Weekly Information about Bright Comets (2024 May 4: North)

Japanese version Home page	Updated on May 7, 2024
Last week South Next week

Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern 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 4.8 mag (May 5, 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 4 4 11.71 0 40.5 1.589 0.818 26 4.8 20:22 ( 99,-12) May 11 4 34.69 -4 17.0 1.576 0.866 30 5.1 20:30 ( 97,-17) 13P/Olbers It returned for the first time in 68 years. It will brighten up to 7 mag in summer. Now it is 8.8 mag (May 4, Osamu Miyazaki). Brightening slowly. 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 4 4 46.11 27 38.6 2.231 1.453 30 8.4 20:22 (117, 11) May 11 5 4.49 30 12.2 2.200 1.396 28 8.0 20:30 (121, 9) 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 10.5 mag (May 5, Chris Wyatt). 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 4 13 14.50 -0 24.0 1.788 2.724 152 10.1 22:22 ( 0, 55) May 11 12 55.07 0 34.0 1.760 2.628 141 9.9 21:35 ( 0, 56) 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 turn to fade out rapidly after the peak. It will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 3 23.98 16 20.5 2.057 1.075 9 10.9 20:22 (119,-11) May 11 3 52.91 18 49.2 2.042 1.061 9 10.6 20:30 (122,-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 10.8 mag (May 2, Marco Goiato). 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 4 8 55.07 -15 53.7 0.621 1.244 96 10.8 20:22 ( 38, 29) May 11 9 17.45 -18 10.8 0.621 1.246 96 10.9 20:30 ( 40, 26) C/2021 S3 ( PanSTARRS ) It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 10.6 mag (May 4, Carlos Labordena). 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 4 20 22.42 44 39.7 1.568 1.754 82 10.9 3:31 (238, 65) May 11 20 29.09 48 14.5 1.628 1.819 83 11.2 3:22 (229, 66) 154P/Brewington It has not been observed yet in this apparition. Fading gradually. In the Northern Hemisphere, it is not observable now, but it will be observable soon. It stays extremely low in the Southern 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 4 1 3.97 11 23.9 2.477 1.619 24 12.4 3:31 (254, -2) May 11 1 22.82 14 8.4 2.438 1.599 26 12.1 3:22 (252, -1) C/2023 V4 ( Camarasa-Duszanowicz ) Now it is 12.9 mag (Apr. 14, Ken-ichi Kadota). Fading gradually. 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 4 3 41.48 30 56.8 2.099 1.200 19 12.6 20:22 (128, 2) May 11 3 57.89 35 16.3 2.060 1.165 20 12.4 20:30 (134, 2) C/2022 E2 ( ATLAS ) Now it is 13.1 mag (Apr. 7, Ken-ichi Kadota). It stays 13 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 4 6 49.34 32 45.1 4.304 3.855 57 12.7 20:22 (108, 36) May 11 6 49.63 33 13.8 4.394 3.836 50 12.7 20:30 (112, 30) 144P/Kushida It brightened up to 8.9 mag from January to March (Feb. 13, Chris Wyatt). Now it is 13.4 mag (May 4, Toshihiko Ikemura, Hirohisa Sato). 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 4 8 39.18 13 51.3 1.564 1.784 84 13.7 20:22 ( 68, 50) May 11 8 56.41 12 54.7 1.665 1.830 82 14.2 20:30 ( 71, 46) C/2021 G2 ( ATLAS ) Now it is 13.9 mag (Apr. 10, 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 4 11 52.12 -30 32.4 4.285 5.079 138 13.7 21:01 ( 0, 24) May 11 11 52.00 -29 20.3 4.325 5.069 133 13.7 20:34 ( 0, 26) C/2022 L2 ( ATLAS ) Now it is 13.9 mag (Apr. 10, Chris Wyatt). 