Weekly Information about Bright Comets (2025 Sept. 6: South)

Japanese version Home page	Updated on September 7, 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 mag from October to November. Now it is 9.5 mag (Sept. 6, Virgilio Gonano). It brightens up to 4 mag, but it will turn to fade out rapidly after that. In the Northern Hemisphere, it will be unobservable in November. In the Southern Hemisphere, it is not observable now, but it will appear in December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 8 7.77 32 43.3 1.877 1.408 47 9.9 4:48 (230, -1) Sept.13 8 23.41 34 11.0 1.651 1.294 51 9.2 4:38 (228, -2) C/2025 K1 ( ATLAS ) It is expected to brighten up to 7.5 mag in October. Now it is 11.5 mag (Sept. 5, Virgilio Gonano). 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) Sept. 6 14 38.96 -7 28.9 0.875 0.902 56 11.0 19:08 (106, 34) Sept.13 14 11.58 -10 48.0 1.004 0.758 44 10.5 19:13 ( 93, 24) C/2024 E1 ( Wierzchos ) It is expected to brighten up to 5 mag in January. Now it is 13.8 mag (Aug. 30, Thomas Lehmann). 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) Sept. 6 15 56.07 34 36.4 2.569 2.478 73 13.0 19:08 (152, 14) Sept.13 15 58.90 31 26.6 2.532 2.382 69 12.8 19:13 (145, 13) 240P/NEAT Now it is brighter than originally expected. Now it is 13.2 mag (Aug. 31, Jose Guilherme Aguiar). 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) Sept. 6 3 59.82 -1 19.6 1.799 2.275 104 13.3 4:48 (185, 56) Sept.13 4 5.60 -1 2.8 1.711 2.256 109 13.2 4:38 (180, 56) 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 (Sept. 1, Thomas Lehmann). 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) Sept. 6 15 17.81 -13 53.6 2.562 2.367 67 13.8 19:08 (107, 46) Sept.13 15 2.13 -13 4.0 2.546 2.166 56 13.4 19:13 ( 99, 36) 414P/STEREO It brightened very rapidly. Now it is 15.5 mag (Sept. 1, Michael Jager). It brightens up to 12.5 mag, but it will turn to fade out rapidly after that. It will be fainter than 18 mag in November. 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) Sept. 6 8 34.90 26 30.3 0.981 0.673 39 14.7 4:48 (238, -1) Sept.13 9 19.38 18 27.5 1.044 0.595 33 13.4 4:38 (248, -1) C/2022 N2 ( PanSTARRS ) Now it is 13.5 mag (Sept. 1, Osamu Miyazaki). 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) Sept. 6 3 30.30 25 17.9 3.425 3.839 106 13.5 4:31 (180, 30) Sept.13 3 33.04 25 38.4 3.340 3.844 112 13.5 4:06 (180, 29) 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) Sept. 6 15 22.14 -0 44.6 6.026 5.694 66 14.2 19:08 (122, 38) Sept.13 15 26.15 -0 49.6 6.143 5.719 60 14.3 19:13 (116, 33) C/2023 R1 ( PanSTARRS ) It is expected to brighten up to 13 mag in early summer in 2026. Now it is 15.5 mag (Aug. 30, Thomas Lehmann). It stays 14 mag for a while. It will be getting lower gradually after this, and it will be unobservable in January 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) Sept. 6 20 4.83 17 53.9 3.351 4.081 130 14.2 21:01 (180, 37) Sept.13 19 54.17 16 8.8 3.396 4.051 124 14.2 20:23 (180, 39) 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) Sept. 6 10 41.05 4 19.2 7.297 6.293 4 14.3 4:48 (274,-13) Sept.13 10 45.78 3 46.5 7.285 6.294 9 14.3 4:38 (273,-10) 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) Sept. 6 8 34.45 18 41.8 6.247 5.476 37 14.9 4:48 (244, 4) Sept.13 8 40.49 18 44.4 6.176 5.476 42 14.8 4:38 (242, 6) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 14.8 mag (Aug. 31, 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) Sept. 6 0 18.40 56 37.2 4.306 4.816 114 14.9 1:20 (180, -2) Sept.13 0 2.98 55 58.7 4.278 4.854 119 15.0 0:37 (180, -1) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 15.1 mag (Aug. 26, Ken-ichi Kadota). It