Weekly Information about Bright Comets (2025 Sept. 13: South)

Japanese version Home page	Updated on September 17, 2025
Last week North Next week

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 R2 ( SWAN ) Bright new comet. Now it is 6.2 mag (Sept. 16, Mike Olason). It will turn to fade out rapidly after the peak. In the Northern Hemisphere, it is not observable now, but it will appear in October. 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.13 13 10.79 -9 33.7 0.918 0.504 29 6.8 19:13 ( 86, 12) Sept.20 13 42.47 -12 3.2 0.740 0.534 31 6.6 19:19 ( 84, 13) C/2025 A6 ( Lemmon ) It brightened very rapidly. It is expected to brighten up to 4 mag from October to November. Now it is 8.5 mag (Sept. 16, 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 getting lower gradually after this, and 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.13 8 23.41 34 11.0 1.651 1.294 51 9.2 4:38 (228, -2) Sept.20 8 43.92 36 2.0 1.417 1.179 55 8.5 4:28 (227, -3) C/2025 K1 ( ATLAS ) It is expected to brighten up to 7.5 mag in October. Now it is 11.4 mag (Sept. 6, 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.13 14 11.58 -10 48.0 1.004 0.758 44 10.5 19:13 ( 93, 24) Sept.20 13 47.25 -13 2.4 1.128 0.611 32 9.8 19:19 ( 83, 14) 414P/STEREO It brightened very rapidly. Now it is 14.7 mag (Sept. 1, Masayoshi Yoshimi). 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.13 9 19.38 18 27.5 1.044 0.595 33 13.4 4:38 (248, -1) Sept.20 10 0.12 10 24.2 1.134 0.541 28 12.4 4:28 (258, -1) C/2024 E1 ( Wierzchos ) It is expected to brighten up to 5 mag in January. Now it is 13.5 mag (Sept. 14, Juan Jose Gonzalez). 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.13 15 58.90 31 26.6 2.532 2.382 69 12.8 19:13 (145, 13) Sept.20 16 2.89 28 13.3 2.497 2.285 66 12.6 19:19 (138, 12) 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 13.9 mag (Sept. 10, Taras Prystavski). 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.13 15 2.13 -13 4.0 2.546 2.166 56 13.4 19:13 ( 99, 36) Sept.20 14 47.34 -12 13.9 2.531 1.976 46 13.0 19:19 ( 93, 25) 240P/NEAT Now it is brighter than originally expected. Now it is 13.4 mag (Sept. 7, Ken-ichi Kadota). 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.13 4 5.60 -1 2.8 1.711 2.256 109 13.2 4:38 (180, 56) Sept.20 4 10.27 -0 46.0 1.625 2.239 114 13.1 4:15 (180, 56) 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.13 3 33.04 25 38.4 3.340 3.844 112 13.5 4:06 (180, 29) Sept.20 3 34.97 25 55.9 3.261 3.851 119 13.4 3:40 (180, 29) C/2023 R1 ( PanSTARRS ) It is expected to brighten up to 13 mag in early summer in 2026. Now it is 14.8 mag (Sept. 11, G. Nobre). 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.13 19 54.17 16 8.8 3.396 4.051 124 14.2 20:23 (180, 39) Sept.20 19 44.78 14 21.7 3.456 4.022 117 14.2 19:47 (180, 41) C/2021 G2 ( ATLAS ) Now it is 14.6 mag (Sept. 7, Ken-ichi Kadota). It stays 15 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) Sept.13 15 26.15 -0 49.6 6.143 5.719 60 14.3 19:13 (116, 33) Sept.20 15 30.46 -0 54.9 6.254 5.745 55 14.3 19:19 (110, 28) 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.13 10 45.78 3 46.5 7.285 6.294 9 14.3 4:38 (273,-10) Sept.20 10 50.46 3 13.5 7.261 6.295 14 14.3 4:28 (271, -7) 210P/Christensen It is expected to brighten up to 8 mag from late autumn to early winter. Now it is 17.4 mag (Sept. 1, Andrew Pearce). 