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 4 10 41.03 -32 42.8 2.069 2.749 122 13.8 20:22 ( 7, 22) May 11 10 24.73 -30 43.7 2.191 2.764 114 13.9 20:30 ( 20, 21) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 14.4 mag (Apr. 25, ATLAS Chile). It stays 14 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 4 0 26.52 -43 49.6 4.717 4.433 67 13.8 3:31 (307,-25) May 11 0 30.13 -44 54.7 4.684 4.490 72 13.9 3:22 (310,-23) 29P/Schwassmann-Wachmann 1 Now it is 14.8 mag (Apr. 25, ATLAS-HKO, Haleakala). It will be getting lower gradually after this, and 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 4 8 11.19 20 29.1 6.351 6.199 76 14.0 20:22 ( 82, 48) May 11 8 14.04 20 15.5 6.460 6.201 70 14.0 20:30 ( 87, 41) C/2023 C2 ( ATLAS ) It is expected to brighten up to 12.5 mag in summer. Now it is 15.2 mag (Apr. 28, ATLAS Chile). 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 4 16 50.52 -77 45.8 2.612 3.189 116 14.1 2:06 ( 0,-23) May 11 16 40.04 -78 2.4 2.526 3.141 118 14.0 1:28 ( 0,-23) 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 4 6 10.81 30 16.9 2.541 2.028 49 14.3 20:22 (109, 28) May 11 6 29.24 30 12.3 2.595 2.033 46 14.4 20:30 (111, 25) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 15.0 mag (Apr. 20, ATLAS-HKO, Haleakala). It stays 15 mag for a while. It will be unobservable soon in the Northern Hemisphere, or in June in the Southern Hemisphere. But it will be observable again in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 5 25.16 12 23.3 6.435 5.686 38 14.6 20:22 ( 98, 10) May 11 5 28.87 12 53.5 6.562 5.745 33 14.7 20:30 (103, 4) 62P/Tsuchinshan 1 It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 12.4 mag (Apr. 29, Thomas Lehmann). Fading rapidly. It will be fainter than 18 mag in June. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 12 5.52 6 16.2 1.088 1.935 134 14.8 21:15 ( 0, 61) May 11 12 8.21 5 17.8 1.190 1.988 129 15.3 20:50 ( 0, 60) C/2019 U5 ( PanSTARRS ) Now it is 14.8 mag (Apr. 25, 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 4 7 20.99 -34 49.9 5.071 5.044 82 14.9 20:22 ( 44, 2) May 11 7 20.98 -34 5.2 5.185 5.085 78 15.0 20:30 ( 50, -3) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 15.9 mag (Apr. 17, ATLAS South Africa). 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 4 10 36.07 -50 57.3 7.281 7.830 119 14.9 20:22 ( 6, 4) May 11 10 35.74 -50 22.2 7.366 7.875 116 15.0 20:30 ( 12, 3) 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 15.0 mag (Apr. 25, Ken-ichi Kadota). It will fade out rapidly after this. 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 4 4 28.67 64 1.4 2.089 1.656 51 15.0 20:22 (151, 27) May 11 5 21.03 65 7.0 2.130 1.704 51 15.4 20:30 (151, 29) C/2023 R2 ( PanSTARRS ) Now it is 16.9 mag (Mar. 23, Ken-ichi Kadota). 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 4 4 8.45 2 9.1 2.752 1.884 24 15.4 20:22 (101,-12) May 11 4 23.75 2 53.3 2.680 1.795 23 15.2 20:30 (105,-15) 130P/McNaught-Hughes Now it is 15.4 mag (Apr. 9, E. Cortes, N. Paul). It stays 15 mag for a while. 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 4 23 36.03 -7 45.6 2.262 1.830 52 15.2 3:31 (283, 4) May 11 23 51.94 -6 14.0 2.220 1.837 54 15.2 3:22 (282, 6) C/2022 N2 ( PanSTARRS ) It is expected to brighten up to 11.5 mag in 2025 autumn, and it will be observable in good condition. Now it is 16.7 mag (Apr. 28, ATLAS-HKO, Haleakala). 