Weekly Information about Bright Comets (2021 Sept. 25: North)

Japanese version Home page	Updated on September 29, 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.

8P/Tuttle It brightened very rapidly. Now it is very bright as 8.9 mag (Sept. 11, Chris Wyatt). It stays bright as 8-9 mag until October. The condition is bad in this apparition. In the Southern Hemisphere, it stays observable after this while the comet will be fading. But it stays locating low. It is not observable after this in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 10 15.20 -17 9.5 1.828 1.113 31 8.5 4:25 (288, -5) Oct. 2 10 39.55 -22 24.3 1.857 1.157 33 8.7 4:31 (293, -6) 4P/Faye Now it is bright as 10.7 mag (Sept. 16, Osamu Miyazaki). It stays observable at 10-11 mag in excellent condition from summer to autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 5 49.21 16 58.3 1.207 1.627 94 10.3 4:25 (315, 66) Oct. 2 6 3.99 16 6.2 1.167 1.636 97 10.3 4:31 (326, 68) 67P/Churyumov-Gerasimenko Now it is bright as 11.3 mag (Sept. 19, Seiichi Yoshida). It will brighten up to 9 mag, and will be observable in good condition in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 4 32.89 19 53.1 0.531 1.300 112 10.7 4:17 ( 0, 75) Oct. 2 5 3.35 21 41.1 0.495 1.272 111 10.4 4:20 ( 0, 77) 6P/d'Arrest Now it is bright as 11.5 mag (Sept. 10, Thomas Lehmann). It will brighten very rapidly, and it will be observable at 10 mag in good condition from October to December. In the Northern Hemisphere, it locates somewhat low at the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 18 21.88 -25 20.3 0.862 1.357 93 10.9 19:17 ( 18, 27) Oct. 2 18 47.20 -27 43.0 0.898 1.365 91 10.6 19:06 ( 15, 25) C/2019 L3 ( ATLAS ) Now it is 10.8 mag (Sept. 16, Osamu Miyazaki). It will brighten up to 10 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it locates extremely low until November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 7 24.54 43 36.9 3.786 3.685 76 10.9 4:25 (242, 57) Oct. 2 7 30.87 43 2.4 3.676 3.668 81 10.8 4:31 (243, 62) C/2021 O1 ( Nishimura ) It was observed at 9-10 mag from late July to early August. Now it is not observable. It will appear in the morning sky in December, but it will be fainter than 15 mag at that time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 12 27.22 6 59.2 2.091 1.113 9 11.1 19:17 (105, -9) Oct. 2 12 49.61 3 28.0 2.185 1.203 8 11.5 19:06 (101,-10) C/2020 T2 ( Palomar ) Now it is very bright as 10.9 mag (Sept. 8, Chris Wyatt). It will be fading after this. In the Northern Hemisphere, it will be getting lower gradually in the evening. In the Southern Hemisphere, it stays observable in good condition for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 16 4.61 -22 32.3 2.538 2.243 61 11.7 19:17 ( 49, 14) Oct. 2 16 19.15 -24 13.8 2.636 2.277 58 11.9 19:06 ( 48, 12) C/2017 K2 ( PanSTARRS ) Now it is 12.2 mag (Sept. 4, Juan Jose Gonzalez). 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 autumn to 2023 summer. In the Southern Hemisphere, it stays 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) Sept.25 16 58.25 27 38.6 5.421 5.255 75 11.9 19:17 ( 88, 56) Oct. 2 16 59.96 26 13.6 5.432 5.195 71 11.8 19:06 ( 88, 52) 15P/Finlay It brightened very rapidly up to 10.7 mag in July (July 20, Osamu Miyazaki). Now it is fading. It has already faded down to 13.5 mag (Sept. 19, Seiichi Yoshida). It stays observable in the morning sky for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 7 55.79 26 35.8 1.492 1.422 66 12.7 4:25 (268, 48) Oct. 2 8 10.57 26 22.0 1.499 1.487 69 13.2 4:31 (270, 51) 19P/Borrelly Now it is 14.6 mag (Sept. 11, Chris Wyatt). It will brighten rapidly up to 9 mag in winter. It will be observable in good condition. In the Southern Hemisphere, it is observable in excellent condition. In the Northren Hemisphere, it is not observable until November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 23 38.05 -58 54.4 1.249 1.955 120 13.3 23:19 ( 0, -4) Oct. 2 23 27.38 -58 42.4 1.233 1.904 116 12.9 22:41 ( 0, -4) C/2021 A1 ( Leonard ) Now it is 13.1 mag (Sept. 20, Ken-ichi Kadota). 