Weekly Information about Bright Comets (2024 Oct. 5: North)

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Updated on October 9, 2024
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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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* C/2023 A3 ( Tsuchinshan-ATLAS )

Now it is very bright as 0.8 mag (Oct. 5, Chris Wyatt). It has a long tail of 10-20 degrees. It will be unobservable soon. But it will be observable again in mid October. J. N. Marcus predicted the comet will brighten up to -4 mag at best on Oct. 9 due to the forward scattering. Hirohisa Sato reported the comet is between -2 and -3 mag in the SOHO LASCO images and STEREO spacecraft images.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  11 42.84   -4 51.8   0.614   0.438    15    0.8   5:03 (277,  1)  
Oct. 12  13 52.89   -1 28.2   0.473   0.545    12    1.1  18:23 ( 87,  2)  

* 13P/Olbers

It returned for the first time in 68 years. It brightened up to 6.2 mag in early summer (July 1, Virgilio Gonano). Now it is 9.3 mag (Sept. 25, Virgilio Gonano). It will fade out rapidly after this. It will be unobservable in January in the Southern Hemisphere, or in November in the Northern Hemisphere. But it will be observable again in January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  14 48.95    3 22.5   2.601   1.835    32    9.9  19:02 ( 85, 12)  
Oct. 12  15  4.56    0 51.5   2.707   1.907    29   10.3  18:52 ( 84, 10)  

* C/2024 S1 ( ATLAS )

Bright new Kreutz sungrazer comet. It will approach to Sun down to 0.008 a.u. on Oct. 28. It is expected to brighten up to 2 mag, or -4.5 mag at best. Now it is 11.8 mag (Sept. 30, Chris Wyatt). It brightens up to 2 mag, but it will turn to fade out rapidly after that. It will be unobservable soon. But it will be observable again in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   9 40.91  -14  4.2   1.226   0.894    45   12.1   4:34 (298, 13)  
Oct. 12  10 29.27  -16 39.6   1.048   0.704    40   10.9   4:39 (297,  9)  

* 12P/Pons-Brooks

It returns for the first time in 70 years. It brightened up to 3.7 mag in early April (Apr. 6, Jose Guilherme Aguiar). Now it is 11.3 mag (Sept. 23, Jose Guilherme Aguiar). Fading gradually. 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)  
Oct.  5  13 55.95  -47 31.7   3.292   2.688    45   11.8  19:02 ( 48,-25)  
Oct. 12  14 12.26  -47 31.2   3.426   2.771    42   12.0  18:52 ( 48,-26)  

* C/2022 E2 ( ATLAS )

Now it is 12.6 mag (Sept. 30, Hiroshi Abe). It stays 12 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   7 33.90   51 57.3   3.601   3.671    86   12.0   4:34 (223, 62)  
Oct. 12   7 29.28   54  4.2   3.484   3.675    93   12.0   4:39 (212, 66)  

* C/2023 C2 ( ATLAS )

Now it is 13.0 mag (Sept. 20, Taras Prystavski). It stays 13 mag for a while. It will be unobservable in January 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)  
Oct.  5  17 32.53  -36 36.9   2.513   2.416    72   12.8  19:02 ( 29, 11)  
Oct. 12  17 45.34  -34 31.4   2.580   2.402    68   12.9  18:52 ( 31, 12)  

* C/2023 R2 ( PanSTARRS )

It will fade out rapidly after this. In the Northern Hemisphere, it will be unobservable in December. 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)  
Oct.  5  14 17.69   -0 32.9   2.154   1.303    23   13.3  19:02 ( 87,  4)  
Oct. 12  14 43.10   -1 10.7   2.237   1.387    24   13.7  18:52 ( 85,  5)  

* C/2024 B1 ( Lemmon )