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.13 19 25.21 -41 5.1 0.623 1.391 115 15.1 19:54 ( 0, 84) Sept.20 19 1.82 -41 43.3 0.604 1.294 104 14.6 19:19 ( 23, 83) 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 locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.13 8 40.49 18 44.4 6.176 5.476 42 14.8 4:38 (242, 6) Sept.20 8 46.31 18 47.8 6.097 5.476 48 14.8 4:28 (241, 8) 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.13 0 2.98 55 58.7 4.278 4.854 119 15.0 0:37 (180, -1) Sept.20 23 47.79 55 2.8 4.263 4.892 123 15.0 23:48 (180, 0) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 14.7 mag (Aug. 28, Andrew Pearce). 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.13 18 32.62 -12 23.0 4.968 5.360 107 15.0 19:13 (174, 67) Sept.20 18 31.50 -11 56.9 5.042 5.321 100 15.0 19:19 (154, 65) 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 (Aug. 31, 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) Sept.13 5 38.89 -70 21.1 14.672 14.748 92 15.0 4:38 (348, 53) Sept.20 5 40.80 -70 51.3 14.660 14.726 91 15.0 4:28 (350, 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.13 8 57.75 11 0.8 3.191 2.460 36 15.1 4:38 (251, 7) Sept.20 9 10.13 9 50.2 3.145 2.467 40 15.0 4:28 (251, 9) 217P/LINEAR It brightened up to 12.1 mag in early summer (June 10, Taras Prystavski). Now it is 14.8 mag (Aug. 23, Hiroshi Abe). Fading gradually. It will be fainter than 18 mag in January. In the Northern Hemisphere, it stays observable in good condition. 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.13 7 54.45 14 51.6 2.246 1.820 52 15.7 4:38 (238, 16) Sept.20 8 7.60 14 28.1 2.240 1.877 56 15.9 4:28 (237, 17) 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.13 22 50.92 58 37.6 3.394 3.955 117 15.7 23:19 (180, -4) Sept.20 22 42.65 58 32.4 3.427 4.009 118 15.8 22:44 (180, -4) 65P/Gunn Now it is 15.7 mag (Aug. 25, Thomas Lehmann). Fading slowly. It will be unobservable in January. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.13 18 24.70 -31 52.6 2.535 2.959 105 15.7 19:13 (129, 85) Sept.20 18 29.94 -31 41.2 2.630 2.965 99 15.8 19:19 (106, 80) C/2024 T5 ( ATLAS ) Now it is 15.6 mag (Sept. 7, ATLAS-MLO, Mauna Loa). It stays 15 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.13 3 24.14 -43 14.1 5.822 6.301 114 15.8 3:56 ( 0, 82) Sept.20 3 23.29 -43 52.1 5.749 6.259 116 15.8 3:28 ( 0, 81) 47P/Ashbrook-Jackson Now it is 15.5 mag (Sept. 3, 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.13 22 57.24 -11 31.0 1.823 2.820 169 15.8 23:26 (180, 66) Sept.20 22 51.97 -11 23.1 1.841 2.816 162 15.8 22:54 (180, 66) 88P/Howell Now it is 17.7 mag (July 24, Thomas Lehmann). It will brighten rapidly after this. Now it is not observable. It will appear in January 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.13 12 31.11 -1 6.9 3.229 2.290 17 16.1 19:13 ( 87, -1) Sept.20 12 43.20 -2 31.2 3.204 2.244 14 15.9 19:19 ( 83, -5) 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.13 11 38.99 -68 41.1 2.387 2.297 72 16.0 19:13 ( 23, 27) Sept.20 12 16.43 -66 23.5 2.417 2.240 67 15.9 19:19 ( 26, 26) 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.13 10 44.27 5 44.1 2.711 1.728 9 15.9 4:38 (271,-11) Sept.20 11 1.73 3 51.9 2.720 1.750 12 16.0 4:28 (272,-10) 78P/Gehrels 2 It will brighten up to 12 mag in 2026 summer. Now it is 16.3 mag (Sept. 1, Ken-ichi Kadota). Brightening slowly. 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 January. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.13 19 51.15 -12 45.5 2.219 2.934 126 16.4 20:21 (180, 68) Sept.20 19 50.71 -13 5.4 2.267 2.902 119 16.3 19:53 (180, 68) C/2024 A1 ( ATLAS ) Now it is 16.7 mag (Sept. 1, Ken-ichi Kadota). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. 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.13 8 27.21 27 50.7 4.554 3.956 48 16.5 4:38 (234, 2) Sept.20 8 32.45 28 51.6 4.471 3.969 54 16.4 4:28 (231, 3) 302P/Lemmon-PanSTARRS It brightened very rapidly, and it became brighter than expected. Now it is 16.0 mag (Sept. 1, Andrew Pearce). Fading slowly. It will be fainter than 18 mag in January. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.13 0 46.76 -3 4.7 2.435 3.395 159 16.4 1:20 (180, 58) Sept.20 0 43.04 -3 38.4 2.419 3.402 166 16.5 0:49 (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.13 8 31.95 -10 27.8 7.238 6.567 45 16.5 4:38 (265, 25) Sept.20 8 36.14 -10 37.6 7.178 6.568 49 16.5 4:28 (263, 28) C/2023 H5 ( Lemmon ) Now it is 16.0 mag (Sept. 12, 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) Sept.13 12 58.68 63 4.4 4.743 4.357 61 16.5 19:13 (149,-29) Sept.20 13 15.14 63 6.3 4.712 4.365 63 16.5 19:19 (148,-31) 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.13 19 43.52 -17 12.0 1.439 2.174 124 16.8 20:14 (180, 72) Sept.20 19 46.18 -16 54.6 1.488 2.155 118 16.7 19:49 (180, 72) 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.13 4 0.18 5 15.4 1.949 2.485 110 16.8 4:33 (180, 50) Sept.20 4 2.13 4 55.6 1.900 2.513 116 16.9 4:07 (180, 50) C/2024 J2 ( Wierzchos ) It brightened rapidly up to 14.6 mag in winter (Jan. 31, Thomas Lehmann). Now it is 16.8 mag (Sept. 4, ATLAS-HKO, Haleakala). 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.13 3 20.44 -32 26.8 2.193 2.809 117 16.8 3:53 (180, 87) Sept.20 3 17.61 -35 59.5 2.225 2.869 120 17.0 3:23 ( 0, 89) 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 16.4 mag (Aug. 29, ATLAS Chile). 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.13 19 8.17 -72 27.5 8.025 8.283 101 16.8 19:40 ( 0, 53) Sept.20 19 2.05 -71 49.6 8.155 8.334 96 16.9 19:19 ( 2, 53) 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.13 1 0.88 -57 39.6 10.328 10.908 122 16.9 1:34 ( 0, 67) Sept.20 0 55.49 -57 44.6 10.356 10.920 121 17.0 1:01 ( 0, 67) C/2023 H1 ( PanSTARRS ) Now it is 16.9 mag (Aug. 29, ATLAS South Africa). 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.13 19 45.42 -15 34.4 4.369 5.016 125 17.0 20:16 (180, 70) Sept.20 19 45.67 -15 20.8 4.485 5.042 118 17.0 19:48 (180, 70) C/2024 G6 ( ATLAS ) Now it is 17.1 mag (Aug. 21, Yasukazu Ikari). It stays 17 mag for a while. It will be unobservable in November. But it will be observable again in January 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.13 15 48.95 -11 46.5 6.835 6.522 67 17.0 19:13 (110, 44) Sept.20 15 49.84 -11 28.6 6.938 6.514 61 17.0 19:19 (104, 38) 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 17.0 mag (Sept. 7, Ken-ichi Kadota). 