Weekly Information about Bright Comets (2025 May 31: South)

Japanese version Home page	Updated on June 2, 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.

217P/LINEAR It is visible at 12-13 mag in the SWAN images (May 2, Vladimir Bezugly). Fading gradually. In the Northern Hemisphere, it is not observable now, but it will appear in July. 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) May 31 2 44.58 8 5.7 2.011 1.229 29 13.2 5:29 (252, 11) June 7 3 10.33 9 44.8 2.020 1.238 29 13.2 5:32 (250, 11) 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 12.6 mag (Apr. 26, Hiroshi Abe). Fading slowly. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. But it will become high in spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 19 43.66 28 1.1 3.467 3.957 111 13.2 3:10 (180, 27) June 7 19 34.06 28 34.4 3.479 4.038 116 13.3 2:33 (180, 26) 21P/Giacobini-Zinner It brightened up to 11 mag in the SWAN images (Jan. 27, Vladimir Bezugly). It will fade out rapidly after this. Now it is not observable. It will appear in July in the Southern Hemisphere, or in September in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 4 46.68 6 17.4 2.312 1.366 16 13.3 18:26 ( 93, -6) June 7 5 9.50 5 53.2 2.367 1.428 16 13.7 18:25 ( 92, -7) C/2024 G3 ( ATLAS ) It approached to Sun down to 0.09 a.u. on Jan. 13. It brightened up to -2 or -3 mag and it was detected even in the daylight. The nucleus was disintegrated on Jan. 19. However, its remnant is still visible. Fading gradually. 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) May 31 2 38.02 -53 57.5 2.843 2.841 79 13.8 5:29 (314, 40) June 7 2 49.66 -55 47.0 2.881 2.940 83 14.0 5:32 (316, 43) 29P/Schwassmann-Wachmann 1 Now it is 12.4 mag (May 27, Thomas Lehmann). It will be unobservable 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) May 31 9 43.40 10 9.4 6.461 6.280 75 14.0 18:26 (154, 41) June 7 9 46.14 9 54.6 6.568 6.281 69 14.1 18:25 (147, 39) C/2021 G2 ( ATLAS ) Now it is 13.4 mag (May 20, Osamu Miyazaki). It stays 15 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 15 11.90 -4 5.4 4.448 5.376 153 14.0 22:35 (180, 59) June 7 15 9.60 -3 23.7 4.517 5.397 147 14.1 22:06 (180, 58) C/2025 F2 ( SWAN ) It brightened rapidly up to 7.8 mag on Apr. 8 (Osamu Miyazaki). The nucleus was disintegrated, however, its remnant is still visible. Fading rapidly. It will be fainter than 18 mag in August. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 5 27.80 -14 25.3 1.352 0.849 38 14.1 18:26 ( 81, 14) June 7 5 36.43 -19 31.5 1.447 0.991 43 14.7 18:25 ( 75, 13) C/2022 N2 ( PanSTARRS ) Now it is 14.9 mag (Feb. 4, Alfons Diepvens). It stays 14 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) May 31 1 55.95 16 16.1 4.625 3.864 37 14.2 5:29 (238, 14) June 7 2 4.58 17 7.9 4.557 3.856 41 14.2 5:32 (233, 18) 48P/Johnson Now it is 15.2 mag (May 10, Taras Prystavski). 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) May 31 1 37.98 0 18.7 2.677 2.125 47 14.5 5:29 (247, 29) June 7 1 51.52 1 16.2 2.641 2.144 50 14.6 5:32 (243, 31) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 14.6 mag (Apr. 29, Ken-ichi Kadota). 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) May 31 1 52.80 50 13.2 5.024 4.323 41 14.7 5:29 (213, -9) June 7 1 53.33 50 48.6 5.005 4.356 45 14.7 5:32 (209, -7) C/2022 QE78 ( ATLAS ) Now it is 14.6 mag (May 10, Alfons Diepvens). It stays 15 mag for a while. It will be unobservable soon. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 7 3.15 17 5.3 6.316 5.529 36 14.9 18:26 (122, 13) June 7 7 9.25 17 21.5 6.369 5.522 30 14.9 18:25 (119, 9) 49P/Arend-Rigaux Now it is 14.5 mag (May 23, Thomas Lehmann). It will fade out rapidly after this. It will be fainter than 18 mag in September. It will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 7 2.21 24 25.2 2.256 1.535 34 14.9 18:26 (128, 8) June 7 7 25.87 24 40.9 2.308 1.564 33 15.1 18:25 (127, 8) 65P/Gunn Now it is 15.4 mag (May 25, Thomas Lehmann). It stays 16 mag for a while. 