stays 15 mag for a while. It will be getting lower gradually after this, and it will be unobservable in January 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) Sept. 6 18 34.42 -12 49.8 4.898 5.399 114 15.0 19:32 (180, 68) Sept.13 18 32.62 -12 23.0 4.968 5.360 107 15.0 19:13 (174, 67) 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) Sept. 6 5 36.44 -69 51.1 14.685 14.771 92 15.0 4:48 (345, 52) Sept.13 5 38.89 -70 21.1 14.672 14.748 92 15.0 4:38 (348, 53) 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) Sept. 6 8 45.05 12 8.8 3.233 2.455 33 15.1 4:48 (251, 6) Sept.13 8 57.75 11 0.8 3.191 2.460 36 15.1 4:38 (251, 7) 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) Sept. 6 19 50.03 -39 57.8 0.646 1.485 126 15.6 20:46 ( 0, 85) Sept.13 19 25.21 -41 5.1 0.623 1.391 115 15.1 19:54 ( 0, 84) 217P/LINEAR Now it is 14.5 mag (Aug. 4, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in January. In the Northern Hemisphere, it will be getting higher gradually. 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) Sept. 6 7 40.30 15 13.6 2.247 1.764 49 15.5 4:48 (238, 16) Sept.13 7 54.45 14 51.6 2.246 1.820 52 15.7 4:38 (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) Sept. 6 18 20.49 -32 2.7 2.442 2.954 110 15.6 19:19 (180, 87) Sept.13 18 24.70 -31 52.6 2.535 2.959 105 15.7 19:13 (129, 85) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 15.5 mag (Sept. 1, Yoshiaki Yamaguchi). 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) Sept. 6 22 59.57 58 28.2 3.367 3.901 114 15.7 0:01 (180, -4) Sept.13 22 50.92 58 37.6 3.394 3.955 117 15.7 23:19 (180, -4) 47P/Ashbrook-Jackson Now it is 15.6 mag (Aug. 31, Michael Jager). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 23 2.77 -11 35.3 1.818 2.824 174 15.8 0:04 (180, 66) Sept.13 22 57.24 -11 31.0 1.823 2.820 169 15.8 23:26 (180, 66) C/2024 T5 ( ATLAS ) Now it is 16.1 mag (Aug. 30, Thomas Lehmann). 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) Sept. 6 3 24.30 -42 34.8 5.901 6.343 111 15.9 4:24 ( 0, 83) Sept.13 3 24.14 -43 14.1 5.822 6.301 114 15.8 3:56 ( 0, 82) 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) Sept. 6 10 26.41 7 35.4 2.701 1.709 8 15.9 4:48 (269,-12) Sept.13 10 44.27 5 44.1 2.711 1.728 9 15.9 4:38 (271,-11) 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, but it will appear in January. 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) Sept. 6 10 52.80 -70 41.0 2.364 2.356 77 16.1 4:48 (339, 28) Sept.13 11 38.99 -68 41.1 2.387 2.297 72 16.0 19:13 ( 23, 27) 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) Sept. 6 19 52.78 -12 23.3 2.178 2.967 133 16.4 20:50 (180, 67) Sept.13 19 51.15 -12 45.5 2.219 2.934 126 16.4 20:21 (180, 68) 302P/Lemmon-PanSTARRS It brightened very rapidly, and it became brighter than expected. Now it is 16.6 mag (Aug. 29, Thomas Lehmann). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 0 49.95 -2 32.0 2.464 3.387 151 16.4 1:51 (180, 57) Sept.13 0 46.76 -3 4.7 2.435 3.395 159 16.4 1:20 (180, 58) C/2022 R6 ( PanSTARRS ) Now it is 16.2 mag (May 13, ATLAS South Africa). It stays 16 mag for a while. It will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 8 27.52 -10 19.2 7.291 6.566 41 16.5 4:48 (267, 22) Sept.13 8 31.95 -10 27.8 7.238 6.567 45 16.5 4:38 (265, 25) 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 in January. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 8 21.71 26 54.0 4.630 3.945 42 16.5 4:48 (236, 1) Sept.13 8 27.21 27 50.7 4.554 3.956 48 16.5 4:38 (234, 2) C/2023 H5 ( Lemmon ) Now it is 16.5 mag (Aug. 30, 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) Sept. 6 12 43.06 63 3.7 4.771 4.349 59 16.5 19:08 (150,-27) Sept.13 12 58.68 63 4.4 4.743 4.357 61 16.5 19:13 (149,-29) 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) Sept. 6 3 21.70 -28 44.6 2.175 2.749 114 16.7 4:22 (180, 84) Sept.13 3 20.44 -32 26.8 2.193 2.809 117 16.8 3:53 (180, 87) 48P/Johnson Now it is 16.2 mag (Aug. 30, 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) Sept. 6 3 56.90 5 31.8 2.001 2.457 104 16.7 4:48 (183, 49) Sept.13 4 0.18 5 15.4 1.949 2.485 110 16.8 4:33 (180, 50) 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) Sept. 6 19 16.20 -73 3.1 7.900 8.233 105 16.8 20:15 ( 0, 52) Sept.13 19 8.17 -72 27.5 8.025 8.283 101 16.8 19:40 ( 0, 53) 261P/Larson Now it is 17.4 mag (Aug. 26, Ken-ichi Kadota). 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) Sept. 6 19 42.48 -17 27.3 1.397 2.194 130 16.9 20:40 (180, 72) Sept.13 19 43.52 -17 12.0 1.439 2.174 124 16.8 20:14 (180, 72) 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) Sept. 6 19 45.80 -15 47.8 4.260 4.991 131 16.9 20:43 (180, 71) Sept.13 19 45.42 -15 34.4 4.369 5.016 125 17.0 20:16 (180, 70) 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 16.4 mag (Aug. 30, 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) Sept. 6 17 56.27 20 16.7 4.740 5.032 101 16.9 19:08 (176, 35) Sept.13 17 54.78 19 14.3 4.900 5.105 96 17.1 19:13 (166, 35) 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 November. 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) Sept. 6 15 48.48 -12 6.1 6.727 6.530 74 16.9 19:08 (117, 51) Sept.13 15 48.95 -11 46.5 6.835 6.522 67 17.0 19:13 (110, 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) Sept. 6 1 6.02 -57 30.3 10.310 10.896 123 16.9 2:07 ( 0, 68) Sept.13 1 0.88 -57 39.6 10.328 10.908 122 16.9 1:34 ( 0, 67) 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) Sept. 6 14 24.94 -20 45.5 4.530 4.079 57 17.1 19:08 ( 90, 39) Sept.13 14 33.05 -20 49.9 4.643 4.110 52 17.2 19:13 ( 87, 34) C/2023 X2 ( Lemmon ) Now it is 17.4 mag (Aug. 19, Ken-ichi Kadota). 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) Sept. 6 7 2.58 70 1.3 5.355 5.161 73 17.2 4:48 (196,-21) Sept.13 7 16.73 71 24.0 5.275 5.153 77 17.2 4:38 (195,-22) 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) Sept. 6 2 39.86 -65 29.8 5.145 5.567 109 17.2 3:40 ( 0, 60) Sept.13 2 24.72 -66 41.8 5.168 5.591 109 17.2 2:57 ( 0, 58) C/2024 R4 ( PanSTARRS ) Brightening rapidly. It is expected to brighten up to 13 mag from 2027 to 2028. Now it is 17.2 mag (Aug. 30, 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) Sept. 6 22 3.17 24 8.9 6.614 7.475 146 17.2 23:00 (180, 31) Sept.13 21 58.15 24 3.0 6.587 7.435 145 17.2 22:27 (180, 31) C/2019 U5 ( PanSTARRS ) Now it is 16.7 mag (Aug. 4, Thomas Lehmann). It stays 18 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) Sept. 6 6 1.75 -40 53.8 8.180 8.111 82 17.3 4:48 (293, 63) Sept.13 6 1.06 -41 37.9 8.170 8.156 85 17.3 4:38 (295, 67) 195P/Hill Now it is 17.2 mag (Mar. 6, ATLAS South Africa). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will be observable soon. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 8 53.96 -12 59.3 5.212 4.443 36 17.3 4:48 (273, 19) Sept.13 9 0.84 -13 57.3 5.172 4.444 39 17.3 4:38 (273, 21) 493P/2024 Q2 ( LONEOS ) Now it is 17.4 mag (Aug. 14, Ken-ichi Kadota). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 4 55.47 44 23.5 3.841 3.902 85 17.4 4:48 (192, 9) Sept.13 5 1.22 45 17.7 3.742 3.894 91 17.3 4:38 (190, 9) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 16.8 mag (Aug. 19, Ken-ichi Kadota). 