Weekly Information about Bright Comets (2024 Apr. 27: North)

Japanese version Home page	Updated on April 27, 2024
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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 about 1 mag in outburst on Apr. 3. Now it is 4.4 mag (Apr. 25, 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) Apr. 27 3 48.40 5 40.2 1.600 0.789 23 4.6 20:14 (101, -6) May 4 4 11.71 0 40.5 1.589 0.818 26 4.8 20:22 ( 99,-12) 13P/Olbers It returned for the first time in 68 years. It will brighten up to 7.5 mag in summer. Now it is 9.8 mag (Apr. 20, Jose Guilherme Aguiar). Brightening 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) Apr. 27 4 29.56 25 3.0 2.259 1.514 32 10.2 20:14 (112, 13) May 4 4 46.11 27 38.6 2.231 1.453 30 9.8 20:22 (117, 11) 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 10.6 mag (Apr. 19, Jose Guilherme Aguiar). 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) Apr. 27 13 33.72 -1 26.1 1.839 2.819 163 10.3 23:09 ( 0, 54) May 4 13 14.50 -0 24.0 1.788 2.724 152 10.1 22:22 ( 0, 55) C/2021 S3 ( PanSTARRS ) It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 10.9 mag (Apr. 17, 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) Apr. 27 20 13.88 40 39.1 1.509 1.691 81 10.7 3:41 (248, 63) May 4 20 22.42 44 39.7 1.568 1.754 82 10.9 3:31 (238, 65) 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 11.3 mag (Apr. 10, Chris Wyatt). It will fade out rapidly after this. 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) Apr. 27 8 35.65 -13 38.3 0.621 1.249 97 10.9 20:14 ( 36, 33) May 4 8 55.07 -15 53.7 0.621 1.244 96 10.8 20:22 ( 38, 29) 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 brightens up to 10 mag, but it will turn to fade out rapidly after that. It will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 2 56.34 13 40.4 2.078 1.096 9 11.2 20:14 (116,-11) May 4 3 23.98 16 20.5 2.057 1.075 9 10.9 20:22 (119,-11) 154P/Brewington It has not been observed yet in this apparition. Brightening slowly. 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) Apr. 27 0 45.68 8 39.1 2.519 1.643 23 12.8 3:41 (257, -4) May 4 1 3.97 11 23.9 2.477 1.619 24 12.4 3:31 (254, -2) C/2023 V4 ( Camarasa-Duszanowicz ) Now it is 13.0 mag (Mar. 27, Ken-ichi Kadota). Fading slowly. It stays extremely low in the Northern Hemisphere. But it will become high in summer. 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) Apr. 27 3 27.18 26 42.1 2.134 1.244 20 12.9 20:14 (122, 3) May 4 3 41.48 30 56.8 2.099 1.200 19 12.6 20:22 (128, 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) Apr. 27 6 49.80 32 15.3 4.207 3.875 64 12.7 20:14 (104, 43) May 4 6 49.34 32 45.1 4.304 3.855 57 12.7 20:22 (108, 36) 144P/Kushida It brightened up to 8.9 mag from January to March (Feb. 13, Chris Wyatt). Now it is 11.5 mag (Apr. 11, 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) Apr. 27 8 21.30 14 43.2 1.468 1.739 87 13.2 20:14 ( 64, 54) May 4 8 39.18 13 51.3 1.564 1.784 84 13.7 20:22 ( 68, 50) 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) Apr. 27 11 1.67 -34 44.3 1.965 2.735 131 13.7 20:37 ( 0, 20) May 4 10 41.03 -32 42.8 2.069 2.749 122 13.8 20:22 ( 7, 22) 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) Apr. 27 11 52.83 -31 44.3 4.257 5.090 142 13.7 21:30 ( 0, 23) May 4 11 52.12 -30 32.4 4.285 5.079 138 13.7 21:01 ( 0, 24) C/2020 V2 ( ZTF ) It was observed at 9-10 mag for a long time in 2023. Now it is 13.1 mag (Mar. 5, Chris Wyatt). 