Weekly Information about Bright Comets (2025 July 5: South)

Japanese version Home page	Updated on July 8, 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.

217P/LINEAR Now it is 13.1 mag (June 22, Martin Masek). It will fade out rapidly after this. In the Northern Hemisphere, it will be unobservable soon. But it will be observable again 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) July 5 4 48.60 14 26.6 2.094 1.334 31 13.6 5:38 (243, 11) July 12 5 11.43 15 7.0 2.118 1.370 32 13.7 5:37 (242, 11) C/2023 A3 ( Tsuchinshan-ATLAS ) It brightened up to -3 mag due to the forward scattering in the SOHO coronagraph images (Oct. 9, 2024, Q.-c. Zhang, Charles S. Morris). It became a great comet of 0 mag on the ground. Now it is 14.0 mag (June 30, Thomas Lehmann). Fading gradually. 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) July 5 18 52.49 28 38.8 3.648 4.355 128 13.7 0:02 (180, 26) July 12 18 42.62 28 8.1 3.724 4.432 128 13.8 23:19 (180, 27) C/2022 N2 ( PanSTARRS ) Now it is 14.6 mag (June 16, Ken-ichi Kadota). It stays 14 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) July 5 2 37.53 20 17.9 4.244 3.833 59 14.0 5:38 (214, 27) July 12 2 45.18 21 0.5 4.157 3.829 64 13.9 5:37 (209, 28) 29P/Schwassmann-Wachmann 1 Now it is 14.6 mag (June 10, ATLAS South Africa). It will be unobservable soon in the Northern Hemisphere, or in August in the Southern Hemisphere. But it will be observable again in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 10 0.10 8 36.7 6.944 6.285 46 14.2 18:31 (122, 25) July 12 10 4.19 8 12.9 7.021 6.286 40 14.2 18:34 (117, 21) C/2021 G2 ( ATLAS ) Now it is 13.9 mag (June 29, Toshihiko Ikemura, Hirohisa Sato). It stays 15 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 15 4.65 -1 25.9 4.901 5.481 120 14.3 20:11 (180, 57) July 12 15 4.66 -1 8.5 5.018 5.503 113 14.4 19:43 (180, 56) C/2024 E1 ( Wierzchos ) It is expected to brighten up to 5 mag in 2026 January. Now it is 14.7 mag (June 26, Juan Jose Gonzalez). It will brighten rapidly after this. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable soon. But it will be observable again in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 16 40.97 56 11.5 3.022 3.288 95 14.6 21:45 (180, -1) July 12 16 29.13 54 47.8 2.957 3.202 94 14.4 21:06 (180, 0) 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) July 5 3 34.41 -64 3.3 3.068 3.319 95 14.6 5:38 (331, 50) July 12 3 44.88 -66 17.1 3.127 3.411 97 14.8 5:37 (335, 50) C/2023 R1 ( PanSTARRS ) It is expected to brighten up to 13 mag in early summer in 2026. Now it is 15.5 mag (June 20, Roland Fichtl). It stays 15 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) July 5 21 56.42 25 28.3 3.847 4.373 114 14.8 3:05 (180, 29) July 12 21 46.37 25 31.5 3.722 4.339 121 14.7 2:28 (180, 29) C/2025 K1 ( ATLAS ) It is expected to brighten up to 7.5 mag in October. Now it is 15.1 mag (July 6, ATLAS-HKO, Haleakala). Brightening rapidly. It will be getting lower gradually after this, and it will be unobservable in September in the Northern Hemisphere, or in October in the Southern Hemisphere. But it will be observable again in August in the Southern Hemisphere. It is not observable for a month around the perihelion passage. But in the Northern Hemisphere, it stays observable in good condition until mid September and after late October. In the Southern Hemisphere, it is observable only before the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 22 0.56 21 41.5 1.343 2.017 116 15.4 3:10 (180, 33) July 12 21 42.97 22 56.6 1.142 1.906 123 14.8 2:25 (180, 32) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 14.7 mag (June 30, Thomas Lehmann). It stays 15 mag for a while. 