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) Sept. 6 6 18.72 27 43.8 9.784 9.473 69 17.3 4:48 (215, 18) Sept.13 6 19.55 27 55.0 9.719 9.523 75 17.3 4:38 (211, 20) 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) Sept. 6 22 40.18 -24 46.8 1.325 2.303 161 17.6 23:37 (180, 80) Sept.13 22 33.90 -24 43.5 1.313 2.270 155 17.4 23:03 (180, 80) 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) Sept. 6 23 15.49 44 10.6 5.811 6.494 129 17.5 0:17 (180, 11) Sept.13 23 11.02 43 42.7 5.834 6.554 132 17.5 23:40 (180, 11) 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) Sept. 6 8 31.25 22 39.8 2.613 1.935 38 17.6 4:48 (241, 2) Sept.13 8 47.64 22 21.3 2.597 1.968 42 17.6 4:38 (241, 2) 486P/2024 H1 ( Leonard ) Now it is 17.3 mag (Aug. 19, Ken-ichi Kadota). 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) Sept. 6 0 39.63 6 37.2 1.598 2.530 151 17.6 1:40 (180, 48) Sept.13 0 35.78 6 9.1 1.582 2.549 159 17.6 1:09 (180, 49) 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 soon. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 21 3.43 -49 50.6 2.276 3.029 130 17.6 22:00 ( 0, 75) Sept.13 20 52.32 -51 48.0 2.339 3.005 122 17.6 21:22 ( 0, 73) C/2024 N3 ( Sarneczky ) Now it is 17.6 mag (Aug. 14, 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) Sept. 6 16 27.06 52 47.4 5.218 5.141 80 17.6 19:08 (165, 0) Sept.13 16 29.51 50 45.0 5.259 5.153 78 17.6 19:13 (159, -1) 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) Sept. 6 16 50.22 9 31.3 5.086 5.131 86 17.6 19:08 (153, 42) Sept.13 16 53.58 8 38.9 5.157 5.115 81 17.7 19:13 (144, 39) 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). 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) Sept. 6 19 54.12 -9 22.4 1.817 2.622 134 17.7 20:52 (180, 64) Sept.13 19 55.07 -9 58.9 1.910 2.651 127 17.7 20:25 (180, 65) 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) Sept. 6 6 40.36 -17 58.0 8.254 7.935 68 17.7 4:48 (257, 48) Sept.13 6 41.49 -18 14.3 8.220 7.982 72 17.7 4:38 (254, 52) C/2025 J1 ( Borisov ) Now it is 17.8 mag (June 17, M. Jaeger, G. Rhemann, E. Prosperi). Brightening slowly. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 6 10 46.93 70 46.6 4.701 4.358 64 17.8 4:48 (204,-38) Sept.13 10 52.88 70 17.7 4.625 4.324 66 17.7 4:38 (204,-37) 24P/Schaumasse It will brighten up to 8 mag in winter, and will be observable in good condition. Now it is 19.8 mag (July 25, Artyom Novichonok). It will brighten rapidly after this. In the Northern Hemisphere, it stays observable in good condition. 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) Sept. 6 5 27.42 17 32.2 1.811 1.932 81 18.2 4:48 (208, 32) Sept.13 5 43.81 18 1.0 1.688 1.872 84 17.8 4:38 (208, 32) 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) Sept. 6 19 39.02 -23 5.6 3.334 4.049 129 17.8 20:37 (180, 78) Sept.13 19 38.56 -22 53.7 3.430 4.060 122 17.8 20:09 (180, 78) 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) Sept. 6 19 38.97 -14 26.8 2.501 3.247 130 17.8 20:37 (180, 69) Sept.13 19 39.04 -14 19.4 2.588 3.256 123 17.9 20:09 (180, 69) 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) Sept. 6 15 22.15 45 44.8 5.390 5.110 68 17.8 19:08 (152, 1) Sept.13 15 21.94 44 6.5 5.444 5.114 65 17.9 19:13 (146, -1) 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) Sept. 6 21 46.92 -21 43.2 1.989 2.943 157 17.9 22:44 (180, 77) Sept.13 21 42.27 -21 35.0 2.008 2.921 149 17.9 22:12 (180, 76) 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) Sept. 6 7 27.06 -6 27.4 4.645 4.139 54 17.9 4:48 (254, 32) Sept.13 7 33.43 -7 7.3 4.584 4.147 58 17.9 4:38 (252, 35) C/2023 RS61 ( PanSTARRS ) Although it is around 20 mag usually, now it is bright in outburst. Now it is 17.2 mag (Aug. 30, 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) Sept. 6 3 15.66 37 25.5 8.610 8.938 105 18.0 4:16 (180, 17) Sept.13 3 15.33 37 41.6 8.499 8.928 112 17.9 3:48 (180, 17)