Weekly Information about Bright Comets (2025 Aug. 16: South)

Japanese version Home page	Updated on August 20, 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. 16 7 34.46 29 49.2 2.492 1.738 33 11.9 5:14 (235, -3) Aug. 23 7 44.12 30 36.4 2.299 1.630 38 11.4 5:06 (233, -2) 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). Brightening rapidly. It will be getting lower gradually after this, and it will be unobservable in September in the Northern Hemisphere, or in October in the Southern Hemisphere. But it will be observable again in October in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 17 4.36 11 32.7 0.586 1.308 106 11.7 19:20 (180, 44) Aug. 23 16 0.52 3 37.7 0.648 1.177 87 11.5 18:59 (154, 49) 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. 16 15 55.76 43 32.5 2.690 2.758 83 13.6 18:54 (173, 11) Aug. 23 15 54.37 40 40.8 2.647 2.666 80 13.4 18:59 (166, 13) 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. 16 3 17.62 23 59.9 3.696 3.828 89 13.7 5:14 (187, 31) Aug. 23 3 22.54 24 28.5 3.604 3.830 95 13.6 5:06 (183, 30) 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. 16 3 37.19 -2 18.3 2.078 2.337 91 13.8 5:14 (201, 56) Aug. 23 3 45.49 -1 56.6 1.983 2.315 95 13.6 5:06 (196, 56) C/2021 G2 ( ATLAS ) Now it is 13.1 mag (July 30, Osamu Miyazaki). 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. 16 15 12.27 -0 36.0 5.652 5.620 83 14.0 18:54 (147, 51) Aug. 23 15 15.17 -0 37.4 5.779 5.644 77 14.1 18:59 (137, 47) 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. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 20 42.69 22 26.6 3.337 4.173 140 14.3 23:01 (180, 33) Aug. 23 20 29.34 21 6.0 3.321 4.142 139 14.3 22:21 (180, 34) 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. 16 10 26.77 5 54.0 7.270 6.291 13 14.3 18:54 ( 94, -5) Aug. 23 10 31.52 5 23.1 7.290 6.292 8 14.3 18:59 ( 89,-10) 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 getting lower gradually after this, and 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. 16 16 10.55 -16 13.1 2.654 3.010 100 14.9 18:54 (163, 70) Aug. 23 15 52.08 -15 29.2 2.611 2.791 89 14.5 18:59 (135, 64) 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. 16 6 51.86 16 0.5 2.222 1.602 40 14.8 5:14 (239, 14) Aug. 23 7 9.01 15 49.2 2.235 1.655 43 15.0 5:06 (239, 14) 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). It stays 15 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now, but it will appear in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 1 0.98 56 56.7 4.453 4.704 98 14.9 3:25 (180, -2) Aug. 23 0 47.85 57 4.6 4.396 4.741 103 14.9 2:44 (180, -2) 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 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. 16 8 15.34 18 35.6 6.411 5.480 21 14.9 5:14 (250, -4) Aug. 23 8 21.85 18 37.7 6.365 5.478 26 14.9 5:06 (248, -1) 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. 16 18 43.81 -14 15.9 4.733 5.517 136 15.0 21:04 (180, 69) Aug. 23 18 40.04 -13 46.3 4.779 5.477 129 15.0 20:33 (180, 69) 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. 16 5 26.28 -68 25.4 14.739 14.839 93 15.1 5:14 (339, 50) Aug. 23 5 30.08 -68 52.9 14.719 14.816 93 15.0 5:06 (341, 51) 43P/Wolf-Harrington Now it is 16.5 mag (Apr. 7, Alfons Diepvens). It stays 15 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in autumn. 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. 16 8 5.19 15 13.0 3.342 2.445 23 15.1 5:14 (251, 0) Aug. 23 8 18.74 14 15.2 3.309 2.447 26 15.1 5:06 (251, 2) 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. 16 18 14.89 -32 23.8 2.191 2.942 129 15.4 20:36 (180, 87) Aug. 23 18 15.51 -32 18.5 2.269 2.946 123 15.5 20:09 (180, 87) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 14.8 mag (July 29, Toshiyuki Takahashi). 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. 