Weekly Information about Bright Comets (2020 Aug. 29: North)

Japanese version Home page	Updated on August 29, 2020
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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/2020 F3 ( NEOWISE ) Great comet. It approached to Sun down to 0.29 a.u. on July 3, and it brightened up to 0.6 mag (Alan Hale). Now it is fading. But it is still bright as 8.0 mag (Aug. 24, Chris Wyatt). It stays observable in the evening sky until early October when it fades down to 12 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 14 19.27 -1 34.7 1.618 1.381 57 9.1 19:59 ( 72, 21) Sept. 5 14 30.99 -4 45.7 1.841 1.507 54 9.8 19:47 ( 70, 18) 88P/Howell Now it is 9.3 mag (Aug. 19, Katsumi Yoshimoto). It stays bright as 8-9 mag until autumn. It will be observable in excellent condition in the Southern Hemisphere. It locates very low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 14 55.06 -19 21.0 1.335 1.390 71 9.3 19:59 ( 52, 16) Sept. 5 15 16.19 -21 3.1 1.348 1.374 69 9.1 19:47 ( 50, 15) C/2017 T2 ( PanSTARRS ) Now it is 10.9 mag (Aug. 15, Carlos Labordena). It stays observable in the evening sky until September when it fades down to 12 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 14 8.37 4 48.2 2.653 2.219 54 10.8 19:59 ( 79, 23) Sept. 5 14 18.23 1 48.6 2.780 2.279 50 11.1 19:47 ( 78, 20) C/2020 K8 ( Catalina-ATLAS ) Now it is 14.2 mag (Aug. 18, Alan Hale). Small comet. But it approaches to Sun down to 0.47 a.u. in September, and it was expected to brighten up to 11 mag. But actually, it is much fainter than this ephemeris recently. It will be unobservable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 7 57.32 10 58.5 0.727 0.622 37 11.2 4:02 (266, 13) Sept. 5 8 48.64 4 55.5 0.866 0.530 31 10.9 4:08 (268, 6) C/2020 M3 ( ATLAS ) It brightened rapidly. Now it is very bright as 11.4 mag (Aug. 28, Michael Mattiazzo). It will brighten up to 9-10 mag from October to November, and will be observable in excellent condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 2 50.97 -36 24.3 0.786 1.523 115 11.8 4:02 (356, 19) Sept. 5 3 11.35 -36 23.0 0.726 1.470 114 11.5 4:08 (359, 19) C/2019 U6 ( Lemmon ) It brightened up to 6.0 mag in June (June 13, Marco Goiato). Now it is fading. It has already faded down to 10.9 mag (Aug. 24, Chris Wyatt). It stays observable in good condition for a long time after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 15 2.10 22 12.2 1.612 1.516 66 12.3 19:59 ( 88, 43) Sept. 5 15 21.44 22 36.2 1.731 1.603 65 13.0 19:47 ( 89, 44) C/2020 Q1 ( Borisov ) Bright new comet. Now it is 14.0 mag (Aug. 25, Michael Jager). It is very bright as 11.6 mag visually (Aug. 25, Juan Jose Gonzalez). It approaches to Earth down to 0.7 a.u. in September, and it will brighten up to 13 mag. It stays observable in excellent condition in the Northern Hemipshere. In the Southern Hemipshere, it is not obserbvable at the high light. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 5 21.37 38 30.1 1.195 1.339 74 13.7 4:02 (252, 56) Sept. 5 5 2.49 45 56.7 1.023 1.358 83 13.4 4:08 (235, 65) 29P/Schwassmann-Wachmann 1 Outburst occured on July 27. It is bright as 13.0 mag still now (Aug. 24, Chris Wyatt). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 2 53.26 27 0.7 5.449 5.821 106 13.4 4:02 (327, 81) Sept. 5 2 53.31 27 13.2 5.349 5.822 113 13.4 3:57 ( 0, 82) C/2019 N1 ( ATLAS ) Now it is 14.0 mag (Aug. 20, Sandor Szabo). It is expected to brighten up to 12 mag from autumn to winter. It will be unobservable soon also in the Northern Hemisphere. In the Southern Hemisphere, it will appear in the morning sky in December, then it stays observable in good condition. In the Northern Hemisphere, it will be observable in the extremely low sky only from November to December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 12 29.65 25 44.0 2.878 2.099 32 13.5 19:59 (111, 14) Sept. 5 12 35.46 22 17.3 2.878 2.049 28 13.5 19:47 (110, 10) 58P/Jackson-Neujmin Recovered from SWAN images after 24-year blank. It brightened up to 10.2 mag in spring (May 31, Marco Goiato). Now it is fading. It has already faded down to 15.2 mag (Aug. 21, Sandor Szabo). It stays observable for a long time after this until the comet fades out. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 6 12.94 11 47.4 1.954 1.749 63 13.8 4:02 (281, 35) Sept. 5 6 26.52 11 12.4 1.941 1.796 66 14.1 4:08 (285, 39) 2P/Encke It passed the perihelion on June 25, and brightened up to 7.3 mag (June 30, Chris Wyatt). Now it is fading. It has already faded down to 14.3 mag (Aug. 20, Ken-ichi Kadota). In the Southern Hemisphere, it stays observable in good condition in the evening sky while the comet will be fading. It locates very low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 15 45.66 -31 37.3 0.958 1.337 85 14.2 19:59 ( 35, 13) Sept. 5 16 20.10 -31 49.8 1.093 1.435 86 15.0 19:47 ( 31, 15) 246P/NEAT Now it is 14.2 mag (July 16, Paul Camilleri). It stays 13-14 mag from 2020 to 2021. It will be unobservable in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 13 35.91 -0 14.6 3.613 3.018 47 14.4 19:59 ( 80, 13) Sept. 5 13 44.54 -1 31.8 3.666 3.007 42 14.4 19:47 ( 80, 11) C/2018 N2 ( ASASSN ) Now it is 14.0 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). It stays 14 mag until autumn. In the Southern Hemisphere, it will never be observable again. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 13 17.84 76 50.3 4.389 4.171 70 14.5 19:59 (164, 37) Sept. 5 13 36.99 74 54.2 4.417 4.213 71 14.6 19:47 (161, 37) C/2020 P1 ( NEOWISE ) Now it is 15.3 mag (Aug. 16, M. Mattiazzo). Although it is a tiny comet, it will approach to Sun down to 0.34 a.u. on Oct. 20, and it is expected to brighten up to 8.5 mag. In the Southern Hemisphere, it stays observable in good condition until late September when it brightens up to 11.5 mag. In the Northern Hemisphere, it stays unobservable for a while. But it will appear in the morning sky at 10 mag in late October. Then it stasy observable while the comet will be fading rapidly. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 12 24.81 -63 18.9 1.067 1.278 75 15.2 19:59 ( 32,-31) Sept. 5 12 26.18 -59 55.6 1.015 1.148 69 14.6 19:47 ( 36,-32) C/2020 H4 ( Leonard ) It was expected to brighten very rapidly, and brighten up to 14.5 mag from August to September. However, its current brightness is very uncertain. It could not be detected as fainter than 18.0 mag on June 30 (Charles S. Morris), and fainter than 15.7 mag on July 13 (Sandor Szabo). However, Giuseppe Pappa reported as 14 mag on July 10, and Thomas Lehmann reported it is bright as 15.2 mag on July 12. In the Northern Hemisphere, it stays observable for a long time, although it becomes extremely low in early September. In the Southern Hemisphere, it is not observable until late October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 10 41.61 42 34.4 1.601 0.939 33 14.7 19:59 (138, 6) Sept. 5 10 43.73 37 13.9 1.664 0.946 30 14.9 4:08 (226, 4) C/2017 K2 ( PanSTARRS ) Now it is 15.0 mag (Aug. 14, 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 is only visible in the extremely low sky in summer in 2020. 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) Aug. 29 17 5.07 47 6.3 8.347 8.389 88 14.8 19:59 (133, 70) Sept. 5 17 4.39 46 10.1 8.337 8.337 86 14.8 19:47 (128, 68) C/2019 F1 ( ATLAS-Africano ) Now it is 15.8 mag (Aug. 6, ATLAS-MLO, Mauna Loa). It will brighten up to 13 mag in 2021. In the Southern Hemisphere, it stays observable at 15 mag until October. 