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.13 17 54.78 19 14.3 4.900 5.105 96 17.1 19:13 (166, 35) Sept.20 17 54.07 18 14.7 5.064 5.177 90 17.2 19:19 (156, 33) 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.13 7 16.73 71 24.0 5.275 5.153 77 17.2 4:38 (195,-22) Sept.20 7 31.74 72 49.0 5.197 5.145 81 17.1 4:28 (194,-23) 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 (Sept. 1, 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 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.13 21 58.15 24 3.0 6.587 7.435 145 17.2 22:27 (180, 31) Sept.20 21 53.31 23 53.1 6.574 7.395 142 17.1 21:55 (180, 31) 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.13 14 33.05 -20 49.9 4.643 4.110 52 17.2 19:13 ( 87, 34) Sept.20 14 41.33 -20 55.7 4.751 4.141 47 17.3 19:19 ( 84, 29) C/2023 U1 ( Fuls ) It continues brightening even after the perihelion passage. Now it is 17.1 mag (Sept. 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.13 2 24.72 -66 41.8 5.168 5.591 109 17.2 2:57 ( 0, 58) Sept.20 2 7.18 -67 40.9 5.201 5.615 109 17.2 2:13 ( 0, 57) 493P/2024 Q2 ( LONEOS ) Now it is 17.5 mag (Sept. 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) Sept.13 5 1.22 45 17.7 3.742 3.894 91 17.3 4:38 (190, 9) Sept.20 5 6.22 46 12.4 3.643 3.886 96 17.2 4:28 (188, 8) 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 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) Sept.13 9 0.84 -13 57.3 5.172 4.444 39 17.3 4:38 (273, 21) Sept.20 9 7.52 -14 58.1 5.127 4.445 43 17.3 4:28 (272, 24) C/2019 U5 ( PanSTARRS ) Now it is 17.1 mag (Sept. 2, Andrew Pearce). 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.13 6 1.06 -41 37.9 8.170 8.156 85 17.3 4:38 (295, 67) Sept.20 5 59.82 -42 23.1 8.160 8.200 88 17.3 4:28 (299, 70) 145P/Shoemaker-Levy 5 Now it is 17.3 mag (Sept. 2, Francois Kugel). 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.13 22 33.90 -24 43.5 1.313 2.270 155 17.4 23:03 (180, 80) Sept.20 22 28.10 -24 27.6 1.313 2.238 149 17.3 22:30 (180, 79) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 16.9 mag (Sept. 5, Alfons Diepvens). 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.13 6 19.55 27 55.0 9.719 9.523 75 17.3 4:38 (211, 20) Sept.20 6 20.04 28 6.7 9.651 9.573 82 17.3 4:28 (208, 21) 24P/Schaumasse It will brighten up to 8 mag in winter, and will be observable in good condition. Now it is 19.7 mag (Aug. 26, Alan Hale). 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.13 5 43.81 18 1.0 1.688 1.872 84 17.8 4:38 (208, 32) Sept.20 6 0.99 18 27.5 1.568 1.813 86 17.4 4:28 (207, 32) 21P/Giacobini-Zinner It brightened up to 11 mag in the SWAN images in early spring (Jan. 27, Vladimir Bezugly). Fading slowly. It will be fainter than 18 mag in October. It locates somewhat low in the Northern Hemisphere. 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.13 8 51.99 -6 45.9 3.009 2.320 39 17.4 4:38 (265, 19) Sept.20 9 2.18 -7 55.9 3.022 2.381 42 17.6 4:28 (265, 21) 164P/Christensen Now it is 17.3 mag (Sept. 15, Catalina Sky Survey). 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.13 8 47.64 22 21.3 2.597 1.968 42 17.6 4:38 (241, 2) Sept.20 9 3.44 22 0.4 2.577 2.002 45 17.5 4:28 (241, 3) C/2025 R1 ( ATLAS ) Now it is 17.0 mag (Sept. 9, B. Kumar). 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) Sept.13 4 40.12 70 10.5 1.900 2.150 89 17.7 4:38 (183,-15) Sept.20 4 22.61 76 22.3 1.800 2.118 93 17.5 4:28 (180,-21) 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 17.9 mag (Aug. 23, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in November. 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.13 23 11.02 43 42.7 5.834 6.554 132 17.5 23:40 (180, 11) Sept.20 23 6.72 43 8.1 5.868 6.613 134 17.6 23:08 (180, 12) C/2025 J1 ( Borisov ) Now it is 17.7 mag (Aug. 30, J. Linder). 