Weekly Information about Bright Comets (2021 Feb. 27: North)

Japanese version Home page	Updated on March 3, 2021
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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.

P/1999 J6 = P/2004 V9 = P/2010 H3 ( SOHO ) Marsden group's comet. Three apparitions of this comet was confirmed in 1999, 2004 and 2010. It will approach to Sun down to 0.044 a.u. on Feb. 28. After the perihelion passage, it may be observed on the ground from March to April. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 22 51.67 -9 32.9 1.081 0.107 3 9.6 19:17 ( 90,-16) Mar. 6 21 55.80 -10 21.8 0.963 0.307 17 16.2 4:59 (278, -6) SWAN21D New bright comet. Now it is very bright as 10.5 mag (Feb. 28, Michael Jager). In the Northern Hemisphere, it stays observable in the evening low sky until early June while the comet will be fading. In the Southern Hemisphere, it will be observable only in the extremely low sky from May to June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 23 22.74 12 20.2 1.697 0.881 23 10.6 19:17 (104, 3) Mar. 6 23 55.37 17 9.0 1.651 0.875 25 10.5 19:23 (108, 6) C/2020 R4 ( ATLAS ) It brightened rapidly in December. Now it is bright as 11.4 mag (Feb. 27, Ken-ichi Kadota). It will approach to Earth down to 0.46 a.u. in April, and it is expected to brighten up to 9 mag and to be observable in excellent condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 20 41.52 -11 59.6 1.772 1.030 29 10.9 5:08 (287, 4) Mar. 6 20 35.31 -10 40.9 1.621 1.031 37 10.7 4:59 (290, 9) 10P/Tempel 2 It will brighten up to 11.5 mag in spring. However, the condition is very bad in this apparition. It will appear in the morning low sky in March in the Southern Hemisphere, or in June in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 20 59.76 -16 41.3 2.264 1.438 25 11.9 5:08 (289, -2) Mar. 6 21 23.74 -15 35.9 2.237 1.426 26 11.7 4:59 (287, -3) C/2021 A2 ( NEOWISE ) It brightened up to 10.5 mag in early February (Feb. 6, Marco Goiato). Now it is fading. In the Northern Hemisphere, it stays observable in excellent condition after this. In the Southern Heimsphere, it will be unobservable in mid March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 5 27.99 34 22.2 0.906 1.502 104 12.1 19:17 ( 88, 86) Mar. 6 5 13.87 39 22.8 1.090 1.539 95 12.6 19:23 (114, 76) C/2019 N1 ( ATLAS ) Now it is bright as 12.9 mag (Feb. 9, Chris Wyatt). It stays 12 mag until March. In the Southern Hemisphere, it stays observable in good condition after this. In the Northern Hemisphere, it will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 20 9.40 -88 21.7 1.965 2.046 80 12.1 5:08 (358,-34) Mar. 6 2 18.65 -85 0.6 2.009 2.095 80 12.2 19:23 ( 6,-32) C/2019 L3 ( ATLAS ) Now it is 12.4 mag (Feb. 8, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 10 mag in winter in 2022. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 1 23.59 52 7.2 4.783 4.540 69 13.1 19:17 (132, 41) Mar. 6 1 34.91 51 49.5 4.818 4.503 65 13.1 19:23 (132, 38) C/2020 S3 ( Erasmus ) It brightened up to 5.6 mag in early December (Dec. 9, Marco Goiato). In mid December, it was visible at about 3 mag in the SOHO spacecraft images (Dec. 18, Hirohisa Sato). Now it is not observable. It will appear in the morning sky again in April. But then it will be fainter than 15 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 22 16.76 1 44.1 2.627 1.669 11 13.3 5:08 (263, -7) Mar. 6 22 30.84 3 15.5 2.737 1.782 12 13.7 4:59 (262, -6) 156P/Russell-LINEAR Brightened rapidly, and it brightened up to 9.7 mag in November (Nov. 15, Chris Wyatt). Now it is fading. But it is bright as 12.0 mag still now (Feb. 9, Chris Wyatt). In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it locates extremely low after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 4 2.32 40 14.4 1.468 1.747 88 13.4 19:17 (112, 69) Mar. 6 4 24.13 40 39.6 1.568 1.795 85 13.7 19:23 (113, 67) C/2019 F1 ( ATLAS-Africano ) It will brighten up to 13 mag from spring to summer. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until July in 2022. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 17 58.59 -58 37.5 3.921 3.746 72 13.7 5:08 (342, -8) Mar. 6 18 12.40 -60 15.4 3.828 3.729 76 13.6 4:59 (343, -9) C/2017 K2 ( PanSTARRS ) Now it is 14.2 mag (Feb. 8, Toshihiko Ikemura, Hirohisa Sato). It is expected to be observable at 5-6 mag for a long time from 2022 to 2023. In the Northern Hemisphere, it is not observable at the high light from 2022 summer to 2023 summer. In the Southern Hemisphere, it stays extremely low for a while. But it will be observable in good condition at the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 18 22.22 36 43.0 7.177 6.991 75 13.7 5:08 (255, 56) Mar. 6 18 24.43 37 12.9 7.070 6.935 78 13.7 4:59 (255, 60) 29P/Schwassmann-Wachmann 1 Now it is 13.9 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). In the Southern Hemisphere, it will be unobservable in late February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 2 31.98 24 7.5 6.205 5.861 65 13.7 19:17 ( 89, 47) Mar. 6 2 36.21 24 17.1 6.306 5.862 59 13.8 19:23 ( 93, 41) C/2021 A4 ( NEOWISE ) It brightening very rapidly up to 12.5 mag in early February (Feb. 8, Michael Jager). Now it is fading. In the Northern Hemisphere, it stays observable in excellent condition. It will be observable in good condition after this also in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 4 36.90 19 19.6 0.630 1.193 92 13.8 19:17 ( 48, 67) Mar. 6 4 24.33 9 7.7 0.796 1.167 80 14.0 19:23 ( 52, 53) 88P/Howell It brightened up to 8.2 mag in autumn (Oct. 13, Chris Wyatt). Now it is fading. It has already faded down to 13.0 mag (Feb. 14, Sandor Szabo). In the Southern Hemisphere, it is already unobservable. In the Northern Hemisphere, it will be unobservable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 0 28.55 1 2.9 2.880 2.067 28 13.8 19:17 ( 85, 10) Mar. 6 0 42.73 2 41.2 2.965 2.114 25 14.1 19:23 ( 89, 7) C/2020 M3 ( ATLAS ) It brightened up to 7.3 mag in November (Nov. 7, Marco Goiato). Now it is fading. It has already faded down to 15.1 mag (Feb. 14, Thomas Lehmann). In the Northern Hemisphere, it stays observable in excellent condition for a long time. In the Southern Hemisphere, it stays locating extremely low after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 6 10.75 47 41.9 1.585 2.154 111 14.0 19:43 (180, 77) Mar. 6 6 22.24 47 11.1 1.722 2.226 107 14.4 19:27 (180, 78) C/2020 T2 ( Palomar ) Now it is 14.2 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 12.5 mag from spring to summer, and it stays observable in good condition for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 14 4.08 30 47.7 1.860 2.586 127 14.2 3:37 ( 0, 86) Mar. 6 14 6.46 31 43.1 1.779 2.539 130 14.0 3:12 ( 0, 87) 246P/NEAT Now it is 15.5 mag (Jan. 19, Slooh.com Chile Observatory, La Dehesa). It stays 13-14 mag from 2020 to 2021. It will be observable in good condition after this in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 18 18.36 -22 41.2 3.155 2.864 64 14.1 5:08 (320, 21) Mar. 6 18 28.28 -22 59.4 3.069 2.865 68 14.0 4:59 (322, 21) C/2020 J1 ( SONEAR ) Now it is 14.4 mag (Jan. 20, iTelescope Observatory, Siding Spring). It will brighten up to 13.5 mag in spring. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it will be getting higher and becoming observable slowly. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 17 48.21 -40 6.4 3.570 3.389 71 14.6 5:08 (335, 9) Mar. 6 17 44.73 -39 53.7 3.428 3.380 78 14.5 4:59 (339, 11) C/2019 T4 ( ATLAS ) Now it is 14.2 mag and visible visually (Jan. 25, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. It is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it is observable from autumn to winter, but it locating extremely low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 8 2.12 -38 14.7 5.116 5.684 120 14.6 21:32 ( 0, 17) Mar. 6 8 0.41 -37 24.2 5.101 5.648 118 14.6 21:03 ( 0, 18) 398P/2020 P2 ( Boattini ) First return of a new periodic comet which brightened up to 13 mag in 2009. It brightened up to 11.7 mag in January (Jan. 10, Marco Goiato). Now it is fading. It has