Weekly Information about Bright Comets (2025 Aug. 23: South)

Japanese version Home page	Updated on August 25, 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.

C/2025 A6 ( Lemmon ) It brightened very rapidly. It is expected to brighten up to 4-5 mag from October to November. Now it is 11.8 mag (Aug. 19, Michael Jager). Brightening rapidly. In the Northern Hemisphere, it will be unobservable in November. In the Southern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 7 44.12 30 36.4 2.299 1.630 38 11.4 5:06 (233, -2) Aug. 30 7 55.02 31 33.3 2.094 1.520 42 10.9 4:58 (231, -1) C/2025 K1 ( ATLAS ) It is expected to brighten up to 7.5 mag in October. Now it is 11.7 mag (Aug. 14, Juan Jose Gonzalez). It brightens up to 7.5 mag, but it will turn to fade out rapidly after that. 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 October in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 16 0.52 3 37.7 0.648 1.177 87 11.5 18:59 (154, 49) Aug. 30 15 13.54 -2 47.8 0.751 1.042 70 11.3 19:03 (125, 44) C/2024 E1 ( Wierzchos ) It is expected to brighten up to 5 mag in 2026 January. Now it is 13.9 mag (July 30, Osamu Miyazaki). It will brighten rapidly after this. It will be unobservable in October 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. 23 15 54.37 40 40.8 2.647 2.666 80 13.4 18:59 (166, 13) Aug. 30 15 54.52 37 41.5 2.607 2.572 76 13.2 19:03 (159, 14) 240P/NEAT Now it is brighter than originally expected. Now it is 14.0 mag (Aug. 5, Thomas Lehmann). Brightening slowly. It stays observable in good condition. It is expected to brighten up to 12 mag and to be observable in good condition from autumn to winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 3 45.49 -1 56.6 1.983 2.315 95 13.6 5:06 (196, 56) Aug. 30 3 53.08 -1 37.2 1.890 2.295 100 13.5 4:58 (190, 56) C/2022 N2 ( PanSTARRS ) Now it is 13.9 mag (Aug. 5, Osamu Miyazaki). It stays 13 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. 23 3 22.54 24 28.5 3.604 3.830 95 13.6 5:06 (183, 30) Aug. 30 3 26.78 24 54.6 3.513 3.834 100 13.6 4:55 (180, 30) C/2021 G2 ( ATLAS ) Now it is 14.1 mag (Aug. 4, Ken-ichi Kadota). It stays 14 mag for a while. It will be getting lower gradually after this, and it will be unobservable in October in the Southern Hemisphere, or in November in the Northern Hemisphere. But it will be observable again in December in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 15 15.17 -0 37.4 5.779 5.644 77 14.1 18:59 (137, 47) Aug. 30 15 18.47 -0 40.4 5.904 5.669 71 14.1 19:03 (129, 43) 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 15.5 mag (Aug. 10, Erik Bryssinck). It will brighten rapidly after this. It will be unobservable in October. But it will be observable again in November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 15 52.08 -15 29.2 2.611 2.791 89 14.5 18:59 (135, 64) Aug. 30 15 34.46 -14 42.3 2.582 2.576 78 14.2 19:03 (118, 56) C/2023 R1 ( PanSTARRS ) It is expected to brighten up to 13 mag in early summer in 2026. Now it is 14.8 mag (July 31, Andrew Pearce). It stays 14 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 December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 20 29.34 21 6.0 3.321 4.142 139 14.3 22:21 (180, 34) Aug. 30 20 16.62 19 34.1 3.326 4.111 135 14.2 21:40 (180, 35) 29P/Schwassmann-Wachmann 1 Now it is not observable. It will appear in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 10 31.52 5 23.1 7.290 6.292 8 14.3 18:59 ( 89,-10) Aug. 30 10 36.29 4 51.4 7.299 6.292 4 14.3 19:03 ( 85,-15) 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 will be getting higher gradually. In the Southern Hemisphere, 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) Aug. 23 8 21.85 18 37.7 6.365 5.478 26 14.9 5:06 (248, -1) Aug. 30 8 28.23 18 39.7 6.310 5.477 31 14.9 4:58 (246, 1) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 14.8 mag (Aug. 5, Thomas Lehmann). Fading slowly. 