Weekly Information about Bright Comets (2024 Apr. 13: North)

Japanese version Home page	Updated on April 13, 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 about 1 mag in outburst on Apr. 3. Now it is 4.1 mag (Apr. 12, Virgilio Gonano). It will turn to fade out rapidly after the peak. In the Northern Hemisphere, it will be unobservable soon. 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. 13 2 58.26 15 27.3 1.609 0.796 23 4.7 19:59 (106, 3) Apr. 20 3 24.11 10 37.8 1.606 0.781 22 4.6 20:06 (104, -1) C/2021 S3 ( PanSTARRS ) It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 10.7 mag (Apr. 12, 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. 13 19 51.82 31 16.4 1.404 1.575 79 10.2 4:02 (267, 60) Apr. 20 20 3.64 36 11.5 1.454 1.631 80 10.4 3:51 (257, 62) 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. 11, Marco Goiato). 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. 13 14 8.65 -3 28.8 2.016 3.005 168 10.8 0:45 ( 0, 51) Apr. 20 13 51.97 -2 28.8 1.916 2.912 170 10.6 0:01 ( 0, 52) 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. 11, Chris Wyatt). 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. 13 4 1.14 19 50.3 2.299 1.646 38 11.1 19:59 (102, 18) Apr. 20 4 14.63 22 26.7 2.281 1.579 35 10.7 20:06 (107, 16) 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. 13 8 5.54 -9 19.3 0.625 1.280 101 11.2 19:59 ( 27, 42) Apr. 20 8 19.14 -11 26.5 0.623 1.261 98 11.0 20:06 ( 32, 37) 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. 13 2 4.96 8 2.5 2.137 1.161 9 12.1 19:59 (109,-11) Apr. 20 2 30.01 10 53.2 2.105 1.126 9 11.7 20:06 (112,-11) 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). It will fade out rapidly after this. 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. 13 7 43.51 16 10.6 1.288 1.655 91 12.3 19:59 ( 57, 60) Apr. 20 8 2.75 15 29.9 1.376 1.696 89 12.7 20:06 ( 61, 57) 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. 13 6 53.36 31 10.5 3.993 3.917 78 12.6 19:59 ( 94, 58) Apr. 20 6 51.10 31 44.0 4.102 3.895 71 12.6 20:06 ( 99, 50) 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. 13 12 5.26 8 46.6 0.827 1.781 153 13.1 22:37 ( 0, 64) Apr. 20 12 3.92 8 1.8 0.907 1.832 146 13.7 22:08 ( 0, 63) C/2023 V4 ( Camarasa-Duszanowicz ) It is expected to brighten up to 12 mag in early summer. Now it is 13.0 mag (Mar. 27, Ken-ichi Kadota). Brightening 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. 13 3 3.20 18 27.8 2.189 1.353 25 13.4 19:59 (109, 6) Apr. 20 3 14.53 22 32.5 2.164 1.295 22 13.1 20:06 (115, 4) 154P/Brewington It has not been observed yet in this apparition. Brightening gradually. 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. 13 0 10.54 3 13.6 2.611 1.700 19 13.6 4:02 (261, -7) Apr. 20 0 27.89 5 55.3 2.564 1.670 21 13.2 3:51 (259, -5) 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. 13 11 56.51 -38 4.9 1.833 2.713 144 13.5 22:26 ( 0, 17) Apr. 20 11 26.94 -36 36.7 1.885 2.723 138 13.6 21:29 ( 0, 18) 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 will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 13 0 13.93 -41 21.2 4.789 4.262 53 13.7 4:02 (302,-30) Apr. 20 0 18.36 -42 3.1 4.771 4.319 57 13.7 3:51 (303,-28) 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. 13 11 55.84 -34 1.5 4.238 5.113 147 13.7 22:28 ( 0, 21) Apr. 20 11 54.09 -32 54.5 4.241 5.101 145 13.7 21:58 ( 0, 22) 29P/Schwassmann-Wachmann 1 Now it is 14.0 mag (Apr. 7, 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. 