Weekly Information about Bright Comets (2025 June 21: South)

Japanese version Home page	Updated on June 28, 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 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) June 21 4 0.64 12 29.8 2.051 1.275 29 13.3 5:37 (246, 11) June 28 4 24.97 13 34.3 2.071 1.302 30 13.4 5:38 (245, 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 13.7 mag (June 23, 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) June 21 19 13.40 29 3.1 3.538 4.198 124 13.5 1:18 (180, 26) June 28 19 2.83 28 57.5 3.586 4.277 127 13.6 0:40 (180, 26) C/2022 N2 ( PanSTARRS ) Now it is 15.0 mag (June 17, Thomas Lehmann). 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) June 21 2 21.44 18 46.6 4.409 3.842 50 14.1 5:37 (224, 23) June 28 2 29.60 19 33.2 4.328 3.837 55 14.0 5:38 (219, 25) 29P/Schwassmann-Wachmann 1 Now it is 13.0 mag (June 5, Osamu Miyazaki). 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 Northern Hemisphere, or in October in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 9 52.58 9 19.3 6.768 6.283 57 14.1 18:26 (134, 33) June 28 9 56.22 8 58.8 6.860 6.284 51 14.2 18:28 (128, 29) C/2021 G2 ( ATLAS ) Now it is 13.6 mag (June 21, Osamu Miyazaki). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 15 6.17 -2 14.9 4.690 5.438 133 14.2 21:07 (180, 57) June 28 15 5.16 -1 48.0 4.792 5.459 126 14.3 20:39 (180, 57) 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) June 21 3 12.47 -59 45.1 2.966 3.132 89 14.3 5:37 (323, 47) June 28 3 23.58 -61 52.2 3.014 3.226 92 14.5 5:38 (326, 49) 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 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) June 21 5 51.97 4 47.7 2.483 1.555 18 14.4 5:37 (269, -7) June 28 6 11.67 4 7.4 2.542 1.619 19 14.7 5:38 (268, -4) 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) June 21 2 17.51 2 56.4 2.563 2.183 57 14.7 5:37 (234, 36) June 28 2 29.89 3 38.6 2.520 2.204 60 14.8 5:38 (230, 38) 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 is not observable now, but it will appear in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 17 7.69 57 54.8 3.166 3.457 97 14.9 23:06 (180, -3) June 28 16 53.99 57 14.0 3.092 3.373 97 14.7 22:25 (180, -2) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 14.7 mag (June 20, Thomas Lehmann). It stays 15 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) June 21 1 52.26 52 6.9 4.937 4.421 54 14.8 5:37 (201, -2) June 28 1 50.43 52 48.8 4.890 4.455 59 14.8 5:38 (196, -1) 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. 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) June 21 22 12.77 24 55.3 4.127 4.444 101 15.1 4:17 (180, 30) June 28 22 5.23 25 15.6 3.983 4.409 108 14.9 3:42 (180, 30) C/2022 QE78 ( ATLAS ) Now it is 14.6 mag (May 10, Alfons Diepvens). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in August. In the Southern Hemisphere, it will be unobservable soon. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 7 21.95 17 48.3 6.451 5.510 20 15.0 18:26 (113, 1) June 28 7 28.50 17 58.9 6.478 5.504 15 15.0 18:28 (110, -3) 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) June 21 18 45.84 -30 58.0 1.926 2.926 166 15.1 0:51 (180, 86) June 28 18 40.44 -31 24.2 1.917 2.926 171 15.1 0:18 (180, 86) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 14.7 mag (May 24, 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) June 21 4 46.79 -65 47.5 14.982 15.021 90 15.1 5:37 (330, 36) June 28 4 52.24 -65 59.8 14.944 14.998 91 15.1 5:38 (330, 39) 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) June 21 6 10.59 20 7.0 3.477 2.465 4 15.3 18:26 (105,-14) June 28 6 25.23 19 48.2 3.473 2.459 3 15.2 5:38 (257,-16) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 15.5 mag (June 23, Thomas Lehmann). 