Weekly Information about Bright Comets (2025 Aug. 30: South)

Japanese version Home page	Updated on September 1, 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 10.4 mag (Aug. 28, 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. 30 7 55.02 31 33.3 2.094 1.520 42 10.9 4:58 (231, -1) Sept. 6 8 7.77 32 43.3 1.877 1.408 47 10.4 4:48 (230, -1) C/2025 K1 ( ATLAS ) It is expected to brighten up to 7.5 mag in October. Now it is 11.5 mag (Aug. 26, Chris Wyatt). It brightens up to 7.5 mag, but it will turn to fade out rapidly after that. It will be unobservable soon 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. 30 15 13.54 -2 47.8 0.751 1.042 70 11.3 19:03 (125, 44) Sept. 6 14 38.96 -7 28.9 0.875 0.902 56 11.0 19:08 (106, 34) C/2024 E1 ( Wierzchos ) It is expected to brighten up to 5 mag in 2026 January. Now it is 14.1 mag (Aug. 9, Taras Prystavski). 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. 30 15 54.52 37 41.5 2.607 2.572 76 13.2 19:03 (159, 14) Sept. 6 15 56.07 34 36.4 2.569 2.478 73 13.0 19:08 (152, 14) 240P/NEAT Now it is brighter than originally expected. Now it is 13.2 mag (Aug. 27, Osamu Miyazaki). 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. 30 3 53.08 -1 37.2 1.890 2.295 100 13.5 4:58 (190, 56) Sept. 6 3 59.82 -1 19.6 1.799 2.275 104 13.3 4:48 (185, 56) C/2022 N2 ( PanSTARRS ) Now it is 14.0 mag (Aug. 27, 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. 30 3 26.78 24 54.6 3.513 3.834 100 13.6 4:55 (180, 30) Sept. 6 3 30.30 25 17.9 3.425 3.839 106 13.5 4:31 (180, 30) 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 15.7 mag (Aug. 28, Michael Jager). Brightening gradually. 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. 30 15 34.46 -14 42.3 2.582 2.576 78 14.2 19:03 (118, 56) Sept. 6 15 17.81 -13 53.6 2.562 2.367 67 13.8 19:08 (107, 46) C/2021 G2 ( ATLAS ) Now it is 14.4 mag (Aug. 26, Chris Wyatt). It stays 15 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. 30 15 18.47 -0 40.4 5.904 5.669 71 14.1 19:03 (129, 43) Sept. 6 15 22.14 -0 44.6 6.026 5.694 66 14.2 19:08 (122, 38) 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. 30 20 16.62 19 34.1 3.326 4.111 135 14.2 21:40 (180, 35) Sept. 6 20 4.83 17 53.9 3.351 4.081 130 14.2 21:01 (180, 37) 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. 30 10 36.29 4 51.4 7.299 6.292 4 14.3 19:03 ( 85,-15) Sept. 6 10 41.05 4 19.2 7.297 6.293 4 14.3 4:48 (274,-13) 414P/STEREO It brightened very rapidly. Now it is 15.5 mag (Sept. 1, Michael Jager). It brightens up to 12 mag, but it will turn to fade out rapidly after that. It will be fainter than 18 mag in October. In the Northern Hemisphere, it will be unobservable in October. 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. 30 7 44.59 33 50.4 0.948 0.765 45 16.2 4:58 (228, -1) Sept. 6 8 34.90 26 30.3 0.981 0.673 39 14.7 4:48 (238, -1) 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. 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. 30 8 28.23 18 39.7 6.310 5.477 31 14.9 4:58 (246, 1) Sept. 6 8 34.45 18 41.8 6.247 5.476 37 14.9 4:48 (244, 4) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 14.7 mag (Aug. 19, 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 be observable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 30 0 33.52 56 58.8 4.346 4.778 109 14.9 2:02 (180, -2) Sept. 6 0 18.40 56 37.2 4.306 4.816 114 14.9 1:20 (180, -2) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 15.4 mag (Aug. 23, 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 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. 