13 8 5.29 21 2.1 6.011 6.193 95 13.8 19:59 ( 57, 67) Apr. 20 8 6.77 20 52.5 6.125 6.195 89 13.9 20:06 ( 68, 61) 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 13.6 mag (Mar. 14, 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) Apr. 13 2 25.79 55 52.4 2.004 1.532 48 13.9 19:59 (145, 21) Apr. 20 3 0.26 59 12.4 2.026 1.570 49 14.2 20:06 (148, 23) 32P/Comas Sola Now it is 14.1 mag (Mar. 12, Chris Wyatt). Fading slowly. It will be unobservable in July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 13 5 17.12 29 41.0 2.377 2.026 57 14.2 19:59 (103, 38) Apr. 20 5 34.65 30 0.9 2.432 2.025 54 14.2 20:06 (105, 35) 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. 13 5 15.35 10 38.6 5.998 5.508 56 14.4 19:59 ( 83, 28) Apr. 20 5 18.36 11 15.9 6.152 5.567 50 14.4 20:06 ( 88, 22) C/2023 C2 ( ATLAS ) It is expected to brighten up to 12.5 mag in summer. Now it is 15.2 mag (Mar. 16, Thomas Lehmann). 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. 13 16 58.50 -75 50.2 2.899 3.337 107 14.5 3:35 ( 0,-21) Apr. 20 16 59.58 -76 36.9 2.799 3.287 110 14.4 3:09 ( 0,-22) C/2019 U5 ( PanSTARRS ) Now it is 14.4 mag (Apr. 7, Chris Wyatt). 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. 13 7 25.82 -37 38.8 4.727 4.925 95 14.6 19:59 ( 24, 12) Apr. 20 7 23.29 -36 37.3 4.841 4.964 91 14.7 20:06 ( 31, 9) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 13.7 mag (Mar. 7, Thomas Lehmann). It stays 15 mag for a while. 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. 13 10 40.89 -52 36.6 7.074 7.694 125 14.7 21:13 ( 0, 2) Apr. 20 10 38.65 -52 5.4 7.134 7.740 123 14.8 20:43 ( 0, 3) 130P/McNaught-Hughes Now it is 15.2 mag (Mar. 18, E. Cortes). 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 will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 13 22 46.02 -12 22.1 2.386 1.823 45 15.3 4:02 (286, 1) Apr. 20 23 3.05 -10 50.6 2.345 1.824 47 15.3 3:51 (285, 2) 227P/Catalina-LINEAR It brightened up to 14.5 mag from February to March (Mar. 11, W. Pei). Now it is 15.4 mag (Mar. 23, 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 13 8 48.97 27 14.6 1.105 1.661 103 15.4 19:59 ( 47, 79) Apr. 20 9 3.76 25 23.0 1.167 1.676 100 15.6 20:06 ( 55, 74) C/2024 C4 ( ATLAS ) Now it is 15.3 mag (Mar. 17, J. E. Rogers, B. Haeusler, D. Parrott). 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. 13 16 29.51 0 28.1 0.946 1.789 133 15.4 3:05 ( 0, 55) Apr. 20 16 14.95 8 48.7 0.963 1.844 139 15.6 2:23 ( 0, 63) 125P/Spacewatch Now it is 16.1 mag (Mar. 14, ATLAS Chile). 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. 13 20 12.65 -9 7.5 1.393 1.569 80 15.5 4:02 (310, 31) Apr. 20 20 28.60 -8 8.8 1.362 1.587 82 15.6 3:51 (310, 32) 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. 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. 13 22 26.67 -9 2.2 6.172 5.553 48 15.6 4:02 (286, 7) Apr. 20 22 31.60 -8 29.4 6.049 5.513 53 15.5 3:51 (287, 10) 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. 13 2 33.97 -32 33.4 3.563 2.936 44 15.7 19:59 ( 68,-28) Apr. 20 2 42.88 -33 12.1 3.514 2.912 46 15.7 20:06 ( 70,-33) 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 15.6 mag (Mar. 15, 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. 13 17 47.84 28 6.7 6.457 6.814 106 15.7 4:02 (326, 82) Apr. 20 17 47.28 28 58.2 6.440 6.854 110 15.8 3:51 (354, 84) 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. 13 4 52.67 -48 57.9 4.624 4.444 73 15.7 19:59 ( 39,-14) Apr. 20 5 0.36 -47 9.7 4.695 4.489 72 15.8 20:06 ( 43,-16) C/2022 QE78 ( ATLAS ) Now it is 15.8 mag (Mar. 22, Ken-ichi Kadota). 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. 13 4 48.50 -2 6.2 7.203 6.628 51 15.8 19:59 ( 76, 15) Apr. 20 4 52.56 -1 29.5 7.248 6.600 46 15.8 20:06 ( 81, 10) 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. 