Weekly Information about Bright Comets (2026 Sept. 12: North)

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Updated on September 15, 2026
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* 10P/Tempel 2

Now it is 7.7 mag (Sept. 7, Juan Jose Gonzalez). 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.12  22 29.99  -35 13.7   0.532   1.481   147    8.9  23:05 (  0, 20)  
Sept.19  22 36.05  -35  3.2   0.574   1.504   143    9.2  22:44 (  0, 20)  

* 169P/NEAT

It approached to Earth down to 0.17 a.u. mid August. Now it is 11.0 mag (Sept. 9, Mike Olason). It will fade out rapidly after this. It will be fainter than 18 mag in November. It locates somewhat low in the Northern Hemisphere. It stays extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   9 32.17   11  4.8   0.465   0.631    27   10.1   4:14 (261,  7)  
Sept.19   9 33.70    8  3.9   0.585   0.606    33   10.3   4:20 (269, 12)  

* 220P/McNaught

Major outburst of about 9 mag occured from May 31 to June 1, and it brightened up to 8.3 mag (June 3, Marco Goiato). Another major outburst occued on Aug. 5 and it brightened up to 6.4 mag (Aug. 6, Taras Prystavski). Now it is 11.5 mag (Sept. 4, 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.12   3 27.99    8  3.9   1.082   1.778   116   10.9   4:06 (  0, 63)  
Sept.19   3 31.57    7 21.1   1.058   1.809   122   11.6   3:42 (  0, 62)  

* 161P/Hartley-IRAS

It is expected to brighten up 10 mag from autumn to winter, and it will be observable in good condition. Now it is 11.5 mag (Sept. 9, Michael Jager). Brightening slowly. 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 November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   2 11.31  -16 54.2   0.753   1.634   136   12.3   2:50 (  0, 38)  
Sept.19   1 26.37  -14 53.4   0.620   1.578   151   11.6   1:39 (  0, 40)  

* C/2024 T5 ( ATLAS )

Now it is 12.9 mag (Sept. 3, Jean-Gabriel Bosch). It stays 13 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   5 37.99  -13  5.6   4.300   4.354    86   13.1   4:14 (324, 34)  
Sept.19   5 41.04  -13 12.7   4.188   4.327    91   13.0   4:20 (332, 37)  

* 260P/McNaught

Now it is 13.7 mag (Aug. 24, Hiroshi Abe). It will fade out rapidly after this. 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.12   5  0.57   37 45.5   1.069   1.480    90   13.1   4:14 (255, 73)  
Sept.19   5 18.22   39 45.3   1.053   1.504    93   13.2   4:20 (246, 76)  

* 88P/Howell

It brightened up to 9.6 mag in the very low sky in spring (Apr. 14, Chris Wyatt). Now it is 13.0 mag (Aug. 24, Hiroshi Abe). 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.12   3 17.21   15  2.3   1.570   2.227   117   13.1   3:55 (  0, 70)  
Sept.19   3 15.64   15  1.0   1.541   2.273   125   13.3   3:26 (  0, 70)  

* 78P/Gehrels 2

Now it is 13.5 mag (Aug. 16, Ken-ichi Kadota). It stays 14 mag for a while. In the Northern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   6 48.30   18 52.8   2.275   2.106    67   13.3   4:14 (278, 45)  
Sept.19   7  1.00   18 16.2   2.222   2.124    71   13.3   4:20 (283, 49)  

* C/2024 J3 ( ATLAS )

Now it is 13.4 mag (Aug. 24, Purple Mountain Observatory, XuYi Station). It stays 14 mag for a while. 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.12  18 30.91   42 59.0   3.619   3.920    99   13.5  19:37 (145, 80)  
Sept.19  18 27.97   42 39.0   3.661   3.910    96   13.6  19:26 (131, 77)  

* C/2026 A2 ( Bok )

Now it is 14.5 mag (Sept. 7, Toru Yusa). Brightening slowly. 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.12  16 54.40   73 13.7   2.171   2.296    84   14.4  19:37 (167, 49)  
Sept.19  17 16.58   71 51.0   2.083   2.253    86   14.2  19:26 (166, 50)  

* 29P/Schwassmann-Wachmann 1

Now it is 13.6 mag (Aug. 2, Andrew Pearce). Now it is not observable. It will appear in October in the Northern Hemisphere, or in November in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  11 51.33   -5 49.4   7.295   6.318    13   14.3  19:37 ( 95,-18)  
Sept.19  11 56.06   -6 21.9   7.310   6.318     8   14.3  19:26 ( 97,-21)  