30 18 36.90 -13 17.6 4.834 5.438 122 15.0 20:02 (180, 68) Sept. 6 18 34.42 -12 49.8 4.898 5.399 114 15.0 19:32 (180, 68) 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 (Aug. 23, 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) Aug. 30 5 33.49 -69 21.6 14.701 14.794 93 15.0 4:58 (343, 52) Sept. 6 5 36.44 -69 51.1 14.685 14.771 92 15.0 4:48 (345, 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 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. 30 8 32.04 13 13.7 3.273 2.450 29 15.1 4:58 (251, 4) Sept. 6 8 45.05 12 8.8 3.233 2.455 33 15.1 4:48 (251, 6) 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. 30 7 25.15 15 33.2 2.243 1.709 46 15.2 4:58 (238, 15) Sept. 6 7 40.30 15 13.6 2.247 1.764 49 15.5 4:48 (238, 16) 65P/Gunn Now it is 15.7 mag (Aug. 25, Thomas Lehmann). 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. 30 18 17.40 -32 11.4 2.353 2.950 116 15.6 19:43 (180, 87) Sept. 6 18 20.49 -32 2.7 2.442 2.954 110 15.6 19:19 (180, 87) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 15.7 mag (Aug. 27, 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. 30 23 8.20 58 3.4 3.347 3.847 112 15.6 0:37 (180, -3) Sept. 6 22 59.57 58 28.2 3.367 3.901 114 15.7 0:01 (180, -4) 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. 30 20 15.03 -38 19.5 0.677 1.576 137 16.1 21:39 ( 0, 87) Sept. 6 19 50.03 -39 57.8 0.646 1.485 126 15.6 20:46 ( 0, 85) 47P/Ashbrook-Jackson Now it is 15.7 mag (Aug. 24, 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. 30 23 8.27 -11 36.9 1.826 2.828 171 15.8 0:37 (180, 66) Sept. 6 23 2.77 -11 35.3 1.818 2.824 174 15.8 0:04 (180, 66) 60P/Tsuchinshan 2 The condition is bad. It is hardly observable in this apparition. Fading gradually. It will be fainter than 18 mag in December. 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. 30 10 8.14 9 24.9 2.693 1.692 6 15.9 4:58 (268,-13) Sept. 6 10 26.41 7 35.4 2.701 1.709 8 15.9 4:48 (269,-12) 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. 30 3 23.78 -41 55.0 5.986 6.386 108 16.0 4:51 ( 0, 83) Sept. 6 3 24.30 -42 34.8 5.901 6.343 111 15.9 4:24 ( 0, 83) 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. 30 9 56.94 -72 7.8 2.350 2.416 81 16.2 4:58 (339, 31) Sept. 6 10 52.80 -70 41.0 2.364 2.356 77 16.1 4:48 (339, 28) 78P/Gehrels 2 It will brighten up to 12 mag in 2026 summer. Now it is 17.0 mag (Aug. 25, Thomas Lehmann). Brightening slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 30 19 55.53 -11 59.5 2.145 3.000 141 16.5 21:20 (180, 67) Sept. 6 19 52.78 -12 23.3 2.178 2.967 133 16.4 20:50 (180, 67) 302P/Lemmon-PanSTARRS It brightened very rapidly, and it became brighter than expected. Now it is 16.6 mag (Aug. 20, Thomas Lehmann). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 30 0 52.46 -2 1.7 2.506 3.380 144 16.4 2:21 (180, 57) Sept. 6 0 49.95 -2 32.0 2.464 3.387 151 16.4 1:51 (180, 57) 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 will be unobservable soon. But it will be observable again 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. 