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 4 22 40.76 -7 26.2 5.785 5.433 64 15.3 3:31 (291, 15) May 11 22 44.93 -6 56.3 5.647 5.393 70 15.2 3:22 (293, 18) 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 4 3 2.72 -34 54.1 3.395 2.870 51 15.5 20:22 ( 73,-43) May 11 3 13.74 -35 59.0 3.328 2.851 53 15.5 20:30 ( 73,-49) 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 4 5 1.43 -0 21.8 7.318 6.546 37 15.7 20:22 ( 91, -2) May 11 5 6.19 0 9.0 7.341 6.519 33 15.7 20:30 ( 96, -8) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.3 mag (Mar. 4, 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 4 3 25.43 -61 21.3 16.601 16.417 77 15.8 20:22 ( 36,-43) May 11 3 29.42 -61 21.6 16.550 16.392 79 15.7 20:30 ( 35,-47) 125P/Spacewatch Now it is 15.7 mag (Apr. 13, 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 4 20 57.04 -6 16.3 1.300 1.629 88 15.8 3:31 (310, 35) May 11 21 9.37 -5 25.7 1.269 1.654 92 16.0 3:22 (311, 36) 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 (Apr. 25, ATLAS-HKO, Haleakala). It stays 16 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) May 4 17 44.67 30 31.3 6.424 6.934 116 15.8 2:57 ( 0, 85) May 11 17 42.70 31 11.6 6.427 6.974 119 15.9 2:27 ( 0, 86) 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 15.5 mag (Apr. 20, ATLAS Chile). It stays 17 mag for a while. 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 4 5 15.67 -43 56.8 4.843 4.580 69 16.0 20:22 ( 52,-23) May 11 5 23.25 -42 32.4 4.917 4.626 67 16.0 20:30 ( 55,-27) 227P/Catalina-LINEAR It brightened up to 14.5 mag from February to March (Mar. 11, W. Pei). Now it is 15.8 mag (Apr. 19, Ken-ichi Kadota). 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 4 9 33.79 21 29.7 1.300 1.715 95 16.0 20:22 ( 64, 65) May 11 9 48.83 19 29.7 1.373 1.737 92 16.3 20:30 ( 67, 59) 37P/Forbes It will brighten up to 14 mag from summer to autumn. Now it is 16.6 mag (May 4, Toshihiko Ikemura, Hirohisa Sato). Brightening 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 4 12 33.89 -19 57.0 1.274 2.199 148 16.3 21:43 ( 0, 35) May 11 12 29.30 -19 19.6 1.275 2.159 141 16.1 21:11 ( 0, 36) C/2024 C4 ( ATLAS ) Now it is 16.0 mag (Apr. 24, ATLAS-HKO, Haleakala). 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 4 15 42.94 22 40.7 1.085 1.960 138 16.1 0:56 ( 0, 77) May 11 15 27.27 27 37.5 1.181 2.021 134 16.4 0:13 ( 0, 82) C/2022 T1 ( Lemmon ) Now it is 16.9 mag (May 4, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 14 4.93 -23 27.5 2.524 3.517 167 16.2 23:14 ( 0, 32) May 11 14 3.08 -22 26.0 2.552 3.530 163 16.2 22:44 ( 0, 33) 192P/Shoemaker-Levy 1 It has not been observed yet in this apparition. It is expected to brighten up to 15 mag in summer. Brightening slowly. 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 4 1 11.92 -7 43.5 2.227 1.486 33 16.5 3:31 (269,-15) May 11 1 32.17 -4 50.5 2.207 1.474 33 16.2 3:22 (266,-14) 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 4 15 30.16 -52 34.4 4.755 5.587 142 16.4 0:44 ( 0, 2) May 11 15 15.53 -52 28.3 4.707 5.568 145 16.3 0:02 ( 0, 2) 65P/Gunn Now it is 16.5 mag (Apr. 13, Ken-ichi Kadota). 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 4 12 38.79 5 14.0 2.637 3.490 142 16.5 21:48 ( 0, 60) May 11 12 35.85 5 9.9 2.685 3.474 135 16.6 21:17 ( 0, 60) C/2021 Y1 ( ATLAS ) It brightened up to 13 mag in early 2023. Fading slowly. 