Weekly Information about Bright Comets (2023 Sept. 2: North)

Japanese version Home page	Updated on September 4, 2023
Last week South Next week

Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere. Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

C/2023 P1 ( Nishimura ) Bright new comet. It will approach to Sun down to 0.22 a.u. in mid September, and it is expected to brighten up to 2 mag. Now it is 6.3 mag (Sept. 3, Virgilio Gonano). It will turn to fade out rapidly after brightening. In the Northern Hemisphere, it will be unobservable soon. In the Southern Hemisphere, it is not observable now, but it will appear in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 8 50.21 24 1.9 1.038 0.550 31 6.5 4:05 (250, 13) Sept. 9 10 16.26 22 52.8 0.867 0.372 21 4.4 4:11 (244, 3) 103P/Hartley 2 It is expected to brighten up to 7.5 mag in October. Now it is 11.0 mag (Aug. 27, Juan Jose Gonzalez). Brightening slowly. 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) Sept. 2 2 50.76 42 41.6 0.448 1.200 104 9.5 4:05 (184, 82) Sept. 9 3 45.91 42 57.5 0.416 1.160 100 9.0 4:11 (208, 81) C/2020 V2 ( ZTF ) Now it is 9.6 mag (Aug. 27, Juan Jose Gonzalez). Fading gradually. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 2 42.19 -12 18.4 1.924 2.592 120 9.6 4:00 ( 0, 43) Sept. 9 2 29.76 -17 8.5 1.876 2.632 129 9.6 3:21 ( 0, 38) C/2023 E1 ( ATLAS ) It brightened up to 8.4 mag in late July (July 22, Thomas Lehmann). Now it is 9.7 mag (Aug. 25, Chris Wyatt). Fading rapidly. It will be fainter than 18 mag in November. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 22 1.63 6 43.6 0.441 1.435 161 10.2 23:17 ( 0, 61) Sept. 9 22 7.45 -3 31.4 0.514 1.509 164 11.0 22:55 ( 0, 51) 2P/Encke It will brighten up to 7.5 mag in October. Now it is 11.1 mag (Aug. 27, Juan Jose Gonzalez). It will turn to fade out rapidly after brightening. It will be unobservable soon in the Southern Hemisphere, or in October in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 6 20.10 34 6.5 1.086 1.131 65 11.3 4:05 (255, 47) Sept. 9 7 11.70 33 26.1 0.995 1.019 61 10.3 4:11 (255, 43) C/2021 T4 ( Lemmon ) It brightened up to 7.8 mag in late July (July 20, Thomas Lehmann). Now it is 11.4 mag (Aug. 24, Ken-ichi Kadota). Fading rapidly. It will be unobservable in October. But it will be observable again in November in the Northern Hemisphere, or in December in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 14 53.87 -18 32.4 1.626 1.552 67 10.5 19:53 ( 54, 15) Sept. 9 14 51.87 -16 46.7 1.830 1.584 59 10.8 19:42 ( 59, 13) C/2021 S3 ( PanSTARRS ) It is expected to brighten up to 7 mag in early 2024. Now it is 12.7 mag (Aug. 21, Chris Wyatt). It will brighten rapidly after this. In the Northern Hemisphere, it is not observable now, but it will appear in November. It locates somewhat low in the Southern Hemisphere. But it will become high in winter. The brightness evolution slowed down since May. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 8 56.09 -28 6.7 3.259 2.635 44 11.8 4:05 (293,-17) Sept. 9 9 11.23 -29 3.8 3.179 2.561 44 11.6 4:11 (296,-14) C/2017 K2 ( PanSTARRS ) It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 11.8 mag (Aug. 24, Ken-ichi Kadota). It stays 12 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 6 45.87 -8 14.7 3.899 3.525 61 11.9 4:05 (295, 19) Sept. 9 6 48.13 -8 12.9 3.875 3.588 66 11.9 4:11 (301, 25) C/2022 A2 ( PanSTARRS ) It brightened up to 9.5 mag from winter to early spring (Jan. 30, Katsumi Yoshimoto). Now it is 12.2 mag (Aug. 29, Osamu Miyazaki). It will fade out rapidly after this. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 23 46.66 15 52.7 2.043 2.967 151 12.5 1:06 ( 0, 71) Sept. 9 23 34.49 12 32.5 2.062 3.031 160 12.7 0:26 ( 0, 68) 12P/Pons-Brooks It returns for the first time in 70 years. It will brighten up to 4.5 mag in 2024 spring. It suddenly brightened in outburst by 5 mag up to 11.5 mag on July 20 (E. Tamas, Francois Kugel). Now it is 11.7 mag (Aug. 26, Thomas Lehmann). Brightening slowly. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 17 24.38 51 59.1 3.276 3.427 89 12.8 19:53 (147, 68) Sept. 9 17 20.86 50 48.7 3.236 3.351 87 12.9 19:42 (140, 67) C/2019 U5 ( PanSTARRS ) Now it is 13.7 mag (July 14, Chris Wyatt). It stays 13 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in October. In the Southern Hemisphere, it will be unobservable soon. But it will be observable again in September. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 10 34.39 -15 50.6 4.785 3.886 24 13.0 4:05 (268,-31) Sept. 9 10 36.61 -17 1.4 4.809 3.909 23 13.0 4:11 (274,-25) C/2020 K1 ( PanSTARRS ) Now it is 13.6 mag (Aug. 25, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it is not observable now. It locates somewhat low in the Southern Hemisphere. But it will become high in autumn. It was expected to brighten up to 10 mag from spring to summer. However, it is fainter than originally expected. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 11 27.03 -75 17.1 3.227 3.275 83 13.4 19:53 ( 18,-38) Sept. 9 11 32.66 -74 59.3 3.308 3.299 80 13.5 19:42 ( 18,-39) C/2019 L3 ( ATLAS ) It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 13.2 mag (July 14, Chris Wyatt). It stays 14 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in November. It locates somewhat low in the Southern Hemisphere. But it will become high in autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 10 25.11 -33 50.8 6.960 6.250 42 13.5 4:05 (289,-37) Sept. 9 10 30.81 -34 32.7 7.019 6.295 41 13.5 4:11 (292,-32) 126P/IRAS Now it is 13.8 mag (Aug. 17, Ken-ichi Kadota). Fading gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable soon. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 2 43.53 46 23.4 1.303 1.826 103 13.7 4:02 (180, 79) Sept. 9 2 41.63 51 7.3 1.287 1.853 107 13.8 3:33 (180, 74) C/2021 X1 ( Maury-Attard ) Now it is 14.0 mag (Aug. 24, Hiroshi Abe). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 1 36.17 7 40.7 2.586 3.365 133 13.8 2:55 ( 0, 63) Sept. 9 1 20.51 7 29.3 2.514 3.384 144 13.8 2:12 ( 0, 63) C/2023 H2 ( Lemmon ) It will approach to Earth down to 0.2 a.u. in November, and it is expected to brighten up to 7.5 mag. Now it is 14.2 mag (Aug. 23, Thomas Lehmann). Brightening rapidly. It locates somewhat low in the Northern Hemisphere. But it will become high in autumn. In the Southern Hemisphere, it is not observable now, but it will appear in November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 11 41.61 43 20.6 1.990 1.338 37 14.3 19:53 (133, 14) Sept. 9 11 44.86 43 29.1 1.871 1.255 38 13.8 19:42 (135, 13) 237P/LINEAR Now it is 13.3 mag (Aug. 17, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in December. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 19 29.72 -0 31.3 1.365 2.170 131 14.0 20:45 ( 0, 54) Sept. 9 19 32.55 -1 1.1 1.440 2.191 126 14.3 20:20 ( 0, 54) C/2022 JK5 ( PanSTARRS ) The ATLAS search program detected its cometary activity in April. It continues to be brightening even after the perihelion passage. Now it is 13.4 mag (Aug. 25, Chris Wyatt). It will fade out rapidly after this. It locates somewhat low in the Northern Hemisphere. But it will become high in autumn. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 23 53.38 -27 22.8 2.029 2.972 154 14.0 1:12 ( 0, 28) Sept. 9 23 49.65 -27 29.4 2.054 3.002 155 14.1 0:41 ( 0, 28) 29P/Schwassmann-Wachmann 1 Now it is 13.3 mag (Aug. 22, Jean-Francois Soulier). In the Northern Hemisphere, it will be getting higher gradually. It locates somewhat low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 8 11.64 22 41.5 6.884 6.132 38 14.1 4:05 (256, 20) Sept. 9 8 16.39 22 24.6 6.811 6.134 44 14.1 4:11 (260, 25) C/2019 T4 ( ATLAS ) It brightened up to 11.1 mag in early 2022 (Mar. 31, 2022, F. Kugel, J.