13 3 14.11 -61 34.2 16.743 16.490 73 15.8 19:59 ( 34,-32) Apr. 20 3 17.75 -61 27.6 16.698 16.465 74 15.8 20:06 ( 35,-35) C/2023 R2 ( PanSTARRS ) Now it is 16.9 mag (Mar. 23, Ken-ichi Kadota). It will brighten rapidly after this. It stays extremely low in the Northern Hemisphere. 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. 13 3 28.90 -0 13.0 2.935 2.151 31 16.2 19:59 ( 89, 1) Apr. 20 3 41.10 0 35.5 2.880 2.063 29 15.9 20:06 ( 93, -4) 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 14.6 mag (Mar. 27, Ken-ichi Kadota). 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. 13 10 31.84 4 2.4 0.512 1.410 134 16.0 21:05 ( 0, 59) Apr. 20 10 51.55 4 35.9 0.604 1.480 132 16.6 20:57 ( 0, 59) C/2022 T1 ( Lemmon ) Now it is 16.9 mag (Mar. 17, ATLAS Chile). Fading slowly. 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. 13 14 11.48 -26 15.7 2.525 3.483 159 16.1 0:47 ( 0, 29) Apr. 20 14 9.31 -25 24.1 2.511 3.493 165 16.1 0:17 ( 0, 29) C/2023 F3 ( ATLAS ) Now it is 17.1 mag (Mar. 19, ATLAS Chile). 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. 13 16 9.26 -51 43.2 5.000 5.646 125 16.5 2:45 ( 0, 3) Apr. 20 15 57.35 -52 10.3 4.902 5.626 132 16.5 2:06 ( 0, 3) 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. 13 16 15.67 -45 56.7 3.634 4.328 128 16.5 2:51 ( 0, 9) Apr. 20 16 8.51 -45 17.4 3.615 4.388 135 16.5 2:17 ( 0, 10) 65P/Gunn Now it is 16.5 mag (Mar. 18, ATLAS Chile). 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. 13 12 51.31 4 49.8 2.562 3.536 163 16.5 23:23 ( 0, 60) Apr. 20 12 46.67 5 3.5 2.575 3.520 156 16.5 22:50 ( 0, 60) C/2024 A2 ( ATLAS ) Now it is 16.9 mag (Mar. 15, 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. 13 5 35.88 -31 2.5 1.945 1.892 71 16.7 19:59 ( 47, 5) Apr. 20 5 39.09 -25 31.0 2.045 1.885 66 16.8 20:06 ( 56, 4) 37P/Forbes It will brighten up to 14 mag from summer to autumn. Now it is 18.2 mag (Mar. 17, ATLAS Chile). Brightening gradually. 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. 13 12 53.75 -21 28.1 1.335 2.319 165 17.0 23:25 ( 0, 33) Apr. 20 12 46.53 -21 4.2 1.303 2.278 161 16.7 22:50 ( 0, 34) 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 16.6 mag (Mar. 14, Ken-ichi Kadota). 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. 13 8 26.45 3 8.0 1.944 2.399 104 16.7 19:59 ( 27, 55) Apr. 20 8 33.59 3 34.9 2.083 2.457 99 17.0 20:06 ( 38, 53) 299P/Catalina-PanSTARRS Now it is 16.6 mag (Mar. 9, Toshihiko Ikemura, Hirohisa Sato). 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. 13 16 2.30 -29 53.3 2.341 3.158 137 16.8 2:38 ( 0, 25) Apr. 20 16 0.15 -29 45.3 2.280 3.157 145 16.8 2:08 ( 0, 25) 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. 13 22 49.04 13 11.3 5.139 4.401 38 16.8 4:02 (264, 15) Apr. 20 22 49.30 14 2.5 5.103 4.443 44 16.8 3:51 (266, 19) C/2019 E3 ( ATLAS ) Very far object. Now it is 17.1 mag (Feb. 28, ATLAS Chile). It stays 17 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. 13 2 29.41 -64 14.9 10.571 10.344 74 16.8 19:59 ( 32,-37) Apr. 20 2 32.78 -63 52.9 10.548 10.347 75 16.8 20:06 ( 33,-41) C/2022 R6 ( PanSTARRS ) Now it is 16.7 mag (Mar. 16, ATLAS Chile). It stays 17 mag for a while. 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 June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 13 5 6.85 -29 0.5 7.725 7.364 65 16.9 19:59 ( 52, 2) Apr. 20 5 11.13 -28 17.0 7.753 7.343 62 16.9 20:06 ( 57, -3) C/2022 U3 ( Bok ) Now it is 17.2 mag (Mar. 2, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. It will be unobservable in May. But it will be observable again in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 13 5 11.49 25 22.7 5.390 4.898 55 17.0 19:59 ( 98, 35) Apr. 20 5 17.80 25 0.5 5.468 4.889 50 17.0 20:06 (102, 29) 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 16.6 mag (Mar. 15, Thomas Lehmann). 