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, although it becomes extremely low temporarily in September. 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) Sept.25 11 13.28 38 23.6 2.586 1.944 41 13.5 4:25 (234, 15) Oct. 2 11 19.45 37 37.2 2.420 1.843 44 13.1 4:31 (237, 19) C/2019 T4 ( ATLAS ) Now it is 14.6 mag (July 12, Chris Wyatt). It is expected to brighten up to 11.5 mag in 2022. In the Southern Hemisphere, it stas observable in good condition for a long time, although it becomes extremely low temporarily from August to September. In the Northern Hemisphere, it is not observable until November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 10 35.87 -23 44.4 5.566 4.744 31 13.4 4:25 (290,-13) Oct. 2 10 43.56 -24 7.5 5.523 4.718 33 13.3 4:31 (294, -8) 29P/Schwassmann-Wachmann 1 Major outburst occured on Sept. 25. Now it is very bright as 11.1 mag (Sept. 29, Bob King). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 4 57.41 31 45.8 5.575 5.916 105 13.5 4:25 (310, 85) Oct. 2 4 57.75 31 54.5 5.473 5.918 111 13.5 4:16 ( 0, 87) C/2020 J1 ( SONEAR ) It brightened up to 12.3 mag from spring to summer (June 15, Marco Goiato). Now it is not observable. It will be observable again at 14 mag in November in the Northern Hemisphere, or in January in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 13 51.99 -3 15.2 4.540 3.669 26 13.7 19:17 ( 85, 2) Oct. 2 13 54.94 -2 56.3 4.615 3.696 20 13.8 19:06 ( 87, -1) 7P/Pons-Winnecke It brightened up to 9.7 mag in June (June 4, Michael Jager). Now it is fading. It has already faded down to 14.1 mag (Sept. 11, Chris Wyatt). In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it becomes extremely low after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 23 21.55 -48 53.4 1.055 1.861 129 14.3 23:03 ( 0, 6) Oct. 2 23 17.82 -47 14.2 1.139 1.914 126 14.6 22:32 ( 0, 8) 246P/NEAT Now it is 14.9 mag (Sept. 6, ATLAS-MLO, Mauna Loa). It stays 13-14 mag from 2020 to 2021. It will be observable in good condition after this in the Southern Hemisphere. It locates low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 18 56.83 -35 4.6 2.749 3.082 99 14.7 19:17 ( 8, 19) Oct. 2 19 2.68 -34 50.7 2.856 3.096 94 14.8 19:06 ( 10, 19) C/2020 PV6 ( PanSTARRS ) Now it is 14.6 mag (Sept. 8, Chris Wyatt). It stays 14 mag until October, and it is 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) Sept.25 16 14.59 21 41.0 2.543 2.296 64 14.7 19:17 ( 87, 45) Oct. 2 16 10.87 20 34.2 2.651 2.297 58 14.8 19:06 ( 88, 40) 10P/Tempel 2 It brightened up to 10.1 mag in spring (Apr. 10, Marco Goiato). Now it is fading. It has already faded down to 14.7 mag (Sept. 3, Michael Jager). It stays observable in good condition for a long time after this while the comet will fading. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 4 54.66 7 42.6 1.741 2.261 107 14.8 4:25 (352, 63) Oct. 2 4 55.60 7 18.8 1.704 2.305 114 14.9 4:13 ( 0, 62) C/2020 F5 ( MASTER ) Now it is 14.8 mag (Sept. 11, Chris Wyatt). It stays 14-15 mag until the end of 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. It locates low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 22 41.55 -30 29.3 3.747 4.586 142 14.8 22:23 ( 0, 25) Oct. 2 22 36.54 -29 36.3 3.824 4.605 136 14.8 21:51 ( 0, 26) P/2021 Q5 ( ATLAS ) Bright new periodic comet. Now it is 13.9 mag (Sept. 15, Michael Jager). It stays observable in good condition for a long time. It stays 14-15 mag until November. Juan Jose Gonzalez reported it is very bright as 11.6 mag on Sept. 17. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 8 24.80 15 30.8 1.496 1.271 57 14.9 4:25 (276, 36) Oct. 2 8 46.28 13 13.4 1.497 1.294 58 15.0 4:31 (281, 38) 252P/LINEAR It brightened up to 4 mag in major outburst in 2016. In this apparition, it brightened up to 10.5 mag in early August (Aug. 8, Rob Kaufman). Now it is fading rapidly. It has already faded down to 14.0 mag (Aug. 31, Chris Wyatt). In the Southern Hemisphere, it stays locating low in the evening sky until October. In the Northern Hemisphere, it stays locating extremely low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 14 44.55 -9 26.8 2.035 1.424 40 14.9 19:17 ( 72, 9) Oct. 2 15 8.06 -10 53.3 2.117 1.485 39 15.6 19:06 ( 69, 9) 132P/Helin-Roman-Alu 2 Now it is 15.6 mag (Sept. 5, Michael Jager). It is observable at 14-15 mag in excellent condition in autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 0 24.20 0 21.7 0.758 1.760 175 15.2 0:10 ( 0, 56) Oct. 2 0 23.05 -0 38.7 0.743 1.742 175 15.0 23:37 ( 0, 54) C/2019 F1 ( ATLAS-Africano ) Now it is 14.8 mag (Sept. 11, Chris Wyatt). It was expected to brighten up to 13 mag from spring to summer. But actually, it is fainter than originally expected. It stays 14-15 mag until early autumn. 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) Sept.25 20 50.06 -81 21.3 3.472 3.696 94 15.1 20:35 ( 0,-26) Oct. 2 20 58.36 -79 47.2 3.527 3.711 92 15.1 20:16 ( 0,-25) 108P/Ciffreo Now it is 14.1 mag (Sept. 15, Michael Jager). It stays 15 mag until November. It will be 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) Sept.25 6 0.72 24 11.4 1.302 1.667 91 15.1 4:25 (296, 69) Oct. 2 6 16.10 25 13.0 1.257 1.675 95 15.1 4:31 (302, 73) 22P/Kopff Now it is not observable. In the Southern Hemisphere, it will appear in the morning sky at 11 mag in late January, then it stays observable at 11 mag until June. In the Northern Hemisphere, it will appear in the morning sky in December, but it stays locating extremely low for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 12 58.90 -2 44.9 3.230 2.265 13 15.3 19:17 ( 92, -9) Oct. 2 13 11.91 -4 6.3 3.202 2.223 9 15.1 19:06 ( 92,-10) C/2018 U1 ( Lemmon ) Now it is 15.2 mag (Sept. 8, Chris Wyatt). It stays at 14-15 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) Sept.25 16 21.00 -17 30.8 5.349 5.002 64 15.1 19:17 ( 49, 20) Oct. 2 16 22.01 -18 24.1 5.455 4.999 58 15.2 19:06 ( 52, 17) 284P/McNaught Now it is 14.7 mag (Sept. 11, Chris Wyatt). It stays 15 mag until October, and it is observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 23 6.21 -15 36.4 1.337 2.297 157 15.4 22:48 ( 0, 39) Oct. 2 23 3.97 -16 21.1 1.375 2.300 150 15.4 22:19 ( 0, 39) 9P/Tempel 1 It will brighten up to 12 mag from winter to spring. Now it is not observable. In the Northern Hemisphere, it will appear in the morning sky at 14 mag in November. In the Southern Hemisphere, it is not observable until January. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 11 44.16 9 26.1 3.114 2.141 11 15.6 4:25 (253, -7) Oct. 2 11 58.34 7 50.4 3.058 2.102 14 15.4 4:31 (257, -5) C/2020 Y2 ( ATLAS ) Now it is 16.0 mag (Aug. 16, iTelescope Observatory, Siding Spring). 