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) May 31 18 58.03 -29 25.1 2.029 2.927 146 15.2 2:25 (180, 84) June 7 18 54.87 -29 57.2 1.983 2.926 153 15.1 1:55 (180, 85) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 14.7 mag (May 24, 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) May 31 4 30.34 -65 25.3 15.104 15.090 87 15.2 5:29 (332, 29) June 7 4 35.81 -65 30.2 15.062 15.067 88 15.2 5:32 (331, 31) C/2024 E1 ( Wierzchos ) It is expected to brighten up to 5 mag in 2026 January. Now it is 15.9 mag (May 14, B. Haeusler). Brightening gradually. In the Northern Hemisphere, it stays observable in good condition. 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) May 31 17 47.02 57 54.4 3.414 3.705 98 15.4 1:14 (180, -3) June 7 17 34.76 58 13.3 3.327 3.623 98 15.2 0:34 (180, -3) C/2023 R1 ( PanSTARRS ) It is expected to brighten up to 13 mag in early summer in 2026. Now it is 16.0 mag (May 13, ATLAS-MLO, Mauna Loa). Brightening slowly. 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) May 31 22 28.28 23 26.5 4.581 4.554 82 15.4 5:29 (187, 31) June 7 22 24.21 23 59.3 4.428 4.517 88 15.3 5:23 (180, 31) 43P/Wolf-Harrington Now it is 16.5 mag (Apr. 7, Alfons Diepvens). It stays 15 mag for a while. Now it is not observable. It will appear in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 5 26.93 20 31.9 3.466 2.489 13 15.3 18:26 (111, -6) June 7 5 41.41 20 28.7 3.474 2.480 9 15.3 18:25 (109, -9) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 16.0 mag (May 23, Thomas Lehmann). It stays 15 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 19 38.35 -20 0.3 5.188 5.963 136 15.5 3:05 (180, 75) June 7 19 34.54 -19 30.3 5.072 5.922 143 15.5 2:34 (180, 74) 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 (May 24, Martin Masek). 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 August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 23 26.68 35 55.9 3.443 3.178 66 15.5 5:29 (198, 16) June 7 23 31.47 38 13.1 3.425 3.226 70 15.5 5:32 (192, 15) C/2024 J2 ( Wierzchos ) Brightened rapidly. Now it is 14.6 mag (Jan. 31, Thomas Lehmann). Fading slowly. 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) May 31 1 47.21 10 1.6 2.679 2.026 41 15.5 5:29 (241, 20) June 7 1 58.41 8 27.7 2.642 2.066 45 15.5 5:32 (238, 25) C/2024 L5 ( ATLAS ) Now it is 15.3 mag (May 13, Ken-ichi Kadota). Fading slowly. It will be getting lower gradually after this, and it will be unobservable 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) May 31 11 17.80 -8 18.4 3.134 3.518 103 15.7 18:42 (180, 63) June 7 11 12.27 -6 54.0 3.288 3.533 95 15.8 18:25 (172, 62) C/2023 T3 ( Fuls ) Now it is 15.3 mag (May 4, Toshiyuki Takahashi). Fading slowly. 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) May 31 13 7.98 -26 26.6 2.954 3.727 133 15.8 20:32 (180, 82) June 7 13 9.92 -25 27.7 3.037 3.747 127 15.8 20:07 (180, 81) P/2023 S1 ( PanSTARRS ) It brightened up to 14.4 mag in winter (Feb. 4, Ken-ichi Kadota). Now it is 16.1 mag (May 20, Thomas Lehmann). 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) May 31 9 30.14 10 50.0 2.816 2.681 71 15.8 18:26 (151, 40) June 7 9 39.24 9 56.2 2.907 2.691 67 15.9 18:25 (145, 38) C/2023 F3 ( ATLAS ) Now it is 16.2 mag (May 8, Ken-ichi Kadota). It stays 17 mag for a while. It will be unobservable soon in the Northern Hemisphere, or in September in the Southern Hemisphere. But it will be observable again in September in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 10 40.41 -30 58.5 4.946 5.266 102 16.2 18:26 (130, 84) June 7 10 38.05 -29 36.7 5.062 5.275 96 16.2 18:25 (113, 78) C/2023 H5 ( Lemmon ) Now it is 15.6 mag (May 14, Alfons Diepvens). It stays 16 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) May 31 10 36.38 65 20.5 4.547 4.320 70 16.2 18:26 (177,-10) June 7 10 38.46 65 6.1 4.607 4.317 67 16.2 18:25 (175,-10) 47P/Ashbrook-Jackson Now it is 17.1 mag (May 7, ATLAS Chile). Brightening slowly. 