Weekly Information about Bright Comets (2024 Apr. 20: North)

Japanese version Home page	Updated on April 22, 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 4.3 mag (Apr. 20, 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. 20 3 24.11 10 37.8 1.606 0.781 22 4.6 20:06 (104, -1) Apr. 27 3 48.40 5 40.2 1.600 0.789 23 4.6 20:14 (101, -6) 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. 17, Osamu Miyazaki). Brightening rapidly. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it will be unobservable soon. At the high light, it locates low in the Northern Hemisphere, or it is not observable in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 4 14.63 22 26.7 2.281 1.579 35 10.7 20:06 (107, 16) Apr. 27 4 29.56 25 3.0 2.259 1.514 32 10.2 20:14 (112, 13) 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 10.7 mag (Apr. 18, Chris Wyatt). It will brighten rapidly after this. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in July. In the Southern Hemisphere, it stays observable in good condition. 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. 20 13 51.97 -2 28.8 1.916 2.912 170 10.6 0:01 ( 0, 52) Apr. 27 13 33.72 -1 26.1 1.839 2.819 163 10.3 23:09 ( 0, 54) 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 in May. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 20 3.64 36 11.5 1.454 1.631 80 10.4 3:51 (257, 62) Apr. 27 20 13.88 40 39.1 1.509 1.691 81 10.7 3:41 (248, 63) 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 turn to fade out rapidly after the peak. 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. 20 8 19.14 -11 26.5 0.623 1.261 98 11.0 20:06 ( 32, 37) Apr. 27 8 35.65 -13 38.3 0.621 1.249 97 10.9 20:14 ( 36, 33) 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. 20 2 30.01 10 53.2 2.105 1.126 9 11.7 20:06 (112,-11) Apr. 27 2 56.34 13 40.4 2.078 1.096 9 11.2 20:14 (116,-11) C/2022 E2 ( ATLAS ) Now it is 12.5 mag (Apr. 2, Osamu Miyazaki). 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. 20 6 51.10 31 44.0 4.102 3.895 71 12.6 20:06 ( 99, 50) Apr. 27 6 49.80 32 15.3 4.207 3.875 64 12.7 20:14 (104, 43) 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. 20 8 2.75 15 29.9 1.376 1.696 89 12.7 20:06 ( 61, 57) Apr. 27 8 21.30 14 43.2 1.468 1.739 87 13.2 20:14 ( 64, 54) 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 appear in May. 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. 20 0 27.89 5 55.3 2.564 1.670 21 13.2 3:51 (259, -5) Apr. 27 0 45.68 8 39.1 2.519 1.643 23 12.8 3:41 (257, -4) 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. 20 3 14.53 22 32.5 2.164 1.295 22 13.1 20:06 (115, 4) Apr. 27 3 27.18 26 42.1 2.134 1.244 20 12.9 20:14 (122, 3) C/2022 L2 ( ATLAS ) Now it is 13.7 mag (Apr. 7, 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. 20 11 26.94 -36 36.7 1.885 2.723 138 13.6 21:29 ( 0, 18) Apr. 27 11 1.67 -34 44.3 1.965 2.735 131 13.7 20:37 ( 0, 20) 62P/Tsuchinshan 1 It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 12.2 mag (Apr. 9, Osamu Miyazaki). 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. 20 12 3.92 8 1.8 0.907 1.832 146 13.7 22:08 ( 0, 63) Apr. 27 12 4.05 7 11.2 0.994 1.883 140 14.2 21:41 ( 0, 62) C/2021 G2 ( ATLAS ) Now it is 13.7 mag (Apr. 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) Apr. 20 11 54.09 -32 54.5 4.241 5.101 145 13.7 21:58 ( 0, 22) Apr. 27 11 52.83 -31 44.3 4.257 5.090 142 13.7 21:30 ( 0, 23) 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. 