Weekly Information about Bright Comets (2026 July 4: South)

Japanese version Home page	Updated on July 5, 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 9.0 mag (June 26, Virgilio Gonano). Fading gradually. 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) July 4 21 8.75 -13 1.8 0.492 1.451 145 8.7 2:22 (180, 68) July 11 21 20.08 -15 17.9 0.461 1.437 150 8.4 2:06 (180, 70) 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) July 4 2 11.59 9 40.4 1.882 1.768 67 11.5 5:38 (215, 39) July 11 2 23.41 10 42.2 1.861 1.812 71 11.7 5:37 (210, 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 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) July 4 7 9.62 -12 22.2 2.320 1.607 35 11.9 18:30 ( 78, 5) July 11 7 14.78 -12 56.8 2.446 1.717 35 12.3 5:37 (284, 3) 78P/Gehrels 2 Now it is 13.1 mag (June 29, Mike Olason). It stays 12 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 autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 4 4 11.96 19 47.3 2.722 2.006 37 12.2 5:38 (234, 13) July 11 4 28.96 20 12.8 2.683 2.009 39 12.2 5:37 (232, 14) 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 be observable soon. In the Southern Hemisphere, it stays observable in good condition. 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) July 4 4 43.56 -14 6.9 5.275 4.662 48 13.4 5:38 (267, 29) July 11 4 50.25 -13 45.9 5.196 4.629 51 13.4 5:37 (264, 33) C/2023 R1 ( PanSTARRS ) Now it is 12.8 mag (June 27, Toru Yusa). 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) July 4 16 44.16 -9 24.2 2.753 3.646 146 13.5 21:54 (180, 65) July 11 16 29.59 -10 8.7 2.844 3.660 137 13.6 21:12 (180, 65) C/2024 J3 ( ATLAS ) Now it is 13.7 mag (June 28, Toru Yusa). 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) July 4 19 49.07 38 2.8 3.494 4.065 117 13.6 1:03 (180, 17) July 11 19 40.49 39 31.5 3.467 4.047 118 13.6 0:27 (180, 15) 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 12.0 mag (June 29, Ken-ichi Kadota). 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) July 4 1 25.52 6 48.5 1.399 1.571 79 13.6 5:38 (202, 46) July 11 1 42.60 7 40.6 1.364 1.581 81 14.6 5:37 (198, 46) 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). 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 4 1 41.69 9 7.6 1.351 1.463 74 14.1 5:38 (206, 42) July 11 2 1.14 12 24.1 1.305 1.445 75 13.9 5:37 (202, 40) 29P/Schwassmann-Wachmann 1 Now it is 14.8 mag (June 27, Toru Yusa). It will be unobservable soon 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) July 4 11 10.63 -1 38.1 6.631 6.317 67 14.1 18:30 (131, 45) July 11 11 13.76 -1 54.9 6.731 6.317 61 14.1 18:33 (124, 41) 63P/Wild 1 Now it is 14.4 mag (June 11, Toru Yusa). Fading slowly. It will be unobservable soon 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) July 4 9 54.77 16 1.2 2.580 1.975 43 14.6 18:30 (127, 20) July 11 10 9.45 13 48.5 2.625 1.975 41 14.6 18:33 (123, 19) 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) July 4 6 19.29 -68 3.5 13.776 13.834 91 14.6 5:38 (334, 33) July 11 6 26.32 -68 9.0 13.761 13.813 90 14.6 5:37 (333, 35) C/2024 R4 ( PanSTARRS ) Now it is 14.4 mag (June 18, Kunihiro Shima). 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) July 4 21 53.65 44 59.9 5.570 5.839 100 15.1 3:07 (180, 10) July 11 21 46.93 46 6.2 5.474 5.804 103 15.0 2:33 (180, 9) 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) July 4 19 17.57 11 37.7 0.483 1.439 144 15.6 0:32 (180, 43) July 11 19 2.96 15 32.7 0.399 1.354 142 15.2 23:44 (180, 39) 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 soon 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) July 4 9 50.15 30 3.3 6.621 5.885 40 15.3 18:30 (136, 9) July 11 9 56.16 29 44.8 6.698 5.904 35 15.3 18:33 (132, 5) P/2026 M1 ( 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 was expected to brighten up to 14 mag. But actually, it is fainter than originally expected. 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 September. 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) July 4 1 6.56 -6 27.8 0.170 1.028 88 15.3 5:38 (201, 60) July 11 1 51.50 9 31.0 0.194 0.998 79 15.4 5:37 (200, 43) 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) July 4 7 53.14 31 21.3 3.204 2.246 16 15.5 18:30 (121,-11) July 11 8 10.27 30 38.0 3.204 2.232 14 15.4 18:33 (118,-13) C/2021 G2 ( ATLAS ) Now it is 15.1 mag (June 28, 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) July 4 17 5.06 16 3.1 6.278 7.014 133 15.5 22:15 (180, 39) July 11 17 2.93 16 2.8 6.362 7.048 129 15.5 21:46 (180, 39) 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 soon 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) July 4 6 5.03 26 58.4 5.798 4.804 11 15.6 5:38 (245,-11) July 11 6 13.12 26 55.3 5.810 4.840 15 15.7 5:37 (243, -8) 235P/LINEAR It became brighter than expected. Now it is 14.6 mag (June 27, Toru Yusa). It will fade out rapidly after this. 