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) Apr. 27 0 22.58 -42 52.5 4.747 4.376 62 13.8 3:41 (305,-26) May 4 0 26.52 -43 49.6 4.717 4.433 67 13.8 3:31 (307,-25) 29P/Schwassmann-Wachmann 1 Now it is 14.1 mag (Apr. 10, Chris Wyatt). It will be getting lower gradually after this, and it will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 8 8.75 20 41.4 6.239 6.197 82 13.9 20:14 ( 76, 55) May 4 8 11.19 20 29.1 6.351 6.199 76 14.0 20:22 ( 82, 48) C/2023 C2 ( ATLAS ) It is expected to brighten up to 12.5 mag in summer. Now it is 15.3 mag (Apr. 20, ATLAS Chile). Brightening slowly. In the Northern Hemisphere, it is not observable now. 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) Apr. 27 16 57.05 -77 16.2 2.703 3.238 113 14.3 2:39 ( 0,-22) May 4 16 50.52 -77 45.8 2.612 3.189 116 14.1 2:06 ( 0,-23) 62P/Tsuchinshan 1 It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 11.4 mag (Apr. 10, Chris Wyatt). 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) Apr. 27 12 4.05 7 11.2 0.994 1.883 140 14.2 21:41 ( 0, 62) May 4 12 5.52 6 16.2 1.088 1.935 134 14.8 21:15 ( 0, 61) 32P/Comas Sola Now it is 14.3 mag (Apr. 1, Hiroshi Abe). Fading slowly. It will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 5 52.58 30 13.0 2.487 2.025 51 14.3 20:14 (107, 31) May 4 6 10.81 30 16.9 2.541 2.028 49 14.3 20:22 (109, 28) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 14.1 mag (Apr. 10, Chris Wyatt). 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) Apr. 27 5 21.65 11 50.8 6.298 5.627 44 14.5 20:14 ( 94, 16) May 4 5 25.16 12 23.3 6.435 5.686 38 14.6 20:22 ( 98, 10) 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 14.4 mag (Apr. 1, Hiroshi Abe). 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) Apr. 27 3 41.21 61 59.5 2.054 1.612 50 14.6 20:14 (150, 25) May 4 4 28.67 64 1.4 2.089 1.656 51 15.0 20:22 (151, 27) C/2019 U5 ( PanSTARRS ) Now it is 14.9 mag (Apr. 19, ATLAS South Africa). Fading slowly. In the Northern Hemisphere, it will be unobservable soon. 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) Apr. 27 7 21.72 -35 40.7 4.956 5.004 86 14.8 20:14 ( 38, 6) May 4 7 20.99 -34 49.9 5.071 5.044 82 14.9 20:22 ( 44, 2) 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 15 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) Apr. 27 10 37.05 -51 32.0 7.203 7.785 122 14.9 20:14 ( 0, 3) May 4 10 36.07 -50 57.3 7.281 7.830 119 14.9 20:22 ( 6, 4) 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) Apr. 27 23 19.72 -9 18.1 2.303 1.826 49 15.3 3:41 (284, 3) May 4 23 36.03 -7 45.6 2.262 1.830 52 15.2 3:31 (283, 4) 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. 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) Apr. 27 22 36.30 -7 57.3 5.919 5.473 59 15.4 3:41 (289, 12) May 4 22 40.76 -7 26.2 5.785 5.433 64 15.3 3:31 (291, 15) 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) Apr. 27 3 54.25 1 23.0 2.819 1.974 26 15.7 20:14 ( 97, -8) May 4 4 8.45 2 9.1 2.752 1.884 24 15.4 20:22 (101,-12) 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) Apr. 27 2 52.45 -33 58.7 3.458 2.890 48 15.6 20:14 ( 72,-38) May 4 3 2.72 -34 54.1 3.395 2.870 51 15.5 20:22 ( 73,-43) 125P/Spacewatch Now it is 15.7 mag (Apr. 13, Ken-ichi Kadota). Fading gradually. 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) Apr. 27 20 43.43 -7 11.2 1.331 1.607 85 15.7 3:41 (310, 33) May 4 20 57.04 -6 16.3 1.300 1.629 88 15.8 3:31 (310, 35) C/2022 QE78 ( ATLAS ) Now it is 15.9 mag (Mar. 26, ATLAS Chile). It stays 16 mag for a while. It will be unobservable in June in the Southern Hemisphere, or in July in the Northern Hemisphere. But it will be observable again in June in the Southern Hemisphere, or in July in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 4 56.88 -0 54.7 7.287 6.573 41 15.8 20:14 ( 86, 4) May 4 5 1.43 -0 21.8 7.318 6.546 37 15.7 20:22 ( 91, -2) 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 Northern Hemisphere, it is not observable until 2030. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 3 21.53 -61 23.3 16.651 16.441 76 15.8 20:14 ( 36,-39) May 4 3 25.43 -61 21.3 16.601 16.417 77 15.8 20:22 ( 36,-43) 227P/Catalina-LINEAR It brightened up to 14.5 mag from February to March (Mar. 11, W. Pei). Now it is 14.9 mag (Apr. 11, W. Pei). 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) Apr. 27 9 18.74 23 27.7 1.232 1.694 97 15.8 20:14 ( 60, 69) May 4 9 33.79 21 29.7 1.300 1.715 95 16.0 20:22 ( 64, 65) 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 (Mar. 31, ATLAS-MLO, Mauna Loa). 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) Apr. 27 17 46.21 29 46.6 6.429 6.894 113 15.8 3:26 ( 0, 85) May 4 17 44.67 30 31.3 6.424 6.934 116 15.8 2:57 ( 0, 85) C/2024 C4 ( ATLAS ) Now it is 15.6 mag (Apr. 1, Ken-ichi Kadota). 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. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 15 59.14 16 21.5 1.011 1.901 140 15.8 1:40 ( 0, 71) May 4 15 42.94 22 40.7 1.085 1.960 138 16.1 0:56 ( 0, 77) 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 16 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) Apr. 27 5 8.04 -45 29.3 4.768 4.535 70 15.9 20:14 ( 48,-19) May 4 5 15.67 -43 56.8 4.843 4.580 69 16.0 20:22 ( 52,-23) C/2022 T1 ( Lemmon ) Now it is 16.9 mag (Apr. 19, ATLAS South Africa). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 14 7.07 -24 27.5 2.511 3.504 169 16.1 23:43 ( 0, 31) May 4 14 4.93 -23 27.5 2.524 3.517 167 16.2 23:14 ( 0, 32) 37P/Forbes It will brighten up to 14 mag from summer to autumn. Now it is 16.9 mag (Apr. 19, ATLAS South Africa). 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) Apr. 27 12 39.76 -20 32.9 1.283 2.238 155 16.5 22:16 ( 0, 34) May 4 12 33.89 -19 57.0 1.274 2.199 148 16.3 21:43 ( 0, 35) C/2023 F3 ( ATLAS ) Now it is 16.3 mag (Apr. 17, G. Duszanowicz). 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) Apr. 27 15 44.22 -52 28.0 4.820 5.606 137 16.4 1:26 ( 0, 2) May 4 15 30.16 -52 34.4 4.755 5.587 142 16.4 0:44 ( 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) Apr. 27 12 42.44 5 11.8 2.600 3.505 149 16.5 22:19 ( 0, 60) May 4 12 38.79 5 14.0 2.637 3.490 142 16.5 21:48 ( 0, 60) C/2021 Y1 ( ATLAS ) It brightened up to 13 mag in early 2023. 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) Apr. 27 16 0.79 -44 30.1 3.607 4.447 142 16.5 1:42 ( 0, 10) May 4 15 52.76 -43 34.8 3.614 4.507 148 16.6 1:06 ( 0, 11) 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) Apr. 27 15 57.06 -29 31.7 2.230 3.156 152 16.7 1:38 ( 0, 25) May 4 15 53.18 -29 12.2 2.192 3.156 159 16.7 1:06 ( 0, 26) 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 will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 27 22 49.09 14 54.2 5.058 4.486 50 16.8 3:41 (267, 23) May 4 22 48.37 15 46.2 5.003 4.528 56 16.8 3:31 (269, 27) 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) Apr. 27 2 36.22 -63 34.9 10.522 10.350 77 16.8 20:14 ( 33,-44) May 4 2 39.66 -63 21.1 10.493 10.353 79 16.8 3:31 (328,-46) C/2024 A2 ( ATLAS ) Now it is 17.0 mag (Apr. 11, 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) Apr. 27 5 42.87 -20 39.3 2.152 1.882 60 16.9 20:14 ( 64, 1) May 4 5 47.06 -16 23.6 2.264 1.883 55 17.0 20:22 ( 72, -2) 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. 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) Apr. 27 5 15.68 -27 36.3 7.779 7.323 59 16.9 20:14 ( 62, -8) May 4 5 20.47 -26 58.5 7.800 7.302 57 16.9 20:22 ( 66,-14) 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) Apr. 27 15 26.72 -5 13.9 1.931 2.901 161 17.1 1:07 ( 0, 50) May 4 15 22.82 -4 17.5 1.910 2.896 165 17.0 0:36 ( 0, 51) 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 17.0 mag (Apr. 16, ATLAS South Africa). 