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) Aug. 29 14 2.46 -27 17.4 4.834 4.468 63 14.9 19:59 ( 55, 1) Sept. 5 14 6.58 -28 3.6 4.888 4.432 57 14.9 19:47 ( 56, -1) C/2020 F5 ( MASTER ) Now it is 14.5 mag (Aug. 18, T. Prystavski). It stays 14-15 mag until 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until June in 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 15 52.65 -76 22.2 4.420 4.650 96 15.2 19:59 ( 9,-24) Sept. 5 16 9.76 -75 29.0 4.453 4.630 93 15.2 19:47 ( 10,-23) C/2019 L3 ( ATLAS ) Now it is 14.9 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 12 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 2021 November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 0 52.44 63 46.9 5.307 5.606 102 15.3 2:24 (180, 61) Sept. 5 0 49.10 64 27.4 5.205 5.562 105 15.2 1:53 (180, 60) C/2020 J1 ( SONEAR ) Now it is 14.5 mag (Aug. 18, T. Prystavski). It will brighten up to 13.5 mag in spring in 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until spring in 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 18 0.37 -62 1.5 3.545 3.985 108 15.3 19:59 ( 4, -7) Sept. 5 17 45.43 -60 19.2 3.616 3.952 102 15.3 19:47 ( 8, -6) C/2020 F8 ( SWAN ) It brightened up to 4.7 mag in early May (May 2, Marco Goiato). However, it has faded and got diffused after that. It had already faded down to 7.3 mag in late May (May 21, Mitsunori Tsumura). It is appearing in the morning sky. However, maybe it has already disappeared. It stays observable in good condition after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 6 46.82 13 51.7 2.323 1.927 54 15.4 4:02 (273, 29) Sept. 5 6 46.45 11 57.9 2.310 2.034 61 15.6 4:08 (280, 35) 84P/Giclas Now it is 15.5 mag (Aug. 18, Giuseppe Pappa). It stays 15.5 mag from summer to winter, and 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) Aug. 29 6 41.15 19 28.0 2.261 1.895 56 15.5 4:02 (268, 33) Sept. 5 6 56.34 19 21.0 2.229 1.922 59 15.5 4:08 (271, 37) C/2018 F4 ( PanSTARRS ) It brightened up to 13.5 mag in winter (Dec. 6, Chris Wyatt). Now it is fading slowly. Now it is 15.3 mag (Aug. 8, ATLAS-HKO, Haleakala). In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it is appearing in the morning sky, but it stays low for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 3 14.00 -36 52.6 3.756 4.222 110 15.5 4:02 (351, 18) Sept. 5 3 8.52 -37 17.5 3.727 4.258 115 15.6 4:08 (359, 18) C/2019 K7 ( Smith ) Now it is 15.5 mag (Aug. 14, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag for a long time until 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 18 46.74 20 13.1 3.958 4.514 117 15.5 20:14 ( 0, 75) Sept. 5 18 40.73 20 7.1 4.050 4.522 111 15.6 19:47 ( 6, 75) 115P/Maury Now it is 15.9 mag (Aug. 11, Toshihiko Ikemura, Hirohisa Sato). It stays observable until December when it becomes fainter than 18 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 19 14.26 -8 14.3 1.261 2.073 131 15.8 20:43 ( 0, 47) Sept. 5 19 18.89 -9 19.8 1.320 2.082 126 15.9 20:20 ( 0, 46) C/2017 U7 ( PanSTARRS ) Now it is 16.2 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). It is observable at 15-16 mag in 2020. It is observable in excellent condition 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) Aug. 29 18 11.75 -26 41.2 6.329 6.844 116 15.9 19:59 ( 5, 28) Sept. 5 18 8.03 -26 18.1 6.463 6.860 109 16.0 19:47 ( 10, 28) C/2018 U1 ( Lemmon ) Now it is 15.3 mag (Aug. 20, Sandor Szabo). It will stay at 15 mag for a long time from 2021 to 2022. In the Northern Hemisphere, it stays observable in good condition while brightening gradually. In the Southern Hemisphere, it stays locating low