It became much brighter than expected. Now it is 13.8 mag (Sept. 8, Michael Jager). Fading gradually. It stays extremely low in the Northern Hemisphere. But it will become high in winter. In the Southern Hemisphere, it is not observable now.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  12  4.16   48 47.8   2.004   1.634    54   13.4   4:34 (224, 20)  
Oct. 12  12 43.91   47 15.3   1.990   1.635    54   13.4   4:39 (225, 19)  

* 37P/Forbes

Now it is 13.9 mag (Sept. 20, Mike Olason). Fading gradually. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  16 29.04  -26  1.6   1.913   1.619    57   13.8  19:02 ( 46, 11)  
Oct. 12  16 51.25  -26  9.8   1.951   1.618    55   13.9  18:52 ( 46, 12)  

* 29P/Schwassmann-Wachmann 1

Now it is 14.6 mag (Sept. 29, Toshiyuki Takahashi). 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)  
Oct.  5   9 50.73   11 59.2   6.886   6.235    46   14.2   4:34 (274, 27)  
Oct. 12   9 54.60   11 33.9   6.801   6.237    52   14.1   4:39 (279, 33)  

* C/2021 G2 ( ATLAS )

Now it is 14.1 mag (Aug. 29, Chris Wyatt). It stays 14 mag for a while. Now it is not observable. It will appear 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)  
Oct.  5  13 33.95  -18 53.5   5.923   4.986    18   14.3  19:02 ( 77,-16)  
Oct. 12  13 41.27  -18 57.1   5.952   4.989    13   14.4  18:52 ( 79,-18)  

* C/2022 N2 ( PanSTARRS )

It is expected to brighten up to 13 mag in 2025 autumn, and it will be observable in good condition. Now it is 14.5 mag (Sept. 20, Ken-ichi Kadota). It stays 15 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  22 38.95   -5 17.7   3.750   4.623   147   14.5  21:41 (  0, 50)  
Oct. 12  22 37.25   -5 24.8   3.781   4.590   139   14.5  21:12 (  0, 50)  

* C/2024 G3 ( ATLAS )

It approaches to Sun down to 0.09 a.u. on Jan. 13. According to the calculation, it will brighten up to -1 mag. But probably, it will be disintegrated. At the high light, it may be observable after the perihelion passage only in the Southern Hemisphere. Now it is 15.6 mag (Sept. 15, ATLAS Chile). It will brighten rapidly after this. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be unobservable in December. But it will be observable again in January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  14  8.21  -47 37.4   2.857   2.288    46   14.9  19:02 ( 47,-24)  
Oct. 12  14 18.95  -46 44.0   2.811   2.176    42   14.6  18:52 ( 49,-24)  

* C/2022 QE78 ( ATLAS )

Now it is 15.2 mag (Sept. 30, Hiroshi Abe). It stays 14 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   6 42.64    3  3.9   5.923   6.017    90   14.8   4:34 (328, 54)  
Oct. 12   6 44.47    2 60.0   5.799   5.996    96   14.7   4:39 (341, 56)  

* 487P/2024 N5 ( Siding Spring )

First return of a new periodic comet which brightened up to 16 mag in 2012. It is expected to brighten rapidly up to 14.5 mag in autumn. Now it is 15.9 mag (Oct. 2, Catalina Sky Survey). Fading gradually. 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)  
Oct.  5   4 46.87   14 47.5   1.109   1.822   119   15.2   3:52 (  0, 70)  
Oct. 12   4 47.65   18 22.4   1.042   1.817   125   15.0   3:25 (  0, 73)  

* C/2021 S3 ( PanSTARRS )

It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 13.7 mag (Sept. 27, Hiroshi Abe). Fading gradually. 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)  
Oct.  5  19 37.63   45  9.5   2.977   3.344   102   15.1  19:02 (159, 79)  
Oct. 12  19 43.93   43 21.8   3.078   3.416   101   15.3  18:52 (144, 79)  

* C/2020 V2 ( ZTF )

