Weekly Information about Bright Comets (2026 Jan. 10: North)

Japanese version Home page	Updated on January 14, 2026
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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.

C/2025 A6 ( Lemmon ) It brightened up to 3.7 mag in late October (Oct. 26, Juan Jose Gonzalez). Appearing in the morning sky in the Southern Hemisphere. Now it is brighter than originally predicted by 4 mag. Now it is 8.6 mag (Jan. 13, Martin Masek). Fading rapidly. In the Northern Hemisphere, it is not observable now, but it will appear in April. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 17 10.72 -42 20.2 2.086 1.390 34 7.7 5:38 (318, -7) Jan. 17 17 8.96 -44 42.2 2.091 1.502 41 8.3 5:38 (323, -5) C/2024 E1 ( Wierzchos ) It was originally expected to brighten up to 5 mag in January. But actually, the brightness evolution is slower than originally expected. It will be 8 mag at best. Now it is 9.6 mag (Dec. 10, Mike Olason). It will turn to fade out rapidly after the peak. Now it is not observable. It will appear soon in the Southern Hemisphere, or in February in the Northern Hemisphere. Nagy Barnabas reported it is visible at 8 mag on Dec. 24 in the SOHO spacecraft LASCO images. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 19 43.20 -32 42.9 1.548 0.617 11 8.4 18:36 ( 63,-20) Jan. 17 20 22.96 -37 35.9 1.423 0.573 17 7.9 18:41 ( 58,-21) 24P/Schaumasse Now it is 9.1 mag (Jan. 9, Toru Yusa). It will fade out rapidly after this. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 13 27.07 12 37.0 0.595 1.184 93 8.3 5:38 (341, 66) Jan. 17 13 53.09 11 17.0 0.600 1.190 94 8.4 5:38 (342, 65) C/2025 T1 ( ATLAS ) It brightened up to 9.0 mag from late November to early December (Nov. 22, Thomas Lehmann). Now it is 10.7 mag (Jan. 12, Mike Olason). Fading rapidly. In the Northern Hemisphere, it will be unobservable soon. In the Southern Hemisphere, it is not observable now, but it will appear in March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 20 52.45 -5 2.9 2.063 1.272 27 11.3 18:36 ( 77, 9) Jan. 17 21 2.63 -7 35.2 2.198 1.329 21 11.8 18:41 ( 79, 3) 88P/Howell Brightening slowly. It stays extremely low. But it will become high in summer in the Northern Hemisphere, or in spring in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 17 22.94 -23 32.6 2.343 1.544 27 11.7 5:38 (302, 4) Jan. 17 17 47.42 -24 0.0 2.289 1.511 29 11.4 5:38 (303, 4) 240P/NEAT Now it is 12.1 mag (Dec. 16, Osamu Miyazaki). Fading gradually. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. The component B also brightened rapidly. Now it is bright as 14.1 mag (Dec. 20, ATLAS Chile). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 3 19.02 18 24.1 1.428 2.128 122 12.0 20:00 ( 0, 74) Jan. 17 3 21.26 20 6.0 1.503 2.133 116 12.1 19:35 ( 0, 75) 3I/2025 N1 ( ATLAS ) Third interstellar object in history following 1I/'Oumuamua and 2I/Borisov. The eccentricity is extremely big as 6. It approached to Sun down to 1.38 a.u. in late October. It brightened up to 8.9 mag in November (Nov. 12, Toshiyuki Takahashi). Now it is 12.2 mag (Jan. 11, Yoshimi Nagai). Fading rapidly. It will be fainter than 18 mag in March. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 9 3.80 14 42.8 2.026 2.947 155 12.9 1:49 ( 0, 70) Jan. 17 8 35.29 16 21.8 2.198 3.170 169 13.5 0:53 ( 0, 71) 235P/LINEAR It became brighter than expected. Now it is 13.3 mag (Dec. 22, Ken-ichi Kadota). It stays 13 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 14 55.46 -16 43.9 2.225 1.983 63 13.1 5:38 (326, 31) Jan. 17 15 10.69 -17 18.3 2.164 1.988 66 13.1 5:38 (329, 32) 29P/Schwassmann-Wachmann 1 It brightened in outburst on Dec. 5. Now it is 12.9 mag (Jan. 11, Yoshimi Nagai). It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 11 34.32 -3 32.9 5.846 6.307 113 13.8 4:18 ( 0, 51) Jan. 17 11 33.69 -3 39.7 5.745 6.307 120 13.8 3:50 ( 0, 51) C/2022 N2 ( PanSTARRS ) Now it is 14.1 mag (Jan. 3, Toru Yusa). Fading slowly. 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) Jan. 10 3 13.10 24 27.0 3.463 4.081 122 13.8 19:54 ( 0, 80) Jan. 17 3 14.93 24 21.8 3.572 4.102 116 13.9 19:29 ( 0, 79) 210P/Christensen It brightened up to 9.5 mag in late November (Nov. 28, Michael Jager, Gerald Rhemann, E. Prosperi). Now it is 13.8 mag (Jan. 6, Toru Yusa). Fading rapidly. It will be fainter than 18 mag in March. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 15 20.55 -8 32.7 1.150 1.074 59 14.2 5:38 (315, 34) Jan. 17 15 30.01 -8 30.3 1.189 1.175 64 14.8 5:38 (319, 37) C/2022 QE78 ( ATLAS ) Now it is 14.6 mag (Jan. 11, Yoshimi Nagai). It stays 15 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) Jan. 10 9 23.71 25 23.1 4.656 5.546 152 14.3 2:08 ( 0, 80) Jan. 17 9 21.67 26 10.4 4.624 5.555 159 14.3 1:38 ( 0, 81) C/2025 L1 ( ATLAS ) It is expected to brighten up to 13.5 mag and to be observable in good condition in 2026 spring. Now it is 16.0 mag (Jan. 2, Hidetaka Sato). It stays 14 mag for a while. It will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 15 51.66 -34 48.6 2.174 1.680 47 14.4 5:38 (325, 9) Jan. 17 15 55.97 -32 29.5 2.062 1.680 53 14.3 5:38 (327, 13) 78P/Gehrels 2 It will brighten up to 12 mag in 2026 summer. Now it is 16.2 mag (Dec. 28, Francois Kugel). Brightening slowly. In the Northern Hemisphere, it will be unobservable in February. In the Southern Hemisphere, it is not observable now. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 21 53.16 -8 58.2 3.097 2.401 38 14.7 18:36 ( 65, 18) Jan. 17 22 5.70 -8 1.8 3.121 2.373 34 14.6 18:41 ( 69, 15) C/2024 J3 ( ATLAS ) It will brighten up to 13 mag in 2026. Now it is 14.6 mag (Dec. 19, Kunihiro Shima). Brightening slowly. Now it is not observable. It will appear soon in the Northern Hemisphere, or in February in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 19 21.60 -3 15.8 5.660 4.739 18 14.7 5:38 (269, -7) Jan. 17 19 26.89 -2 22.9 5.621 4.706 19 14.7 5:38 (271, -2) C/2025 R2 ( SWAN ) It brightened up to 5.2 mag in October (Oct. 11, Virgilio Gonano). Now it is 14.7 mag (Jan. 9, Toru Yusa). Fading rapidly. It will be fainter than 18 mag in March. 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) Jan. 10 1 12.73 12 55.2 1.993 2.257 92 14.7 18:36 ( 26, 66) Jan. 17 1 22.32 13 39.5 2.182 2.356 87 15.1 18:41 ( 39, 64) C/2024 T5 ( ATLAS ) Now it is 14.6 mag (Jan. 4, Yukihiro Sugiyama). It stays 14 mag for a while. In the Northern Hemisphere, it will be unobservable in March. In the Southern Hemisphere, it stays observable in good condition. It is expected to brighten up to 11 mag in winter between 2026 and 2027. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 2 35.39 -39 33.5 5.527 5.595 88 14.7 19:16 ( 0, 16) Jan. 17 2 35.64 -38 20.3 5.555 5.554 84 14.7 18:49 ( 0, 17) C/2021 G2 ( ATLAS ) Now it is 14.4 mag (Oct. 11, Hiroshi Abe). It stays 15 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) Jan. 10 16 56.58 0 43.1 6.886 6.196 42 14.8 5:38 (288, 24) Jan. 17 17 1.44 1 10.8 6.847 6.227 47 14.8 5:38 (291, 29) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 14.5 mag (Dec. 24, Andrew Pearce). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. In the Northern Hemisphere, it is not observable until 2030. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 4 53.87 -74 36.4 14.501 14.370 80 14.9 21:32 ( 0,-20) Jan. 17 4 50.27 -74 22.6 14.481 14.349 80 14.9 21:01 ( 0,-19) 40P/Vaisala 1 It became brighter than expected. Now it is 14.9 mag (Dec. 27, Kunihiro Shima). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 15 40.16 -9 45.4 2.306 1.918 54 15.1 5:38 (311, 31) Jan. 17 15 56.01 -10 18.0 2.273 1.940 58 15.1 5:38 (314, 32) C/2023 R1 ( PanSTARRS ) Now it is 15.3 mag (Dec. 19, Kunihiro Shima). It stays 15 mag for a while. Now it is not observable. It will appear soon in the Northern Hemisphere, or in February in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 19 23.75 -2 20.7 4.581 3.670 19 15.3 5:38 (268, -7) Jan. 17 19 25.93 -2 38.3 4.568 3.656 19 15.2 5:38 (272, -2) C/2025 K1 ( ATLAS ) It brightened up to 9.3 mag in November (Nov. 2, Virgilio Gonano). The nucleus was split into four components. Now it is 15.4 mag (Dec. 30, Toru Yusa). Fading rapidly. It will be fainter than 18 mag in February. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 0 59.01 35 16.8 1.600 1.987 97 15.7 18:36 ( 96, 79) Jan. 17 1 2.11 33 54.1 1.828 2.096 91 16.2 18:41 ( 93, 72) C/2022 R6 ( PanSTARRS ) Now it is 16.1 mag (Jan. 12, ATLAS-MLO, Mauna Loa). It stays 16 mag for a while. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 8 51.12 -10 49.4 5.838 6.629 140 16.0 1:35 ( 0, 44) Jan. 17 8 48.69 -10 19.1 5.797 6.636 146 16.0 1:05 ( 0, 45) C/2025 R3 ( PanSTARRS ) It is expected to brighten up to 7 mag in April. Now it is 16.5 mag (Dec. 21, Alfons Diepvens). It will brighten rapidly after this. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in February. But it will be observable again in March. In the Southern Hemisphere, it is not observable now, but it will appear in May. At the high light, it is observable in the low sky before the perihelion passage in the Northern Hemisphere, or after the perihelion in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 22 12.23 19 22.7 2.321 1.989 58 16.3 18:36 ( 88, 39) Jan. 17 22 12.22 18 40.2 2.323 1.884 52 16.1 18:41 ( 92, 32) C/2025 Q3 ( ATLAS ) Now it is 15.9 mag (Jan. 12, ATLAS-MLO, Mauna Loa). It stays 17 mag for a while. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in March. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 2 3.17 -9 51.1 1.861 2.183 95 16.3 18:44 ( 0, 45) Jan. 17 2 2.67 -12 2.1 1.967 2.164 87 16.3 18:41 ( 8, 43) C/2022 E2 ( ATLAS ) It was observed at 12-13 mag for a long time in 2024. Now it is 15.9 mag (Jan. 2, ATLAS-MLO, Mauna Loa). It stays 17 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. But it will be getting higher again after March. In the Southern Hemisphere, it is not observable now, but it will appear in April. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 22 32.62 30 54.0 5.805 5.540 69 16.3 18:36 ( 99, 48) Jan. 17 22 35.02 30 12.3 5.943 5.583 64 16.4 18:41 (102, 41) C/2024 R4 ( PanSTARRS ) It brightened rapidly. It is expected to brighten up to 13.5 mag from 2027 to 2028. Now it is 16.2 mag (Jan. 4, Alfons Diepvens). It stays 16 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in spring. In the Southern Hemisphere, it is not observable now, but it will appear in April. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 21 35.85 21 20.1 7.297 6.766 54 16.3 18:36 ( 95, 32) Jan. 17 21 38.19 21 36.0 7.325 6.727 49 16.3 18:41 ( 99, 26) C/2025 J1 ( Borisov ) Now it is 16.5 mag (Jan. 10, ATLAS-MLO, Mauna Loa). 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. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 6 41.06 78 14.2 3.204 3.837 123 16.4 23:20 (180, 47) Jan. 17 5 59.75 76 19.7 3.193 3.815 122 16.3 22:12 (180, 49) 145P/Shoemaker-Levy 5 Now it is 16.4 mag (Jan. 7, ATLAS-HKO, Haleakala). It stays 17 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it will be unobservable in March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 23 52.87 -0 44.9 2.023 1.901 68 16.4 18:36 ( 45, 45) Jan. 17 0 6.09 1 19.1 2.080 1.895 65 16.4 18:41 ( 52, 43) 493P/2024 Q2 ( LONEOS ) Now it is 16.6 mag (Jan. 10, Hirohisa Sato). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in April. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 4 24.97 52 22.3 3.070 3.823 134 16.5 21:06 (180, 73) Jan. 17 4 23.08 51 46.9 3.127 3.823 129 16.5 20:37 (180, 73) 164P/Christensen Now it is 17.0 mag (Jan. 11, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in April. 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) Jan. 10 11 27.58 23 52.4 1.939 2.623 124 16.5 4:11 ( 0, 79) Jan. 17 11 26.85 24 58.8 1.911 2.663 131 16.5 3:43 ( 0, 80) 261P/Larson Now it is 16.4 mag (Jan. 5, WFST, Lenghu). Fading slowly. It will be fainter than 18 mag in April. It will be unobservable in February in the Southern Hemisphere, or in March in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 22 43.55 -2 57.6 2.468 2.017 52 16.6 18:36 ( 60, 32) Jan. 17 22 58.27 -1 29.1 2.527 2.021 48 16.7 18:41 ( 65, 29) C/2024 A1 ( ATLAS ) Now it is 16.8 mag (Jan. 7, W. Hasubick). Fading slowly. It will be fainter than 18 mag in May. In the Northern Hemisphere, it stays observable in good condition. 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) Jan. 10 8 3.67 58 24.9 3.458 4.284 142 16.6 0:49 (180, 67) Jan. 17 7 49.65 60 0.9 3.502 4.309 140 16.7 0:08 (180, 65) 43P/Wolf-Harrington Now it is 16.5 mag (Jan. 11, ATLAS-MLO, Mauna Loa). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 11 15.38 -8 9.5 2.113 2.691 115 16.7 3:59 ( 0, 47) Jan. 17 11 15.92 -8 41.6 2.055 2.711 122 16.7 3:32 ( 0, 46) 195P/Hill Now it is 17.4 mag (Jan. 11, 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) Jan. 10 9 54.83 -32 32.6 3.999 4.498 114 16.7 2:38 ( 0, 22) Jan. 17 9 52.33 -33 10.6 3.942 4.503 119 16.7 2:08 ( 0, 22) C/2023 F3 ( ATLAS ) Now it is 16.9 mag (Jan. 8, ATLAS-HKO, Haleakala). 