20 0 18.36 -42 3.1 4.771 4.319 57 13.7 3:51 (303,-28) Apr. 27 0 22.58 -42 52.5 4.747 4.376 62 13.8 3:41 (305,-26) 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 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) Apr. 20 8 6.77 20 52.5 6.125 6.195 89 13.9 20:06 ( 68, 61) Apr. 27 8 8.75 20 41.4 6.239 6.197 82 13.9 20:14 ( 76, 55) 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. 20 3 0.26 59 12.4 2.026 1.570 49 14.2 20:06 (148, 23) Apr. 27 3 41.21 61 59.5 2.054 1.612 50 14.6 20:14 (150, 25) 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. 20 5 34.65 30 0.9 2.432 2.025 54 14.2 20:06 (105, 35) Apr. 27 5 52.58 30 13.0 2.487 2.025 51 14.3 20:14 (107, 31) 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. 20 16 59.58 -76 36.9 2.799 3.287 110 14.4 3:09 ( 0,-22) Apr. 27 16 57.05 -77 16.2 2.703 3.238 113 14.3 2:39 ( 0,-22) 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 in May 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. 20 5 18.36 11 15.9 6.152 5.567 50 14.4 20:06 ( 88, 22) Apr. 27 5 21.65 11 50.8 6.298 5.627 44 14.5 20:14 ( 94, 16) 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 in May. 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. 20 7 23.29 -36 37.3 4.841 4.964 91 14.7 20:06 ( 31, 9) Apr. 27 7 21.72 -35 40.7 4.956 5.004 86 14.8 20:14 ( 38, 6) 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). Fading slowly. In the Northern Hemisphere, it will be unobservable in May. 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. 20 10 38.65 -52 5.4 7.134 7.740 123 14.8 20:43 ( 0, 3) Apr. 27 10 37.05 -51 32.0 7.203 7.785 122 14.9 20:14 ( 0, 3) 130P/McNaught-Hughes Now it is 15.4 mag (Apr. 9, E. Cortes, N. Paul). It stays 15 mag for a while. It stays extremely 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. 20 23 3.05 -10 50.6 2.345 1.824 47 15.3 3:51 (285, 2) Apr. 27 23 19.72 -9 18.1 2.303 1.826 49 15.3 3:41 (284, 3) 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. 20 22 31.60 -8 29.4 6.049 5.513 53 15.5 3:51 (287, 10) Apr. 27 22 36.30 -7 57.3 5.919 5.473 59 15.4 3:41 (289, 12) 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. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 9 3.76 25 23.0 1.167 1.676 100 15.6 20:06 ( 55, 74) Apr. 27 9 18.74 23 27.7 1.232 1.694 97 15.8 20:14 ( 60, 69) 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. 20 20 28.60 -8 8.8 1.362 1.587 82 15.6 3:51 (310, 32) Apr. 27 20 43.43 -7 11.2 1.331 1.607 85 15.7 3:41 (310, 33) 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. 20 16 14.95 8 48.7 0.963 1.844 139 15.6 2:23 ( 0, 63) Apr. 27 15 59.14 16 21.5 1.011 1.901 140 15.8 1:40 ( 0, 71) 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. It locates somewhat low in the Southern Hemisphere. But it will become high in summer. The brightness evolution is slower than originally expected. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 2 42.88 -33 12.1 3.514 2.912 46 15.7 20:06 ( 70,-33) Apr. 27 2 52.45 -33 58.7 3.458 2.890 48 15.6 20:14 ( 72,-38) 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 in June. 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. 20 3 41.10 0 35.5 2.880 2.063 29 15.9 20:06 ( 93, -4) Apr. 27 3 54.25 1 23.0 2.819 1.974 26 15.7 20:14 ( 97, -8) 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. 30, 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. 