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. 23 0 47.85 57 4.6 4.396 4.741 103 14.9 2:44 (180, -2) Aug. 30 0 33.52 56 58.8 4.346 4.778 109 14.9 2:02 (180, -2) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 14.5 mag (July 31, Andrew Pearce). 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 December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 18 40.04 -13 46.3 4.779 5.477 129 15.0 20:33 (180, 69) Aug. 30 18 36.90 -13 17.6 4.834 5.438 122 15.0 20:02 (180, 68) 217P/LINEAR Now it is 14.5 mag (Aug. 4, Ken-ichi Kadota). Fading gradually. In the Northern Hemisphere, it will be getting higher gradually. It locates somewhat low in the Southern Hemisphere. But it will become high in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 7 9.01 15 49.2 2.235 1.655 43 15.0 5:06 (239, 14) Aug. 30 7 25.15 15 33.2 2.243 1.709 46 15.2 4:58 (238, 15) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.0 mag (July 29, Andrew Pearce). 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) Aug. 23 5 30.08 -68 52.9 14.719 14.816 93 15.0 5:06 (341, 51) Aug. 30 5 33.49 -69 21.6 14.701 14.794 93 15.0 4:58 (343, 52) 43P/Wolf-Harrington Now it is 16.5 mag (Apr. 7, Alfons Diepvens). It stays 15 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. 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) Aug. 23 8 18.74 14 15.2 3.309 2.447 26 15.1 5:06 (251, 2) Aug. 30 8 32.04 13 13.7 3.273 2.450 29 15.1 4:58 (251, 4) 65P/Gunn Now it is 14.4 mag (July 28, Andrew Pearce). Fading slowly. It locates somewhat low in the Northern Hemisphere. But it will become high in summer. 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. 23 18 15.51 -32 18.5 2.269 2.946 123 15.5 20:09 (180, 87) Aug. 30 18 17.40 -32 11.4 2.353 2.950 116 15.6 19:43 (180, 87) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 15.3 mag (Aug. 4, Thomas Lehmann). Fading slowly. 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) Aug. 23 23 16.40 57 23.2 3.332 3.793 109 15.5 1:13 (180, -2) Aug. 30 23 8.20 58 3.4 3.347 3.847 112 15.6 0:37 (180, -3) 47P/Ashbrook-Jackson Now it is 16.0 mag (Aug. 7, ATLAS Chile). 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) Aug. 23 23 13.43 -11 37.1 1.848 2.833 163 15.8 1:10 (180, 66) Aug. 30 23 8.27 -11 36.9 1.826 2.828 171 15.8 0:37 (180, 66) 60P/Tsuchinshan 2 The condition is bad. It is hardly observable in this apparition. 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. 23 9 49.45 11 11.6 2.684 1.678 4 15.9 5:06 (266,-14) Aug. 30 10 8.14 9 24.9 2.693 1.692 6 15.9 4:58 (268,-13) C/2024 T5 ( ATLAS ) Now it is 15.9 mag (Aug. 3, ATLAS South Africa). It stays 16 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. It is expected to brighten up to 12 mag in winter between 2026 and 2027. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 3 22.62 -41 15.6 6.076 6.429 105 16.0 5:06 (341, 83) Aug. 30 3 23.78 -41 55.0 5.986 6.386 108 16.0 4:51 ( 0, 83) 210P/Christensen It is expected to brighten up to 8 mag from late autumn to early winter. Now it is 18.7 mag (Aug. 3, Francois Kugel). Brightening rapidly. It will be unobservable in October in the Northern Hemisphere, or in November in the Southern Hemisphere. But it will be observable again in November in the Northern Hemisphere, or in December in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 20 38.73 -36 14.1 0.718 1.666 148 16.6 22:30 ( 0, 89) Aug. 30 20 15.03 -38 19.5 0.677 1.576 137 16.1 21:39 ( 0, 87) 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 16.8 mag (Aug. 12, ATLAS South Africa). Brightening slowly. In the Northern Hemisphere, it is not observable