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. Now it is 13.9 mag (Aug. 16, Thomas Lehmann). It stays 14 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.12   7 22.94  -70 34.0  13.689  13.627    84   14.5   4:14 (343,-23)  
Sept.19   7 27.77  -70 58.7  13.685  13.607    83   14.5   4:20 (345,-22)  

* C/2023 R1 ( PanSTARRS )

Now it is 14.7 mag (Sept. 7, Andrew Pearce). It stays 15 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  15 28.43  -16  3.6   4.142   3.825    64   14.5  19:37 ( 54, 18)  
Sept.19  15 27.46  -16 40.2   4.285   3.848    58   14.6  19:26 ( 57, 15)  

* C/2024 R4 ( PanSTARRS )

Now it is 14.4 mag (Sept. 5, Alfons Diepvens). It stays 14 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  20 19.90   49  1.3   5.016   5.502   113   14.6  20:54 (180, 76)  
Sept.19  20 11.28   48 29.3   5.014   5.470   111   14.6  20:18 (180, 76)  

* 123P/West-Hartley

Now it is 16.9 mag (May 17, Kunihiro Shima). It stays 15 mag for a while. In the Northern Hemisphere, it will be unobservable soon. But it will be observable again in September. 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.12  10 38.34   19 51.8   3.092   2.160    18   15.0   4:14 (245, -1)  
Sept.19  10 53.68   18 19.8   3.069   2.159    20   15.0   4:20 (249,  2)  

* 63P/Wild 1

Now it is 13.8 mag (Aug. 2, Thomas Lehmann). 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 December. In the Southern Hemisphere, it will be unobservable temporarily in December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  12 18.03   -6 34.5   3.015   2.084    18   15.0  19:37 ( 90,-13)  
Sept.19  12 32.12   -8 44.8   3.055   2.106    15   15.1  19:26 ( 89,-14)  

* 252P/LINEAR

It has not been observed yet in this apparition. It has brightened up to 4 mag in 2016, and 10 mag in 2021. Brightening rapidly. It stays extremely low in the Northern Hemisphere. 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.12   9 13.79    9 21.1   2.009   1.265    31   15.8   4:14 (266, 10)  
Sept.19   9 40.50    7 26.4   1.952   1.212    31   15.2   4:20 (268, 10)  

* C/2022 QE78 ( ATLAS )

Now it is 15.5 mag (June 14, Alfons Diepvens). It stays 16 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now, but it will appear in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  10 53.89   27  3.3   6.998   6.088    23   15.6   4:14 (237,  1)  
Sept.19  11  0.27   26 50.0   6.986   6.110    27   15.6   4:20 (241,  6)  

* 112P/Urata-Niijima

Now it is 17.4 mag (Aug. 30, ATLAS-MLO, Mauna Loa). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   5 54.01   30 24.8   1.221   1.445    80   15.9   4:14 (269, 61)  
Sept.19   6 18.16   32 59.0   1.184   1.442    81   15.7   4:20 (265, 64)  

* C/2022 N2 ( PanSTARRS )

Now it is 15.9 mag (Sept. 1, ATLAS-HKO, Haleakala). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   7 13.65   25 53.6   5.561   5.172    62   15.9   4:14 (266, 43)  
Sept.19   7 18.43   25 46.2   5.501   5.211    68   15.9   4:20 (270, 49)  

* C/2025 Y1 ( ATLAS )

Now it is 16.1 mag (Aug. 5, Ken-ichi Kadota). Brightening slowly. It will be unobservable soon. 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.12  13 23.55   -0 15.9   5.559   4.729    31   16.0  19:37 ( 86,  4)  
Sept.19  13 29.66   -0 50.5   5.555   4.677    26   15.9  19:26 ( 88,  2)  

* C/2025 M2 ( PanSTARRS )

It is expected to brighten up to 12 mag from 2027 to 2028. Now it is 15.9 mag (Aug. 28, Jean-Claude Merlin). It stays 16 mag for a while. 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.12  18 59.56  -21 14.8   4.536   5.044   114   16.0  19:37 (  1, 34)  
Sept.19  18 53.91  -21 20.0   4.609   4.993   106   16.0  19:26 (  7, 33)  