It was observed at 9-10 mag for a long time in 2023. Now it is 15.0 mag (Sept. 11, ATLAS Chile). Fading slowly. 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)  
Oct.  5  21 26.18  -69 53.0   5.445   5.678    98   15.2  20:29 (  0,-15)  
Oct. 12  21 15.17  -69 15.1   5.583   5.733    93   15.3  19:50 (  0,-14)  

* C/2024 M1 ( ATLAS )

It is expected to brighten up to 13.5 mag, and it will be observable in good condition in winter. Now it is 16.2 mag (Sept. 23, ATLAS South Africa). 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 January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   6 53.56  -24 30.8   1.573   1.802    85   15.5   4:34 (338, 27)  
Oct. 12   6 54.24  -23 14.5   1.458   1.775    90   15.3   4:39 (346, 30)  

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 15.4 mag (Oct. 4, A. Diepvens). It stays 16 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   6 26.37   18 12.4   6.778   6.947    95   15.4   4:34 (319, 69)  
Oct. 12   6 25.40   18 24.5   6.715   7.003   102   15.4   4:39 (341, 73)  

* 130P/McNaught-Hughes

Now it is 14.7 mag (Sept. 14, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in January. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   2 32.76    7 40.1   1.376   2.311   152   15.5   1:38 (  0, 63)  
Oct. 12   2 27.01    7 23.4   1.378   2.344   160   15.6   1:05 (  0, 63)  

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.0 mag (Sept. 10, Thomas Lehmann). It stays 15 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)  
Oct.  5   4 19.87  -68 50.0  15.721  15.887    97   15.5   3:24 (  0,-14)  
Oct. 12   4 18.02  -69 14.7  15.713  15.863    96   15.5   2:54 (  0,-14)  

* C/2023 Q1 ( PanSTARRS )

Now it is 16.3 mag (Oct. 2, D. Buczynski). It stays 15 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   6 25.94   61 10.0   2.345   2.648    96   15.6   4:34 (195, 62)  
Oct. 12   6 43.84   62 52.4   2.276   2.631    99   15.5   4:39 (190, 61)  

* 30P/Reinmuth 1

Now it is 16.5 mag (Apr. 3, Taras Prystavski). It stays 16 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in winter. 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)  
Oct.  5  11  8.07    8 52.3   2.696   1.866    27   15.7   4:34 (266,  9)  
Oct. 12  11 24.67    7 27.7   2.679   1.882    30   15.7   4:39 (269, 12)  

* C/2022 L2 ( ATLAS )

Now it is 15.6 mag (July 24, Thomas Lehmann). It stays 16 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)  
Oct.  5   9 55.49  -29 53.6   4.030   3.426    46   15.7   4:34 (307,  0)  
Oct. 12   9 54.50  -31  5.7   4.006   3.469    51   15.7   4:39 (313,  4)  

* C/2023 V4 ( Camarasa-Duszanowicz )

It brightened very rapidly up to 10.0 mag in June (June 11, Virgilio Gonano). Now it is 14.6 mag (Sept. 14, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in November. In the Northern Hemisphere, it will be unobservable in November. 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)  
Oct.  5  14 47.01   11 27.8   2.963   2.214    34   15.9  19:02 ( 92, 16)  
Oct. 12  14 57.79    9  9.8   3.084   2.295    31   16.2  18:52 ( 92, 13)  

* 472P/2023 RL75 ( NEAT-LINEAR )

Now it is 16.1 mag (Oct. 2, ATLAS South Africa). It stays 16 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   6 30.39   13 46.4   3.214   3.438    94   16.0   4:34 (323, 65)  
Oct. 12   6 34.53   13 16.1   3.127   3.446   100   15.9   4:39 (339, 67)  

* P/2023 S1

Now it is 15.6 mag (Sept. 25, ATLAS-HKO, Haleakala). Brightening 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 winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   8 19.36   24 50.3   2.917   2.751    70   16.1   4:34 (274, 52)  
Oct. 12   8 28.97   24 14.9   2.818   2.739    75   16.0   4:39 (279, 56)  