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.13 10 52.88 70 17.7 4.625 4.324 66 17.7 4:38 (204,-37) Sept.20 10 58.53 69 56.8 4.543 4.290 69 17.6 4:28 (205,-36) 486P/2024 H1 ( Leonard ) Now it is 17.3 mag (Aug. 31, Michael Jager). 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.13 0 35.78 6 9.1 1.582 2.549 159 17.6 1:09 (180, 49) Sept.20 0 31.27 5 35.4 1.578 2.568 167 17.7 0:37 (180, 49) C/2025 L2 ( MAPS ) Now it is 17.8 mag (Sept. 9, A. Sankovich). 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.13 20 52.32 -51 48.0 2.339 3.005 122 17.6 21:22 ( 0, 73) Sept.20 20 42.32 -53 23.9 2.412 2.982 115 17.7 20:45 ( 0, 72) C/2024 N3 ( Sarneczky ) Now it is 17.5 mag (Aug. 25, Erik Bryssinck). 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) Sept.13 16 29.51 50 45.0 5.259 5.153 78 17.6 19:13 (159, -1) Sept.20 16 32.61 48 45.6 5.304 5.165 76 17.7 19:19 (154, -1) C/2024 G4 ( PanSTARRS ) Now it is 17.8 mag (Aug. 23, 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. But it will be observable again in January in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.13 16 53.58 8 38.9 5.157 5.115 81 17.7 19:13 (144, 39) Sept.20 16 57.46 7 47.4 5.229 5.100 77 17.7 19:19 (136, 36) 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 18.7 mag (Aug. 29, ATLAS South Africa). 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.13 19 55.07 -9 58.9 1.910 2.651 127 17.7 20:25 (180, 65) Sept.20 19 57.17 -10 31.1 2.011 2.679 121 17.7 20:00 (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 Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.13 6 41.49 -18 14.3 8.220 7.982 72 17.7 4:38 (254, 52) Sept.20 6 42.24 -18 31.8 8.183 8.029 77 17.7 4:28 (251, 55) 491P/2024 K2 ( Spacewatch-PanSTARRS ) Now it is 17.8 mag (Aug. 27, ATLAS Chile). 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.13 19 38.56 -22 53.7 3.430 4.060 122 17.8 20:09 (180, 78) Sept.20 19 38.95 -22 40.4 3.534 4.072 115 17.9 19:42 (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 never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.13 15 21.94 44 6.5 5.444 5.114 65 17.9 19:13 (146, -1) Sept.20 15 22.44 42 32.7 5.496 5.120 63 17.9 19:19 (141, -4) 188P/LINEAR-Mueller Now it is 18.4 mag (Sept. 1, Ken-ichi Kadota). 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.13 21 42.27 -21 35.0 2.008 2.921 149 17.9 22:12 (180, 76) Sept.20 21 38.45 -21 20.4 2.038 2.900 142 17.9 21:41 (180, 76) C/2023 RS61 ( PanSTARRS ) Although it is around 20 mag usually, now it is bright in outburst. Now it is 17.2 mag (Sept. 15, ATLAS-MLO, Mauna Loa). 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.13 3 15.33 37 41.6 8.499 8.928 112 17.9 3:48 (180, 17) Sept.20 3 14.57 37 55.9 8.394 8.918 118 17.9 3:20 (180, 17) 351P/Wiegert-PanSTARRS Now it is brighter than expected. Now it is 17.4 mag (Aug. 31, ATLAS South Africa). 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.13 19 39.04 -14 19.4 2.588 3.256 123 17.9 20:09 (180, 69) Sept.20 19 40.12 -14 11.3 2.682 3.266 117 18.0 19:43 (180, 69) 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.13 7 33.43 -7 7.3 4.584 4.147 58 17.9 4:38 (252, 35) Sept.20 7 39.39 -7 49.5 4.518 4.156 62 17.9 4:28 (251, 38) 276P/Vorobjov Now it is 17.9 mag (Mar. 6, Erik Bryssinck). 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.13 6 47.35 11 12.3 4.345 4.089 68 18.0 4:38 (227, 30) Sept.20 6 52.54 10 41.9 4.258 4.098 74 17.9 4:28 (225, 32)