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. 13 8 8.65 -37 4.6 3.254 3.628 103 17.2 19:59 ( 16, 16) Apr. 20 8 8.39 -35 9.0 3.406 3.713 99 17.4 20:06 ( 24, 15) 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. 13 15 32.63 -7 10.6 2.010 2.914 148 17.3 2:08 ( 0, 48) Apr. 20 15 30.05 -6 12.2 1.964 2.907 155 17.2 1:38 ( 0, 49) C/2021 T4 ( Lemmon ) It brightened up to 7.8 mag in late July in 2023 (July 20, 2023, Thomas Lehmann). Now it is 16.5 mag (Mar. 18, ATLAS Chile). 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. 13 12 55.69 20 36.7 2.647 3.547 149 17.2 23:26 ( 0, 76) Apr. 20 12 41.72 21 37.1 2.765 3.616 142 17.4 22:45 ( 0, 77) 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. 13 10 16.50 13 58.0 4.936 5.605 127 17.2 20:48 ( 0, 69) Apr. 20 10 13.80 14 55.3 5.002 5.571 119 17.2 20:18 ( 0, 70) C/2023 T3 ( Fuls ) Now it is 17.1 mag (Mar. 19, 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. 13 7 47.74 -6 30.9 4.153 4.379 96 17.2 19:59 ( 34, 42) Apr. 20 7 50.83 -6 12.2 4.209 4.344 90 17.2 20:06 ( 43, 39) 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. 13 9 2.39 -15 25.0 1.091 1.772 115 17.3 19:59 ( 7, 39) Apr. 20 9 12.47 -15 6.1 1.143 1.784 112 17.4 20:06 ( 15, 39) C/2021 S4 ( Tsuchinshan ) Now it is 17.0 mag (Mar. 2, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It will be unobservable soon in the Southern Hemisphere, or in June in the Northern Hemisphere. 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. 13 5 3.57 38 55.3 7.216 6.722 56 17.3 19:59 (115, 39) Apr. 20 5 9.14 38 51.6 7.306 6.726 51 17.4 20:06 (117, 33) C/2024 A1 ( ATLAS ) Now it is 17.8 mag (Mar. 16, ATLAS South Africa). 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. 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. 13 6 8.78 -44 30.3 5.330 5.301 82 17.4 19:59 ( 33, -1) Apr. 20 6 12.32 -42 44.3 5.337 5.263 80 17.3 20:06 ( 38, -4) 89P/Russell 2 It will brighten up to 16 mag in summer. It stays 17 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. 13 21 50.12 -24 8.9 2.508 2.225 62 17.5 4:02 (303, 4) Apr. 20 22 4.10 -23 22.5 2.445 2.229 65 17.4 3:51 (303, 5) C/2022 U1 ( Leonard ) Now it is 17.7 mag (Jan. 9, Toshihiko Ikemura, Hirohisa Sato). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now, but it will be observable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Apr. 13 22 51.13 39 38.6 4.838 4.205 46 17.7 4:02 (239, 28) Apr. 20 22 51.10 40 22.9 4.796 4.207 49 17.6 3:51 (240, 31) 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. 13 11 39.01 21 35.3 8.766 9.552 139 17.7 22:11 ( 0, 76) Apr. 20 11 35.09 21 50.7 8.858 9.568 132 17.8 21:39 ( 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. 13 7 26.50 23 40.0 2.239 2.397 86 17.7 19:59 ( 74, 62) Apr. 20 7 36.45 23 43.9 2.320 2.395 81 17.8 20:06 ( 80, 57) 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 (Mar. 19, ATLAS South Africa). 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. 13 16 46.83 -6 16.8 0.826 1.660 130 17.8 3:23 ( 0, 48) Apr. 20 15 58.40 1 2.8 0.825 1.751 146 18.0 2:08 ( 0, 56) C/2022 A3 ( Lemmon-ATLAS ) Now it is 17.9 mag (Mar. 16, ATLAS South Africa). It stays 18 mag for a while. In the Northern Hemisphere, it will never be observable after this. 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. 13 4 16.91 -60 21.1 4.198 4.093 77 17.9 19:59 ( 32,-24) Apr. 20 4 18.68 -59 33.7 4.229 4.119 76 17.9 20:06 ( 35,-28)