* 146P/Shoemaker-LINEAR

Now it is 15.3 mag (Sept. 8, Thomas Lehmann). It will fade out rapidly after this. It will be fainter than 18 mag in December. 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)  
Oct.  5   6  4.60   22 56.8   1.049   1.580   100   16.2   4:34 (325, 76)  
Oct. 12   6 12.74   25 27.3   1.025   1.615   105   16.5   4:39 (346, 80)  

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 15.1 mag (Aug. 2, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  11 53.96  -48 23.2   9.494   8.814    44   16.2   4:34 (311,-29)  
Oct. 12  11 58.88  -48 51.8   9.548   8.859    44   16.3   4:39 (314,-25)  

* C/2024 A1 ( ATLAS )

Now it is 16.9 mag (Oct. 5, ATLAS South Africa). Brightening slowly. It locates somewhat low in the Northern Hemisphere. But it will become high in winter. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   8 13.18  -26 12.9   4.722   4.444    67   16.3   4:34 (322, 17)  
Oct. 12   8 15.09  -26 22.2   4.619   4.415    72   16.3   4:39 (328, 21)  

* C/2022 R6 ( PanSTARRS )

Now it is 16.4 mag (Sept. 18, ATLAS South Africa). 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)  
Oct.  5   7  5.41  -27 27.1   6.968   6.918    83   16.3   4:34 (337, 24)  
Oct. 12   7  7.40  -27 56.5   6.883   6.904    87   16.3   4:39 (344, 25)  

* C/2019 U5 ( PanSTARRS )

Now it is 15.5 mag (Oct. 3, ATLAS South Africa). It stays 17 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)  
Oct.  5   7 54.50  -41 41.5   6.178   5.975    73   16.4   4:34 (334,  6)  
Oct. 12   7 52.62  -42 50.5   6.162   6.018    77   16.4   4:39 (340,  8)  

* 154P/Brewington

It brightened up to 12.0 mag in June (June 13, Ken-ichi Kadota). Now it is 16.1 mag (Oct. 1, Toshiyuki Takahashi). Fading slowly. 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)  
Oct.  5   8 42.17   34 12.6   2.119   1.990    68   16.4   4:34 (257, 51)  
Oct. 12   8 55.11   33 41.0   2.094   2.036    72   16.5   4:39 (260, 54)  

* C/2023 H5 ( Lemmon )

It will be observable at 15 mag for a long time in 2025 in the Northern Hemisphere. Brightening slowly. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now, but it will appear in December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  11 25.80   23 30.9   5.638   4.841    34   16.5   4:34 (251, 14)  
Oct. 12  11 31.43   23 58.0   5.545   4.816    39   16.5   4:39 (254, 19)  

* C/2020 K1 ( PanSTARRS )

It brightened up to 12.1 mag in 2023 spring (May 20, 2023, Jose Guilherme de S. Aguiar). Now it is 16.8 mag (Oct. 4, ATLAS South Africa). It stays 17 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)  
Oct.  5   7  0.95  -38 51.3   5.643   5.622    83   16.5   4:34 (342, 13)  
Oct. 12   6 59.98  -39 23.4   5.632   5.670    87   16.6   4:39 (349, 14)  

* 253P/PanSTARRS

Now it is 16.2 mag (Oct. 5, ATLAS South Africa). Fading slowly. It will be fainter than 18 mag in January. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   0 48.47   -2 10.4   1.034   2.031   173   16.7  23:50 (  0, 53)  
Oct. 12   0 44.91   -2 51.5   1.041   2.028   168   16.7  23:19 (  0, 52)  

* 299P/Catalina-PanSTARRS

It brightened very rapidly in outburst in late May, and brightened up to 14.9 mag (May 19, Taras Prystavski). Now it is 17.2 mag (Oct. 3, ATLAS Chile). It stays 17 mag for a while. It will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  16 36.37  -22 57.8   3.658   3.257    58   16.7  19:02 ( 47, 15)  
Oct. 12  16 45.90  -23  2.0   3.748   3.265    54   16.8  18:52 ( 49, 13)  