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) May 31 23 2.43 -15 6.6 2.780 2.936 88 16.3 5:29 (218, 66) June 7 23 8.36 -14 28.3 2.679 2.924 93 16.2 5:32 (203, 68) 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 lower gradually after this, and it will be unobservable in July. But it will be observable again in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 7 15.56 -12 39.8 7.151 6.592 53 16.5 18:26 ( 99, 35) June 7 7 20.48 -12 8.6 7.209 6.588 48 16.5 18:25 ( 96, 30) 496P/2024 S3 ( Hill ) First return of a new periodic comet which brightened up to 15 mag in 2010. Now it is 16.0 mag (May 11, ATLAS-HKO, Haleakala). It will fade out rapidly after this. It will be fainter than 18 mag in July. It locates somewhat low in the Northern Hemisphere. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 8 42.67 31 1.1 2.229 1.869 56 16.5 18:26 (150, 17) June 7 9 2.72 29 33.3 2.312 1.908 54 16.7 18:25 (148, 17) 88P/Howell It will brighten up to 9 mag in 2026 spring. Now it is 17.3 mag (Apr. 30, Andrew Pearce). Brightening gradually. 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 10 25.21 14 11.7 2.883 2.944 83 16.9 18:26 (169, 40) June 7 10 29.54 13 35.7 2.941 2.903 77 16.8 18:25 (161, 40) C/2019 U5 ( PanSTARRS ) Now it is 16.4 mag (May 4, ATLAS South Africa). 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 getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 5 36.76 -36 28.7 7.936 7.487 60 16.8 18:26 ( 62, 26) June 7 5 39.41 -36 18.4 7.991 7.531 59 16.9 18:25 ( 60, 22) C/2019 E3 ( ATLAS ) Very far object. Now it is 16.9 mag (Dec. 20, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 1 27.59 -53 18.9 10.781 10.740 84 17.0 5:29 (313, 50) June 7 1 29.04 -53 27.4 10.726 10.751 88 17.0 5:32 (315, 54) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 16.6 mag (May 15, ATLAS South Africa). 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) May 31 22 13.12 -68 36.2 7.075 7.512 111 17.0 5:29 (358, 57) June 7 22 7.98 -69 35.5 7.068 7.565 115 17.0 5:08 ( 0, 56) 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 17.0 mag (May 4, 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) May 31 23 38.54 40 16.7 6.016 5.637 63 17.2 5:29 (198, 11) June 7 23 40.76 40 57.2 6.004 5.700 67 17.2 5:32 (193, 12) C/2024 T5 ( ATLAS ) Now it is 18.0 mag (Feb. 2, ATLAS Chile). It stays 17 mag for a while. 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. It is expected to brighten up to 13 mag in winter between 2026 and 2027. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 2 34.18 -37 14.1 7.309 6.945 65 17.2 5:29 (294, 36) June 7 2 39.71 -37 12.5 7.210 6.902 68 17.2 5:32 (291, 41) 362P/(457175) 2008 GO98 Now it is 17.4 mag (Sept. 20, Taras Prystavski). 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) May 31 21 50.74 2 50.9 2.984 3.287 98 17.2 5:17 (180, 52) June 7 21 53.07 3 22.5 2.908 3.303 104 17.2 4:52 (180, 52) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 17.7 mag (May 13, Jean-Claude Merlin). 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) May 31 11 50.59 -56 47.2 9.772 10.302 118 17.2 19:15 ( 0, 68) June 7 11 50.65 -56 16.9 9.864 10.345 115 17.2 18:47 ( 0, 69) C/2024 G2 ( ATLAS ) Now it is 17.3 mag (May 6, ATLAS Chile). It stays 18 mag for a while. 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) May 31 11 4.53 -26 25.3 4.970 5.349 106 17.3 18:29 (180, 81) June 7 11 3.99 -24 51.6 5.075 5.348 100 17.3 18:25 (151, 79) C/2025 K1 ( ATLAS ) It is expected to brighten up to 7.5 mag in October. Now it is 17.7 mag (May 26, Hidetaka Sato). It will brighten rapidly after this. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in September. But it will be observable again in June. In the Southern Hemisphere, it stays observable in good condition. It is not observable for a month around the perihelion passage. But in the Northern Hemisphere, it stays observable in good condition until mid September and after late October. In the Southern Hemisphere, it is observable only before the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 22 26.33 16 1.1 2.415 2.540 85 17.7 5:29 (187, 39) June 7 22 25.73 17 1.3 2.199 2.439 91 17.3 5:24 (180, 38) C/2023 Q1 ( PanSTARRS ) It brightened up to 13.8 mag in winter (Dec. 30, Thomas Lehmann). Now it is 17.2 mag (May 2, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will be getting lower gradually. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 9 29.33 38 0.6 3.499 3.203 64 17.3 18:26 (162, 14) June 7 9 38.43 36 10.9 3.617 3.246 60 17.4 18:25 (157, 15) 302P/Lemmon-PanSTARRS Now it is 17.3 mag (Oct. 31, ATLAS Chile). 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) May 31 0 12.64 -2 51.2 3.558 3.310 67 17.4 5:29 (230, 46) June 7 0 19.54 -2 19.0 3.472 3.314 72 17.3 5:32 (223, 49) 195P/Hill Now it is 17.1 mag (May 1, A. Nagy Melykuti). 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 July. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 7 11.66 -5 22.6 5.068 4.451 47 17.3 18:26 (105, 30) June 7 7 18.48 -5 31.2 5.121 4.449 44 17.3 18:25 (102, 26) C/2024 X2 ( ATLAS ) Now it is 17.3 mag (May 6, ATLAS Chile). It stays 18 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 lower gradually after this, and it will be unobservable in August. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 7 49.01 -23 2.2 3.988 3.691 65 17.5 18:26 ( 93, 47) June 7 7 54.12 -21 10.7 4.068 3.686 61 17.5 18:25 ( 92, 41) C/2024 G6 ( ATLAS ) Now it is 16.9 mag (May 9, 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) May 31 16 36.19 -20 44.1 5.663 6.677 178 17.5 0:04 (180, 76) June 7 16 30.07 -19 57.1 5.657 6.664 172 17.5 23:26 (180, 75) C/2024 G4 ( PanSTARRS ) Now it is 17.9 mag (May 5, Alfons Diepvens). 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) May 31 16 56.97 17 20.6 4.581 5.400 140 17.6 0:24 (180, 38) June 7 16 54.38 17 22.1 4.562 5.378 139 17.6 23:50 (180, 38) C/2023 V1 ( Lemmon ) Now it is 17.5 mag (Apr. 28, Yasukazu Ikari). It stays 18 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 August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 17 53.16 63 37.5 4.949 5.103 93 17.6 1:20 (180, -9) June 7 17 33.66 63 42.3 4.940 5.100 93 17.6 0:33 (180, -9) 13P/Olbers It returned for the first time in 68 years. It brightened up to 6.2 mag in early last summer (July 1, Virgilio Gonano). Now it is 17.3 mag (May 24, Mike Olason). It will fade out rapidly after this. It will be fainter than 18 mag soon. 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) May 31 18 21.72 -27 16.3 3.298 4.235 154 17.6 1:49 (180, 82) June 7 18 15.13 -27 52.1 3.321 4.299 162 17.8 1:15 (180, 83) 12P/Pons-Brooks It returns for the first time in 70 years. It brightened up to 3.7 mag in early April in 2024 (Apr. 6, 2024, Jose Guilherme Aguiar). Now it is 17.4 mag (May 24, Mike Olason). Fading slowly. It will be fainter than 18 mag soon. 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) May 31 16 3.38 -49 22.6 4.207 5.124 151 17.7 23:27 ( 0, 76) June 7 15 55.37 -48 33.4 4.275 5.187 151 17.8 22:51 ( 0, 76) C/2023 U1 ( Fuls ) Now it is 17.3 mag (Mar. 6, ATLAS Chile). 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) May 31 3 17.42 -48 34.5 5.495 5.277 72 17.8 5:29 (310, 32) June 7 3 19.90 -49 7.8 5.462 5.295 75 17.8 5:32 (309, 37) C/2023 H1 ( PanSTARRS ) Now it is 16.7 mag (May 13, 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) May 31 20 19.58 -19 34.4 4.010 4.689 126 17.9 3:46 (180, 75) June 7 20 18.65 -19 12.1 3.948 4.707 133 17.9 3:18 (180, 74) C/2024 B1 ( Lemmon ) It brightened up to 13.1 mag in autumn (Nov. 1, Thomas Lehmann). Now it is 16.9 mag (May 14, Ken-ichi Kadota). Fading gradually. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 31 16 58.54 7 44.9 2.415 3.329 149 17.9 0:26 (180, 47) June 7 16 48.76 6 23.2 2.474 3.396 150 18.1 23:44 (180, 49) C/2022 U1 ( Leonard ) Now it is 17.6 mag (Apr. 26, Yasukazu Ikari). 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) May 31 19 9.63 15 50.7 4.828 5.484 125 17.9 2:37 (180, 39) June 7 19 2.43 15 37.6 4.796 5.519 131 17.9 2:02 (180, 39)