30 8 22.88 -10 12.2 7.335 6.566 37 16.5 4:58 (269, 20) Sept. 6 8 27.52 -10 19.2 7.291 6.566 41 16.5 4:48 (267, 22) C/2023 H5 ( Lemmon ) Now it is 16.6 mag (Aug. 19, 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) Aug. 30 12 28.26 63 4.3 4.795 4.342 57 16.5 19:03 (151,-25) Sept. 6 12 43.06 63 3.7 4.771 4.349 59 16.5 19:08 (150,-27) 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 will be unobservable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 30 8 15.98 26 0.8 4.698 3.934 36 16.5 4:58 (239, -1) Sept. 6 8 21.71 26 54.0 4.630 3.945 42 16.5 4:48 (236, 1) C/2024 J2 ( Wierzchos ) It brightened rapidly up to 14.6 mag in winter (Jan. 31, Thomas Lehmann). Now it is 15.6 mag (Aug. 22, 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. 30 3 21.47 -24 57.9 2.171 2.690 110 16.6 4:49 (180, 80) Sept. 6 3 21.70 -28 44.6 2.175 2.749 114 16.7 4:22 (180, 84) 48P/Johnson Now it is 16.0 mag (Aug. 20, Thomas Lehmann). 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. 30 3 52.37 5 44.1 2.055 2.429 99 16.6 4:58 (189, 49) Sept. 6 3 56.90 5 31.8 2.001 2.457 104 16.7 4:48 (183, 49) 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. 30 19 26.25 -73 35.2 7.780 8.182 110 16.7 20:52 ( 0, 52) Sept. 6 19 16.20 -73 3.1 7.900 8.233 105 16.8 20:15 ( 0, 52) 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 15.8 mag (Aug. 18, 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. 30 17 58.62 21 21.4 4.583 4.959 106 16.7 19:24 (180, 34) Sept. 6 17 56.27 20 16.7 4.740 5.032 101 16.9 19:08 (176, 35) C/2023 H1 ( PanSTARRS ) Now it is 16.6 mag (Aug. 10, ATLAS Chile). 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. 30 19 46.80 -16 1.1 4.161 4.966 138 16.8 21:12 (180, 71) Sept. 6 19 45.80 -15 47.8 4.260 4.991 131 16.9 20:43 (180, 71) 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. 30 19 43.08 -17 40.6 1.360 2.215 137 17.0 21:08 (180, 73) Sept. 6 19 42.48 -17 27.3 1.397 2.194 130 16.9 20:40 (180, 72) C/2024 G6 ( ATLAS ) Now it is 17.2 mag (Aug. 7, W. Hasubick). It stays 17 mag for a while. 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. 30 15 48.47 -12 27.7 6.616 6.538 81 16.9 19:03 (126, 57) Sept. 6 15 48.48 -12 6.1 6.727 6.530 74 16.9 19:08 (117, 51) 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. 30 1 10.81 -57 17.1 10.301 10.885 123 16.9 2:39 ( 0, 68) Sept. 6 1 6.02 -57 30.3 10.310 10.896 123 16.9 2:07 ( 0, 68) C/2023 T3 ( Fuls ) Now it is 17.0 mag (Aug. 7, ATLAS Chile). Fading slowly. It will be fainter than 18 mag in December. 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. 30 14 17.02 -20 43.0 4.414 4.049 62 17.0 19:03 ( 94, 44) Sept. 6 14 24.94 -20 45.5 4.530 4.079 57 17.1 19:08 ( 90, 39) 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. 30 2 52.51 -64 8.0 5.132 5.544 109 17.1 4:20 ( 0, 61) Sept. 6 2 39.86 -65 29.8 5.145 5.567 109 17.2 3:40 ( 0, 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. 30 6 49.13 68 41.0 5.435 5.171 69 17.2 4:58 (197,-20) Sept. 6 7 2.58 70 1.3 5.355 5.161 73 17.2 4:48 (196,-21) C/2024 R4 ( PanSTARRS ) Brightening rapidly. It is expected to brighten up to 13 mag from 2027 to 2028. Now it is 17.4 mag (Aug. 18, 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 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. 30 22 8.27 24 10.6 6.655 7.515 146 17.3 23:32 (180, 31) Sept. 6 22 3.17 24 8.9 6.614 7.475 146 17.2 23:00 (180, 31) C/2019 U5 ( PanSTARRS ) Now it is 16.7 mag (Aug. 4, Thomas Lehmann). It stays 17 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. 30 6 1.93 -40 11.4 8.190 8.067 79 17.2 4:58 (291, 60) Sept. 6 6 1.75 -40 53.8 8.180 8.111 82 17.3 4:48 (293, 63) 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. 30 6 17.54 27 32.9 9.843 9.423 62 17.3 4:58 (218, 16) Sept. 6 6 18.72 27 43.8 9.784 9.473 69 17.3 4:48 (215, 18) 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. 