Weekly Information about Bright Comets (2024 May 18: South)

Japanese version Home page	Updated on May 21, 2024
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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.

12P/Pons-Brooks It returns for the first time in 70 years. It brightened up to 3.7 mag in early April (Apr. 6, Jose Guilherme Aguiar). Now it is 5.8 mag (May 15, Marco Goiato). It will fade out rapidly after this. In the Northern Hemisphere, it is not observable now. 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) May 18 4 57.95 -9 10.6 1.563 0.929 34 5.5 18:30 ( 88, 14) May 25 5 22.02 -13 58.8 1.552 1.002 39 6.0 18:27 ( 84, 17) 13P/Olbers It returned for the first time in 68 years. Now it is 8.7 mag (May 14, Yoshimi Nagai). Fading gradually. It stays extremely low in the Northern Hemisphere. 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 18 5 24.93 32 41.8 2.165 1.343 26 7.6 18:30 (126, -6) May 25 5 47.70 35 4.6 2.127 1.296 26 7.3 18:27 (128, -8) C/2023 A3 ( Tsuchinshan-ATLAS ) It will approach to Sun down to 0.4 a.u. in late September, and it is expected to brighten up to 0 mag. Now it is 10.0 mag (May 13, Marco Goiato). It will brighten rapidly after this. 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. At the high light, in the Northern Hemisphere, it will be observable in good condition after the perihelion passage. In the Southern Hemisphere, it will be observable in the low sky before and after the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 12 36.21 1 24.6 1.755 2.530 130 9.8 20:49 (180, 54) May 25 12 18.59 2 5.4 1.768 2.431 119 9.6 20:04 (180, 53) 46P/Wirtanen The condition is bad in this apparition. It brightens up to 10 mag in early summer, however, it is not observable at all. It will fade out rapidly after this. It will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 4 23.01 21 2.0 2.035 1.055 10 10.3 18:30 (109,-10) May 25 4 54.10 22 54.8 2.035 1.058 10 10.2 18:27 (111,-10) 479P/2023 WM26 ( Elenin ) First return of a new periodic comet which was discovered in 2011, half a year after the perihelion passage. It brightened very rapidly. Now it is 12.0 mag (May 1, Thomas Lehmann). It will fade out rapidly after this. It will be fainter than 18 mag in September. 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 18 9 42.73 -20 26.3 0.626 1.256 97 11.0 18:30 (152, 74) May 25 10 10.73 -22 35.6 0.634 1.272 98 11.1 18:27 (151, 76) C/2021 S3 ( PanSTARRS ) It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 11.6 mag (May 14, Osamu Miyazaki). It will fade out rapidly after this. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 20 33.74 51 24.4 1.690 1.886 84 11.4 4:50 (180, 4) May 25 20 36.25 54 10.7 1.752 1.955 85 11.6 4:25 (180, 1) 154P/Brewington It has not been observed yet in this apparition. It will turn to fade out rapidly after the peak. It stays extremely low. But it will become high in summer in the Northern Hemisphere. It brightens up to 11.5 mag in early summer. But it locates very low around the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 1 42.26 16 50.7 2.402 1.582 28 11.9 5:21 (244, 6) May 25 2 2.32 19 29.3 2.370 1.569 29 11.7 5:25 (240, 7) C/2023 V4 ( Camarasa-Duszanowicz ) Now it is 12.1 mag (Apr. 27, Hiroshi Abe). It will turn to fade out rapidly after the peak. It locates somewhat low in the Northern Hemisphere. 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 18 4 17.05 39 38.8 2.017 1.140 21 12.3 18:30 (125,-21) May 25 4 39.88 44 1.2 1.972 1.125 24 12.1 18:27 (129,-23) C/2022 E2 ( ATLAS ) Now it is 12.0 mag (May 4, Seiichi Yoshida). It stays 12 mag for a while. It will be unobservable in June. But it will be observable again in July in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 6 50.58 33 42.0 4.473 3.818 44 12.7 18:30 (139, 6) May 25 6 52.10 34 9.9 4.542 3.802 38 12.7 18:27 (136, 3) C/2023 C2 ( ATLAS ) It is expected to brighten up to 12.5 mag in summer. Now it is 14.8 mag (May 7, Chris Wyatt). Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear in August. In the Southern Hemisphere, it stays observable in good condition. Around the high light, it is observable in good condition in the Southern Hemisphere, but it locates very low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 16 26.39 -78 2.6 2.446 3.094 121 13.8 0:47 ( 0, 47) May 25 16 11.06 -77 43.4 2.372 3.047 123 13.7 0:04 ( 0, 47) C/2021 G2 ( ATLAS ) Now it is 13.5 mag (May 7, Chris Wyatt). It stays 14 mag for a while. In the Northern Hemisphere, it will be unobservable in August. 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 18 11 52.49 -28 9.3 4.376 5.059 127 13.7 20:07 (180, 83) May 25 11 53.61 -27 0.7 4.437 5.050 122 13.8 19:40 (180, 82) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 13.3 mag (May 5, Thomas Lehmann). Fading slowly. 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 18 0 33.32 -46 8.0 4.648 4.547 78 13.9 5:21 (302, 50) May 25 0 36.01 -47 29.4 4.611 4.604 83 14.0 5:25 (304, 55) 29P/Schwassmann-Wachmann 1 Now it is 13.2 mag (Apr. 27, Hiroshi Abe). It will be unobservable in July. 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) May 18 8 17.28 20 0.5 6.566 6.202 64 14.0 18:30 (148, 28) May 25 8 20.86 19 44.4 6.666 6.204 58 14.1 18:27 (143, 26) C/2022 L2 ( ATLAS ) Now it is 13.9 mag (May 2, Thomas Lehmann). Fading slowly. In the Northern Hemisphere, it will be unobservable in June. 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 18 10 12.17 -28 54.3 2.325 2.782 106 14.1 18:30 (171, 84) May 25 10 2.70 -27 18.4 2.468 2.801 98 14.2 18:27 (130, 79) 32P/Comas Sola Now it is 14.0 mag (Apr. 27, Thomas Lehmann). Fading slowly. It will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 6 47.77 29 59.1 2.648 2.040 43 14.4 18:30 (137, 9) May 25 7 6.31 29 37.5 2.701 2.048 41 14.5 18:27 (135, 8) C/2023 R2 ( PanSTARRS ) It will brighten rapidly after this. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be unobservable soon. It brightens up to 11 mag in August. But it is not observable around the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 4 40.26 3 35.1 2.603 1.705 21 14.9 18:30 ( 97, 3) May 25 4 58.06 4 14.0 2.523 1.616 20 14.6 18:27 ( 96, 1) 144P/Kushida It brightened up to 8.9 mag from January to March (Feb. 13, Chris Wyatt). Now it is 13.7 mag (May 7, Chris Wyatt). 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) May 18 9 13.01 11 54.4 1.769 1.877 79 14.7 18:30 (160, 41) May 25 9 29.01 10 50.8 1.877 1.925 77 15.2 18:27 (157, 41) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 14.5 mag (Apr. 27, Hiroshi Abe). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it will be unobservable in June. But it will be observable again in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 5 32.71 13 21.4 6.680 5.804 27 14.8 18:30 (112, 7) May 25 5 36.66 13 47.3 6.786 5.862 22 14.8 18:27 (109, 3) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 16.2 mag (May 6, ATLAS Chile). It stays 16 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) May 18 10 36.02 -49 47.5 7.458 7.920 113 15.0 18:50 ( 0, 75) May 25 10 36.89 -49 13.9 7.556 7.965 110 15.1 18:27 ( 2, 76) C/2019 U5 ( PanSTARRS ) Now it is 14.7 mag (May 12, ATLAS South Africa). Fading 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 July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 7 21.60 -33 27.1 5.296 5.125 74 15.1 18:30 ( 80, 54) May 25 7 22.72 -32 55.6 5.404 5.166 71 15.2 18:27 ( 78, 49) 130P/McNaught-Hughes Now it is 15.4 mag (Apr. 9, E. Cortes, N. Paul). It stays 15 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 18 0 7.45 -4 44.1 2.179 1.845 57 15.2 5:21 (245, 38) May 25 0 22.54 -3 16.6 2.137 1.855 60 15.2 5:25 (240, 40) C/2022 S4 ( Lemmon ) Now it is 16.1 mag (Feb. 22, ATLAS Chile). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting higher gradually. The brightness evolution is slower than originally expected. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 3 25.58 -37 14.1 3.258 2.834 56 15.4 5:21 (304, 17) May 25 3 38.32 -38 39.9 3.186 2.819 59 15.3 5:25 (303, 21) C/2022 QE78 ( ATLAS ) Now it is 15.9 mag (Mar. 26, ATLAS Chile). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it will be unobservable in June. But it will be observable again in June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 5 11.13 0 37.6 7.356 6.492 29 15.7 18:30 ( 99, 11) May 25 5 16.21 1 3.9 7.362 6.466 25 15.7 18:27 ( 96, 7) 192P/Shoemaker-Levy 1 It has not been observed yet in this apparition. It is expected to brighten up to 15 mag in summer. It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in June. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 1 52.17 -1 58.3 2.191 1.467 34 16.0 5:21 (261, 16) May 25 2 11.91 0 51.5 2.179 1.465 34 15.7 5:25 (257, 17) 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 (May 3, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting higher gradually. 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 18 3 33.48 -61 24.5 16.497 16.368 80 15.7 5:21 (328, 27) May 25 3 37.56 -61 29.8 16.442 16.344 82 15.7 5:25 (326, 30) 37P/Forbes It will brighten up to 14 mag from summer to autumn. Now it is 16.0 mag (May 5, Yukihiro Sugiyama). Brightening slowly. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it stays observable in good condition. Around the high light, it is observable in good condition in the Southern Hemisphere. But it locates extremely low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 12 26.28 -18 44.0 1.285 2.120 134 15.9 20:40 (180, 74) May 25 12 24.99 -18 13.0 1.302 2.082 127 15.7 20:12 (180, 73) 473P/2023 W1 ( NEAT ) First return of a new periodic comet which brightened up to 10 mag in 2001. It brightened up to 12.5 mag from February to March (Feb. 29, Thomas Lehmann). Now it is 14.1 mag (May 1, Thomas Lehmann). Fading rapidly. It will be fainter than 18 mag in June. It locates somewhat low in the Northern Hemisphere. 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 18 6 14.83 65 10.6 2.180 1.754 52 15.8 18:30 (157,-20) May 25 7 6.00 64 15.4 2.237 1.806 52 16.3 18:27 (159,-17) 62P/Tsuchinshan 1 It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 13.8 mag (May 3, Hirohisa Sato). Fading rapidly. It will be fainter than 18 mag in June. 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) May 18 12 11.95 4 16.7 1.298 2.040 123 15.9 20:26 (180, 51) May 25 12 16.61 3 13.6 1.411 2.093 118 16.4 20:04 (180, 52) C/2022 N2 ( PanSTARRS ) It is expected to brighten up to 13 mag in 2025 autumn, and it will be observable in good condition. Now it is 16.4 mag (May 9, 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 18 22 48.77 -6 28.0 5.506 5.354 76 16.0 5:21 (226, 53) May 25 22 52.28 -6 1.2 5.362 5.314 81 15.9 5:25 (215, 56) C/2019 T4 ( ATLAS ) It brightened up to 11.1 mag in early 2022 (Mar. 31, 2022, F. Kugel, J.-G. Bosch, J. Nicolas). Now it is 15.9 mag (May 3, Katsumi Yoshimoto). Fading slowly. 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) May 18 17 40.37 31 46.6 6.438 7.014 121 15.9 1:57 (180, 23) May 25 17 37.75 32 15.9 6.457 7.055 122 16.0 1:27 (180, 23) 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 16.0 mag (May 11, 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. It locates somewhat low in the Southern Hemisphere. But it will become high in summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 5 30.73 -41 16.1 4.991 4.672 66 16.1 18:30 ( 61, 35) May 25 5 38.10 -40 8.0 5.063 4.718 64 16.2 18:27 ( 61, 32) 125P/Spacewatch Now it is 15.8 mag (May 3, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in July. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 21 20.34 -4 41.0 1.238 1.681 96 16.2 5:21 (188, 59) May 25 21 29.87 -4 3.8 1.208 1.709 100 16.4 5:19 (180, 59) C/2023 F3 ( ATLAS ) Now it is 16.4 mag (Apr. 28, Jean-Claude Merlin). It stays 16 mag for a while. In the Northern Hemisphere, it will be unobservable 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) May 18 15 0.79 -52 9.3 4.677 5.549 146 16.3 23:14 ( 0, 73) May 25 14 46.39 -51 38.0 4.667 5.531 145 16.3 22:32 ( 0, 73) 146P/Shoemaker-LINEAR It will brighten up to 14.5 mag in summer. Now it is 17.9 mag (May 6, Hidetaka Sato). Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear in June. 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 18 0 10.12 -22 7.2 1.816 1.682 66 16.9 5:21 (265, 48) May 25 0 31.36 -20 17.8 1.746 1.642 67 16.5 5:25 (261, 49) 227P/Catalina-LINEAR It brightened up to 14.5 mag from February to March (Mar. 11, W. Pei). Now it is 16.0 mag (May 13, A. Diepvens). It will fade out rapidly after this. It will be fainter than 18 mag in June. 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) May 18 10 3.78 17 28.3 1.449 1.762 89 16.6 18:30 (177, 38) May 25 10 18.58 15 26.3 1.528 1.788 86 16.9 18:27 (173, 40) 65P/Gunn Now it is 16.0 mag (May 4, Yukihiro Sugiyama). It stays 17 mag for a while. 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) May 18 12 33.72 4 59.4 2.742 3.459 128 16.6 20:48 (180, 50) May 25 12 32.46 4 42.8 2.807 3.444 121 16.6 20:19 (180, 50) 299P/Catalina-PanSTARRS Now it is 16.1 mag (May 12, ATLAS Chile). 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 18 15 44.02 -28 17.0 2.154 3.158 171 16.7 0:02 (180, 83) May 25 15 39.29 -27 42.7 2.155 3.159 170 16.7 23:25 (180, 83) C/2019 E3 ( ATLAS ) Very far object. Now it is 17.1 mag (Apr. 2, 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 18 2 46.37 -63 6.2 10.429 10.360 83 16.7 5:21 (327, 33) May 25 2 49.53 -63 5.0 10.395 10.364 85 16.7 5:25 (327, 36) C/2021 X1 ( Maury-Attard ) It brightened up to 14 mag in early 2023 and 2023 autumn. Now it is 18.3 mag (May 7, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It stays observable in good condition. It is fainter than this ephemeris recently. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 22 45.10 17 29.6 4.874 4.615 69 16.9 5:21 (209, 32) May 25 22 42.42 18 20.0 4.802 4.658 75 16.9 5:25 (199, 34) C/2022 R6 ( PanSTARRS ) Now it is 16.5 mag (May 12, ATLAS South Africa). It stays 17 mag for a while. 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 summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 5 30.63 -25 52.8 7.829 7.263 52 16.9 18:30 ( 77, 29) May 25 5 35.94 -25 25.1 7.837 7.243 51 16.9 18:27 ( 76, 25) 89P/Russell 2 It will brighten up to 16 mag in summer. Now it is 16.9 mag (May 12, 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 18 22 54.11 -20 29.2 2.188 2.255 80 17.0 5:21 (246, 62) May 25 23 4.95 -19 52.6 2.124 2.264 84 16.9 5:25 (238, 65) 362P/(457175) 2008 GO98 Now it is 17.6 mag (Mar. 20, ATLAS South Africa). 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 18 15 14.36 -2 38.9 1.907 2.886 162 16.9 23:28 (180, 58) May 25 15 10.34 -2 0.2 1.925 2.882 156 16.9 22:56 (180, 57) C/2022 T1 ( Lemmon ) Now it is 16.7 mag (May 7, ATLAS Chile). Fading slowly. It will be fainter than 18 mag 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) May 18 14 1.68 -21 24.9 2.592 3.545 156 16.9 22:16 (180, 76) May 25 14 0.85 -20 26.0 2.645 3.561 150 17.0 21:47 (180, 75) C/2023 H5 ( Lemmon ) Now it is 16.9 mag (May 6, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in August. 