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) July 4 16 37.42 -8 11.2 1.560 2.462 144 15.7 21:48 (180, 63) July 11 16 35.87 -8 24.5 1.637 2.490 138 15.9 21:19 (180, 63) 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 in the Northern Hemisphere, or in October in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 4 12 42.75 4 11.0 5.219 5.256 86 16.3 18:30 (166, 50) July 11 12 44.83 3 54.7 5.274 5.204 80 16.3 18:33 (155, 48) 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) July 4 15 19.66 15 7.4 5.985 6.493 115 16.6 20:30 (180, 40) July 11 15 16.01 15 20.8 6.089 6.500 109 16.7 19:59 (180, 40) C/2026 A2 ( Bok ) It will brighten up to 14 mag from autumn to winter. Now it is 16.2 mag (June 27, Toru Yusa). 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) July 4 17 10.52 78 50.8 2.854 2.810 77 16.8 22:17 (180,-24) July 11 16 50.09 79 8.2 2.806 2.754 76 16.6 21:29 (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 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) July 4 20 24.34 -18 29.5 4.606 5.561 157 16.8 1:39 (180, 73) July 11 20 16.00 -18 52.2 4.516 5.509 166 16.7 1:03 (180, 74) 65P/Gunn Now it is 18.3 mag (June 12, Kunihiro Shima). 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) July 4 0 45.26 -5 12.4 3.221 3.433 93 16.9 5:38 (190, 60) July 11 0 48.68 -5 4.9 3.138 3.448 99 16.9 5:34 (180, 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. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 4 4 7.70 39 0.7 9.324 8.546 38 16.9 5:38 (220, 0) July 11 4 11.95 39 19.6 9.251 8.538 43 16.9 5:37 (217, 2) 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) July 4 20 17.97 3 26.6 4.091 4.967 146 17.0 1:32 (180, 51) July 11 20 15.84 3 0.2 4.060 4.976 151 17.0 1:02 (180, 52) 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 soon. 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) July 4 14 22.98 -8 49.7 1.768 2.378 114 17.1 19:34 (180, 64) July 11 14 27.29 -9 53.1 1.903 2.436 109 17.4 19:11 (180, 65) 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 be observable 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) July 4 3 13.82 -21 40.6 2.424 2.270 69 17.4 5:38 (262, 51) July 11 3 17.12 -21 2.9 2.271 2.204 73 17.1 5:37 (256, 55) 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) July 4 8 54.81 -62 50.5 3.944 4.059 89 17.1 18:30 ( 34, 41) July 11 9 2.18 -63 8.9 3.961 4.049 87 17.1 18:33 ( 33, 39) C/2019 E3 ( ATLAS ) Very far object. It stays 17 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 4 0 43.08 -43 13.0 11.168 11.503 106 17.3 5:38 (337, 81) July 11 0 42.22 -43 27.9 11.105 11.519 111 17.3 5:28 ( 0, 82) 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) July 4 23 3.08 32 15.4 6.401 6.625 98 17.4 4:17 (180, 23) July 11 22 59.15 32 17.2 6.344 6.669 104 17.4 3:45 (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) July 4 13 25.11 76 46.5 5.551 5.285 69 17.4 18:36 (180,-22) July 11 13 30.56 75 0.5 5.572 5.299 69 17.4 18:33 (179,-20) 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) July 4 20 22.06 -14 2.9 1.131 2.103 156 17.5 1:36 (180, 69) July 11 20 19.64 -15 14.9 1.105 2.102 164 17.4 1:06 (180, 70) 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 soon. 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) July 4 6 20.26 -44 50.1 2.785 2.584 68 17.5 5:38 (309, 25) July 11 6 41.49 -46 51.9 2.806 2.630 69 17.7 5:37 (310, 26) 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) July 4 21 56.38 67 35.5 5.274 5.253 83 17.8 3:10 (180,-13) July 11 21 48.47 67 37.2 5.255 5.284 86 17.8 2:34 (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 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) July 4 12 5.16 6 58.5 9.094 8.917 76 17.8 18:30 (154, 45) July 11 12 5.39 6 43.0 9.154 8.864 70 17.8 18:33 (144, 42) 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) July 4 16 20.98 26 59.5 2.269 2.894 118 17.9 21:31 (180, 28) July 11 16 19.67 25 44.6 2.272 2.857 115 17.8 21:03 (180, 29) 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. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 4 10 55.45 -32 37.2 3.776 3.745 80 17.9 18:30 ( 84, 60) July 11 10 58.97 -31 51.5 3.955 3.826 75 18.1 18:33 ( 83, 55)