* C/2019 E3 ( ATLAS )

Very far object. Now it is 17.0 mag (Oct. 5, ATLAS Chile). 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)  
Oct.  5   2  7.65  -69 40.3  10.167  10.458   104   16.7   1:13 (  0,-15)  
Oct. 12   1 58.15  -69 41.3  10.203  10.464   102   16.7   0:36 (  0,-15)  

* 43P/Wolf-Harrington

Now it is 16.8 mag (Oct. 4, ATLAS-MLO, Mauna Loa). 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)  
Oct.  5   2 17.11   21 20.8   2.284   3.201   151   16.9   1:23 (  0, 76)  
Oct. 12   2 13.28   20 55.3   2.219   3.173   159   16.8   0:51 (  0, 76)  

* C/2023 R1 ( PanSTARRS )

Now it is 16.9 mag (Sept. 15, ATLAS-MLO, Mauna Loa). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in December.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  22 54.43   28 52.6   5.124   5.968   144   16.8  21:56 (  0, 84)  
Oct. 12  22 46.95   27 57.2   5.119   5.923   140   16.8  21:21 (  0, 83)  

* C/2022 U3 ( Bok )

Now it is 18.9 mag (Sept. 30, Yasukazu Ikari). 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)  
Oct.  5   7 58.52   10 57.6   5.059   4.856    72   16.8   4:34 (296, 48)  
Oct. 12   8  2.18   10  5.2   4.963   4.863    78   16.8   4:39 (305, 53)  

* C/2023 TD22 ( Lemmon )

Brightened rapidly. Now it is 16.2 mag (Sept. 28, A. Diepvens). Fading gradually. It will be fainter than 18 mag in November. It will be getting lower gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  20 13.53  -11 49.2   1.818   2.366   110   16.8  19:15 (  0, 43)  
Oct. 12  19 58.45  -12 51.7   1.984   2.373   100   17.0  18:52 (  6, 42)  

* 333P/LINEAR

It is expected to brighten very rapidly up to 10 mag from November to Decemebr. Now it is 18.9 mag (July 7, J. L. Virlichie, P. Traverse, H. Roy). It will brighten rapidly after this. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  10 25.95   -4 15.1   2.047   1.345    34   18.3   4:34 (283, 10)  
Oct. 12  10 31.96   -2 36.4   1.900   1.296    39   16.9   4:39 (286, 17)  

* C/2022 U1 ( Leonard )

Now it is 16.5 mag (Oct. 1, A. 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 unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  19 10.48   30 18.6   4.248   4.500    98   16.9  19:02 ( 69, 79)  
Oct. 12  19  7.73   28 17.4   4.356   4.521    93   17.0  18:52 ( 70, 74)  

* 190P/Mueller

Now it is 17.5 mag (Sept. 12, A. Diepvens). 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)  
Oct.  5  22 37.99   -7 23.3   1.230   2.136   146   17.0  21:40 (  0, 48)  
Oct. 12  22 36.96   -7 21.4   1.258   2.117   139   17.0  21:11 (  0, 48)  

* 305P/Skiff

It will brighten up to 16 mag and will be observable in good condition in winter. Now it is 17.6 mag (Oct. 5, ATLAS-HKO, Haleakala). 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)  
Oct.  5  21 31.91   12  4.0   0.644   1.509   132   17.2  20:34 (  0, 67)  
Oct. 12  21 38.95   11  1.2   0.643   1.483   127   17.0  20:14 (  0, 66)  