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) May 18 10 9.01 17 55.1 5.329 5.436 90 17.2 18:30 (178, 37) May 25 10 9.33 18 28.4 5.417 5.403 83 17.2 18:27 (171, 36) C/2023 T3 ( Fuls ) Now it is 16.7 mag (May 9, ATLAS Chile). It stays 17 mag for a while. It will be unobservable in June in the Northern Hemisphere, or in August 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 18 8 9.44 -5 27.7 4.431 4.209 70 17.2 18:30 (128, 49) May 25 8 15.44 -5 25.8 4.481 4.176 66 17.2 18:27 (123, 45) C/2024 A1 ( ATLAS ) Now it is 17.1 mag (May 13, 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 lower gradually. But it will be getting higher again after July. It stays 15 mag for a long time from late 2024 to early 2026. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 6 30.89 -36 23.7 5.387 5.112 69 17.2 18:30 ( 71, 45) May 25 6 36.32 -35 1.8 5.400 5.075 66 17.2 18:27 ( 71, 41) C/2024 C4 ( ATLAS ) Now it is 16.9 mag (May 9, Catalina Sky Survey). It will fade out rapidly after this. It will be fainter than 18 mag in June. 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) May 18 15 12.94 31 16.8 1.295 2.083 128 17.2 23:25 (180, 24) May 25 15 0.52 33 50.9 1.421 2.147 122 17.6 22:46 (180, 21) C/2022 U1 ( Leonard ) Now it is 17.5 mag (May 4, Toshihiko Ikemura, Hirohisa Sato). 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 18 22 43.52 43 52.3 4.548 4.226 65 17.5 5:21 (198, 8) May 25 22 39.13 44 48.8 4.470 4.232 69 17.5 5:25 (191, 9) C/2024 G3 ( ATLAS ) It approaches to Sun down to 0.09 a.u. on Jan. 13, 2025. According to the calculation, it will brighten up to -1 mag. But probably, it will be disintegrated. At the high light, it may be observable after the perihelion passage only in the Southern Hemisphere. Now it is 17.9 mag (May 10, ATLAS Chile). Brightening 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 18 16 0.80 -80 23.3 3.576 4.163 119 18.0 0:23 ( 0, 45) May 25 15 14.05 -80 10.2 3.472 4.080 120 17.8 22:59 ( 0, 45) C/2023 H2 ( Lemmon ) It approached to Earth down to 0.2 a.u. in early November, and brightened up to 6.2 mag (Nov. 11, Marco Goiato). Fading gradually. It will be fainter than 18 mag soon. 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 18 2 28.25 -54 56.5 3.212 3.126 76 17.9 5:21 (317, 33) May 25 2 41.15 -56 40.3 3.229 3.207 79 18.0 5:25 (319, 36) 103P/Hartley 2 It approached to Earth down to 0.38 a.u., and brightened up to 8.0 mag in last autumn (Sept. 29, Virgilio Gonano). Now it is 18.7 mag (May 5, Mt. Lemmon Survey). Fading gradually. 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) May 18 9 5.71 4 9.3 2.654 2.681 80 17.9 18:30 (154, 48) May 25 9 14.29 4 2.7 2.797 2.736 76 18.1 18:27 (148, 46) 150P/LONEOS Now it is 17.8 mag (May 4, ATLAS Chile). 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 18 10 2.96 -14 32.7 1.390 1.858 100 17.9 18:30 (172, 69) May 25 10 17.24 -14 37.6 1.461 1.881 97 18.1 18:27 (165, 69) 349P/Lemmon Now it is 17.9 mag (May 3, John Maikner). 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 18 14 5.63 -21 50.3 1.545 2.511 157 17.9 22:19 (180, 77) May 25 14 2.27 -21 26.9 1.577 2.510 150 18.0 21:49 (180, 77) C/2020 F2 ( ATLAS ) Now it is 17.7 mag (May 4, Yasukazu Ikari). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 11 22.65 22 20.4 9.327 9.631 104 17.9 19:37 (180, 33) May 25 11 20.47 22 20.7 9.459 9.647 97 18.0 19:07 (180, 33) P/2003 T12 ( SOHO ) It was observed at three apparitions in 2003, 2012 and 2016. It has not been observed yet in this apparition. It will brighten up to 15.5 mag in July. It brightens up to 15.5 mag, but it will turn to fade out rapidly after that. It will be unobservable in June in the Northern Hemisphere, or in July in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 18 23 53.74 7 17.5 1.162 1.030 56 21.1 5:21 (232, 32) May 25 0 35.29 10 25.4 1.121 0.940 51 20.1 5:25 (231, 28)