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) June 21 19 25.38 -18 29.0 4.880 5.840 159 15.3 1:30 (180, 73) June 28 19 20.20 -17 57.6 4.806 5.799 166 15.2 0:57 (180, 73) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 14.7 mag (June 22, 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) June 21 23 38.75 42 40.0 3.390 3.325 77 15.6 5:37 (181, 12) June 28 23 41.05 44 48.3 3.373 3.375 81 15.6 5:17 (180, 10) 49P/Arend-Rigaux Now it is 14.5 mag (May 23, Thomas Lehmann). Fading gradually. It will be fainter than 18 mag in August. It will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 8 11.77 24 29.7 2.421 1.629 30 15.6 18:26 (125, 6) June 28 8 33.82 24 5.2 2.481 1.666 28 15.8 18:28 (124, 5) 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) June 21 5 52.18 -28 2.4 1.610 1.260 51 15.6 5:37 (296, 12) June 28 5 59.74 -31 54.1 1.681 1.388 55 16.0 5:38 (297, 18) C/2024 J2 ( Wierzchos ) It brightened rapidly up to 14.6 mag in winter (Jan. 31, 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) June 21 2 19.36 4 52.8 2.554 2.153 55 15.7 5:37 (233, 34) June 28 2 29.05 2 49.6 2.506 2.200 60 15.8 5:38 (230, 39) 47P/Ashbrook-Jackson Now it is 16.9 mag (June 24, ATLAS South Africa). It stays 16 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 23 18.02 -13 22.0 2.480 2.903 104 16.0 5:22 (180, 68) June 28 23 21.60 -12 54.8 2.385 2.894 109 15.9 4:58 (180, 68) C/2025 K1 ( ATLAS ) It is expected to brighten up to 7.5 mag in October. Now it is 15.6 mag (June 25, Roland Fichtl). 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 June in the Northern Hemisphere, or 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) June 21 22 19.25 19 13.8 1.766 2.232 103 16.4 4:23 (180, 36) June 28 22 12.00 20 26.1 1.552 2.125 109 15.9 3:48 (180, 34) C/2023 T3 ( Fuls ) Now it is 16.2 mag (June 15, ATLAS South Africa). Fading slowly. In the Northern Hemisphere, it will be unobservable in October. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 13 15.94 -23 46.2 3.230 3.789 116 16.0 19:18 (180, 79) June 28 13 19.94 -23 4.3 3.336 3.811 110 16.1 18:54 (180, 78) 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 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) June 21 9 58.27 8 0.8 3.082 2.710 59 16.1 18:26 (134, 35) June 28 10 8.11 6 59.4 3.166 2.721 55 16.2 18:28 (129, 33) C/2024 L5 ( ATLAS ) Now it is 16.3 mag (June 9, ATLAS Chile). Fading slowly. It will be unobservable in July 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) June 21 11 5.11 -4 41.7 3.602 3.566 79 16.1 18:26 (144, 55) June 28 11 3.13 -3 51.4 3.758 3.584 72 16.3 18:28 (134, 50) C/2023 H5 ( Lemmon ) Now it is 16.6 mag (June 23, Thomas Lehmann). 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) June 21 10 46.67 64 35.9 4.708 4.313 61 16.3 18:26 (170,-11) June 28 10 52.59 64 21.1 4.748 4.313 58 16.3 18:28 (167,-12) 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 will be unobservable soon. But it will be observable again in October. 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) June 21 10 35.64 -27 14.7 5.304 5.295 83 16.4 18:26 (101, 66) June 28 10 35.40 -26 14.8 5.426 5.306 77 16.4 18:28 ( 97, 59) C/2022 R6 ( PanSTARRS ) Now it is 16.2 mag (May 13, ATLAS South Africa). 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 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) June 21 7 30.74 -11 17.2 7.308 6.581 41 16.5 18:26 ( 90, 20) June 28 7 36.02 -10 56.9 7.347 6.578 38 16.5 18:28 ( 87, 15) 88P/Howell It will brighten up to 9 mag in 2026 spring. Now it is 17.6 mag (June 18, ATLAS-HKO, Haleakala). Brightening gradually. 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) June 21 10 40.45 12 10.9 3.047 2.821 67 16.6 18:26 (148, 37) June 28 10 46.92 11 22.6 3.094 2.778 62 16.5 18:28 (141, 35) 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) June 21 1 30.87 -53 53.4 10.615 10.772 96 17.0 5:37 (322, 62) June 28 1 31.17 -54 10.4 10.561 10.783 99 16.9 5:38 (328, 65) 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 August. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 5 44.76 -36 12.6 8.082 7.621 59 17.0 5:37 (302, 18) June 28 5 47.39 -36 17.1 8.118 7.665 60 17.0 5:38 (299, 22) C/2024 T5 ( ATLAS ) Now it is 16.4 mag (June 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 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) June 21 2 50.30 -37 21.9 7.005 6.815 75 17.1 5:37 (288, 51) June 28 2 55.30 -37 32.9 6.900 6.772 78 17.0 5:38 (287, 55) 362P/(457175) 2008 GO98 Now it is 18.6 mag (June 4, 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) June 21 21 55.18 4 10.2 2.763 3.336 115 17.1 3:59 (180, 51) June 28 21 54.90 4 24.8 2.697 3.352 122 17.1 3:31 (180, 50) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 15.5 mag (June 6, Martin Masek). 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) June 21 21 52.39 -71 29.2 7.082 7.668 121 17.1 3:57 ( 0, 54) June 28 21 41.68 -72 20.4 7.104 7.720 124 17.1 3:19 ( 0, 53) 302P/Lemmon-PanSTARRS Now it is 16.9 mag (June 21, 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) June 21 0 31.94 -1 26.1 3.293 3.322 82 17.2 5:37 (205, 54) June 28 0 37.33 -1 6.1 3.202 3.327 88 17.2 5:38 (196, 55) 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 17.6 mag (June 4, Toshihiko Ikemura, Hirohisa Sato). 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) June 21 23 43.40 42 13.6 5.968 5.825 77 17.2 5:37 (182, 13) June 28 23 43.76 42 48.4 5.944 5.887 81 17.3 5:20 (180, 12) 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) June 21 11 52.30 -55 19.2 10.067 10.431 108 17.3 18:26 ( 13, 69) June 28 11 53.82 -54 52.7 10.176 10.474 104 17.4 18:28 ( 23, 67) C/2024 G2 ( ATLAS ) Now it is 17.3 mag (June 4, 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. But it will be observable again in October in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 11 4.79 -22 5.5 5.298 5.349 87 17.4 18:26 (121, 68) June 28 11 6.01 -20 53.4 5.413 5.349 81 17.5 18:28 (113, 62) C/2024 G6 ( ATLAS ) Now it is 16.5 mag (June 1, 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) June 21 16 18.37 -18 22.8 5.697 6.640 156 17.5 22:19 (180, 73) June 28 16 13.00 -17 36.8 5.743 6.628 148 17.5 21:46 (180, 73) 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 17.6 mag (June 18, ATLAS Chile). Brightening gradually. 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) June 21 3 12.65 -53 19.5 2.974 3.053 84 17.7 5:37 (313, 48) June 28 3 30.00 -55 36.0 2.856 2.988 87 17.5 5:38 (317, 49) C/2024 G4 ( PanSTARRS ) Now it is 17.5 mag (June 14, ATLAS-MLO, Mauna Loa). 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) June 21 16 49.33 17 4.4 4.555 5.335 136 17.6 22:50 (180, 38) June 28 16 47.07 16 45.4 4.568 5.314 133 17.6 22:20 (180, 38) C/2024 X2 ( ATLAS ) Now it is 16.9 mag (June 13, ATLAS South Africa). It stays 18 mag for a while. 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 autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 21 8 4.88 -17 58.8 4.221 3.679 51 17.6 18:26 ( 89, 31) June 28 8 10.44 -16 37.1 4.291 3.677 47 17.6 18:28 ( 87, 25) 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) June 21 16 55.08 62 53.3 4.944 5.095 92 17.6 22:53 (180, -8) June 28 16 37.43 62 0.9 4.958 5.094 91 17.6 22:08 (180, -7) 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 in July. 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) June 21 4 19.39 -35 4.1 2.344 2.089 62 17.6 5:37 (292, 33) June 28 4 34.00 -38 35.9 2.275 2.103 67 17.7 5:38 (295, 37) 240P/NEAT It will brighten up to 14 mag and will be observable in good condition from autumn to winter. Now it is 17.0 mag (June 14, A. Sankovich). Brightening gradually. 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) June 21 2 15.51 -7 7.8 2.843 2.536 62 17.9 5:37 (243, 43) June 28 2 26.59 -6 19.9 2.750 2.509 65 17.7 5:38 (238, 46) C/2023 U1 ( Fuls ) Now it is 17.8 mag (June 18, 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) June 21 3 23.97 -50 38.4 5.387 5.332 81 17.8 5:37 (309, 46) June 28 3 25.39 -51 35.6 5.347 5.351 84 17.8 5:38 (311, 50) C/2023 H1 ( PanSTARRS ) Now it is 16.5 mag (June 22, ATLAS South Africa). Fading slowly. 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) June 21 20 14.97 -18 31.6 3.854 4.745 147 17.9 2:19 (180, 73) June 28 20 12.36 -18 13.2 3.824 4.764 154 17.9 1:49 (180, 73)