already faded down to 14.7 mag (Feb. 14, Thomas Lehmann). It stays observable in good condition while the comet will be fading after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 6 46.94 26 7.3 0.695 1.482 122 14.6 20:19 ( 0, 81) Mar. 6 7 5.20 27 9.9 0.766 1.519 119 15.1 20:10 ( 0, 82) C/2018 U1 ( Lemmon ) Now it is 15.9 mag (Nov. 10, Toshihiko Ikemura, Hirohisa Sato). It will stay at 14 mag for a long time from 2021 to 2022. It stays observable in good condition after this while brightening gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 18 22.05 2 33.4 5.684 5.345 65 15.0 5:08 (300, 39) Mar. 6 18 23.07 2 23.5 5.564 5.326 71 14.9 4:59 (305, 42) P/2020 U2 ( PanSTARRS ) Brightened very rapidly. Now it is 15.0 mag (Feb. 4, Michael Jager). It stays observable at 15-16 mag in good condition for a while. It locates low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 4 12.58 27 56.1 1.696 1.934 88 15.1 19:17 ( 77, 69) Mar. 6 4 28.37 28 6.4 1.780 1.953 84 15.0 19:23 ( 81, 66) 17P/Holmes Now it is 15.8 mag (Jan. 16, Slooh.com Canary Islands Observatory). It is not observable until June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 23 6.68 0 39.2 3.043 2.081 11 15.1 19:17 ( 96, -7) Mar. 6 23 20.73 2 42.8 3.056 2.083 9 15.1 19:23 (101,-10) C/2017 T2 ( PanSTARRS ) It had been observed as 8-9 mag for a long time in 2020. Now it is fading. It has already faded down to 16.6 mag (Jan. 23, Slooh.com Chile Observatory, La Dehesa). It will be observable in good condition after this in the Southern Hemisphere. It locates extremely low after this in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 17 40.13 -33 57.3 4.101 3.924 72 15.1 5:08 (333, 15) Mar. 6 17 43.20 -34 55.3 4.057 3.990 79 15.1 4:59 (337, 16) 141P/Machholz 2 It brightened very rapidly in early December, and it brightened up to 10.0 mag in January (Jan. 7, Michael Jager). Now it is fading. It has already faded down to 13.3 mag (Feb. 9, Chris Wyatt). Two more components, H and I, are also observed. It stays observable for a long time in this apparition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 5 3.13 2 33.5 0.837 1.363 96 15.1 19:17 ( 19, 56) Mar. 6 5 30.13 3 34.5 0.937 1.438 96 16.0 19:23 ( 22, 57) C/2020 F5 ( MASTER ) Now it is 15.8 mag (Jan. 14, Slooh.com Chile Observatory, La Dehesa). It stays 14-15 mag until the end of 2021. In the Southern Hemisphere, it stays observable in good condition for a long time, although it becomes extremely low temporarily from January to February. In the Northern Hemisphere, it is not observable until June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 22 13.23 -45 53.5 5.070 4.331 37 15.2 5:08 (307,-30) Mar. 6 22 22.54 -44 45.5 5.040 4.329 40 15.2 4:59 (307,-28) C/2020 K5 ( PanSTARRS ) It will brighten up to 13 mag from spring to summer. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it locates extremely low now, and it will be unobservable soon. Then it is not observable until September when it fades down to 15 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 19 37.71 -29 9.0 2.568 2.033 47 15.6 5:08 (310, 4) Mar. 6 19 55.15 -30 54.0 2.438 1.975 51 15.4 4:59 (312, 3) C/2019 T2 ( Lemmon ) Now it is 16.3 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 14.5 mag from spring to summer. In the Southern Hemisphere, it stays observable in excellent condition for a long time, although it becomes extremely low temporarily from January to February. In the Northern Hemisphere, it is not observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 22 33.65 -40 22.4 3.496 2.707 31 15.5 5:08 (300,-32) Mar. 6 22 43.81 -41 24.5 3.432 2.693 35 15.4 4:59 (301,-31) 409P/2020 V1 ( LONEOS-Hill ) First return of a new periodic comet which brightened up to 14-15 mag in 2006. Now it is 15.5 mag (Feb. 8, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15-16 mag from February to March, and will be observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 13 13.42 11 32.5 0.896 1.784 142 15.4 2:47 ( 0, 66) Mar. 6 13 17.58 13 38.6 0.886 1.799 146 15.5 2:23 ( 0, 68) C/2020 N1 ( PanSTARRS ) Now it is 15.7 mag (Feb. 14, Thomas Lehmann). It stays 15-16 mag until spring. In the Northern Hemisphere, it stays observable in excellent condition. In the Southern Hemisphere, it stays extremely low until spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 3 8.79 20 33.3 1.250 1.335 72 15.5 19:17 ( 77, 53) Mar. 6 3 34.96 18 42.5 1.266 1.324 70 15.6 19:23 ( 76, 50) 7P/Pons-Winnecke Now it is 18.1 mag, much fainter than predicted (Feb. 8, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 11 mag from May to August. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it stays observable in good condition for a while. But it becomes extremely low after July. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 16 16.99 9 46.5 1.172 1.624 97 15.8 5:08 (337, 63) Mar. 6 16 35.81 9 44.9 1.087 1.575 98 15.5 4:59 (337, 63) C/2019 K7 ( Smith ) Now it is 15.5 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag until spring. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will be observable in the extremely low sky only in next spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 19 18.37 31 43.0 5.301 4.925 62 15.6 5:08 (257, 44) Mar. 6 19 20.21 33 20.9 5.265 4.948 66 15.6 4:59 (257, 48) 28P/Neujmin 1 Now it is not observable. It will be observable in June. But it will fade down to 17 mag at that time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 22 15.40 -14 12.1 2.559 1.586 8 15.7 5:08 (276,-16) Mar. 6 22 35.31 -11 35.0 2.550 1.580 9 15.7 4:59 (274,-15) 117P/Helin-Roman-Alu 1 Now it is 15.5 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2022. In 2021, it is observable at 15-16 mag in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 13 44.66 -2 37.6 3.041 3.782 132 15.8 3:18 ( 0, 52) Mar. 6 13 43.06 -2 24.1 2.952 3.766 139 15.7 2:49 ( 0, 52) C/2021 A7 ( NEOWISE ) Now it is 16.5 mag (Feb. 5, Thomas Lehmann). It brightens up to 15 mag from spring to summer. In the Southern Hemisphere, it stays observable in good condition until June. In the Northern Hemisphere, it is observable in the low sky from March to May. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 5 55.86 -51 59.9 2.291 2.570 94 15.9 19:26 ( 0, 3) Mar. 6 5 59.16 -48 24.0 2.241 2.519 94 15.8 19:23 ( 4, 7) C/2018 N2 ( ASASSN ) Now it is 14.9 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable for a long time while it is getting fainter slowly. In the Southern Hemisphere, it will never be observable again. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 16 32.30 65 43.9 5.113 5.349 98 15.9 5:08 (191, 58) Mar. 6 16 26.81 66 37.1 5.149 5.397 99 15.9 4:59 (186, 58) C/2020 M5 ( ATLAS ) Now it is 16.4 mag (Jan. 17, D. Buczynski). In the Northern Hemisphere, it stays observable at 15 mag for a long time from spring to early 2022. In the Southern Hemisphere, it is not observable until the end of 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 20 12.15 51 44.6 3.700 3.454 68 16.4 5:08 (228, 39) Mar. 6 20 15.26 53 39.7 3.643 3.421 69 16.3 4:59 (226, 42) C/2020 Y2 ( ATLAS ) Now it is 17.0 mag (Feb. 6, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 13 mag in 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it stays observable until June when it brightens up to 16 mag. But it will not be observable at the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 13 58.69 -18 57.6 4.742 5.357 123 16.7 3:32 ( 0, 36) Mar. 6 13 53.73 -19 24.5 4.598 5.310 131 16.6 3:00 ( 0, 36) P/2020 T3 ( PanSTARRS ) It brightened very rapidly up to 16.5 mag in January (Jan. 2, D. Buczynski). However, it is fading very rapidly in February. It has already faded down to 18.3 mag (Feb. 11, Toshihiko Ikemura, Hirohisa Sato). It is observable in excellent condition in the Northern Hemisphere. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 3 34.51 22 34.7 1.335 1.494 78 16.6 19:17 ( 75, 59) Mar. 6 3 57.30 24 15.1 1.394 1.517 76 16.7 19:23 ( 80, 58) 277P/LINEAR It brightened rapidly and became brighter than expected. Now it is 16.7 mag (Feb. 7, Toshihiko Ikemura, Hirohisa Sato). It is observable in good condition in the Northern Hemisphere. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 4 12.23 21 32.8 1.764 1.974 86 16.6 19:17 ( 63, 66) Mar. 6 4 26.72 21 10.3 1.851 1.991 82 16.8 19:23 ( 68, 62) C/2020 H6 ( ATLAS ) Now it is 16.8 mag (Feb. 6, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 16-17 mag from 2021 to 2022. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 14 29.35 -23 57.6 4.498 5.003 115 16.8 4:03 ( 0, 31) Mar. 6 14 28.05 -23 4.7 4.376 4.984 122 16.7 3:34 ( 0, 32) C/2017 Y2 ( PanSTARRS ) Now it is 16.3 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). It is observable at 16.5 mag from spring in 2020 to summer in 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 17 52.02 -11 17.9 4.954 4.721 70 16.7 5:08 (318, 33) Mar. 6 17 51.14 -11 41.3 4.841 4.732 77 16.7 4:59 (324, 36) C/2019 O3 ( Palomar ) Now it is 16.6 mag (Nov. 9, Toshihiko Ikemura, Hirohisa Sato). It stays at 16-17 mag from 2020 to 2021. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 19 39.73 34 56.1 9.261 8.820 60 16.7 5:08 (251, 41) Mar. 6 19 41.85 35 47.8 9.220 8.819 63 16.7 4:59 (252, 44) C/2017 U7 ( PanSTARRS ) Now it is 16.3 mag (Oct. 17, ATLAS-MLO, Mauna Loa). It will be fading slowly. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 18 28.73 -18 46.0 7.767 7.347 61 17.0 5:08 (315, 22) Mar. 6 18 28.79 -18 25.9 7.674 7.370 68 17.0 4:59 (319, 25) C/2020 O2 ( Amaral ) Now it is 17.7 mag (Sept. 14, Slooh.com Chile Observatory, La Dehesa). It will brighten up to 16.5 mag in summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 17 30.27 -35 2.4 5.234 5.066 74 17.1 5:08 (336, 15) Mar. 6 17 33.14 -34 32.4 5.108 5.052 81 17.1 4:59 (339, 17) 402P/2020 Q3 ( LINEAR ) First return of a new periodic comet which brightened up to 16 mag from 2003 to 2004. Now it is 17.6 mag (Feb. 7, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag in next winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 2 54.83 -11 46.7 4.628 4.266 62 17.2 19:17 ( 49, 28) Mar. 6 3 0.14 -10 40.9 4.692 4.252 58 17.2 19:23 ( 56, 24) 162P/Siding Spring Now it is 16.0 mag (Feb. 7, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and will be fainter than 18 mag in April. In the Northern Hemisphere, it stays observable in good condition for a long time after this. In the Southern Hemisphere, it will never be unobservable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 2 21.10 37 21.6 1.632 1.577 69 17.2 19:17 (109, 49) Mar. 6 2 44.39 39 28.5 1.713 1.620 67 17.3 19:23 (113, 48) A/2019 U5 Now it is 17.3 mag (Feb. 8, Toshihiko Ikemura, Hirohisa Sato). Although it is an asteroid, it is brightening rapidly. It may brighten up to 11 mag in 2023. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable now. It will appear in mid March, but it stays extremely low after that. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 18 35.75 40 4.8 7.489 7.282 74 17.3 5:08 (248, 54) Mar. 6 18 36.43 40 50.3 7.394 7.237 77 17.2 4:59 (247, 58) C/2020 R7 ( ATLAS ) Now it is 18.2 mag (Feb. 2, Thomas Lehmann). It is expected to brighten up to 12 mag in 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until 2022 autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 2 41.97 -45 4.7 6.353 5.976 63 17.3 19:17 ( 31, 0) Mar. 6 2 42.73 -44 28.2 6.345 5.926 60 17.2 19:23 ( 36, -3) C/2020 Y3 ( ATLAS ) Now it is 17.0 mag (Feb. 15, Michael Jager). It stays 17.5 mag and observable in good condition until March. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 15 0.20 13 30.7 1.627 2.246 116 17.3 4:33 ( 0, 68) Mar. 6 14 59.90 19 4.3 1.602 2.284 121 17.3 4:05 ( 0, 74) 413P/2020 W4 ( Larson ) First return of a new periodic comet which brightened up to 16 mag in 2014. Now it is 18.3 mag (Feb. 14, Michael Jager). It will brighten up to 17 mag in spring, and it will be observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 12 59.87 12 40.9 1.510 2.392 145 17.6 2:33 ( 0, 68) Mar. 6 12 56.78 12 51.3 1.449 2.370 151 17.4 2:03 ( 0, 68) C/2019 C1 ( ATLAS ) It brightened up to 16.1 mag in last winter (Mar. 18, 2020, Toshihiko Ikemura, Hirohisa Sato). Now it is 17.6 mag (Feb. 9, Toshihiko Ikemura, Hirohisa Sato). In 2021, it stays observable at 17-18 mag in good condition until early summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 13 13.78 -19 46.5 6.161 6.872 132 17.5 2:47 ( 0, 35) Mar. 6 13 12.70 -19 27.1 6.097 6.885 139 17.5 2:19 ( 0, 35) 99P/Kowal 1 Now it is 18.0 mag (Feb. 6, Toshihiko Ikemura, Hirohisa Sato). It stays 17-18 mag for a long time from 2021 to 2023. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 10 57.31 11 0.2 3.961 4.948 174 17.6 0:31 ( 0, 66) Mar. 6 10 53.82 11 18.8 3.953 4.940 173 17.6 0:00 ( 0, 66) C/2020 V2 ( ZTF ) Now it is 17.2 mag (Feb. 8, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 10 mag in 2023. In the Northern Hemisphere, it stays observable in good condition until 2023 autumn. In the Southern Hemipshere, it stays extremely low until mid July, then it becomes unobservable for a while. But it becomes observable in good condition after 2023 summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 13 8.11 33 28.7 7.102 7.863 137 17.7 2:42 ( 0, 88) Mar. 6 13 4.26 34 21.3 7.020 7.811 140 17.7 2:10 ( 0, 89) A/2020 F7 Now it is 17.0 mag (Feb. 7, Toshihiko Ikemura, Hirohisa Sato). Although it is an asteroid, it is brightening rapidly. It stays 17-18 mag for a long time from 2021 to 2022. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is observable only until May. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 8 48.23 -6 34.3 4.800 5.667 148 17.7 22:18 ( 0, 48) Mar. 6 8 42.13 -6 43.7 4.835 5.650 141 17.7 21:44 ( 0, 48) C/2020 S8 ( Lemmon ) Now it is 18.0 mag (Feb. 8, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 17 mag from April to May, and it will be observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 16 43.91 16 7.8 2.175 2.412 91 18.0 5:08 (316, 66) Mar. 6 16 36.12 16 12.2 2.037 2.397 98 17.8 4:59 (330, 69) C/2019 E3 ( ATLAS ) It stays 17-18 mag for a long time until 2026. In the Southern Hemisphere, it stays sobservable in good condition for a long time. It is not observable in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 9 18.41 -57 23.3 11.166 11.575 112 17.9 22:48 ( 0, -2) Mar. 6 9 13.42 -57 18.1 11.136 11.558 112 17.9 22:15 ( 0, -2) C/2021 A1 ( Leonard ) Now it is 18.0 mag (Feb. 9, Katsumi Yoshimoto). It will approach to Earth down to 0.2 a.u. in December, and it is expected to brighten up to 4 mag. In the Northern Hemisphere, it stays observable in good condition for a long time until December while the comet is brightening gradually. In the Southern Hemisphere, it is not observable until mid December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 13 49.94 53 22.4 3.917 4.509 121 18.0 3:23 (180, 72) Mar. 6 13 41.20 55 12.0 3.832 4.434 121 17.9 2:47 (180, 70) C/2020 F2 ( ATLAS ) It stays observable at 18 mag for a long time until 2024. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 15 35.53 -12 44.1 9.004 9.286 103 18.0 5:08 ( 0, 42) Mar. 6 15 33.52 -12 25.8 8.870 9.274 111 17.9 4:39 ( 0, 42) 414P/2021 A3 ( STEREO ) New periodic comet discovered in 2016. It had been predicted to return in 2024. But actually, it returned much earlier than predicted. It brightened very rapidly up to 11 mag in January (Jan. 16, Giuseppe Pappa). Now it is fading very rapidly. It has already faded out, fainter than 19.5 mag (Feb. 21, Katsumi Yoshimoto). In the Southern Hemisphere, it stays observable in excellent condition after this. In the Northern Hemisphere, it will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 19 36.76 -52 21.8 0.615 0.839 57 18.9 5:08 (327,-12) Mar. 6 19 16.80 -52 33.1 0.648 0.939 66 21.0 4:59 (331, -8) 323P/SOHO Five apparitions of this comet was confirmed in 1999, 2004, 2008, 2012 and 2016. It approached to Sun down to 0.04 a.u. on Jan. 17. It may be observed on the ground in December and February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Feb. 27 3 59.41 23 37.3 0.755 1.183 84 20.1 19:17 ( 71, 65) Mar. 6 4 37.38 24 40.5 0.934 1.313 85 21.0 19:23 ( 72, 66)