16 23 23.79 56 27.9 3.324 3.740 106 15.5 1:47 (180, -2) Aug. 23 23 16.40 57 23.2 3.332 3.793 109 15.5 1:13 (180, -2) 47P/Ashbrook-Jackson Now it is 15.7 mag (July 25, Masayoshi Yoshimi). 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. 16 23 17.96 -11 37.1 1.882 2.839 156 15.9 1:42 (180, 66) Aug. 23 23 13.43 -11 37.1 1.848 2.833 163 15.8 1:10 (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. 16 9 30.35 12 54.3 2.676 1.666 2 15.9 5:14 (265,-15) Aug. 23 9 49.45 11 11.6 2.684 1.678 4 15.9 5:06 (266,-14) 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. 16 3 20.86 -40 37.5 6.171 6.471 102 16.1 5:14 (316, 82) Aug. 23 3 22.62 -41 15.6 6.076 6.429 105 16.0 5:06 (341, 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. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 7 47.91 -72 20.9 2.360 2.539 88 16.4 5:14 (338, 38) Aug. 23 8 53.37 -72 44.6 2.348 2.477 85 16.3 5:06 (339, 35) 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. 16 3 16.87 -17 30.9 2.198 2.573 99 16.3 5:14 (200, 71) Aug. 23 3 19.82 -21 11.9 2.179 2.631 105 16.4 5:06 (188, 76) 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. 16 3 39.89 5 54.8 2.166 2.375 88 16.3 5:14 (198, 47) Aug. 23 3 46.67 5 52.0 2.111 2.402 93 16.5 5:06 (193, 48) 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 18 6.14 23 33.4 4.289 4.811 115 16.4 20:26 (180, 32) Aug. 23 18 1.89 22 27.4 4.432 4.886 110 16.6 19:54 (180, 33) 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). 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. 16 0 55.03 -1 12.3 2.619 3.366 130 16.5 3:18 (180, 56) Aug. 23 0 54.18 -1 34.8 2.558 3.373 137 16.5 2:50 (180, 56) 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. 16 12 1.08 63 10.5 4.830 4.330 55 16.5 18:54 (153,-22) Aug. 23 12 14.26 63 6.6 4.815 4.335 56 16.5 18:59 (152,-24) 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. 16 8 13.06 -10 3.8 7.398 6.566 32 16.5 5:14 (273, 14) Aug. 23 8 18.05 -10 6.9 7.371 6.566 34 16.5 5:06 (271, 17) 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. 16 20 59.79 -33 51.2 0.773 1.753 157 17.1 23:18 (180, 89) Aug. 23 20 38.73 -36 14.1 0.718 1.666 148 16.6 22:30 ( 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 16.2 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. 16 19 52.34 -74 22.5 7.561 8.080 117 16.6 22:13 ( 0, 51) Aug. 23 19 38.34 -74 2.2 7.667 8.131 114 16.7 21:32 ( 0, 51) 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. 16 20 3.90 -11 10.2 2.111 3.064 156 16.8 22:24 (180, 66) Aug. 23 19 59.30 -11 34.9 2.123 3.032 148 16.6 21:52 (180, 67) 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. 16 19 50.53 -16 27.5 3.993 4.918 153 16.7 22:11 (180, 71) Aug. 23 19 48.40 -16 14.3 4.071 4.942 145 16.7 21:41 (180, 71) 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. 16 14 1.87 -20 45.6 4.174 3.991 72 16.8 18:54 (103, 54) Aug. 23 14 9.32 -20 42.9 4.295 4.020 67 16.9 18:59 ( 98, 49) 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 15 49.97 -13 17.6 6.387 6.556 95 16.9 18:54 (153, 66) Aug. 23 15 48.95 -12 51.4 6.501 6.547 88 16.9 18:59 (137, 62) 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. 16 1 19.07 -56 41.5 10.309 10.861 120 16.9 3:42 ( 0, 68) Aug. 23 1 15.18 -57 0.6 10.301 10.873 122 16.9 3:11 ( 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. 16 19 48.89 -18 2.0 1.312 2.260 152 17.2 22:09 (180, 73) Aug. 23 19 45.27 -17 52.1 1.332 2.237 145 17.1 21:38 (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. 16 3 10.74 -61 7.9 5.136 5.498 105 17.1 5:14 (355, 64) Aug. 23 3 2.73 -62 39.7 5.129 5.521 107 17.1 4:57 ( 0, 62) 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. 16 6 0.90 -38 53.7 8.204 7.978 73 17.2 5:14 (290, 52) Aug. 23 6 1.63 -39 31.1 8.198 8.022 76 17.2 5:06 (291, 56) 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. 