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) Jan. 10 10 36.60 -24 38.6 5.317 5.786 113 16.8 3:20 ( 0, 30) Jan. 17 10 30.19 -24 21.4 5.241 5.809 120 16.7 2:46 ( 0, 30) 93P/Lovas 1 Now it is 17.2 mag (Jan. 4, Alfons Diepvens). Brightening slowly. It will be unobservable soon in the Southern Hemisphere, or in March in the Northern Hemisphere. It will brighten up to 15.5 mag in spring. But it is not observable around the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 22 29.48 -6 11.7 2.568 2.036 47 16.9 18:36 ( 60, 27) Jan. 17 22 42.43 -4 31.4 2.587 1.999 43 16.8 18:41 ( 65, 24) C/2023 H5 ( Lemmon ) Now it is 16.6 mag (Dec. 26, Kunihiro Shima). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. 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) Jan. 10 18 50.47 62 5.3 4.589 4.598 84 16.8 5:38 (213, 31) Jan. 17 19 9.80 61 51.7 4.631 4.618 83 16.9 5:38 (214, 32) C/2023 C2 ( ATLAS ) It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 16.9 mag (Jan. 12, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in April. In the Northern Hemisphere, it will be getting lower gradually. 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) Jan. 10 23 1.80 48 8.3 4.870 4.890 85 16.8 18:36 (126, 56) Jan. 17 23 9.52 47 58.1 4.994 4.945 81 16.9 18:41 (125, 51) C/2023 X2 ( Lemmon ) Now it is 17.0 mag (Nov. 29, Ken-ichi Kadota). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. 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) Jan. 10 19 14.55 82 56.2 4.746 5.089 104 16.9 5:38 (188, 34) Jan. 17 19 38.79 82 21.6 4.775 5.091 103 16.9 5:38 (189, 34) C/2024 G6 ( ATLAS ) Now it is 17.0 mag (July 25, Ken-ichi Kadota). 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) Jan. 10 16 30.09 -6 14.3 7.096 6.436 44 16.9 5:38 (298, 25) Jan. 17 16 32.19 -5 38.9 7.005 6.434 51 16.9 5:38 (302, 30) (306173) 2010 NK83 Peculiar asteroid moving along a cometary orbit. Now it is 17.3 mag (Jan. 5, Guy Wells). Fading gradually. It will be fainter than 18 mag in February. 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) Jan. 10 7 56.29 24 11.8 1.604 2.582 172 17.0 0:41 ( 0, 79) Jan. 17 7 51.82 25 1.7 1.618 2.600 175 16.9 0:09 ( 0, 80) C/2023 RS61 ( PanSTARRS ) Although it is around 20 mag usually, now it is bright in outburst. Now it is 17.5 mag (Jan. 7, W. Hasubick). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 2 42.22 36 36.2 8.257 8.765 118 17.0 19:23 (180, 88) Jan. 17 2 42.16 36 23.0 8.346 8.756 111 17.0 18:56 (180, 89) 123P/West-Hartley It will brighten up to 15 mag from autumn to winter in 2026. Now it is 17.7 mag (Jan. 7, Hirohisa Sato). It stays 17 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) Jan. 10 3 19.52 27 23.0 2.174 2.851 124 17.1 20:01 ( 0, 82) Jan. 17 3 18.85 27 30.2 2.227 2.822 117 17.1 19:32 ( 0, 83) 47P/Ashbrook-Jackson Now it is 16.9 mag (Jan. 4, Alfons Diepvens). Fading slowly. It will be fainter than 18 mag in April. It will be unobservable in February in the Southern Hemisphere, or in March in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 23 32.36 0 27.3 3.121 2.840 64 17.1 18:36 ( 52, 42) Jan. 17 23 40.91 1 37.9 3.211 2.846 59 17.2 18:41 ( 59, 39) 218P/LINEAR It will