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, although it becomes extremely low temporarily from September to October. In the Northern Hemisphere, it is not observable for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 12 18.47 -28 7.0 4.881 4.019 27 15.5 19:17 ( 75,-30) Oct. 2 12 21.77 -29 14.7 4.856 3.979 25 15.4 4:31 (287,-29) 117P/Helin-Roman-Alu 1 Now it is 15.7 mag (Aug. 30, Thomas Lehmann). In the Northern Hemisphere, it is not observable now. It will be unobservable soon also in the Southern Hemisphere. It will appear in the morning sky at 15 mag in January. Then It will brighten up to 13 mag in 2022 summer. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 14 18.06 -12 8.5 4.115 3.337 34 15.5 19:17 ( 74, 2) Oct. 2 14 26.96 -13 3.4 4.154 3.324 29 15.5 19:06 ( 74, 0) 106P/Schuster Now it is 15.8 mag (Sept. 3, Michael Jager). It stays 15 mag until September. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will be getting lower gradually after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 7 4.51 28 59.1 1.451 1.579 77 15.6 4:25 (271, 59) Oct. 2 7 23.50 30 12.9 1.420 1.600 80 15.7 4:31 (271, 62) C/2020 R7 ( ATLAS ) Now it is 16.6 mag (Sept. 12, J. Drummond). It will brighten up to 12.5 mag in 2022 summer. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is not observable until August in 2022. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 3 27.54 -70 21.1 4.199 4.511 101 15.7 3:12 ( 0,-15) Oct. 2 3 8.68 -72 22.2 4.177 4.464 100 15.6 2:26 ( 0,-17) C/2020 M5 ( ATLAS ) Now it is 15.4 mag (Sept. 8, Thomas Lehmann). In the Northern Hemisphere, it stays observable at 15-16 mag for a long time until early 2022, although it becomes extremely low temporarily from September to October. 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) Sept.25 12 49.64 31 26.5 3.808 3.026 33 15.6 19:17 (122, 9) Oct. 2 12 53.57 29 34.1 3.820 3.035 33 15.6 19:06 (122, 6) C/2021 A7 ( NEOWISE ) It brightened up to 14.2 mag in early summer (June 10, Thomas Lehmann). Now it is not observable. It will be fading after this. In the Northern Hemisphere, it will appear in the morning sky at 16 mag in October. In the Southern Hemisphere, it will never be observable again. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 11 51.66 23 16.1 3.026 2.152 24 15.7 4:25 (241, 0) Oct. 2 12 6.84 24 11.2 3.016 2.187 28 15.8 4:31 (243, 4) 17P/Holmes Outburst occured in early August. Now it is 15.7 mag (Sept. 9, Thomas Lehmann). In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemipsphere, it stays locating extremely low after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 5 46.03 44 35.3 2.354 2.626 94 15.8 4:25 (228, 74) Oct. 2 5 52.01 45 18.2 2.299 2.655 99 16.0 4:31 (213, 77) C/2019 U5 ( PanSTARRS ) Now it is 15.9 mag (Aug. 29, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. 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) Sept.25 16 5.46 38 28.6 6.265 5.949 67 15.9 19:17 (111, 49) Oct. 2 16 5.80 37 25.5 6.272 5.905 64 15.8 19:06 (110, 45) 110P/Hartley 3 Now it is 16.3 mag (Sept. 12, ATLAS-MLO, Mauna Loa). It will brightens rapidly. And it will be observable at 15 mag in excellent condition in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 7 34.11 25 22.8 2.602 2.460 70 16.0 4:25 (272, 52) Oct. 2 7 44.98 24 41.3 2.518 2.458 75 15.9 4:31 (277, 56) C/2021 E3 ( ZTF ) Now it is 16.4 mag (Sept. 9, Michael Jager). It is expected to brighten up to 11 mag from spring to summer in 2022. In the Southen Hemisphere, it locates somewhat low in 2021, but it will be observable in good condition at the high light for a long time. In