-G. Bosch, J. Nicolas). Now it is 14.2 mag (Aug. 17, Thomas Lehmann). It stays 15 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. But it will be getting higher again after December. In the Southern Hemisphere, it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 15 26.95 18 41.4 5.866 5.595 69 14.2 19:53 ( 82, 45) Sept. 9 15 30.87 18 15.6 5.977 5.631 65 14.3 19:42 ( 83, 42) C/2022 W3 ( Leonard ) Now it is 14.3 mag (Aug. 22, Thomas Lehmann). It will fade out rapidly after this. It will be fainter than 18 mag in November. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 19 3.48 -1 13.9 0.936 1.726 125 14.2 20:18 ( 0, 53) Sept. 9 18 55.50 -9 57.1 1.079 1.784 117 14.7 19:43 ( 0, 45) C/2022 E2 ( ATLAS ) Now it is 15.6 mag (July 8, Thomas Lehmann). Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will be observable soon. It locates somewhat low in the Southern Hemisphere. But it will become high in autumn. It is expected to brighten up to 12 mag from 2024 to 2025. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 9 27.16 3 37.4 5.874 4.933 19 14.7 4:05 (261, -6) Sept. 9 9 30.03 3 46.0 5.794 4.894 24 14.6 4:11 (266, 0) C/2022 L2 ( ATLAS ) Now it is 14.8 mag (Aug. 18, Ken-ichi Kadota). It stays 14 mag for a while. It will be getting lower gradually after this, and it will be unobservable in October in the Southern Hemisphere, or in November in the Northern Hemisphere. But it will be observable again in December. It is expected to brighten up to 12.5 mag in 2024 spring. At the high light, it will be observable in excellent condition in the Southern Hemisphere, but it will be low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 15 11.13 5 36.4 3.608 3.340 66 14.7 19:53 ( 71, 34) Sept. 9 15 9.14 3 59.9 3.683 3.300 60 14.7 19:42 ( 72, 29) C/2021 Y1 ( ATLAS ) Now it is 14.3 mag (July 7, Thomas Lehmann). Fading slowly. In the Northern Hemisphere, it is not observable now. It stays extremely low in the Southern Hemisphere. But it will become high in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 11 8.71 -48 29.2 2.911 2.509 56 14.8 19:53 ( 52,-39) Sept. 9 11 32.93 -48 51.6 3.002 2.556 54 14.9 19:42 ( 52,-38) C/2023 K1 ( ATLAS ) It brightened very rapidly. Now it is 15.2 mag (Aug. 23, ATLAS South Africa). It will fade out rapidly after this. It will be fainter than 18 mag in December. In the Northern Hemisphere, it is not observable now, but it will appear in November. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 13 58.06 -27 18.0 2.364 2.041 59 14.9 19:53 ( 57, -1) Sept. 9 14 1.50 -24 55.5 2.496 2.040 52 15.0 19:42 ( 60, -1) 185P/Petriew It was expected to brighten up to 11 mag in July. But actually, it is fainter than originally expected. Now it is 13.0 mag (Aug. 19, Thomas Lehmann). Fading rapidly. It will be fainter than 18 mag in October. It locates somewhat low. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 8 23.93 11 13.8 1.877 1.187 34 14.9 4:05 (264, 11) Sept. 9 8 44.74 9 17.9 1.920 1.247 35 15.4 4:11 (268, 13) 199P/Shoemaker 4 Now it is 14.6 mag (Aug. 5, J. L. Virlichie, P. Traverse, H. Roy, G. Houdin). Fading slowly. 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) Sept. 2 17 58.44 -32 30.1 2.406 2.916 110 15.0 19:53 ( 9, 22) Sept. 9 18 2.82 -32 58.7 2.497 2.920 104 15.1 19:42 ( 11, 21) C/2022 E3 ( ZTF ) It approached to Earth down to 0.29 a.u. in early February, and it brightened up to 4.5 mag (Feb. 1, Juan Jose Gonzalez). Now it is 14.1 mag (Aug. 19, Thomas Lehmann). Fading slowly. In the Northern Hemisphere, it will be unobservable in October. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 6 39.41 -38 19.9 3.544 3.390 73 15.1 4:05 (318, -1) Sept. 9 6 40.05 -40 45.0 3.559 3.466 76 15.2 4:11 (325, 2) C/2021 G2 ( ATLAS ) It will brighten up to 14 mag from 2024 to 2025. Now it is 15.2 mag (July 22, ATLAS Chile). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in November. It locates somewhat low in the Southern Hemisphere. But it will become high in autumn. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 10 26.69 -27 40.7 6.520 5.735 36 15.2 4:05 (282,-35) Sept. 9 10 33.73 -28 1.0 6.510 5.710 34 15.1 4:11 (285,-30) 213P/Van Ness It has not been observed yet in this apparition. It was expected to brighten rapidly up to 15 mag in summer. But actually, it is not detected, fainter than 19 mag (Aug. 12, Martin Masek). It stays 16 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) Sept. 2 17 12.75 -28 10.5 1.614 2.054 100 15.3 19:53 ( 20, 24) Sept. 9 17 22.90 -27 33.5 1.672 2.041 95 15.3 19:42 ( 22, 24) 71P/Clark It brightened up to 12.8 mag in spring (Mar. 8, Taras Prystavski). Now it is 15.9 mag (Aug. 18, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in November. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 1 29.69 -3 21.8 1.640 2.484 138 15.6 2:48 ( 0, 52) Sept. 9 1 25.22 -3 51.5 1.626 2.523 145 15.7 2:16 ( 0, 51) 81P/Wild 2 Now it is 14.6 mag (Aug. 17, Thomas Lehmann). Fading gradually. It will be fainter than 18 mag in December. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 17 13.94 -20 49.5 2.415 2.778 100 15.7 19:53 ( 23, 31) Sept. 9 17 20.13 -21 5.2 2.547 2.819 94 15.9 19:42 ( 25, 30) 117P/Helin-Roman-Alu 1 Now it is 15.7 mag (Aug. 24, Thomas Lehmann). Fading slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 0 42.39 -6 21.9 2.705 3.616 150 15.8 2:01 ( 0, 49) Sept. 9 0 38.74 -6 47.2 2.681 3.631 157 15.8 1:30 ( 0, 48) C/2023 A3 ( Tsuchinshan-ATLAS ) It will approach to Sun down to 0.4 a.u. in late September in 2024, and it is expected to brighten up to 0 mag. Now it is 15.9 mag (Aug. 13, ATLAS South Africa). Brightening slowly. It will be unobservable in October. But it will be observable again in November in the Northern Hemisphere, or in December in the Southern Hemisphere. At the high light, in the Northern Hemisphere, it will be observable in good condition after the perihelion passage. In the Southern Hemisphere, it will be observable in the low sky before and after the perihelion passage. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 14 5.40 0 7.3 6.103 5.527 51 15.9 19:53 ( 77, 18) Sept. 9 14 7.04 -0 21.2 6.120 5.457 45 15.8 19:42 ( 79, 15) C/2014 UN271 ( Bernardinelli-Bernstein ) Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.7 mag (Aug. 19, Thomas Lehmann). It stays 16 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) Sept. 2 3 33.85 -62 36.4 16.986 17.277 105 16.3 4:05 (355, -8) Sept. 9 3 33.56 -63 4.1 16.956 17.252 105 16.3 4:11 (359, -8) 77P/Longmore Now it is 16.1 mag (Aug. 26, ATLAS South Africa). Fading slowly. It will be fainter than 18 mag in November. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting lower gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 14 47.84 -37 45.0 2.648 2.549 73 16.3 19:53 ( 42, 0) Sept. 9 15 0.68 -38 20.2 2.738 2.566 69 16.4 19:42 ( 42, -1) C/2022 A3 ( Lemmon-ATLAS ) Now it is 16.5 mag (Apr. 10, Michael Jager). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in October. In the Southern Hemisphere, it will be getting higher gradually. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 9 13.24 -25 55.1 4.422 3.711 40 16.4 4:05 (289,-20) Sept. 9 9 17.70 -27 46.4 4.386 3.708 42 16.4 4:11 (294,-15) C/2022 S4 ( Lemmon ) It is expected to brighten up to 14 mag in 2024 summer. At the high light, it is not observable in the Northern Hemisphere. Now it is 17.1 mag (Aug. 27, ATLAS Chile). Brightening slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 3 31.58 0 12.8 3.791 4.206 107 16.6 4:05 (341, 54) Sept. 9 3 30.55 -1 31.2 3.640 4.157 114 16.5 4:11 (356, 54) 32P/Comas Sola It is expected to brighten up to 14.5 mag in winter. Now it is 17.8 mag (Aug. 3, Ken-ichi Kadota). Brightening slowly. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 3 22.64 13 43.9 2.349 2.816 107 16.8 4:05 (337, 67) Sept. 9 3 26.58 14 6.4 2.229 2.779 112 16.6 4:11 (356, 69) 219P/LINEAR Now it is 16.9 mag (Aug. 24, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in December. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 17 47.68 -11 15.0 2.098 2.588 107 16.6 19:53 ( 17, 42) Sept. 9 17 52.04 -11 30.0 2.164 2.570 101 16.7 19:42 ( 20, 41) 322P/SOHO It approached to Sun down to 0.05 a.u. on Aug. 21, and it must have brightened up to 5.5 mag. Fading rapidly. It will be fainter than 18 mag soon. It will never be observable after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 11 22.36 2 23.8 1.461 0.514 11 16.7 19:53 (102,-14) Sept. 9 11 54.33 -1 55.2 1.644 0.709 13 18.5 19:42 ( 97,-13) C/2019 E3 ( ATLAS ) Very far object. Now it is 17.0 mag (Aug. 26, Jean-Claude Merlin). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 5 48.53 -71 45.4 10.224 10.321 92 16.8 4:05 (346,-21) Sept. 9 5 46.86 -72 27.1 10.228 10.319 92 16.8 4:11 (349,-20) C/2020 Y2 ( ATLAS ) It brightened up to 14.1 mag in 2022 spring (Mar. 22, 2022, Chris Wyatt). It was expected to brighten up to 13 mag. But actually, it was fainter than originally expected. Now it is 16.5 mag (Aug. 17, Thomas Lehmann). 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) Sept. 2 2 54.02 -2 33.6 4.585 5.124 117 16.9 4:05 (357, 52) Sept. 9 2 49.39 -2 34.6 4.532 5.171 124 16.9 3:40 ( 0, 53) (3200) Phaethon It will brighten rapidly after this. It will be unobservable in October. But it will be observable again in November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 7 49.63 23 11.1 1.650 1.159 43 17.2 4:05 (258, 24) Sept. 9 8 18.50 20 58.8 1.515 1.050 43 16.9 4:11 (261, 24) C/2020 R7 ( ATLAS ) It brightened up to 13.4 mag in last summer (July 7, 2022, Giuseppe Pappa). Now it is 17.2 mag (Aug. 25, ATLAS-HKO, Haleakala). 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 November. In the Southern Hemisphere, it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 15 19.50 30 57.8 4.752 4.475 68 17.0 19:53 ( 99, 49) Sept. 9 15 20.35 30 32.2 4.869 4.522 64 17.1 19:42 (100, 45) 339P/Gibbs It has not been observed yet in this apparition. It tends to brighten after the perihelion passage. It will fade out rapidly after this. It will be fainter than 18 mag in November. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be unobservable in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 12 15.72 0 9.5 2.198 1.348 24 17.3 19:53 ( 93, -4) Sept. 9 12 38.75 -2 0.2 2.209 1.352 24 17.0 19:42 ( 90, -4) C/2021 S4 ( Tsuchinshan ) Now it is 17.5 mag (Aug. 26, ATLAS-HKO, Haleakala). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 4 53.11 38 4.7 6.788 6.737 82 17.1 4:05 (254, 64) Sept. 9 4 56.01 38 28.4 6.678 6.731 88 17.0 4:11 (253, 71) P/2023 M4 ( ATLAS ) Now it is 16.4 mag (Aug. 10, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in October. It stays observable in good condition. It was very faint as 21.5 mag in 2021. It seems to be bright temporarily in outburst. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 21 15.41 -11 27.6 3.554 4.507 158 17.1 22:30 ( 0, 44) Sept. 9 21 12.41 -11 38.0 3.614 4.521 150 17.2 22:00 ( 0, 43) C/2023 F3 ( ATLAS ) Now it is 16.9 mag (Aug. 6, Jean-Claude Merlin). It stays 17 mag for a while. It will be unobservable in October in the Northern Hemisphere, or in November in the Southern Hemisphere. But it will be observable again in December in the Southern Hemisphere. It stays 16 mag in the Southern sky for a long time from 2024 to 2025. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 16 28.87 -40 4.8 6.337 6.464 92 17.1 19:53 ( 24, 9) Sept. 9 16 26.42 -39 54.7 6.429 6.434 85 17.1 19:42 ( 28, 8) C/2022 QE78 ( ATLAS ) Now it is 16.7 mag (Aug. 28, Ken-ichi Kadota). 