Weekly Information about Bright Comets (2026 June 27: South)

Japanese version Home page	Updated on June 26, 2026
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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.

10P/Tempel 2 Now it is 9.3 mag (June 22, Virgilio Gonano). Fading slowly. In the Northern Hemisphere, it will be getting lower 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) June 27 20 56.93 -11 14.0 0.530 1.468 141 9.1 2:38 (180, 66) July 4 21 8.75 -13 1.8 0.492 1.451 145 8.7 2:22 (180, 68) 88P/Howell It brightened up to 9.6 mag in the very low sky in spring (Apr. 14, Chris Wyatt). Now it is 10.5 mag (June 22, Chris Wyatt). Fading gradually. 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) June 27 1 58.90 8 31.5 1.900 1.725 64 11.3 5:38 (219, 38) July 4 2 11.59 9 40.4 1.882 1.768 67 11.5 5:38 (215, 39) C/2025 R3 ( PanSTARRS ) It brightened up to 4.0 mag in late April (Apr. 30, Chris Wyatt). It brightened up to 1.3 mag due to the forward scattering in the SOHO LASCO images (Apr. 25, Mikolaj Kaszczyk). Now it is 11.5 mag (June 15, Andrew Pearce). Fading rapidly. In the Northern Hemisphere, it is not observable now, but it will appear in August. 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) June 27 7 3.95 -11 52.5 2.180 1.494 36 11.4 18:28 ( 82, 10) July 4 7 9.62 -12 22.2 2.320 1.607 35 11.9 18:30 ( 78, 5) 78P/Gehrels 2 Now it is 13.7 mag (June 21, Mike Olason). It stays 12 mag for a while. It locates somewhat low. But it will become high in summer in the Northern Hemisphere, or in autumn in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 3 54.91 19 14.5 2.759 2.005 34 12.2 5:38 (236, 12) July 4 4 11.96 19 47.3 2.722 2.006 37 12.2 5:38 (234, 13) 220P/McNaught Major outburst of about 9 mag occured from May 31 to June 1, and it brightened up to 8.3 mag (June 3, Marco Goiato). Now it is 11.8 mag (June 22, Chris Wyatt). Fading rapidly. 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) June 27 1 7.87 5 47.7 1.436 1.564 77 12.6 5:38 (206, 46) July 4 1 25.52 6 48.5 1.399 1.571 79 13.6 5:38 (202, 46) C/2023 R1 ( PanSTARRS ) Now it is 13.1 mag (June 22, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it will be getting lower gradually after this, and 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) June 27 17 0.09 -8 39.0 2.684 3.634 155 13.4 22:37 (180, 64) July 4 16 44.16 -9 24.2 2.753 3.646 146 13.5 21:54 (180, 65) C/2024 T5 ( ATLAS ) Now it is 13.9 mag (Mar. 12, ATLAS South Africa). Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear in August. In the Southern Hemisphere, it will be getting higher gradually. It is expected to brighten up to 11 mag in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 4 36.75 -14 31.6 5.348 4.695 45 13.5 5:38 (271, 25) July 4 4 43.56 -14 6.9 5.275 4.662 48 13.4 5:38 (267, 29) C/2024 J3 ( ATLAS ) Now it is 13.9 mag (June 12, Hiroshi Abe). It stays 14 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 19 56.87 36 22.2 3.532 4.084 116 13.6 1:38 (180, 19) July 4 19 49.07 38 2.8 3.494 4.065 117 13.6 1:03 (180, 17) P/2021 N1 ( ZTF ) First return of a new periodic comet which brightened up to 17 mag in 2021. It will approach to Earth down to 0.17 a.u. from June to July. It is expected to brighten up to 14 mag. Now it is 15.6 mag (June 24, Martin Masek). It will fade out rapidly after this. It will be fainter than 18 mag in October. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 0 12.57 -22 53.9 0.173 1.063 100 14.0 5:38 (196, 78) July 4 1 8.14 -5 7.4 0.177 1.026 88 13.9 5:38 (201, 59) 29P/Schwassmann-Wachmann 1 Now it is 13.8 mag (June 15, Toru Yusa). It will be unobservable in August in the Northern Hemisphere, or in September 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) June 27 11 7.81 -1 23.8 6.527 6.316 73 14.1 18:28 (139, 49) July 4 11 10.63 -1 38.1 6.631 6.317 67 14.1 18:30 (131, 45) 260P/McNaught It will brighten up to 13 mag and will be observable in good condition from summer to autumn. Now it is 15.4 mag (June 13, Ken-ichi Kadota). Brightening slowly. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 1 22.53 5 53.0 1.402 1.484 73 14.4 5:38 (210, 44) July 4 1 41.69 9 7.6 1.351 1.463 74 14.1 5:38 (206, 42) 63P/Wild 1 Now it is 14.4 mag (June 11, Toru Yusa). Fading slowly. It will be unobservable in July in the Northern Hemisphere, or in September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 9 40.01 18 11.5 2.536 1.977 46 14.6 18:28 (132, 21) July 4 9 54.77 16 1.2 2.580 1.975 43 14.6 18:30 (127, 20) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 14.9 mag (May 19, 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) June 27 6 12.25 -68 0.4 13.794 13.855 91 14.6 5:38 (334, 31) July 4 6 19.29 -68 3.5 13.776 13.834 91 14.6 5:38 (334, 33) C/2024 R4 ( PanSTARRS ) Now it is 15.2 mag (June 12, Ken-ichi Kadota). It stays 15 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) June 27 21 59.37 43 48.6 5.673 5.874 96 15.2 3:41 (180, 11) July 4 21 53.65 44 59.9 5.570 5.839 100 15.1 3:07 (180, 10) C/2022 QE78 ( ATLAS ) Now it is 15.5 mag (June 14, Alfons Diepvens). It stays 15 mag for a while. It will be unobservable in July in the Southern Hemisphere, or in August in the Northern Hemisphere. But it will be observable again in September in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 9 44.32 30 21.2 6.537 5.867 45 15.3 18:28 (141, 12) July 4 9 50.15 30 3.3 6.621 5.885 40 15.3 18:30 (136, 9) 235P/LINEAR It became brighter than expected. Now it is 14.5 mag (June 17, Andrew Pearce). It will fade out rapidly after this. It will be fainter than 18 mag in August. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 16 40.14 -8 4.8 1.492 2.433 151 15.4 22:18 (180, 63) July 4 16 37.42 -8 11.2 1.560 2.462 144 15.7 21:48 (180, 63) C/2021 G2 ( ATLAS ) Now it is 14.9 mag (June 11, Toru Yusa). 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) June 27 17 7.45 15 58.6 6.205 6.979 136 15.4 22:45 (180, 39) July 4 17 5.06 16 3.1 6.278 7.014 133 15.5 22:15 (180, 39) 123P/West-Hartley Now it is 17.6 mag (May 17, Kunihiro Shima). It stays 15 mag for a while. Now it is not observable. It will appear in September in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 7 36.03 31 57.8 3.202 2.261 18 15.5 18:28 (123, -9) July 4 7 53.14 31 21.3 3.204 2.246 16 15.5 18:30 (121,-11) 141P/Machholz 2 The condition is very bad in this apparition. It is not observable at all. Fading rapidly. It will be fainter than 18 mag in July. It will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 7 11.51 15 47.9 2.243 1.280 13 15.5 18:28 (106, -4) July 4 7 35.22 14 28.5 2.323 1.355 13 16.2 18:30 (104, -5) C/2022 N2 ( PanSTARRS ) Now it is 15.8 mag (May 7, Ken-ichi Kadota). It stays 16 mag for a while. Now it is not observable. It will appear in July in the Northern Hemisphere, or in August in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 5 56.79 27 0.2 5.777 4.769 6 15.6 5:38 (247,-15) July 4 6 5.03 26 58.4 5.798 4.804 11 15.6 5:38 (245,-11) 169P/NEAT It will approach to Earth down to 0.17 a.u. in August. It is expected to brighten up to 10 mag from August to September. Now it is 15.8 mag (June 17, Alfons Diepvens). Brightening rapidly. It will be getting lower gradually after this, and it will be unobservable in August. But it will be observable again in in