now. It locates somewhat low in the Southern Hemisphere. But it will become high in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 8 53.37 -72 44.6 2.348 2.477 85 16.3 5:06 (339, 35) Aug. 30 9 56.94 -72 7.8 2.350 2.416 81 16.2 4:58 (339, 31) C/2024 J2 ( Wierzchos ) It brightened rapidly up to 14.6 mag in winter (Jan. 31, Thomas Lehmann). Now it is 15.8 mag (Aug. 2, 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) Aug. 23 3 19.82 -21 11.9 2.179 2.631 105 16.4 5:06 (188, 76) Aug. 30 3 21.47 -24 57.9 2.171 2.690 110 16.6 4:49 (180, 80) 302P/Lemmon-PanSTARRS It brightened very rapidly, and it became brighter than expected. Now it is 16.7 mag (Aug. 7, ATLAS-MLO, Mauna Loa). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 0 54.18 -1 34.8 2.558 3.373 137 16.5 2:50 (180, 56) Aug. 30 0 52.46 -2 1.7 2.506 3.380 144 16.4 2:21 (180, 57) 48P/Johnson Now it is 15.9 mag (Aug. 5, ATLAS-HKO, Haleakala). Fading slowly. 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. 23 3 46.67 5 52.0 2.111 2.402 93 16.5 5:06 (193, 48) Aug. 30 3 52.37 5 44.1 2.055 2.429 99 16.6 4:58 (189, 49) C/2023 H5 ( Lemmon ) Now it is 16.1 mag (Aug. 10, Alfons Diepvens). 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) Aug. 23 12 14.26 63 6.6 4.815 4.335 56 16.5 18:59 (152,-24) Aug. 30 12 28.26 63 4.3 4.795 4.342 57 16.5 19:03 (151,-25) 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 getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 8 18.05 -10 6.9 7.371 6.566 34 16.5 5:06 (271, 17) Aug. 30 8 22.88 -10 12.2 7.335 6.566 37 16.5 4:58 (269, 20) C/2024 A1 ( ATLAS ) Now it is 16.5 mag (May 8, Thomas Lehmann). It stays 16 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 September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 8 10.08 25 10.3 4.757 3.924 30 16.5 5:06 (241, -3) Aug. 30 8 15.98 26 0.8 4.698 3.934 36 16.5 4:58 (239, -1) 78P/Gehrels 2 It will brighten up to 12 mag in 2026 summer. Now it is 16.9 mag (Aug. 12, ATLAS Chile). Brightening slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 19 59.30 -11 34.9 2.123 3.032 148 16.6 21:52 (180, 67) Aug. 30 19 55.53 -11 59.5 2.145 3.000 141 16.5 21:20 (180, 67) 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 16.1 mag (Aug. 5, Thomas Lehmann). Fading gradually. It will be fainter than 18 mag in October. In the Northern Hemisphere, it stays observable in good condition. 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. 23 18 1.89 22 27.4 4.432 4.886 110 16.6 19:54 (180, 33) Aug. 30 17 58.62 21 21.4 4.583 4.959 106 16.7 19:24 (180, 34) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. It is fading very slowly. Now it is 16.2 mag (Aug. 4, Thomas Lehmann). 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) Aug. 23 19 38.34 -74 2.2 7.667 8.131 114 16.7 21:32 ( 0, 51) Aug. 30 19 26.25 -73 35.2 7.780 8.182 110 16.7 20:52 ( 0, 52) C/2023 H1 ( PanSTARRS ) Now it is 16.4 mag (July 26, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag in December. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 19 48.40 -16 14.3 4.071 4.942 145 16.7 21:41 (180, 71) Aug. 30 19 46.80 -16 1.1 4.161 4.966 138 16.8 21:12 (180, 71) 21P/Giacobini-Zinner The condition is bad in this apparition. It brightened up to 11 mag in the SWAN images (Jan. 27, Vladimir Bezugly). Fading slowly. It will be fainter than 18 mag in October. In the Northern Hemisphere, it is not observable now, but it will appear in September. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 8 17.35 -3 21.9 2.935 2.135 31 16.8 5:06 (265, 13) Aug. 30 8 29.59 -4 28.7 2.965 2.197 33 17.1 4:58 (265, 15) C/2024 G6 ( ATLAS ) Now it is 16.9 mag (July 31, ATLAS South Africa). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in October in the Southern Hemisphere, or in November in the Northern Hemisphere. But it will be observable again in December in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 15 48.95 -12 51.4 6.501 6.547 88 16.9 18:59 (137, 62) Aug. 30 15 48.47 -12 27.7 6.616 6.538 81 16.9 19:03 (126, 57) C/2023 T3 ( Fuls ) Now it is 17.0 mag (Aug. 7, ATLAS Chile). It stays 18 mag for a while. 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) Aug. 23 14 9.32 -20 42.9 4.295 4.020 67 16.9 18:59 ( 98, 49) Aug. 30 14 17.02 -20 43.0 4.414 4.049 62 17.0 19:03 ( 94, 44) C/2019 E3 ( ATLAS ) Very far object. Now it is 16.6 mag (July 17, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in November. 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. 23 1 15.18 -57 0.6 10.301 10.873 122 16.9 3:11 ( 0, 68) Aug. 30 1 10.81 -57 17.1 10.301 10.885 123 16.9 2:39 ( 0, 68) 261P/Larson Now it is 17.6 mag (Aug. 5, Jean-Gabriel Bosch). 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. 23 19 45.27 -17 52.1 1.332 2.237 145 17.1 21:38 (180, 73) Aug. 30 19 43.08 -17 40.6 1.360 2.215 137 17.0 21:08 (180, 73) C/2023 U1 ( Fuls ) It continues brightening even after the perihelion passage. Now it is 17.3 mag (Aug. 3, ATLAS South Africa). 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) Aug. 23 3 2.73 -62 39.7 5.129 5.521 107 17.1 4:57 ( 0, 62) Aug. 30 2 52.51 -64 8.0 5.132 5.544 109 17.1 4:20 ( 0, 61) C/2019 U5 ( PanSTARRS ) Now it is 16.7 mag (Aug. 4, Thomas Lehmann). 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. 23 6 1.63 -39 31.1 8.198 8.022 76 17.2 5:06 (291, 56) Aug. 30 6 1.93 -40 11.4 8.190 8.067 79 17.2 4:58 (291, 60) C/2023 X2 ( Lemmon ) Now it is 17.5 mag (Mar. 22, S. Shurpakov). 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) Aug. 23 6 36.28 67 23.3 5.515 5.180 65 17.3 5:06 (199,-19) Aug. 30 6 49.13 68 41.0 5.435 5.171 69 17.2 4:58 (197,-20) C/2024 R4 ( PanSTARRS ) Brightening rapidly. It is expected to brighten up to 13 mag from 2027 to 2028. Now it is 16.8 mag (Aug. 9, 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 getting lower gradually after this, and it will be unobservable in December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 22 13.35 24 7.6 6.711 7.555 144 17.3 0:10 (180, 31) Aug. 30 22 8.27 24 10.6 6.655 7.515 146 17.3 23:32 (180, 31) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 16.1 mag (Aug. 9, W. Hasubick). 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. 23 6 16.06 27 22.4 9.897 9.373 56 17.3 5:06 (221, 14) Aug. 30 6 17.54 27 32.9 9.843 9.423 62 17.3 4:58 (218, 16) 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 17.7 mag (Aug. 9, Alfons Diepvens). 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. 23 23 24.39 44 45.5 5.793 6.374 121 17.4 1:20 (180, 10) Aug. 30 23 19.99 44 31.7 5.797 6.434 125 17.5 0:49 (180, 10) 493P/2024 Q2 ( LONEOS ) Now it is 17.3 mag (Aug. 6, ATLAS-MLO, Mauna Loa). 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) Aug. 23 4 42.08 42 36.3 4.041 3.919 75 17.6 5:06 (197, 10) Aug. 30 4 49.06 43 29.7 3.942 3.911 80 17.5 4:58 (194, 9) 486P/2024 H1 ( Leonard ) Now it is 17.3 mag (Aug. 3, ATLAS-MLO, Mauna Loa). 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. 23 0 44.47 7 11.9 1.661 2.495 136 17.5 2:40 (180, 48) Aug. 30 0 42.59 6 58.5 1.625 2.512 143 17.6 2:11 (180, 48) C/2024 N3 ( Sarneczky ) Now it is 17.7 mag (Aug. 2, ATLAS-MLO, Mauna Loa). It stays 18 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 16 24.67 56 57.5 5.148 5.118 82 17.6 18:59 (174, -2) Aug. 30 16 25.40 54 51.9 5.181 5.129 81 17.6 19:03 (170, -1) 351P/Wiegert-PanSTARRS Now it is brighter than expected. Now it is 17.5 mag (July 30, Ken-ichi Kadota). 