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) Sept. 2 4 55.03 -9 57.4 7.563 7.601 88 17.2 4:05 (320, 36) Sept. 9 4 56.69 -10 14.2 7.437 7.568 93 17.1 4:11 (329, 39) 465P/2023 L1 ( Hill ) First return of a new periodic comet which brightened up to 15 mag in 2008. Now it is 17.4 mag (Aug. 3, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in November. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 3 54.10 20 33.7 2.187 2.537 98 17.4 4:05 (310, 69) Sept. 9 3 59.70 19 44.4 2.125 2.561 103 17.4 4:11 (328, 73) 226P/Pigott-LINEAR-Kowalski It is expected to brighten up to 15 mag from autumn to winter. Now it is 18.7 mag (Aug. 11, Giuseppe Pappa). Brightening gradually. In the Northern Hemisphere, it is not observable now, but it will appear in October. In the Southern Hemisphere, it stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 3 0.06 -57 24.4 1.486 2.068 110 17.8 4:05 (358, -2) Sept. 9 2 56.62 -58 10.2 1.439 2.037 111 17.5 3:47 ( 0, -3) 170P/Christensen Now it is 17.3 mag (Aug. 27, ATLAS Chile). 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) Sept. 2 3 50.23 8 40.9 2.650 3.017 101 17.6 4:05 (327, 60) Sept. 9 3 54.00 8 25.0 2.571 3.027 107 17.6 4:11 (342, 62) C/2022 U1 ( Leonard ) Now it is 17.9 mag (Aug. 28, 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 is not observable now, but it will appear in November. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 2 26.24 55 6.3 4.228 4.539 101 17.7 3:45 (180, 70) Sept. 9 2 13.41 56 15.0 4.112 4.517 107 17.6 3:05 (180, 69) C/2022 U4 ( Bok ) Now it is 17.6 mag (Aug. 7, Hirohisa Sato). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 14 56.44 30 39.8 3.227 2.913 63 17.7 19:53 (101, 44) Sept. 9 15 8.04 28 38.9 3.270 2.921 61 17.7 19:42 ( 99, 42) 62P/Tsuchinshan 1 It has not been observed yet in this apparition. It is expected to brighten up to 7 mag, and it will be observable in good condition in winter. Brightening rapidly. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. But it will become high in winter. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 4 44.93 19 32.0 1.564 1.811 86 18.2 4:05 (293, 60) Sept. 9 5 2.61 20 9.7 1.457 1.760 89 17.7 4:11 (297, 63) C/2022 U3 ( Bok ) Now it is 18.8 mag (Feb. 17, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It stays extremely low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 4 57.08 39 6.1 5.513 5.464 81 17.8 4:05 (251, 64) Sept. 9 5 0.91 39 8.5 5.386 5.440 87 17.7 4:11 (251, 70) 287P/Christensen Now it is 18.0 mag (July 28, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag in October. It stays observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 22 59.02 -15 57.7 2.048 3.049 171 17.8 0:18 ( 0, 39) Sept. 9 22 55.14 -16 55.7 2.059 3.052 168 17.8 23:42 ( 0, 38) 246P/NEAT It brightened up to 14 mag from 2020 to 2021. Now it is 17.9 mag (Aug. 24, W. Hasubick). 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) Sept. 2 3 9.97 4 41.6 4.223 4.695 112 18.0 4:05 (349, 59) Sept. 9 3 9.65 4 30.6 4.139 4.707 118 17.9 4:00 ( 0, 60) 2023 KF3 David Rankin detected its cometary activity in June. Now it is 16.4 mag (Aug. 17, Martin Masek). Fading slowly. It stays observable in good condition. It is brighter than this ephemeris recently. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 22 17.87 -3 22.3 1.347 2.350 172 18.0 23:32 ( 0, 52) Sept. 9 22 13.75 -3 33.7 1.333 2.324 166 18.1 23:01 ( 0, 52) 13P/Olbers It returned for the first time in 68 years. It will brighten up to 7.5 mag in 2024 summer. Now it is 21.0 mag (Aug. 26, Alan Hale). It will brighten rapidly after this. It stays observable in good condition. At the high light, it locates low in the Northern Hemisphere, or it is not observable in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) Sept. 2 4 23.94 -15 30.4 3.682 3.927 96 20.4 4:05 (331, 35) Sept. 9 4 26.14 -16 3.9 3.532 3.861 101 20.1 4:11 (340, 37)