30 4 49.06 43 29.7 3.942 3.911 80 17.5 4:58 (194, 9) Sept. 6 4 55.47 44 23.5 3.841 3.902 85 17.4 4:48 (192, 9) 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. 30 23 19.99 44 31.7 5.797 6.434 125 17.5 0:49 (180, 10) Sept. 6 23 15.49 44 10.6 5.811 6.494 129 17.5 0:17 (180, 11) 486P/2024 H1 ( Leonard ) Now it is 17.3 mag (Aug. 3, ATLAS-MLO, Mauna Loa). Fading gradually. 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. 30 0 42.59 6 58.5 1.625 2.512 143 17.6 2:11 (180, 48) Sept. 6 0 39.63 6 37.2 1.598 2.530 151 17.6 1:40 (180, 48) 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. 30 22 46.49 -24 38.6 1.349 2.337 164 17.7 0:15 (180, 79) Sept. 6 22 40.18 -24 46.8 1.325 2.303 161 17.6 23:37 (180, 80) 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. 30 21 15.11 -47 30.6 2.227 3.055 138 17.6 22:39 ( 0, 77) Sept. 6 21 3.43 -49 50.6 2.276 3.029 130 17.6 22:00 ( 0, 75) 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. 30 16 25.40 54 51.9 5.181 5.129 81 17.6 19:03 (170, -1) Sept. 6 16 27.06 52 47.4 5.218 5.141 80 17.6 19:08 (165, 0) C/2024 G4 ( PanSTARRS ) Now it is 17.7 mag (Aug. 11, Alfons Diepvens). It stays 18 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. 30 16 47.39 10 24.0 5.015 5.147 91 17.6 19:03 (163, 43) Sept. 6 16 50.22 9 31.3 5.086 5.131 86 17.6 19:08 (153, 42) 164P/Christensen Brightening slowly. In the Northern Hemisphere, it will be getting higher gradually. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 30 8 14.28 22 54.8 2.626 1.904 35 17.7 4:58 (241, 1) Sept. 6 8 31.25 22 39.8 2.613 1.935 38 17.6 4:48 (241, 2) 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. 30 6 38.87 -17 43.1 8.282 7.888 63 17.7 4:58 (260, 45) Sept. 6 6 40.36 -17 58.0 8.254 7.935 68 17.7 4:48 (257, 48) 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 soon. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 30 19 39.92 -14 33.6 2.422 3.237 137 17.7 21:05 (180, 69) Sept. 6 19 38.97 -14 26.8 2.501 3.247 130 17.8 20:37 (180, 69) 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. 30 19 54.35 -8 42.0 1.732 2.595 140 17.7 21:19 (180, 64) Sept. 6 19 54.12 -9 22.4 1.817 2.622 134 17.7 20:52 (180, 64) 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. 30 19 40.32 -23 16.1 3.246 4.037 136 17.7 21:05 (180, 78) Sept. 6 19 39.02 -23 5.6 3.334 4.049 129 17.8 20:37 (180, 78) C/2023 V1 ( Lemmon ) Now it is 17.7 mag (Aug. 10, Alfons Diepvens). 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 soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 30 15 23.18 47 27.0 5.335 5.106 71 17.8 19:03 (158, 2) Sept. 6 15 22.15 45 44.8 5.390 5.110 68 17.8 19:08 (152, 1) 242P/Spahr Now it is 17.8 mag (Mar. 17, ATLAS Chile). 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. 30 7 20.33 -5 50.0 4.701 4.130 50 17.9 4:58 (255, 30) Sept. 6 7 27.06 -6 27.4 4.645 4.139 54 17.9 4:48 (254, 32) 188P/LINEAR-Mueller Now it is 18.7 mag (Aug. 3, Francois Kugel). 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. 30 21 52.15 -21 45.2 1.982 2.966 163 18.0 23:17 (180, 77) Sept. 6 21 46.92 -21 43.2 1.989 2.943 157 17.9 22:44 (180, 77) C/2023 RS61 ( PanSTARRS ) Although it is around 20 mag usually, now it is bright in outburst. Now it is 17.5 mag (Aug. 26, Richard Miles). 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. 30 3 15.56 37 7.8 8.725 8.948 99 18.0 4:44 (180, 18) Sept. 6 3 15.66 37 25.5 8.610 8.938 105 18.0 4:16 (180, 17)