the Northern Hemisphere, it is observable in good condition in 2021, but it will not be observable at the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 18 39.74 18 18.9 3.276 3.558 98 16.1 19:17 ( 39, 69) Oct. 2 18 37.19 15 51.4 3.310 3.494 92 16.0 19:06 ( 45, 65) C/2020 O2 ( Amaral ) Now it is 15.7 mag (Sept. 9, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 15-16 mag in good condition until autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 16 40.24 -9 37.2 5.143 4.867 68 16.1 19:17 ( 51, 29) Oct. 2 16 43.83 -9 10.9 5.246 4.870 62 16.1 19:06 ( 54, 28) C/2019 T2 ( Lemmon ) It was expected to brighten up to 14.5 mag from spring to summer. But actually, it is fainter than expected. Now it is 17.7 mag (July 4, Mount John Observatory, Lake Tekapo). In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is not observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 11 12.31 -52 8.0 3.608 3.103 52 16.2 4:25 (315,-32) Oct. 2 11 21.05 -51 48.5 3.680 3.141 50 16.3 4:31 (316,-28) C/2019 N1 ( ATLAS ) It brightened up to 11.6 mag in winter (Feb. 18, Thomas Lehmann). Now it is fading. It has already faded down to 15.4 mag (Aug. 20, Thomas Lehmann). 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) Sept.25 4 41.94 -68 12.1 3.652 3.904 97 16.3 4:25 ( 0,-13) Oct. 2 4 22.63 -69 16.5 3.709 3.968 97 16.4 3:40 ( 0,-14) C/2021 D2 ( ZTF ) Now it is 17.6 mag (Sept. 2, Michael Jager). It will brighten up to 15.5 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable at all in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 15 41.86 66 26.9 3.299 3.226 77 16.4 19:17 (151, 44) Oct. 2 15 39.10 65 18.8 3.278 3.198 76 16.3 19:06 (149, 42) C/2019 T3 ( ATLAS ) Now it is 16.3 mag (Sept. 9, Toshihiko Ikemura, Hirohisa Sato). It is observable at 16 mag from 2020 to 2021. It locates low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 21 50.74 36 40.1 5.401 6.121 132 16.3 21:33 (180, 88) Oct. 2 21 45.64 35 6.9 5.439 6.133 130 16.4 21:00 (180, 90) 57P/du Toit-Neujmin-Delporte Now it is 16.7 mag (Sept. 12, ATLAS-HKO, Haleakala). It stays 16.5 mag until October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 17 8.43 -20 1.7 1.675 1.733 76 16.4 19:17 ( 38, 25) Oct. 2 17 25.99 -20 28.3 1.722 1.726 73 16.4 19:06 ( 37, 25) 402P/2020 Q3 ( LINEAR ) First return of a new periodic comet observed at 16 mag from 2003 to 2004. Now it is 17.5 mag (Sept. 5, ATLAS-HKO, Haleakala). It will brighten up to 16 mag in winter, and it will be observable in excellent condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 6 28.75 1 38.7 3.933 3.965 84 16.5 4:25 (317, 48) Oct. 2 6 32.65 1 26.9 3.833 3.960 89 16.4 4:31 (327, 52) C/2020 K1 ( PanSTARRS ) Now it is 16.4 mag (Aug. 30, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 11 mag in 2023. In the Northern Hemisphere, it is observable in good condition in 2021. But it is observable only until November in 2022. In the Southern Hemisphere, it locates extremely low in 2021. 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) Sept.25 17 26.26 32 8.5 6.212 6.150 81 16.4 19:17 ( 93, 63) Oct. 2 17 27.46 30 48.1 6.230 6.101 78 16.4 19:06 ( 92, 60) C/2021 K1 ( ATLAS ) Now it is 15.3 mag (Sept. 9, Sandor Szabo). It will be fading after this, and it will be fainter than 18 mag in November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 1 10.68 -12 24.3 1.892 2.853 159 16.4 0:57 ( 0, 43) Oct. 2 1 7.68 -13 13.4 1.920 2.885 161 16.5 0:26 ( 0, 42) 104P/Kowal 2 Now it is 18.2 mag (Sept. 9, Toshihiko Ikemura, Hirohisa Sato). It will brightens rapidly. And it is expected to be observable at 12-13 