the Northern Hemisphere, or in September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 19 27.02 8 22.8 0.576 1.522 144 16.1 1:09 (180, 47) July 4 19 17.57 11 37.7 0.483 1.439 144 15.6 0:32 (180, 43) C/2025 Y1 ( ATLAS ) Now it is 16.1 mag (June 14, Erik Bryssinck). It stays 16 mag for a while. It will be getting lower gradually after this, and it will be unobservable in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 12 41.20 4 24.1 5.164 5.309 92 16.3 18:28 (177, 51) July 4 12 42.75 4 11.0 5.219 5.256 86 16.3 18:30 (166, 50) C/2024 G6 ( ATLAS ) Now it is 16.9 mag (June 16, 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 be getting lower gradually after this, and it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 15 23.83 14 49.0 5.889 6.487 122 16.6 21:02 (180, 40) July 4 15 19.66 15 7.4 5.985 6.493 115 16.6 20:30 (180, 40) 24P/Schaumasse It brightened up to 8.4 mag in January (Jan. 14, Mitsunori Tsumura). Now it is 17.7 mag (June 14, Alfons Diepvens). Fading rapidly. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will be getting lower 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) June 27 14 19.54 -7 44.7 1.637 2.319 120 16.7 19:58 (180, 63) July 4 14 22.98 -8 49.7 1.768 2.378 114 17.1 19:34 (180, 64) C/2026 A2 ( Bok ) It will brighten up to 14 mag from autumn to winter. Now it is 16.9 mag (June 17, Jean-Gabriel Bosch). Brightening gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 17 30.82 78 14.7 2.898 2.867 78 16.9 23:04 (180,-23) July 4 17 10.52 78 50.8 2.854 2.810 77 16.8 22:17 (180,-24) C/2025 M2 ( PanSTARRS ) It is expected to brighten up to 12 mag from 2027 to 2028. Now it is 16.8 mag (June 13, ATLAS-HKO, Haleakala). 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) June 27 20 32.04 -18 7.6 4.715 5.612 149 16.9 2:14 (180, 73) July 4 20 24.34 -18 29.5 4.606 5.561 157 16.8 1:39 (180, 73) C/2022 R6 ( PanSTARRS ) Now it is 16.6 mag (June 15, Andrew Pearce). 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 will be unobservable in August. But it will be observable again in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 9 1.36 4 39.8 7.587 6.875 42 16.8 18:28 (114, 24) July 4 9 5.69 4 51.4 7.672 6.889 37 16.8 18:30 (110, 19) 65P/Gunn Now it is 18.3 mag (June 12, Kunihiro Shima). It stays 17 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) June 27 0 41.13 -5 24.9 3.303 3.418 87 16.9 5:38 (202, 59) July 4 0 45.26 -5 12.4 3.221 3.433 93 16.9 5:38 (190, 60) C/2023 RS61 ( PanSTARRS ) It is around 20 mag usually. However, it brightened in outburst in 2025 autumn up to 17.0 mag (Sept. 4, Taras Prystavski). Now it is 17.3 mag (Mar. 6, ATLAS-HKO, Haleakala). It stays 17 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 July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 4 3.30 38 42.2 9.388 8.555 33 17.0 5:38 (223, -3) July 4 4 7.70 39 0.7 9.324 8.546 38 16.9 5:38 (220, 0) C/2024 G4 ( PanSTARRS ) Now it is 17.1 mag (June 11, 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) June 27 20 19.81 3 47.5 4.132 4.959 140 17.0 2:01 (180, 51) July 4 20 17.97 3 26.6 4.091 4.967 146 17.0 1:32 (180, 51) C/2025 E1 ( PanSTARRS ) Now it is 17.2 mag (June 2, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 8 48.32 -62 41.2 3.927 4.070 90 17.1 18:28 ( 34, 44) July 4 8 54.81 -62 50.5 3.944 4.059 89 17.1 18:30 ( 34, 41) C/2025 Q3 ( ATLAS ) It brightened up to 14.1 mag in early 2026 (Jan. 16, Kunihiro Shima). Now it is 18.5 mag (June 13, John Drummond). It will fade out rapidly after this. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will never be observable after this. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 6 0.05 -42 47.6 2.771 2.540 66 17.3 5:38 (307, 23) July 4 6 20.26 -44 50.1 2.785 2.584 68 17.5 5:38 (309, 25) C/2019 E3 ( ATLAS ) Very far object. It stays 17 mag for a while. In the Northern Hemisphere, it will be unobservable temporarily in July. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 0 43.58 -42 59.4 11.234 11.487 101 17.4 5:38 (314, 78) July 4 0 43.08 -43 13.0 11.168 11.503 106 17.3 5:38 (337, 81) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 16.9 mag (June 13, ATLAS-MLO, Mauna Loa). It stays 18 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) June 27 23 6.44 32 9.2 6.461 6.581 92 17.3 4:48 (180, 23) July 4 23 3.08 32 15.4 6.401 6.625 98 17.4 4:17 (180, 23) C/2023 X2 ( Lemmon ) Now it is 17.0 mag (May 17, Kunihiro Shima). 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) June 27 13 20.61 78 31.0 5.531 5.271 70 17.4 18:59 (180,-23) July 4 13 25.11 76 46.5 5.551 5.285 69 17.4 18:36 (180,-22) 161P/Hartley-IRAS It is expected to brighten up 10 mag from autumn to winter, and it will be observable in good condition. Now it is 19.3 mag (June 25, Martin Masek). It will brighten rapidly after this. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 3 9.96 -22 23.1 2.571 2.337 65 17.8 5:38 (266, 46) July 4 3 13.82 -21 40.6 2.424 2.270 69 17.4 5:38 (262, 51) P/2012 K3 ( Gibbs ) It was observed at 17 mag in 2012. It was not recovered at the previous return in 2019. Fading slowly. It will be fainter than 18 mag in September. It stays observable in good condition. Actually, it is much fainter than this ephemeris (June 25, Pan-STARRS2, Haleakala). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 20 23.43 -13 0.9 1.167 2.106 149 17.6 2:05 (180, 68) July 4 20 22.06 -14 2.9 1.131 2.103 156 17.5 1:36 (180, 69) C/2025 A6 ( Lemmon ) It brightened up to 3.7 mag in late October (Oct. 26, Juan Jose Gonzalez). Now it is 16.7 mag (June 12, ATLAS-HKO, Haleakala). It will fade out rapidly after this. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 10 52.34 -33 34.6 3.595 3.664 85 17.6 18:28 ( 85, 66) July 4 10 55.45 -32 37.2 3.776 3.745 80 17.9 18:30 ( 84, 60) C/2023 H5 ( Lemmon ) Now it is 17.4 mag (June 10, 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 never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 22 3.12 67 26.0 5.292 5.221 80 17.8 3:44 (180,-13) July 4 21 56.38 67 35.5 5.274 5.253 83 17.8 3:10 (180,-13) C/2026 C1 ( Tsuchinshan ) It is expected to brighten up to 4 mag in 2028 autumn. Now it is 17.8 mag (June 16, M. Camarasa). It stays 18 mag for a while. It will be getting lower gradually after this, and it will be unobservable in August in the Northern Hemisphere, or in September in the Southern Hemisphere. But it will be observable again in October in the Northern Hemisphere. At the high light, it is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it becomes observable after the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 12 5.25 7 12.2 9.031 8.970 83 17.8 18:28 (164, 47) July 4 12 5.16 6 58.5 9.094 8.917 76 17.8 18:30 (154, 45) C/2023 F3 ( ATLAS ) Now it is 17.5 mag (May 17, Kunihiro Shima). It stays 18 mag for a while. In the Northern Hemisphere, it will never be observable after this. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 9 4.13 -4 21.9 7.050 6.419 48 17.8 18:28 (107, 30) July 4 9 5.87 -4 2.4 7.160 6.448 42 17.9 18:30 (103, 24) C/2026 AZ17 ( Bok ) Now it is 17.6 mag (June 16, Alfons Diepvens). It stays 18 mag for a while. In the Northern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) June 27 16 23.17 28 0.6 2.273 2.932 121 18.0 22:01 (180, 27) July 4 16 20.98 26 59.5 2.269 2.894 118 17.9 21:31 (180, 28)