* C/2021 G2 ( ATLAS )

Now it is 15.8 mag (Aug. 25, Toru Yusa). 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 December. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  17  1.56   13 47.5   7.390   7.366    84   16.1  19:37 ( 59, 56)  
Sept.19  17  3.49   13 27.4   7.515   7.402    79   16.1  19:26 ( 63, 53)  

* 114P/Wiseman-Skiff

Now it is 16.5 mag (Aug. 24, Ken-ichi Kadota). Fading slowly. In the Northern Hemisphere, it stays observable in good condition. 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.12   7 45.58   23 34.5   1.918   1.571    54   16.3   4:14 (264, 35)  
Sept.19   8  5.40   21 34.0   1.878   1.571    56   16.3   4:20 (268, 37)  

* C/2025 R3 ( PanSTARRS )

It brightened up to 4.0 mag in late April (Apr. 30, Chris Wyatt). It brightened up to 1.3 mag due to the forward scattering in the SOHO LASCO images (Apr. 25, Mikolaj Kaszczyk). Now it is 13.4 mag (Aug. 15, Thomas Lehmann). Fading gradually. It will be fainter than 18 mag in November. 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.12   7 37.66  -21 56.5   2.981   2.630    60   16.3   4:14 (305,  9)  
Sept.19   7 36.63  -23 19.5   2.990   2.724    65   16.5   4:20 (312, 14)  

* 84P/Giclas

Now it is 16.3 mag (Aug. 21, Andrew Pearce). 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.12  20 15.60  -26 17.5   1.409   2.204   131   16.7  20:51 (  0, 29)  
Sept.19  20 15.26  -26 27.9   1.439   2.169   124   16.6  20:23 (  0, 29)  

* 65P/Gunn

Now it is 17.9 mag (Aug. 13, Andrew Pearce). Fading slowly. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   0 41.96   -7 22.2   2.628   3.587   159   16.6   1:20 (  0, 48)  
Sept.19   0 37.53   -7 48.4   2.621   3.603   165   16.7   0:48 (  0, 47)  

* C/2025 J1 ( Borisov )

Now it is 17.3 mag (Aug. 14, P.-J. Dekelver). 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 higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   7 13.11   17 35.6   4.048   3.677    61   16.7   4:14 (275, 39)  
Sept.19   7 14.76   16  7.9   3.952   3.691    67   16.7   4:20 (283, 45)  

* C/2026 AZ17 ( Bok )

Now it is 16.7 mag (Sept. 5, Alfons Diepvens). 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.12  16 55.80    8 50.0   2.502   2.590    83   16.7  19:37 ( 55, 51)  
Sept.19  17  4.75    6 49.6   2.546   2.569    79   16.7  19:26 ( 55, 48)  

* C/2025 E1 ( PanSTARRS )

Now it is 17.2 mag (June 2, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it will never be observable after this. 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.12  10 53.78  -72  9.4   4.110   3.999    76   17.1   4:14 (338,-39)  
Sept.19  11 14.57  -73 39.7   4.130   3.998    75   17.1   4:20 (340,-38)  

* C/2024 G6 ( ATLAS )

Now it is 16.9 mag (Aug. 22, Alfons Diepvens). It stays 17 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in winter. 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.12  15  7.27   15 16.2   7.069   6.576    57   17.1  19:37 ( 85, 34)  
Sept.19  15  8.58   15 12.0   7.155   6.586    52   17.1  19:26 ( 87, 31)  

* 493P/2024 Q2 ( LONEOS )

Now it is 17.6 mag (May 18, Kunihiro Shima). It stays 17 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now, but it will appear in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   9 22.90   33 45.9   4.803   4.082    39   17.2   4:14 (243, 21)  
Sept.19   9 31.47   33 12.6   4.755   4.096    44   17.1   4:20 (246, 25)  

* C/2022 E2 ( ATLAS )

It was observed at 12-13 mag for a long time in 2024. Now it is 17.3 mag (Sept. 5, Toru Yusa). Fading slowly. It will be fainter than 18 mag in November. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  22  9.80   28  5.0   6.234   7.069   143   17.3  22:44 (  0, 83)  
Sept.19  22  4.62   27  9.2   6.290   7.113   142   17.3  22:11 (  0, 82)  

* C/2024 G4 ( PanSTARRS )