20 17 47.28 28 58.2 6.440 6.854 110 15.8 3:51 (354, 84) Apr. 27 17 46.21 29 46.6 6.429 6.894 113 15.8 3:26 ( 0, 85) 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 May in the Northern Hemisphere, or in June in the Southern Hemisphere. But it will be observable again in June in the Southern Hemisphere, or in August in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 4 52.56 -1 29.5 7.248 6.600 46 15.8 20:06 ( 81, 10) Apr. 27 4 56.88 -0 54.7 7.287 6.573 41 15.8 20:14 ( 86, 4) 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. 20 3 17.75 -61 27.6 16.698 16.465 74 15.8 20:06 ( 35,-35) Apr. 27 3 21.53 -61 23.3 16.651 16.441 76 15.8 20:14 ( 36,-39) 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 15.1 mag (Apr. 10, Chris Wyatt). 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 June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 5 0.36 -47 9.7 4.695 4.489 72 15.8 20:06 ( 43,-16) Apr. 27 5 8.04 -45 29.3 4.768 4.535 70 15.9 20:14 ( 48,-19) 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. 20 14 9.31 -25 24.1 2.511 3.493 165 16.1 0:17 ( 0, 29) Apr. 27 14 7.07 -24 27.5 2.511 3.504 169 16.1 23:43 ( 0, 31) 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. 20 15 57.35 -52 10.3 4.902 5.626 132 16.5 2:06 ( 0, 3) Apr. 27 15 44.22 -52 28.0 4.820 5.606 137 16.4 1:26 ( 0, 2) 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. 20 12 46.53 -21 4.2 1.303 2.278 161 16.7 22:50 ( 0, 34) Apr. 27 12 39.76 -20 32.9 1.283 2.238 155 16.5 22:16 ( 0, 34) C/2021 Y1 ( ATLAS ) It brightened up to 13 mag in early 2023. Fading slowly. 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. 20 16 8.51 -45 17.4 3.615 4.388 135 16.5 2:17 ( 0, 10) Apr. 27 16 0.79 -44 30.1 3.607 4.447 142 16.5 1:42 ( 0, 10) 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. 20 12 46.67 5 3.5 2.575 3.520 156 16.5 22:50 ( 0, 60) Apr. 27 12 42.44 5 11.8 2.600 3.505 149 16.5 22:19 ( 0, 60) 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 in May. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 10 51.55 4 35.9 0.604 1.480 132 16.6 20:57 ( 0, 59) Apr. 27 11 8.14 4 46.6 0.704 1.551 129 17.1 20:46 ( 0, 60) 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. 20 16 0.15 -29 45.3 2.280 3.157 145 16.8 2:08 ( 0, 25) Apr. 27 15 57.06 -29 31.7 2.230 3.156 152 16.7 1:38 ( 0, 25) 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. It will be unobservable in May in the Northern Hemisphere, or in June in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 5 39.09 -25 31.0 2.045 1.885 66 16.8 20:06 ( 56, 4) Apr. 27 5 42.87 -20 39.3 2.152 1.882 60 16.9 20:14 ( 64, 1) 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. It will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 22 49.30 14 2.5 5.103 4.443 44 16.8 3:51 (266, 19) Apr. 27 22 49.09 14 54.2 5.058 4.486 50 16.8 3:41 (267, 23) 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. 20 2 32.78 -63 52.9 10.548 10.347 75 16.8 20:06 ( 33,-41) Apr. 27 2 36.22 -63 34.9 10.522 10.350 77 16.8 20:14 ( 33,-44) 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. 20 5 11.13 -28 17.0 7.753 7.343 62 16.9 20:06 ( 57, -3) Apr. 27 5 15.68 -27 36.3 7.779 7.323 59 16.9 20:14 ( 62, -8) 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 in May. 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. 20 8 33.59 3 34.9 2.083 2.457 99 17.0 20:06 ( 38, 53) Apr. 27 8 41.17 3 53.8 2.224 2.514 94 17.2 20:14 ( 47, 49) 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. 20 15 30.05 -6 12.2 1.964 2.907 155 17.2 1:38 ( 0, 49) Apr. 27 15 26.72 -5 13.9 1.931 2.901 161 17.1 1:07 ( 0, 50) 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. 20 10 13.80 14 55.3 5.002 5.571 119 17.2 20:18 ( 0, 70) Apr. 27 10 11.69 15 47.6 5.076 5.536 112 17.2 20:14 ( 18, 70) 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. 