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. It has not been observed since 2023 July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 15 52.76 -43 34.8 3.614 4.507 148 16.6 1:06 ( 0, 11) May 11 15 44.71 -42 32.0 3.634 4.566 154 16.6 0:31 ( 0, 12) 299P/Catalina-PanSTARRS Now it is 16.8 mag (Apr. 19, ATLAS South Africa). It stays 17 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 4 15 53.18 -29 12.2 2.192 3.156 159 16.7 1:06 ( 0, 26) May 11 15 48.74 -28 47.1 2.167 3.157 166 16.7 0:34 ( 0, 26) 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 will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 2 39.66 -63 21.1 10.493 10.353 79 16.8 3:31 (328,-46) May 11 2 43.06 -63 11.5 10.462 10.357 81 16.8 3:22 (327,-45) C/2021 X1 ( Maury-Attard ) It brightened up to 14 mag in early 2023 and 2023 autumn. Now it is 16.4 mag (Jan. 15, Toshihiko Ikemura, Hirohisa Sato). It stays 17 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) May 4 22 48.37 15 46.2 5.003 4.528 56 16.8 3:31 (269, 27) May 11 22 47.06 16 38.2 4.941 4.571 62 16.9 3:22 (271, 32) C/2022 R6 ( PanSTARRS ) Now it is 16.6 mag (Apr. 17, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in August. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 5 20.47 -26 58.5 7.800 7.302 57 16.9 20:22 ( 66,-14) May 11 5 25.46 -26 24.0 7.817 7.282 54 16.9 20:30 ( 71,-19) 362P/(457175) 2008 GO98 Now it is 18.0 mag (Mar. 13, Jean-Claude Merlin). 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 4 15 22.82 -4 17.5 1.910 2.896 165 17.0 0:36 ( 0, 51) May 11 15 18.61 -3 25.2 1.902 2.891 165 17.0 0:04 ( 0, 51) C/2024 A2 ( ATLAS ) Now it is 17.2 mag (Apr. 25, ATLAS Chile). Fading slowly. 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 after this, and it will be unobservable in June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 5 47.06 -16 23.6 2.264 1.883 55 17.0 20:22 ( 72, -2) May 11 5 51.52 -12 39.5 2.375 1.887 49 17.1 20:30 ( 79, -6) 89P/Russell 2 It will brighten up to 16 mag in summer. Now it is 17.1 mag (Apr. 18, ATLAS Chile). It stays 17 mag for a while. 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 4 22 30.39 -21 51.7 2.318 2.240 72 17.1 3:31 (304, 8) May 11 22 42.62 -21 8.8 2.253 2.247 76 17.1 3:22 (304, 9) C/2023 H5 ( Lemmon ) Now it is 16.9 mag (Apr. 21, 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 10 10.18 16 34.9 5.157 5.503 104 17.2 20:22 ( 41, 67) May 11 10 9.29 17 17.4 5.242 5.469 97 17.2 20:30 ( 58, 62) C/2023 T3 ( Fuls ) Now it is 17.0 mag (Apr. 24, ATLAS South Africa). 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 4 7 58.97 -5 43.2 4.323 4.275 80 17.2 20:22 ( 58, 29) May 11 8 3.93 -5 33.6 4.378 4.242 75 17.2 20:30 ( 64, 24) C/2024 A1 ( ATLAS ) Now it is 17.5 mag (Apr. 17, ATLAS South Africa). It stays 17 mag for a while. 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. 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 4 6 20.85 -39 24.2 5.360 5.187 74 17.3 20:22 ( 49,-10) May 11 6 25.72 -37 51.3 5.373 5.149 71 17.3 20:30 ( 54,-14) 146P/Shoemaker-LINEAR It has not been observed yet in this apparition. It will brighten up to 14.5 mag in summer. Brightening gradually. 