns for the first time in 70 years. It brightened up to 3.7 mag in early April in 2024 (Apr. 6, 2024, Jose Guilherme Aguiar). Now it is 17.9 mag (Mar. 14, ATLAS Chile). Fading slowly. It will be fainter than 18 mag in June. 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 24 16 12.04 -50 5.8 4.154 5.061 150 17.6 0:08 ( 0, 75) May 31 16 3.38 -49 22.6 4.207 5.124 151 17.7 23:27 ( 0, 76) C/2024 G4 ( PanSTARRS ) Now it is 17.9 mag (May 5, Alfons Diepvens). 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) May 24 16 59.45 17 12.4 4.611 5.422 139 17.7 0:54 (180, 38) May 31 16 56.97 17 20.6 4.581 5.400 140 17.6 0:24 (180, 38) C/2023 V1 ( Lemmon ) Now it is 17.5 mag (Apr. 28, Yasukazu Ikari). 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 August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 18 11.78 63 14.1 4.965 5.107 92 17.6 2:06 (180, -8) May 31 17 53.16 63 37.5 4.949 5.103 93 17.6 1:20 (180, -9) C/2024 B1 ( Lemmon ) It brightened up to 13.1 mag in autumn (Nov. 1, Thomas Lehmann). Now it is 16.9 mag (May 14, Ken-ichi Kadota). Fading gradually. 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 24 17 8.66 8 59.3 2.372 3.263 146 17.8 1:04 (180, 46) May 31 16 58.54 7 44.9 2.415 3.329 149 17.9 0:26 (180, 47) C/2023 U1 ( Fuls ) Now it is 17.3 mag (Mar. 6, 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 24 3 14.76 -48 9.4 5.524 5.259 69 17.8 5:25 (311, 28) May 31 3 17.42 -48 34.5 5.495 5.277 72 17.8 5:29 (310, 32) C/2023 H1 ( PanSTARRS ) Now it is 16.7 mag (May 13, ATLAS South Africa). 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) May 24 20 19.84 -19 58.2 4.080 4.671 120 17.9 4:14 (180, 75) May 31 20 19.58 -19 34.4 4.010 4.689 126 17.9 3:46 (180, 75) C/2022 U1 ( Leonard ) Now it is 17.6 mag (Apr. 26, Yasukazu Ikari). 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) May 24 19 16.33 15 57.3 4.872 5.449 119 17.9 3:11 (180, 39) May 31 19 9.63 15 50.7 4.828 5.484 125 17.9 2:37 (180, 39) C/2024 N4 ( Sarneczky ) Now it is 17.8 mag (Apr. 17, Taras Prystavski). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 24 8 14.95 52 30.2 5.967 5.488 57 17.9 18:28 (159, -3) May 31 8 21.89 51 21.9 6.047 5.498 53 18.0 18:26 (156, -3)