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) Apr. 27 11 8.14 4 46.6 0.704 1.551 129 17.1 20:46 ( 0, 60) May 4 11 22.60 4 40.6 0.810 1.622 125 17.6 20:33 ( 0, 60) 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) Apr. 27 22 17.54 -22 36.5 2.382 2.234 69 17.2 3:41 (303, 6) May 4 22 30.39 -21 51.7 2.318 2.240 72 17.1 3:31 (304, 8) C/2023 H5 ( Lemmon ) Now it is 17.0 mag (Apr. 1, Ken-ichi Kadota). 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) Apr. 27 10 11.69 15 47.6 5.076 5.536 112 17.2 20:14 ( 18, 70) May 4 10 10.18 16 34.9 5.157 5.503 104 17.2 20:22 ( 41, 67) C/2023 T3 ( Fuls ) Now it is 17.1 mag (Apr. 20, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in June 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) Apr. 27 7 54.59 -5 56.1 4.266 4.309 85 17.2 20:14 ( 51, 34) May 4 7 58.97 -5 43.2 4.323 4.275 80 17.2 20:22 ( 58, 29) 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 16.9 mag (Apr. 12, A. Nagy Melykuti). 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) Apr. 27 8 41.17 3 53.8 2.224 2.514 94 17.2 20:14 ( 47, 49) May 4 8 49.09 4 5.4 2.366 2.570 89 17.5 20:22 ( 55, 45) 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) Apr. 27 6 16.36 -41 2.1 5.347 5.225 77 17.3 20:14 ( 44, -7) May 4 6 20.85 -39 24.2 5.360 5.187 74 17.3 20:22 ( 49,-10) 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 17.3 mag (Apr. 20, ATLAS-HKO, Haleakala). It will fade out rapidly after this. 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) Apr. 27 15 11.34 7 42.1 0.881 1.842 154 17.4 0:54 ( 0, 62) May 4 14 30.47 12 45.1 0.988 1.933 151 17.8 23:36 ( 0, 68) 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) Apr. 27 1 51.97 -50 32.0 3.165 2.880 64 17.4 3:41 (309,-43) May 4 2 3.70 -51 52.0 3.182 2.963 68 17.6 3:31 (311,-42) 150P/LONEOS Now it is 17.4 mag (Apr. 18, ATLAS Chile). Fading slowly. 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) Apr. 27 9 23.76 -14 50.6 1.199 1.799 109 17.5 20:14 ( 22, 37) May 4 9 36.05 -14 39.5 1.259 1.817 105 17.7 20:22 ( 29, 35) 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) Apr. 27 8 9.22 -33 25.1 3.562 3.797 95 17.6 20:14 ( 31, 13) May 4 8 10.94 -31 52.8 3.722 3.879 91 17.7 20:22 ( 38, 11) C/2022 U1 ( Leonard ) Now it is 17.8 mag (Apr. 10, D. Buczynski). 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) Apr. 27 22 50.44 41 11.0 4.746 4.211 52 17.6 3:41 (240, 34) May 4 22 49.04 42 2.4 4.687 4.215 56 17.6 3:31 (241, 38) C/2021 T4 ( Lemmon ) It brightened up to 7.8 mag in late July in 2023 (July 20, 2023, Thomas Lehmann). Now it is 16.8 mag (Apr. 4, Catalina Sky Survey). It will fade out rapidly after this. 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) Apr. 27 12 29.19 22 19.5 2.903 3.685 135 17.6 22:05 ( 0, 77) May 4 12 18.26 22 46.3 3.056 3.753 127 17.8 21:27 ( 0, 78) 146P/Shoemaker-LINEAR It has not been observed yet in this apparition. It will brighten up to 14.5 mag in summer. Brightening rapidly. 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) Apr. 27 23 6.88 -26 47.8 2.057 1.811 61 18.1 3:41 (299, -5) May 4 23 27.82 -25 22.4 1.972 1.767 63 17.7 3:31 (298, -5) C/2020 F2 ( ATLAS ) Now it is 17.9 mag (Apr. 1, Ken-ichi Kadota). 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) Apr. 27 11 31.46 22 2.8 8.962 9.583 125 17.8 21:08 ( 0, 77) May 4 11 28.16 22 11.7 9.076 9.599 118 17.8 20:37 ( 0, 77) 478P/2023 Y3 ( ATLAS ) Now it is 17.4 mag (Mar. 6, A. Diepvens). Fading slowly. It will be fainter than 18 mag soon. 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) Apr. 27 7 47.09 23 42.1 2.401 2.394 77 17.9 20:14 ( 84, 52) May 4 7 58.31 23 34.6 2.481 2.394 73 17.9 20:22 ( 88, 47) 349P/Lemmon Now it is 17.9 mag (Apr. 11, ATLAS Chile). Fading slowly. 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) Apr. 27 14 20.23 -22 53.3 1.518 2.516 170 17.9 0:01 ( 0, 32) May 4 14 14.94 -22 35.6 1.514 2.514 170 17.9 23:24 ( 0, 32)