for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 17 33.27 23 32.8 5.701 5.966 100 16.0 19:59 ( 51, 73) Sept. 5 17 30.90 22 7.9 5.756 5.938 95 16.0 19:47 ( 57, 69) C/2019 T2 ( Lemmon ) Now it is 16.0 mag (Aug. 20, Sandor Szabo). It will brighten up to 14.5 mag from spring to summer in 2021. In the Southern Hemisphere, it stays observable in excellent condition for a long time. In the Northern Hemisphere, it is observable in good condition in 2020, however, it will be unobservable in 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 22 29.44 -6 18.3 2.579 3.588 176 16.2 0:01 ( 0, 49) Sept. 5 22 19.35 -9 0.9 2.543 3.542 170 16.1 23:18 ( 0, 46) 162P/Siding Spring Now it is 15.8 mag (Aug. 16, M. Mattiazzo). It brightens up to 16 mag from summer to winter. In the Southern Hemisphere, it is observable in excellent condition. In the Northern Hemisphere, it is not observable until late October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 21 13.73 -70 2.6 0.974 1.702 118 16.1 22:41 ( 0,-15) Sept. 5 20 59.25 -68 42.7 0.953 1.656 115 16.1 21:59 ( 0,-14) 304P/Ory Now it is 15.7 mag (Aug. 17, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag until late September. It is observable in good condition in the Northern Hemisphere. It locates low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 6 14.65 22 57.9 1.373 1.274 62 16.2 4:02 (268, 40) Sept. 5 6 39.52 22 56.7 1.370 1.289 63 16.2 4:08 (270, 42) 257P/Catalina Now it is 15.8 mag (Aug. 4, D. Buczynski). It stays 16.5 mag until October, and observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 20 12.31 13 13.7 1.278 2.145 138 16.3 21:40 ( 0, 68) Sept. 5 20 12.62 11 42.9 1.305 2.143 135 16.4 21:13 ( 0, 67) C/2017 B3 ( LINEAR ) It brightened up to 13.8 mag in autumn in 2019 (Sept. 3, Chris Wyatt). Now it is fading slowly. Now it is 15.6 mag (Aug. 20, Sandor Szabo). In 2020, it stays observable in good condition while the comet will be fading from 16 to 17 mag. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 0 24.77 1 30.1 5.267 6.159 149 16.4 1:56 ( 0, 57) Sept. 5 0 20.87 1 36.0 5.259 6.200 157 16.5 1:25 ( 0, 57) 17P/Holmes Now it is 17.2 mag (Aug. 17, P. Camilleri, H. Williams). It brightens up to 15 mag in winter. But it is not observable at high light. In the Southern Hemisphere, it stays observable in good condition until autumn when the comet will brighten up to 16 mag. It stays locating very low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 17 55.03 -38 3.4 1.892 2.461 112 16.6 19:59 ( 7, 17) Sept. 5 17 59.15 -36 49.6 1.945 2.435 106 16.5 19:47 ( 10, 17) C/2019 T4 ( ATLAS ) Now it is 15.9 mag (Apr. 24, J. Drummond). It is expected to brighten up to 13 mag in 2022. In 2020, it is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it is not observable. It will be observable from autumn to winter, but it locating extremely low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 7 52.39 -27 46.7 7.228 6.674 53 16.5 4:02 (298, -8) Sept. 5 7 57.50 -28 20.8 7.153 6.635 55 16.5 4:08 (303, -4) C/2017 Y2 ( PanSTARRS ) Now it is 16.0 mag (Aug. 20, Sandor Szabo). It is observable at 16.5-17 mag from spring in 2020 to summer in 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 17 28.43 10 43.7 4.344 4.663 102 16.7 19:59 ( 34, 62) Sept. 5 17 24.25 9 9.7 4.445 4.657 95 16.8 19:47 ( 41, 58) C/2019 T3 ( ATLAS ) Now it is 16.8 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). It is observable at 16.5-17 mag from 2020 to 2021. In the Southern Hemisphere, it is not observable until summer in 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 0 39.38 74 46.0 5.941 6.088 93 16.8 2:12 (180, 50) Sept. 5 0 18.33 74 41.7 5.863 6.078 97 16.7 1:23 (180, 50) 156P/Russell-LINEAR Now it is 