mag in good condition from December to February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 21 54.76 -4 17.8 0.800 1.728 146 16.8 21:37 ( 0, 51) Oct. 2 21 48.14 -5 34.9 0.784 1.669 138 16.4 21:03 ( 0, 49) 193P/LINEAR-NEAT Now it is 15.7 mag (Sept. 2, Michael Jager). It stays observable at 16 mag in good condition until October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 23 4.49 1 0.1 1.197 2.180 164 16.5 22:46 ( 0, 56) Oct. 2 23 0.13 1 13.8 1.229 2.186 156 16.6 22:15 ( 0, 56) C/2019 O3 ( Palomar ) Now it is 16.6 mag (Sept. 8, Michael Jager). It stays at 16-17 mag from 2020 to 2021. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 18 20.45 49 30.7 8.791 8.896 92 16.6 19:17 (143, 70) Oct. 2 18 19.66 49 6.1 8.835 8.901 90 16.7 19:06 (137, 68) 422P/2021 L1 ( Christensen ) First return of a new periodic comet which brightened up to 17 mag in 2006. Now it is 17.4 mag (Sept. 7, J. L. Virlichie, P. Traverse). It stays 17 mag from 2021 to 2022. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 21 31.37 -65 1.7 2.736 3.199 108 16.8 21:14 ( 0,-10) Oct. 2 21 29.75 -63 28.6 2.779 3.188 104 16.8 20:45 ( 0, -8) 52P/Harrington-Abell Now it is 17.0 mag (Sept. 9, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag from autumn to winter. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it stays extremely low until November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 9 20.09 21 26.7 2.318 1.780 46 16.8 4:25 (262, 28) Oct. 2 9 38.10 19 46.1 2.273 1.777 48 16.8 4:31 (266, 30) C/2020 U5 ( PanSTARRS ) Now it is 17.6 mag (Sept. 11, Catalina Sky Survey). It will brighten up to 16 mag 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 2023. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 8 41.93 54 13.1 4.455 4.204 69 17.0 4:25 (226, 45) Oct. 2 8 50.52 55 45.3 4.334 4.177 74 16.9 4:31 (223, 48) 254P/McNaught Now it is 16.9 mag (Sept. 19, Ken-ichi Kadota). It continues brightening even after the perihelion passage. It stays observable at 17 mag in good condition for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 5 10.25 -12 27.9 3.292 3.661 103 17.0 4:25 (350, 42) Oct. 2 5 11.52 -13 10.0 3.233 3.678 108 17.0 4:29 ( 0, 42) C/2020 F7 ( Lemmon ) Now it is 17.7 mag (May 12, ATLAS-HKO, Haleakala). It brightened rapidly. It stays 17 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 will be observable only in extremely low sky from autumn to winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 9 4.22 -22 20.3 5.944 5.345 49 17.1 4:25 (302, 5) Oct. 2 9 6.11 -23 44.9 5.874 5.342 53 17.0 4:31 (308, 9) 2012 US136 Peculiar asteroid moving along a cometary orbit. It brightens up to 17 mag from September to October. In the Northern Hemisphere, it is observable in excellent condition. It is not observable in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 8 33.81 74 34.8 0.522 1.061 81 17.1 4:25 (198, 42) Oct. 2 8 8.78 85 60.0 0.594 1.180 91 17.2 4:31 (184, 38) C/2019 K7 ( Smith ) Now it is 16.9 mag (Aug. 29, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. In the Northern Hemisphere, it stays observable in good condition for a long time. It is not observable after this in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 16 13.61 50 18.0 6.013 5.799 72 17.1 19:17 (129, 51) Oct. 2 16 14.32 49 39.4 6.075 5.833 71 17.2 19:06 (128, 48) P/2021 N2 ( Fuls ) Now it is 17.2 mag (Sept. 2, Michael Jager). It is observable at 17 mag in good condition in autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 2 30.49 18 1.4 2.979 3.808 140 17.2 2:16 ( 0, 73) Oct. 2 2 28.75 17 36.3 2.919 3.805 148 17.1 1:47 ( 0, 73) C/2017 Y2 ( PanSTARRS ) Now it is 16.9 mag (Aug. 21, ATLAS-MLO, Mauna Loa). It is fading slowly after this. It becomes unobservable from October to December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 15 10.09 -24 30.5 5.879 5.294 50 17.2 19:17 ( 56, 4) Oct. 2 15 11.37 -25 1.5 5.995 5.320 43 17.3 19:06 ( 58, 1) 241P/LINEAR Now it is 17.2 mag (Sept. 8, Catalina Sky Survey). In the Northern Hemisphere, it stays observable at 17 mag in good condition until winter. In the Southern Hemisphere, it stays locating extremely low for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 7 58.64 33 27.0 2.165 2.006 67 17.2 4:25 (258, 49) Oct. 2 8 12.88 32 22.9 2.119 2.027 70 17.2 4:31 (261, 53) 28P/Neujmin 1 Now it is 17.4 mag (Sept. 3, Michael Jager). In the Northern Hemisphere, it stays observable in good condition after this while the comet will be fading. In the Southern Hemisphere, it stays locating extremely low for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 5 23.77 39 3.1 2.356 2.699 98 17.3 4:25 (242, 80) Oct. 2 5 26.26 39 46.9 2.323 2.754 104 17.2 4:31 (208, 85) 70P/Kojima Now it is 17.4 mag (Aug. 28, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag, and will be observable in excellent condition in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 8 41.64 16 52.4 2.464 2.034 53 17.4 4:25 (272, 34) Oct. 2 8 57.31 16 4.6 2.398 2.026 56 17.3 4:31 (276, 37) C/2017 U7 ( PanSTARRS ) Now it is 17.7 mag (Sept. 9, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 16 52.01 -10 37.3 8.358 8.096 71 17.3 19:17 ( 48, 30) Oct. 2 16 52.22 -10 34.5 8.498 8.123 64 17.3 19:06 ( 51, 28) C/2020 S3 ( Erasmus ) It brightened up to 3 mag in December in the SOHO spacecraft images in 2020 December (Dec. 18, Hirohisa Sato). Now it is 16.5 mag (Sept. 5, Thomas Lehmann). It stays observable in good condition after this while the comet will be fading. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 23 27.77 16 3.2 3.439 4.403 161 17.4 23:09 ( 0, 71) Oct. 2 23 22.41 15 10.8 3.530 4.480 159 17.5 22:37 ( 0, 70) C/2020 U4 ( PanSTARRS ) Now it is 18.1 mag (Sept. 11, ATLAS-HKO, Haleakala). It stays 17 mag for a long time from 2021 to 2022. 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) Sept.25 5 27.44 33 17.7 5.306 5.545 98 17.5 4:25 (276, 80) Oct. 2 5 22.36 33 36.0 5.166 5.532 106 17.4 4:31 (305, 88) 230P/LINEAR Now it is 17.0 mag (Aug. 26, J. Drummond). It will brighten up to 16.5-17 mag in winter. In its last apparition in 2015, it brightened up to 13 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 21 48.88 -32 56.0 1.469 2.276 133 17.6 21:31 ( 0, 22) Oct. 2 21 45.80 -33 6.0 1.490 2.234 126 17.6 21:01 ( 0, 22) C/2021 O3 ( PanSTARRS ) Now it is 18.2 mag (Sept. 7, Katsumi Yoshimoto). It is expected to brighten up to 4.5 mag in 2022 April. However, it is not observable at the high light. In the Northern Hemisphere, it stays observable until early February when it brightens up to 14 mag. Then it will appear at 6 mag in mid May, and it stays observable in good condition after that while the comet will be fading. In the Southern Hemisphere, it stays observable until December when it brightens up to 16 mag. But after that, it is not observable until 2022 August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 22 31.80 23 47.9 2.713 3.599 147 17.7 22:13 ( 0, 79) Oct. 2 22 23.97 22 19.8 2.655 3.512 143 17.6 21:38 ( 0, 77) 119P/Parker-Hartley Now it is 17.9 mag (Aug. 28, ATLAS-HKO, Haleakala). It will brighten up to 15 mag in 2022 winter. In 2021, it stays observable in good condition while the comet will be