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 4 23 27.82 -25 22.4 1.972 1.767 63 17.7 3:31 (298, -5) May 11 23 48.92 -23 48.8 1.892 1.723 64 17.3 3:22 (296, -4) 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 17.0 mag (Apr. 14, Ken-ichi Kadota). Fading gradually. 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) May 4 8 49.09 4 5.4 2.366 2.570 89 17.5 20:22 ( 55, 45) May 11 8 57.29 4 10.5 2.510 2.626 85 17.7 20:30 ( 62, 40) 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 4 22 49.04 42 2.4 4.687 4.215 56 17.6 3:31 (241, 38) May 11 22 46.78 42 56.5 4.620 4.220 60 17.6 3:22 (241, 42) 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 will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 2 3.70 -51 52.0 3.182 2.963 68 17.6 3:31 (311,-42) May 11 2 15.78 -53 20.2 3.197 3.045 72 17.7 3:22 (313,-41) 207P/NEAT It approached to Earth down to 0.2 a.u. and it brightened up to 13.1 mag in March (Mar. 13, W. Pei). Vladimir Bezugly reported it was visible at around 12 mag in the SWAN images in late January. Now it is 17.6 mag (May 3, Toshihiko Ikemura, Hirohisa Sato). Fading rapidly. It will be fainter than 18 mag soon. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 11 22.60 4 40.6 0.810 1.622 125 17.6 20:33 ( 0, 60) May 11 11 35.62 4 22.2 0.923 1.693 122 18.1 20:30 ( 6, 59) 150P/LONEOS Now it is 17.2 mag (Apr. 27, Jean-Claude Merlin). Fading slowly. 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 4 9 36.05 -14 39.5 1.259 1.817 105 17.7 20:22 ( 29, 35) May 11 9 49.18 -14 33.3 1.323 1.836 103 17.8 20:30 ( 35, 33) C/2023 P1 ( Nishimura ) It approached to Sun down to 0.23 a.u. and brightened up to 2.5 mag in mid September in 2023 (Sept. 18, 2023, Juan Jose Gonzalez). Now it is 17.1 mag (Apr. 19, ATLAS South Africa). Fading gradually. 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 4 8 10.94 -31 52.8 3.722 3.879 91 17.7 20:22 ( 38, 11) May 11 8 13.37 -30 31.8 3.883 3.961 87 17.9 20:30 ( 44, 7) C/2023 S3 ( Lemmon ) It must have brightened up to 11 mag in winter. However, it was too low to observe at the high light. Now it is 17.1 mag (May 3, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 14 30.47 12 45.1 0.988 1.933 151 17.8 23:36 ( 0, 68) May 11 13 57.89 16 6.1 1.132 2.023 141 18.3 22:37 ( 0, 71) C/2021 T4 ( Lemmon ) It brightened up to 7.8 mag in late July in 2023 (July 20, 2023, Thomas Lehmann). Now it is 17.3 mag (May 4, Toshihiko Ikemura, Hirohisa Sato). Fading gradually. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) May 4 12 18.26 22 46.3 3.056 3.753 127 17.8 21:27 ( 0, 78) May 11 12 8.98 22 60.0 3.223 3.821 119 18.1 20:50 ( 0, 78) C/2020 F2 ( ATLAS ) Now it is 18.2 mag (May 4, Toshihiko Ikemura, Hirohisa Sato). 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 4 11 28.16 22 11.7 9.076 9.599 118 17.8 20:37 ( 0, 77) May 11 11 25.21 22 17.5 9.198 9.615 111 17.9 20:30 ( 23, 76) 349P/Lemmon Now it is 17.9 mag (Apr. 11, ATLAS Chile). Fading slowly. 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 4 14 14.94 -22 35.6 1.514 2.514 170 17.9 23:24 ( 0, 32) May 11 14 9.95 -22 13.9 1.523 2.512 164 17.9 22:51 ( 0, 33) 478P/2023 Y3 ( ATLAS ) Now it is 17.4 mag (Mar. 6, A. Diepvens). Fading slowly. 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 4 7 58.31 23 34.6 2.481 2.394 73 17.9 20:22 ( 88, 47) May 11 8 10.02 23 21.4 2.559 2.394 69 18.0 20:30 ( 91, 42)