17.0 mag (Aug. 22, ATLAS-MLO, Mauna Loa). It is expected to brighten up to 16 mag from October to November, and it will be observable in excellent condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 0 15.41 -37 41.5 0.692 1.618 143 17.0 1:47 ( 0, 17) Sept. 5 0 12.48 -37 57.3 0.643 1.576 144 16.8 1:16 ( 0, 17) C/2018 A6 ( Gibbs ) It brightened up to 13.2 mag from spring to autumn in 2019 (June 30, Thomas Lehmann). Now it is fading slowly. It has already faded down to 16.7 mag (Aug. 12, ATLAS-HKO, Haleakala). In the Southern Hemisphere, it stays observable for a long time. In the Northern Hemisphere, it stays low for a long time. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 23 10.39 -30 51.7 3.642 4.586 156 16.9 0:42 ( 0, 24) Sept. 5 23 1.54 -30 36.0 3.686 4.627 156 17.0 0:06 ( 0, 24) (6478) Gault Now it is 17.5 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). Main-belt asteroid. But it showed a straight tail like a comet in 2019. In 2020, it brightens up to 16.5 mag and stays observable in good condition from September to October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 0 38.76 9 22.7 1.323 2.214 142 17.2 2:10 ( 0, 65) Sept. 5 0 35.32 7 40.0 1.293 2.230 151 17.0 1:39 ( 0, 63) C/2019 O3 ( Palomar ) Now it is 16.6 mag (Aug. 15, Charles S. Morris). It stays at 17 mag from 2020 to 2021. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 19 4.88 31 57.1 8.402 8.889 115 17.1 20:32 ( 0, 87) Sept. 5 19 2.21 31 45.2 8.452 8.884 112 17.1 20:02 ( 0, 87) P/2020 M2 ( Lemmon ) First return of a new periodic comet which brightened up to 17.5 mag in 2012. Now it is 17.5 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag in good condition from summer to winter. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 4 35.22 29 11.5 2.204 2.333 84 17.2 4:02 (274, 63) Sept. 5 4 44.83 30 7.1 2.135 2.345 88 17.2 4:08 (276, 68) 278P/McNaught Now it is 16.9 mag (Aug. 8, ATLAS-HKO, Haleakala). It became brighter than orignally predicted. It stays observable at 17 mag in good condition until autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 14 30.23 -19 54.4 2.289 2.090 65 17.4 19:59 ( 56, 11) Sept. 5 14 44.42 -21 1.4 2.350 2.088 62 17.4 19:47 ( 55, 10) C/2016 M1 ( PanSTARRS ) It brightened up to 7.7 mag in June in 2018 (June 19, Juan Jose Gonzalez). Now it is fading. It has already faded down to 16.9 mag (Apr. 22, J. Drummond). In the Southern Hemisphere, it stays observable for a long time until the comet will fade out. It will be observable in good condition after this also in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 6 36.43 -10 38.3 7.913 7.485 61 17.4 4:02 (296, 16) Sept. 5 6 37.90 -10 51.1 7.881 7.537 66 17.5 4:08 (302, 22) 312P/NEAT Now it is 18.7 mag (Aug. 17, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 17.5 mag in September. It is observable in excellent condition 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) Aug. 29 23 19.03 -16 12.9 0.999 1.995 166 17.5 0:50 ( 0, 39) Sept. 5 23 17.34 -18 31.6 0.994 1.990 167 17.5 0:21 ( 0, 37) 254P/McNaught Now it is 17.3 mag (Aug. 16, W. Hasubick). It stays 17.5 mag until November. It is observable in excellent condition in the Southern Hemisphere. It locates very low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 23 24.45 -30 58.9 2.197 3.142 155 17.5 0:56 ( 0, 24) Sept. 5 23 20.76 -32 22.4 2.204 3.140 153 17.5 0:25 ( 0, 23) 28P/Neujmin 1 Now it is 17.3 mag (Aug. 23, Slooh.com Chile Observatory, La Dehesa). It will brighten up to 15.5 mag in early 2021. In 2020, it stays observable at 17 mag until November in the Southern Hemisphere. In the Northern Hemisphere, it will be unobservable soon. Then it stays unobservable until 2021 