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) July 5 1 47.54 53 31.6 4.836 4.489 64 14.8 5:38 (192, 0) July 12 1 43.47 54 14.4 4.777 4.524 69 14.8 5:37 (187, 0) 48P/Johnson Now it is 15.4 mag (June 13, A. Sankovich). 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) July 5 2 41.79 4 15.2 2.476 2.226 64 14.8 5:38 (225, 40) July 12 2 53.16 4 46.2 2.429 2.249 67 14.9 5:37 (221, 42) C/2022 QE78 ( ATLAS ) Now it is 14.6 mag (May 10, Alfons Diepvens). It stays 15 mag for a while. Now it is not observable. It will appear 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) July 5 7 35.14 18 7.9 6.497 5.499 10 15.0 18:31 (107, -8) July 12 7 41.84 18 15.4 6.506 5.495 5 15.0 18:34 (103,-13) 21P/Giacobini-Zinner It brightened up to 11 mag in the SWAN images (Jan. 27, Vladimir Bezugly). It will fade out rapidly after this. It will be fainter than 18 mag in October. Now it is not observable. It will appear soon 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) July 5 6 30.40 3 22.6 2.600 1.684 20 15.0 5:38 (267, -2) July 12 6 48.18 2 33.8 2.657 1.750 21 15.3 5:37 (267, 0) 65P/Gunn Now it is 15.2 mag (June 3, Thomas Lehmann). 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) July 5 18 34.89 -31 46.3 1.921 2.927 169 15.1 23:40 (180, 87) July 12 18 29.52 -32 3.6 1.937 2.928 164 15.1 23:07 (180, 87) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 14.2 mag (June 29, Thomas Lehmann). It stays 15 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) July 5 4 57.61 -66 14.4 14.908 14.975 91 15.1 5:38 (331, 41) July 12 5 2.88 -66 31.3 14.874 14.953 92 15.1 5:37 (331, 43) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 15.2 mag (July 6, ATLAS Chile). 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) July 5 19 14.75 -17 25.8 4.748 5.758 173 15.2 0:24 (180, 72) July 12 19 9.18 -16 53.7 4.706 5.717 173 15.1 23:47 (180, 72) 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) July 5 6 39.84 19 24.1 3.465 2.454 5 15.2 5:38 (255,-13) July 12 6 54.40 18 54.7 3.453 2.450 7 15.2 5:37 (254,-10) 47P/Ashbrook-Jackson Now it is 16.6 mag (July 3, ATLAS Chile). 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) July 5 23 24.25 -12 31.7 2.293 2.884 115 15.8 4:33 (180, 67) July 12 23 25.91 -12 13.0 2.206 2.875 121 15.6 4:07 (180, 67) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 15.2 mag (July 1, Thomas Lehmann). Fading slowly. 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) July 5 23 42.32 46 51.9 3.358 3.426 85 15.7 4:51 (180, 8) July 12 23 42.46 48 49.8 3.345 3.478 88 15.7 4:23 (180, 6) C/2024 J2 ( Wierzchos ) It brightened rapidly up to 14.6 mag in winter (Jan. 31, Thomas Lehmann). Fading gradually. It will be fainter than 18 mag in November. 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) July 5 2 38.16 0 34.5 2.455 2.249 66 15.9 5:38 (227, 43) July 12 2 46.63 -1 53.3 2.404 2.300 71 15.9 5:37 (224, 48) C/2023 T3 ( Fuls ) Now it is 16.3 mag (June 29, Thomas Lehmann). Fading slowly. It will be unobservable 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) July 5 13 24.54 -22 28.6 3.448 3.835 104 16.2 18:31 (180, 78) July 12 13 29.68 -21 58.8 3.564 3.859 99 16.3 18:34 (155, 76) P/2023 S1 ( PanSTARRS ) It brightened up to 14.4 mag in winter (Feb. 4, Ken-ichi Kadota). Now it is 17.4 mag (June 14, ATLAS-HKO, Haleakala). Fading slowly. It will be unobservable soon 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) July 5 10 18.13 5 55.8 3.248 2.732 51 16.3 18:31 (123, 30) July 12 10 28.29 4 50.0 3.325 2.744 47 16.4 18:34 (118, 27) 88P/Howell It will brighten up to 9 mag in 2026 spring. Now it is 17.6 mag (June 18, ATLAS-HKO, Haleakala). It will brighten rapidly after this. 