* 49P/Arend-Rigaux

It will brighten up to 14 mag in 2025 spring. Now it is 17.1 mag (Sept. 23, Taras Prystavski). Brightening 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)  
Oct.  5  23 54.82  -29 50.5   1.488   2.368   143   17.1  22:56 (  0, 25)  
Oct. 12  23 48.55  -30 31.6   1.485   2.321   137   17.1  22:22 (  0, 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 16.9 mag (Sept. 11, ATLAS-MLO, Mauna Loa). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. But it will be getting higher again after January. In the Southern Hemisphere, it will be unobservable in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  17 22.98   26 38.8   8.041   7.829    74   17.1  19:02 ( 87, 56)  
Oct. 12  17 26.03   26  9.6   8.145   7.871    70   17.2  18:52 ( 88, 52)  

* 89P/Russell 2

Now it is 16.2 mag (Sept. 8, ATLAS Chile). 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)  
Oct.  5  23 15.61  -19 53.7   1.710   2.608   147   17.1  22:17 (  0, 35)  
Oct. 12  23 12.29  -19 20.0   1.783   2.632   140   17.3  21:47 (  0, 36)  

* 48P/Johnson

Now it is 17.3 mag (Oct. 1, ATLAS Chile). Brightening gradually. It will be unobservable in December. It will brighten up to 14.5 mag in 2025 spring. But the condition is bad.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  16 34.82  -18 32.8   2.678   2.309    57   17.3  19:02 ( 51, 18)  
Oct. 12  16 47.15  -19 24.8   2.723   2.285    54   17.2  18:52 ( 51, 16)  

* 242P/Spahr

Now it is 17.9 mag (Sept. 27, ATLAS-HKO, Haleakala). 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)  
Oct.  5   4 22.16   -9 58.7   3.346   3.988   123   17.3   3:27 (  0, 45)  
Oct. 12   4 21.63  -11  5.5   3.284   3.985   128   17.3   2:59 (  0, 44)  

* 302P/Lemmon-PanSTARRS

Now it is 17.0 mag (Oct. 4, ATLAS South Africa). It stays 18 mag for a while. It will be getting lower gradually after this, and it will be unobservable in January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  19  5.17  -22 39.5   3.157   3.362    93   17.3  19:02 ( 14, 31)  
Oct. 12  19 10.48  -22 38.8   3.250   3.356    87   17.3  18:52 ( 18, 30)  

* 338P/McNaught

Now it is 17.2 mag (Sept. 25, Masayoshi Yoshimi). Fading gradually. 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)  
Oct.  5   2 39.94   33 28.5   1.473   2.333   140   17.4   1:46 (  0, 89)  
Oct. 12   2 33.25   34 59.3   1.446   2.343   146   17.4   1:12 (180, 90)  

* 328P/LONEOS-Tucker

Now it is 17.7 mag (Sept. 21, Thomas Lehmann). It will fade out rapidly after this. It will be fainter than 18 mag in November. 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)  
Oct.  5   4  8.85   45 57.0   1.285   1.980   119   17.4   3:14 (180, 79)  
Oct. 12   4 10.45   47 34.2   1.259   2.001   124   17.5   2:49 (180, 77)  

* 192P/Shoemaker-Levy 1

It brightened up to 15.9 mag in summer (July 8, Hidetaka Sato). Now it is 17.8 mag (Sept. 12, ATLAS-HKO, Haleakala). It will fade out rapidly after this. It will be fainter than 18 mag soon. 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)  
Oct.  5   7 13.26   34 42.5   1.969   2.155    86   17.5   4:34 (263, 69)  
Oct. 12   7 21.37   36  0.2   1.940   2.211    91   17.7   4:39 (261, 74)  

* C/2021 S4 ( Tsuchinshan )

Now it is 18.2 mag (Oct. 2, ATLAS-MLO, Mauna Loa). 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)  
Oct.  5   7 33.45   39 14.7   6.968   6.925    83   17.5   4:34 (251, 65)  
Oct. 12   7 36.47   39 24.7   6.874   6.937    89   17.5   4:39 (250, 71)  

* 492P/2024 O3 ( LINEAR )