Now it is 17.2 mag (Aug. 12, 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.12  20  0.25   -3 39.9   4.373   5.084   130   17.3  20:35 (  0, 51)  
Sept.19  20  0.54   -4 27.6   4.467   5.098   124   17.3  20:08 (  0, 51)  

* 93P/Lovas 1

Fading slowly. It will be fainter than 18 mag in November. In the Northern Hemisphere, it will be getting higher gradually. 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.12   9 15.18   22  9.8   2.890   2.142    34   17.3   4:14 (254, 17)  
Sept.19   9 28.85   20 57.2   2.882   2.183    38   17.4   4:20 (258, 20)  

* C/2019 E3 ( ATLAS )

Very far object. It stays 18 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   0 18.57  -45 22.1  10.912  11.669   137   17.4   0:57 (  0, 10)  
Sept.19   0 14.77  -45 23.8  10.944  11.686   135   17.4   0:26 (  0, 10)  

* P/2018 VN2 = P/2026 M2 ( Leonard )

First return of a new periodic comet which was observed at 18 mag in 2018. Now it is 17.2 mag (Sept. 5, ATLAS-MLO, Mauna Loa). Fading slowly. It will be fainter than 18 mag in December. In the Northern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   2  3.97   28  3.4   1.351   2.131   128   17.4   2:42 (  0, 83)  
Sept.19   2  5.44   27 28.8   1.304   2.138   135   17.4   2:16 (  0, 83)  

* 235P/LINEAR

It became brighter than expected. It was observed at 13 mag from winter to spring. Now it is 17.2 mag (Aug. 30, ATLAS South Africa). Fading gradually. It will be fainter than 18 mag in October. 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.12  17  9.84  -12 37.9   2.593   2.760    88   17.4  19:37 ( 34, 35)  
Sept.19  17 17.55  -13  5.3   2.713   2.791    83   17.6  19:26 ( 36, 34)  

* P/2021 N1 = P/2026 M1 ( ZTF )

First return of a new periodic comet which brightened up to 17 mag in 2021. It approached to Earth down to 0.17 a.u. from June to July. It brightened up to 15.2 mag (July 14, Andrew Pearce). Now it is 17.4 mag (Sept. 7, Toru Yusa). It will fade out rapidly after this. It will be fainter than 18 mag in October. 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.12   4 57.45   46  7.7   0.563   1.158    90   17.4   4:14 (228, 71)  
Sept.19   5  3.67   46 57.3   0.586   1.212    95   17.6   4:20 (216, 74)  

* 2P/Encke

It will brighten up to 6-7 mag from January to February. Now it is 17.2 mag (Aug. 24, Hidenori Nohara). It will brighten rapidly after this. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12   1 20.50   20 22.6   1.464   2.335   141   17.7   1:59 (  0, 76)  
Sept.19   1 11.66   20 29.2   1.347   2.269   149   17.4   1:23 (  0, 76)  

* 188P/LINEAR-Mueller

Now it is 17.9 mag (Aug. 24, W. Hasubick). It stays 18 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.12   5 52.78   33 17.0   2.729   2.749    80   17.6   4:14 (264, 62)  
Sept.19   6  1.31   33 44.5   2.658   2.767    85   17.5   4:20 (265, 67)  

* C/2025 B2 ( Borisov )

Now it is 17.3 mag (Sept. 4, ATLAS-MLO, Mauna Loa). It stays 18 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  16 37.90   78  5.0   8.290   8.239    83   17.6  19:37 (170, 44)  
Sept.19  16 42.87   76 53.4   8.267   8.239    84   17.6  19:26 (168, 45)  

* C/2023 X2 ( Lemmon )

Now it is 17.8 mag (July 6, ATLAS-MLO, Mauna Loa). It stays 18 mag for a while. In the Southern Hemisphere, it will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Sept.12  14 35.77   59 23.4   5.772   5.450    66   17.6  19:37 (141, 41)  
Sept.19  14 43.65   57 50.1   5.795   5.469    66   17.7  19:26 (139, 40)  

* 11P/Tempel-Swift-LINEAR

Now it is 18.2 mag (Sept. 5, Katsumi Yoshimoto). It will brighten rapidly after this. In the Northern Hemisphere, it stays observable in good condition. 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.12   1 26.87   37 56.1   0.686   1.530   128   18.0   2:05 (180, 87)  
Sept.19   1 37.73   38 58.3   0.631   1.500   131   17.8   1:48 (180, 86)  

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