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) July 5 10 54.00 10 30.5 3.136 2.736 57 16.4 18:31 (135, 32) July 12 11 1.64 9 34.8 3.173 2.693 53 16.3 18:34 (129, 30) C/2023 H5 ( Lemmon ) Now it is 16.6 mag (July 1, Thomas Lehmann). It stays 17 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) July 5 10 59.60 64 7.1 4.781 4.313 57 16.4 18:31 (165,-13) July 12 11 7.61 63 54.1 4.807 4.314 55 16.4 18:34 (162,-14) C/2025 F2 ( SWAN ) It brightened rapidly up to 7.8 mag on Apr. 8 (Osamu Miyazaki). The nucleus was disintegrated, however, its remnant had been visible until mid May. Fading rapidly. It will be fainter than 18 mag in August. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 6 7.16 -35 39.9 1.746 1.512 59 16.4 5:38 (298, 24) July 12 6 14.42 -39 23.7 1.808 1.633 63 16.7 5:37 (300, 29) C/2024 L5 ( ATLAS ) Now it is 16.4 mag (July 2, ATLAS Chile). Fading slowly. It will be unobservable soon in the Northern Hemisphere, or in August in the Southern Hemisphere. But it will be observable again in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 11 2.00 -3 10.1 3.908 3.604 65 16.4 18:31 (126, 44) July 12 11 1.58 -2 36.6 4.052 3.624 58 16.5 18:34 (119, 38) C/2023 F3 ( ATLAS ) Now it is 16.7 mag (June 4, ATLAS Chile). It stays 17 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 lower gradually after this, and it will be unobservable in September. But it will be observable again in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 10 35.70 -25 22.3 5.546 5.317 71 16.5 18:31 ( 93, 53) July 12 10 36.45 -24 36.9 5.662 5.328 65 16.5 18:34 ( 90, 46) 3I/2025 N1 ( ATLAS ) Third interstellar object in history following 1I/'Oumuamua and 2I/Borisov. The eccentricity is extremely big as 6. It approaches to Sun down to 1.38 a.u. in late October. It is not observable around the perihelion passage. But it is expected to be observable at 12 mag before and after that time. Now it is 16.6 mag (July 6, John Maikner). It will brighten rapidly after this. It will be getting lower gradually after this, and it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 17 59.49 -18 38.6 3.412 4.406 166 17.1 23:04 (180, 74) July 12 17 43.54 -18 29.4 3.222 4.172 156 16.7 22:20 (180, 73) C/2024 T5 ( ATLAS ) Now it is 16.4 mag (July 1, ATLAS Chile). 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. 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) July 5 3 0.04 -37 48.2 6.793 6.729 82 16.9 5:38 (286, 60) July 12 3 4.49 -38 7.5 6.686 6.686 85 16.9 5:37 (286, 64) C/2019 E3 ( ATLAS ) Very far object. Now it is 16.8 mag (June 6, Taras Prystavski). 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) July 5 1 31.01 -54 29.6 10.510 10.794 103 16.9 5:38 (336, 68) July 12 1 30.37 -54 50.4 10.463 10.805 107 16.9 5:37 (346, 69) 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. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 5 49.92 -36 26.4 8.147 7.710 61 17.0 5:38 (297, 27) July 12 5 52.32 -36 40.4 8.170 7.755 62 17.1 5:37 (295, 32) 362P/(457175) 2008 GO98 Now it is 18.6 mag (June 4, Toshihiko Ikemura, Hirohisa Sato). 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) July 5 21 53.76 4 32.2 2.638 3.369 128 17.1 3:03 (180, 50) July 12 21 51.79 4 32.0 2.587 3.386 135 17.1 2:33 (180, 50) 302P/Lemmon-PanSTARRS Now it is 16.9 mag (July 7, ATLAS Chile). 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) July 5 0 42.12 -0 50.9 3.111 3.332 93 17.1 5:38 (186, 56) July 12 0 46.25 -0 40.7 3.020 3.337 99 17.1 5:27 (180, 56) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 16.6 mag (July 4, 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. It is brighter than this ephemeris recently. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 21 29.01 -73 5.6 7.137 7.772 125 17.2 2:40 ( 0, 52) July 12 21 14.55 -73 43.0 7.180 7.824 126 17.2 1:58 ( 0, 51) C/2025 L1 ( ATLAS ) It is expected to brighten up to 13.5 mag and to be observable in good condition in 2026 spring. Now it is 17.4 mag (July 4, ATLAS Chile). Brightening slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 3 49.89 -58 6.0 2.746 2.923 89 17.4 5:38 (321, 50) July 12 4 13.12 -60 46.6 2.647 2.858 91 17.2 5:37 (325, 50) 351P/Wiegert-PanSTARRS Now it is brighter than expected. Now it is 17.7 mag (July 3, ATLAS South Africa). Fading slowly. 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) July 5 20 12.50 -15 48.5 2.199 3.176 160 17.3 1:22 (180, 71) July 12 20 7.78 -15 34.4 2.181 3.183 167 17.3 0:50 (180, 71) 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 17.5 mag (June 26, Ken-ichi Kadota). 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) July 5 23 43.46 43 20.2 5.919 5.948 86 17.3 4:52 (180, 12) July 12 23 42.50 43 48.3 5.894 6.010 91 17.3 4:23 (180, 11) 240P/NEAT It will brighten up to 14 mag and will be observable in good condition from autumn to winter. Brightening gradually. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it stays observable in good condition. It was reported as very bright as 14.4 mag on July 7 (ATLAS Chile). Maybe it is in outburst. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 2 37.52 -5 35.3 2.655 2.483 69 17.5 5:38 (232, 48) July 12 2 48.26 -4 54.1 2.559 2.457 72 17.3 5:37 (227, 50) 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) July 5 11 55.77 -54 28.2 10.289 10.516 100 17.4 18:31 ( 31, 65) July 12 11 58.11 -54 6.1 10.406 10.559 95 17.5 18:34 ( 37, 62) C/2024 G2 ( ATLAS ) Now it is 17.7 mag (June 29, ATLAS South Africa). It stays 18 mag for a while. It will be unobservable in September in the Southern Hemisphere, or in October in the Northern Hemisphere. But it will be observable again in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 11 7.69 -19 48.5 5.528 5.351 74 17.5 18:31 (108, 56) July 12 11 9.77 -18 50.4 5.640 5.352 68 17.5 18:34 (103, 50) C/2024 G6 ( ATLAS ) Now it is 16.6 mag (June 18, Ken-ichi Kadota). It stays 18 mag for a while. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 16 8.06 -16 52.4 5.804 6.617 140 17.5 21:14 (180, 72) July 12 16 3.62 -16 10.0 5.879 6.606 132 17.5 20:42 (180, 71) C/2024 G4 ( PanSTARRS ) Now it is 17.7 mag (June 29, Toshihiko Ikemura, Hirohisa Sato). 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) July 5 16 45.12 16 19.9 4.590 5.294 129 17.5 21:51 (180, 39) July 12 16 43.56 15 48.6 4.620 5.274 125 17.5 21:22 (180, 39) C/2023 V1 ( Lemmon ) Now it is 17.6 mag (June 18, Alfons Diepvens). 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) July 5 16 21.58 60 52.6 4.978 5.093 90 17.6 21:25 (180, -6) July 12 16 7.79 59 31.1 5.006 5.093 89 17.6 20:44 (180, -4) 2024 XK14 Peculiar asteroid moving along a cometary orbit. Michael Mattiazzo detected a 25-arcsec tail on May 31. Now it is 17.8 mag (May 31, Michael Mattiazzo). It will fade out rapidly after this. It will be fainter than 18 mag soon. 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) July 5 4 50.41 -42 28.3 2.213 2.121 71 17.8 5:38 (299, 40) July 12 5 9.14 -46 38.7 2.162 2.141 75 17.9 5:37 (304, 42) C/2023 U1 ( Fuls ) Now it is 17.1 mag (July 4, 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) July 5 3 26.24 -52 40.4 5.307 5.371 88 17.8 5:38 (313, 54) July 12 3 26.40 -53 52.3 5.268 5.391 91 17.8 5:37 (317, 58) C/2023 H1 ( PanSTARRS ) Now it is 16.4 mag (July 5, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag soon. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 5 20 9.37 -17 55.9 3.807 4.785 162 17.9 1:19 (180, 73) July 12 20 6.12 -17 39.5 3.803 4.806 169 17.9 0:48 (180, 73)