First return of a new periodic comet which brightened up to 15 mag in 2010. Now it is 17.8 mag (Sept. 4, M. Zhang, X. Gao). 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)  
Oct.  5   8 20.99   30 38.9   2.022   1.957    71   17.6   4:34 (265, 54)  
Oct. 12   8 35.66   30 20.1   1.987   1.988    75   17.5   4:39 (267, 58)  

* C/2024 J3 ( ATLAS )

Now it is 17.5 mag (Oct. 2, ATLAS Chile). It stays 17 mag for a while. It will be unobservable in December. But it will be observable again in January in the Southern Hemisphere. It is expected to brighten up to 13 mag in 2026, and it will be observable in excellent condition in the Northern Hemisphere. In the Southern Hemisphere, it locates very low at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  18 22.61  -36 15.6   7.469   7.413    82   17.6  19:02 ( 20, 15)  
Oct. 12  18 23.68  -35 43.2   7.540   7.370    76   17.6  18:52 ( 23, 15)  

* C/2022 S4 ( Lemmon )

It has started fading before the perihelion passage. Now it is 17.0 mag (Aug. 11, Thomas Lehmann). It stays 18 mag for a while. In the Northern Hemisphere, it will never be observable after this. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  12 21.88  -63 24.9   3.264   2.877    58   17.6   4:34 (327,-37)  
Oct. 12  12 46.52  -62 46.7   3.343   2.898    55   17.7   4:39 (327,-36)  

* P/2010 A3 ( Hill )

First return of a new periodic comet which brightened up to 15 mag in 2010. It is expected to brighten up to 15 mag from winter to spring, and it will be observable in excellent condition in the Northern Hemisphere. Now it is fainter than 21.5 mag (Sept. 3, Erwin Schwab). Brightening gradually. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5   3  8.01    4 23.7   1.472   2.356   144   17.9   2:13 (  0, 59)  
Oct. 12   3  5.83    4 29.5   1.381   2.305   150   17.6   1:44 (  0, 60)  

* 50P/Arend

Now it is 17.1 mag (Sept. 13, A. Diepvens). 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)  
Oct.  5   9  2.62   33 58.2   2.543   2.304    64   17.7   4:34 (255, 46)  
Oct. 12   9 14.93   33 27.5   2.501   2.336    68   17.7   4:39 (258, 50)  

* C/2021 X1 ( Maury-Attard )

It brightened up to 14 mag in early 2023 and 2023 autumn. Now it is 17.9 mag (Sept. 6, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag soon. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  20 21.93   16 47.1   5.026   5.521   114   17.7  19:24 (  0, 72)  
Oct. 12  20 18.20   15 59.4   5.170   5.568   108   17.8  18:53 (  0, 71)  

* C/2024 J2 ( Wierzchos )

Now it is 17.7 mag (Sept. 13, J.-G. Bosch). Brightening slowly. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it is not observable now. It will brighten up to 15.5 mag from winter to spring. But it is not observable around the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  5  15  3.06   39 24.0   3.166   2.711    54   17.8  19:02 (118, 33)  
Oct. 12  15 16.82   38 50.7   3.098   2.652    54   17.7  18:52 (118, 32)  

* 117P/Helin-Roman-Alu 1

Now it is 17.0 mag (Sept. 14, Ken-ichi Kadota). 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)  
Oct.  5   3 35.18   16 58.8   3.690   4.467   136   17.7   2:41 (  0, 72)  
Oct. 12   3 32.29   16 53.8   3.635   4.480   143   17.7   2:10 (  0, 72)  

* 276P/Vorobjov

Now it is 17.3 mag (Oct. 4, Mt. Lemmon Survey). 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)  
Oct.  5   3 12.45   14 39.0   3.073   3.910   142   17.9   2:18 (  0, 70)  
Oct. 12   3 10.26   14  6.1   3.014   3.908   149   17.8   1:48 (  0, 69)  

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Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.