brightening gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 22 31.72 -18 42.7 2.212 3.119 149 17.6 22:14 ( 0, 36) Oct. 2 22 28.02 -18 59.6 2.241 3.093 142 17.6 21:43 ( 0, 36) 116P/Wild 4 Now it is 18.2 mag (Sept. 6, W. Hasubick). It will brighten rapidly, and it will be observable at 13.5 mag in good condition from winter to spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 8 36.63 21 48.9 3.356 2.915 55 17.7 4:25 (268, 37) Oct. 2 8 46.67 21 16.1 3.249 2.889 60 17.6 4:31 (272, 42) 424P/2021 L5 ( La Sagra ) First return of a new periodic comet which brightened up to 17 mag in 2012. Now it is 18.1 mag (Aug. 29, ATLAS-MLO, Mauna Loa). In the Southern Hemisphere, it is observable at 17.5 mag in excellent condition in summer. It locates low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 20 1.01 -37 52.9 0.719 1.434 111 17.7 19:45 ( 0, 17) Oct. 2 20 15.38 -36 17.7 0.727 1.410 108 17.7 19:32 ( 0, 19) 395P/2020 H1 ( Catalina-NEAT ) Now it is 17.4 mag (Sept. 9, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17-18 mag for a long time from 2021 to 2022. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 19 8.45 -18 59.3 3.732 4.096 104 17.7 19:17 ( 7, 36) Oct. 2 19 11.36 -18 59.1 3.829 4.092 98 17.7 19:06 ( 11, 35) 378P/2019 E2 ( McNaught ) Now it is 18.2 mag (Aug. 28, Toshihiko Ikemura, Hirohisa Sato). It has passed the perihelion in 2020 October. At the discovery in 2005, it stayed bright for several years even after the perihelion passage. In this apparition, it may stay observable at 18 mag from 2021 to 2024. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 23 26.58 -29 27.7 3.094 3.982 148 17.8 23:08 ( 0, 26) Oct. 2 23 23.13 -29 32.7 3.158 4.004 143 17.8 22:38 ( 0, 26) P/2021 Q2 ( Scotti ) First return of a new periodic comet which brightened up to 17 mag in 2011. Now it is 17.2 mag (Sept. 16, Catalina Sky Survey). It stays observable at 17 mag in good condition until 2022 spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 9 12.37 19 3.9 2.201 1.687 47 18.0 4:25 (266, 29) Oct. 2 9 32.52 17 41.8 2.137 1.663 49 17.9 4:31 (269, 31) C/2021 P4 ( ATLAS ) Now it is 17.8 mag (Sept. 12, S. Shurpakov). It is expected to brighten up to 11 mag in 2022 summer. In the Northern Hemisphere, it stays observable in good condition until 2022 June when it brightens up to 11 mag. But it is not observable after the high light. In the Souther Hemisphere, it is not observable until 2022 October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 0 16.41 62 47.3 3.634 4.198 117 18.0 0:03 (180, 62) Oct. 2 0 2.49 63 12.1 3.534 4.127 120 17.9 23:16 (180, 62) 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 18.3 mag (Aug. 19, J. Drummond). 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) Sept.25 16 20.41 -45 8.5 6.062 5.814 71 17.9 19:17 ( 32, -1) Oct. 2 16 24.63 -45 10.7 6.217 5.874 65 18.0 19:06 ( 33, -3) C/2020 S4 ( PanSTARRS ) Now it is 18.3 mag (Sept. 9, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 14 mag in early 2023. It stays observable in good condition for a long time until spring. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 4 54.14 3 57.3 5.189 5.584 108 18.0 4:25 (353, 59) Oct. 2 4 54.84 3 43.8 5.049 5.538 114 17.9 4:13 ( 0, 59) (248370) 2005 QN173 Now it is 18.2 mag (Sept. 8, Michael Jager). Main-belt asteroid, but it has a long tail of 10 arcmin (Sept. 4, Michael Jager). It stays observable in good condition until winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept.25 23 50.60 -1 1.7 1.473 2.474 175 19.0 23:32 ( 0, 54) Oct. 2 23 45.62 -1 34.2 1.498 2.485 167 19.3 23:00 ( 0, 54)