brighten up to 16 mag in spring. Now it is 17.0 mag (Dec. 29, Hidenori Nohara). Brightening slowly. It locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 14 59.54 -16 30.9 1.443 1.313 62 17.4 5:38 (325, 31) Jan. 17 15 29.08 -18 11.2 1.390 1.272 62 17.1 5:38 (325, 29) C/2019 E3 ( ATLAS ) Very far object. Now it is 16.6 mag (Oct. 19, 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 March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 0 5.12 -50 5.2 11.575 11.128 60 17.3 18:36 ( 17, 2) Jan. 17 0 5.84 -49 22.4 11.650 11.142 56 17.3 18:41 ( 22, 0) C/2024 G2 ( ATLAS ) Now it is 17.3 mag (Jan. 11, ATLAS-MLO, Mauna Loa). 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) Jan. 10 12 9.30 -9 3.0 5.257 5.569 103 17.6 4:53 ( 0, 46) Jan. 17 12 6.93 -8 15.7 5.148 5.584 111 17.5 4:23 ( 0, 47) 217P/LINEAR It brightened up to 12.1 mag in early summer (June 10, Taras Prystavski). Now it is 17.7 mag (Dec. 30, Taras Prystavski). Fading gradually. It will be fainter than 18 mag in February. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 8 57.03 16 48.3 1.845 2.779 157 17.5 1:41 ( 0, 72) Jan. 17 8 49.78 17 44.2 1.866 2.832 166 17.7 1:07 ( 0, 73) 302P/Lemmon-PanSTARRS It brightened very rapidly, and it became brighter than expected. Now it is 17.1 mag (Dec. 26, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in February. 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) Jan. 10 0 37.64 -2 19.5 3.620 3.555 78 17.5 18:36 ( 30, 49) Jan. 17 0 43.08 -1 35.4 3.730 3.566 72 17.6 18:41 ( 39, 46) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 17.9 mag (Jan. 11, ATLAS-HKO, Haleakala). 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) Jan. 10 5 43.30 30 57.0 9.450 10.355 155 17.6 22:24 ( 0, 86) Jan. 17 5 40.30 31 0.9 9.553 10.404 148 17.6 21:53 ( 0, 86) P/2023 S1 ( PanSTARRS ) It brightened up to 13.7 mag in last winter (Jan. 4, 2025, W. Pei). It stays 18 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) Jan. 10 14 51.13 -24 44.3 3.521 3.180 61 17.8 5:38 (331, 24) Jan. 17 14 58.81 -25 32.4 3.451 3.200 67 17.8 5:38 (336, 25) C/2019 U5 ( PanSTARRS ) Now it is 17.8 mag (Dec. 28, Jean-Claude Merlin). It stays 18 mag for a while. 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) Jan. 10 4 39.59 -46 32.8 8.651 8.907 102 17.8 21:19 ( 0, 9) Jan. 17 4 34.95 -45 59.2 8.738 8.951 99 17.8 20:47 ( 0, 9) 276P/Vorobjov Now it is 17.4 mag (Dec. 28, Jean-Claude Merlin). Fading slowly. It will be fainter than 18 mag in February. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 6 45.15 4 44.5 3.330 4.269 160 17.8 23:25 ( 0, 60) Jan. 17 6 41.26 4 51.9 3.362 4.281 156 17.8 22:54 ( 0, 60) C/2024 X2 ( ATLAS ) Now it is 17.5 mag (Dec. 26, Hidenori Nohara). Fading slowly. It will be fainter than 18 mag in February. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 8 41.00 5 26.1 3.094 4.007 155 17.8 1:25 ( 0, 60) Jan. 17 8 31.76 7 21.5 3.077 4.031 163 17.8 0:49 ( 0, 62) 489P/Denning It had been lost for 113 years. It passed the perihelion on Dec. 4. It brightened up to 18 mag in outburst in 2007. Brightening slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Jan. 10 12 45.68 -0 21.7 1.139 1.614 98 21.8 5:29 ( 0, 55) Jan. 17 12 56.83 -1 40.7 1.106 1.635 102 21.8 5:12 ( 0, 53)