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) Aug. 23 19 41.87 -14 40.3 2.352 3.228 144 17.6 21:34 (180, 70) Aug. 30 19 39.92 -14 33.6 2.422 3.237 137 17.7 21:05 (180, 69) C/2025 L2 ( MAPS ) Now it is 17.3 mag (Aug. 11, ATLAS South Africa). It stays 18 mag for a while. 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) Aug. 23 21 26.80 -44 48.2 2.193 3.081 145 17.6 23:18 ( 0, 80) Aug. 30 21 15.11 -47 30.6 2.227 3.055 138 17.6 22:39 ( 0, 77) C/2024 G4 ( PanSTARRS ) Now it is 17.7 mag (Aug. 11, Alfons Diepvens). It stays 18 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 November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 16 45.12 11 16.5 4.946 5.164 96 17.6 18:59 (173, 44) Aug. 30 16 47.39 10 24.0 5.015 5.147 91 17.6 19:03 (163, 43) 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 17.4 mag (Mar. 25, ATLAS South Africa). It stays 18 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. 23 6 37.04 -17 30.1 8.304 7.840 59 17.7 5:06 (263, 41) Aug. 30 6 38.87 -17 43.1 8.282 7.888 63 17.7 4:58 (260, 45) 491P/2024 K2 ( Spacewatch-PanSTARRS ) Now it is 17.5 mag (Aug. 10, 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) Aug. 23 19 42.44 -23 24.8 3.167 4.026 143 17.7 21:35 (180, 78) Aug. 30 19 40.32 -23 16.1 3.246 4.037 136 17.7 21:05 (180, 78) 105P/Singer Brewster It faded down to 20.0 mag, fainter than predicted by 3-4 mag, after the perihelion passage (Mar. 12, Taras Prystavski). However, it is brightening very rapidly after that. Now it is 18.0 mag (Aug. 3, Jean-Gabriel Bosch). 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. 23 19 55.79 -7 58.9 1.657 2.567 147 17.8 21:48 (180, 63) Aug. 30 19 54.35 -8 42.0 1.732 2.595 140 17.7 21:19 (180, 64) 145P/Shoemaker-Levy 5 Now it is 18.7 mag (July 31, ATLAS South Africa). Brightening slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 22 52.38 -24 21.2 1.384 2.371 163 17.9 0:49 (180, 79) Aug. 30 22 46.49 -24 38.6 1.349 2.337 164 17.7 0:15 (180, 79) C/2023 V1 ( Lemmon ) Now it is 17.6 mag (July 31, Ken-ichi Kadota). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. 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. 23 15 25.19 49 12.4 5.280 5.102 74 17.8 18:59 (164, 3) Aug. 30 15 23.18 47 27.0 5.335 5.106 71 17.8 19:03 (158, 2) 242P/Spahr Now it is 17.8 mag (Mar. 17, ATLAS Chile). It stays 18 mag for a while. It will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 7 13.26 -5 15.4 4.752 4.122 46 18.0 5:06 (257, 27) Aug. 30 7 20.33 -5 50.0 4.701 4.130 50 17.9 4:58 (255, 30) C/2025 K4 ( Siverd ) Now it is 17.5 mag (June 19, J. L. Virlichie, P. Traverse, H. Roy). 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) Aug. 23 16 40.24 -40 26.3 2.113 2.549 103 18.2 18:59 ( 40, 83) Aug. 30 16 50.52 -38 24.4 2.197 2.558 99 18.3 19:03 ( 67, 80) 414P/STEREO It is expected to brighten up to 12 mag from late September to early October. Now it is 20.7 mag (July 28, F. Ocana, M. Micheli, R. Kresken, L. Conversi). It brightens up to 12 mag, but it will turn to fade out rapidly after that. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in October. In the Southern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 6 47.71 39 40.1 0.947 0.863 52 20.3 5:06 (218, 0) Aug. 30 7 44.59 33 50.4 0.948 0.765 45 18.2 4:58 (228, -1) 362P/(457175) 2008 GO98 Now it is 18.3 mag (Aug. 1, Michael Jager). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 23 21 29.06 1 51.4 2.506 3.488 163 18.5 23:21 (180, 53) Aug. 30 21 25.12 1 5.0 2.538 3.505 160 18.6 22:50 (180, 54) P/2025 D4 ( ATLAS ) It continued brightening even after the perihelion passage. Now it is 17.7 mag (July 28, ATLAS South Africa). Fading slowly. It locates somewhat low in the Northern Hemisphere. 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. 23 15 4.61 -14 14.0 3.622 3.552 77 18.8 18:59 (120, 56) Aug. 30 15 11.63 -14 27.3 3.737 3.573 72 18.9 19:03 (113, 51)