16 6 23.94 66 8.2 5.594 5.190 61 17.3 5:14 (200,-19) Aug. 23 6 36.28 67 23.3 5.515 5.180 65 17.3 5:06 (199,-19) 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. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 22 18.32 23 59.8 6.780 7.595 141 17.4 0:42 (180, 31) Aug. 23 22 13.35 24 7.6 6.711 7.555 144 17.3 0:10 (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. 16 6 14.29 27 12.2 9.942 9.323 49 17.3 5:14 (225, 11) Aug. 23 6 16.06 27 22.4 9.897 9.373 56 17.3 5:06 (221, 14) 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. 16 23 28.56 44 52.0 5.797 6.314 116 17.4 1:52 (180, 10) Aug. 23 23 24.39 44 45.5 5.793 6.374 121 17.4 1:20 (180, 10) 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. 16 19 44.77 -14 47.1 2.292 3.220 151 17.5 22:05 (180, 70) Aug. 23 19 41.87 -14 40.3 2.352 3.228 144 17.6 21:34 (180, 70) 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. 16 0 45.15 7 16.7 1.705 2.478 129 17.5 3:08 (180, 48) Aug. 23 0 44.47 7 11.9 1.661 2.495 136 17.5 2:40 (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. 16 16 25.04 59 2.9 5.120 5.108 83 17.6 18:54 (179, -4) Aug. 23 16 24.67 56 57.5 5.148 5.118 82 17.6 18:59 (174, -2) 493P/2024 Q2 ( LONEOS ) Now it is 17.3 mag (Aug. 6, ATLAS-MLO, Mauna Loa). Brightening slowly. 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. 16 4 34.62 41 43.3 4.140 3.929 70 17.6 5:14 (199, 10) Aug. 23 4 42.08 42 36.3 4.041 3.919 75 17.6 5:06 (197, 10) 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. 16 16 43.43 12 8.2 4.880 5.181 101 17.6 19:04 (180, 43) Aug. 23 16 45.12 11 16.5 4.946 5.164 96 17.6 18:59 (173, 44) 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. 16 21 37.95 -41 46.2 2.178 3.109 152 17.6 0:03 ( 0, 84) Aug. 23 21 26.80 -44 48.2 2.193 3.081 145 17.6 23:18 ( 0, 80) 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. 16 6 34.91 -17 19.3 8.320 7.793 55 17.6 5:14 (265, 38) Aug. 23 6 37.04 -17 30.1 8.304 7.840 59 17.7 5:06 (263, 41) 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. 16 19 45.32 -23 31.8 3.100 4.015 150 17.7 22:05 (180, 78) Aug. 23 19 42.44 -23 24.8 3.167 4.026 143 17.7 21:35 (180, 78) 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 stays observable in good condition. 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. 16 15 28.35 50 59.8 5.226 5.099 77 17.7 18:54 (170, 3) Aug. 23 15 25.19 49 12.4 5.280 5.102 74 17.8 18:59 (164, 3) 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. 16 19 58.39 -7 14.3 1.591 2.539 153 17.9 22:18 (180, 62) Aug. 23 19 55.79 -7 58.9 1.657 2.567 147 17.8 21:48 (180, 63) 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. 16 22 57.47 -23 57.3 1.431 2.406 159 18.1 1:21 (180, 79) Aug. 23 22 52.38 -24 21.2 1.384 2.371 163 17.9 0:49 (180, 79) C/2022 U1 ( Leonard ) Now it is 17.6 mag (July 15, Jean-Gabriel Bosch). Fading slowly. 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. 16 17 53.46 7 55.7 5.321 5.885 119 17.9 20:13 (180, 47) Aug. 23 17 49.43 6 53.0 5.450 5.922 113 18.0 19:42 (180, 48) C/2025 K4 ( Siverd ) Now it is 17.5 mag (June 19, J. L. Virlichie, P. Traverse, H. Roy). Fading slowly. 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. 16 16 30.40 -42 35.9 2.036 2.542 108 18.1 18:54 ( 3, 82) Aug. 23 16 40.24 -40 26.3 2.113 2.549 103 18.2 18:59 ( 40, 83) 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. 16 21 33.29 2 34.2 2.488 3.471 163 18.5 23:53 (180, 52) Aug. 23 21 29.06 1 51.4 2.506 3.488 163 18.5 23:21 (180, 53) 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. 16 14 58.02 -14 2.5 3.507 3.532 83 18.7 18:54 (128, 60) Aug. 23 15 4.61 -14 14.0 3.622 3.552 77 18.8 18:59 (120, 56) 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. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 16 5 46.40 43 22.0 0.973 0.963 57 22.3 5:14 (210, 2) Aug. 23 6 47.71 39 40.1 0.947 0.863 52 20.3 5:06 (218, 0)