20 7 50.83 -6 12.2 4.209 4.344 90 17.2 20:06 ( 43, 39) Apr. 27 7 54.59 -5 56.1 4.266 4.309 85 17.2 20:14 ( 51, 34) 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. 20 22 4.10 -23 22.5 2.445 2.229 65 17.4 3:51 (303, 5) Apr. 27 22 17.54 -22 36.5 2.382 2.234 69 17.2 3:41 (303, 6) 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 in May. 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. 20 1 40.55 -49 20.1 3.144 2.797 60 17.3 3:51 (307,-44) Apr. 27 1 51.97 -50 32.0 3.165 2.880 64 17.4 3:41 (309,-43) 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. 20 6 12.32 -42 44.3 5.337 5.263 80 17.3 20:06 ( 38, -4) Apr. 27 6 16.36 -41 2.1 5.347 5.225 77 17.3 20:14 ( 44, -7) 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 in May. 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. 20 8 8.39 -35 9.0 3.406 3.713 99 17.4 20:06 ( 24, 15) Apr. 27 8 9.22 -33 25.1 3.562 3.797 95 17.6 20:14 ( 31, 13) C/2021 S4 ( Tsuchinshan ) Now it is 17.2 mag (Mar. 30, ATLAS-HKO, Haleakala). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in June. But it will be observable again in July. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 5 9.14 38 51.6 7.306 6.726 51 17.4 20:06 (117, 33) Apr. 27 5 15.00 38 48.5 7.389 6.731 46 17.4 20:14 (120, 28) 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 in May. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 12 41.72 21 37.1 2.765 3.616 142 17.4 22:45 ( 0, 77) Apr. 27 12 29.19 22 19.5 2.903 3.685 135 17.6 22:05 ( 0, 77) 150P/LONEOS Now it is 16.7 mag (Mar. 27, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag in May. 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. 20 9 12.47 -15 6.1 1.143 1.784 112 17.4 20:06 ( 15, 39) Apr. 27 9 23.76 -14 50.6 1.199 1.799 109 17.5 20:14 ( 22, 37) 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. In the Southern Hemisphere, it is not observable now, but it will be observable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 22 51.10 40 22.9 4.796 4.207 49 17.6 3:51 (240, 31) Apr. 27 22 50.44 41 11.0 4.746 4.211 52 17.6 3:41 (240, 34) C/2020 F2 ( ATLAS ) Now it is 17.9 mag (Apr. 1, Ken-ichi Kadota). 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) Apr. 20 11 35.09 21 50.7 8.858 9.568 132 17.8 21:39 ( 0, 77) Apr. 27 11 31.46 22 2.8 8.962 9.583 125 17.8 21:08 ( 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 in May. 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. 20 7 36.45 23 43.9 2.320 2.395 81 17.8 20:06 ( 80, 57) Apr. 27 7 47.09 23 42.1 2.401 2.394 77 17.9 20:14 ( 84, 52) 349P/Lemmon Now it is 17.9 mag (Apr. 11, ATLAS Chile). Fading slowly. It will be fainter than 18 mag in May. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 14 25.46 -23 5.4 1.533 2.520 165 18.0 0:34 ( 0, 32) Apr. 27 14 20.23 -22 53.3 1.518 2.516 170 17.9 0:01 ( 0, 32) C/2022 A3 ( Lemmon-ATLAS ) Now it is 17.4 mag (Apr. 6, ATLAS Chile). It stays 18 mag for a while. In the Northern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 4 18.68 -59 33.7 4.229 4.119 76 17.9 20:06 ( 35,-28) Apr. 27 4 21.22 -58 55.6 4.256 4.146 76 18.0 20:14 ( 37,-31) 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 16.6 mag (Apr. 13, Ken-ichi Kadota). It will fade out rapidly after this. It stays observable in good condition. It is brighter than this ephemeris recently. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 20 15 58.40 1 2.8 0.825 1.751 146 18.0 2:08 ( 0, 56) Apr. 27 15 11.34 7 42.1 0.881 1.842 154 18.4 0:54 ( 0, 62)