June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 14 34.16 -29 5.1 2.851 2.681 70 17.6 19:59 ( 49, 5) Sept. 5 14 43.27 -29 22.4 2.879 2.626 65 17.6 19:47 ( 50, 4) 215P/NEAT Now it is 17.7 mag (Aug. 15, Toshihiko Ikemura, Hirohisa Sato). It was observed at 17 mag in 2019. In 2020, it is observable at 17.5 mag in good condition from summer to autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 0 59.73 -5 46.9 2.895 3.750 142 17.7 2:31 ( 0, 49) Sept. 5 0 56.97 -6 8.0 2.851 3.757 149 17.6 2:01 ( 0, 49) 173P/Mueller 5 It is observable at 17-18 mag for a long time from late 2019 to early 2021. It will fade out before it passes the perihelion. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 5 42.48 16 13.0 4.895 4.651 70 17.7 4:02 (281, 43) Sept. 5 5 47.00 16 16.6 4.782 4.640 75 17.7 4:08 (287, 49) P/2019 LD2 ( ATLAS ) Now it is 17.3 mag (Aug. 13, Toshihiko Ikemura, Hirohisa Sato). It stays 18 mag from 2019 to 2020. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 20 55.07 -7 22.7 3.654 4.597 156 17.8 22:23 ( 0, 48) Sept. 5 20 52.48 -7 50.3 3.702 4.599 149 17.8 21:53 ( 0, 47) 249P/LINEAR Now it is 17.0 mag (Aug. 23, A. Sonka). It was expected to brighten rapidly up to 9.5 mag in June. But actually, it was fainter than predicted. However, it became very bright as 7.5 mag in SOHO spacecraft images on June 19 (Karl Battams). It is 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) Aug. 29 6 34.22 23 51.0 1.432 1.240 58 17.8 4:02 (265, 37) Sept. 5 6 43.79 23 12.6 1.458 1.337 62 18.3 4:08 (269, 41) C/2020 O2 ( Amaral ) Now it is 18.0 mag (Aug. 5, L. S. Amaral). It will brighten up to 16.5 mag in 2021 summer. In the Southern Hemisphere, it stays observable for a while. In the Northern Hemisphere, it is not observable until 2021 February. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 14 41.84 -47 38.0 5.725 5.628 79 17.8 19:59 ( 35, -7) Sept. 5 14 47.44 -46 44.5 5.795 5.602 74 17.8 19:47 ( 37, -8) C/2019 E3 ( ATLAS ) It stays observable at 17 mag for a long time until 2027. In the Southern Hemipshere, it stays observable in good condition for a long time. It is not observable in the Northern Hemipsphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 9 51.63 -44 7.7 12.595 12.032 54 17.8 4:02 (303,-37) Sept. 5 9 53.92 -44 31.0 12.590 12.014 53 17.8 4:08 (305,-32) C/2017 K5 ( PanSTARRS ) Sam Deen pointed out that it brightened in outburst twice in 2017 and 2019. It was observed at 20-21 mag in 2017. Then it became fainter than 22.9 mag in 2018 summer (Aug. 29, Sam Deen). However, it brightened up to 17.2 mag in 2019 spring (Mar. 25, B. T. Bolin). Then it faded again down to 19.9 mag (May 29, Toshihiko Ikemura, Hirohisa Sato). Now it is 18.1 mag (July 9, J. Jahn). It is predicted to stay observable at 18 mag for a long time from 2019 to 2021. But actually, it may be fainter than this ephemeris. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 18 27.45 -25 34.2 7.182 7.741 120 17.8 19:59 ( 1, 29) Sept. 5 18 26.01 -26 1.6 7.294 7.747 113 17.8 19:47 ( 5, 29) P/2002 T5 ( LINEAR ) First return of a new periodic comet which brightened up to 16 mag from 2003 to 2004. Now it is 18.6 mag (Aug. 17, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 16 mag in winter between 2021 and 2022. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 3 9.35 -18 21.9 4.248 4.722 112 17.9 4:02 (349, 36) Sept. 5 3 10.47 -19 4.6 4.156 4.702 117 17.8 4:08 (358, 36) 178P/Hug-Bell Now it is 17.7 mag (Aug. 17, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17.5-18 mag in good condition until winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Aug. 29 6 0.24 16 37.5 2.094 1.919 65 17.9 4:02 (278, 40) Sept. 5 6 14.99 16 47.9 2.045 1.931 69 17.9 4:08 (281, 44)