Weekly Information about Bright Comets (2023 Dec. 16: North)

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 Updated on December 17, 2023
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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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* 62P/Tsuchinshan 1

Now it is 8.0 mag (Dec. 13, 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)  
Dec. 16  10 40.21   15 49.2   0.556   1.269   107    7.4   5:04 (  0, 71)  
Dec. 23  11  4.52   14 33.9   0.538   1.264   108    7.2   5:00 (  0, 69)

* 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 major outburst by 5 mag up to 11.5 mag on July 20 (E. Tamas, Francois Kugel). It brightened again in another major outburst up to 9.4 mag on Nov. 15 (Nick James). Now it is 9.4 mag (Dec. 13, Carlos Labordena). It will brighten rapidly after this. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it is not observable now. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  18 56.65   37 55.5   2.442   2.203    64    8.3  18:20 (117, 31)  
Dec. 23  19 13.15   37 46.5   2.363   2.115    63    8.1  18:23 (118, 28)

* C/2021 S3 ( PanSTARRS )

It is expected to brighten up to 8.5 mag in early 2024. Now it is 11.6 mag (Dec. 11, Chris Wyatt). Brightening slowly. It locates somewhat low in the Northern 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)  
Dec. 16  13 52.76  -39 43.9   2.064   1.594    48   10.0   5:30 (329,  6)  
Dec. 23  14 17.87  -39  5.9   1.983   1.540    49    9.8   5:34 (330,  7)

* C/2023 H2 ( Lemmon )

It approached to Earth down to 0.2 a.u. in early November, and brightened up to 6.2 mag (Nov. 11, Marco Goiato). Now it is 8.9 mag (Dec. 9, Marco Goiato). Fading rapidly. In the Northern Hemisphere, it will be unobservable in January. In the Southern Hemisphere, it will be getting lower gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  22 47.46  -41 10.1   1.214   1.228    66   11.5  18:20 ( 13, 12)  
Dec. 23  22 57.61  -41 53.5   1.422   1.309    62   12.1  18:23 ( 17, 10)

* 103P/Hartley 2

It approached to Earth down to 0.38 a.u., and brightened up to 8.0 mag in autumn (Sept. 29, Virgilio Gonano). Now it is 11.2 mag (Dec. 11, Chris Wyatt). Fading rapidly. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   9  2.52  -13  3.0   0.608   1.371   116   11.7   3:27 (  0, 42)  
Dec. 23   8 57.49  -14  5.2   0.628   1.427   123   12.0   2:54 (  0, 41)

* 144P/Kushida

It is expected to brighten up to 8.5 mag from January to February. Now it is 12.2 mag (Dec. 12, Toshihiko Ikemura, Hirohisa Sato). Brightening rapidly. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   2 50.42   15 10.0   0.572   1.475   141   12.5  21:12 (  0, 70)  
Dec. 23   2 55.24   14 41.0   0.578   1.452   135   11.7  20:49 (  0, 70)

* C/2020 V2 ( ZTF )

Now it is 11.8 mag (Dec. 5, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it will be unobservable in January. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  23 18.10  -42 12.1   3.476   3.311    72   11.9  18:20 (  8, 12)  
Dec. 23  23 16.90  -41 48.9   3.635   3.365    66   12.1  18:23 ( 14, 12)

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 12.1 mag (Dec. 11, Chris Wyatt). Fading slowly. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   5 54.40   -5  3.9   3.584   4.471   151   12.5   0:19 (  0, 50)  
Dec. 23   5 46.69   -4 12.1   3.641   4.534   152   12.6  23:39 (  0, 51)

* C/2022 E2 ( ATLAS )

It will brighten up to 12 mag from 2024 to 2025. Now it is 13.2 mag (Dec. 12, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 16   9 26.55    9 55.7   3.782   4.390   122   13.1   3:51 (  0, 65)  
Dec. 23   9 20.02   11  7.7   3.642   4.357   131   13.0   3:17 (  0, 66)

* C/2019 U5 ( PanSTARRS )

Now it is 13.6 mag (Dec. 8, Taras Prystavski). It stays 14 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)  
Dec. 16  10 25.04  -38 33.2   4.232   4.305    87   13.2   4:49 (  0, 16)  
Dec. 23  10 17.23  -40  8.7   4.172   4.338    93   13.2   4:14 (  0, 15)

* 29P/Schwassmann-Wachmann 1

Now it is 12.4 mag (Dec. 12, Toshihiko Ikemura, Hirohisa Sato). It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   8 40.68   20 33.5   5.414   6.162   136   13.6   3:05 (  0, 75)  
Dec. 23   8 38.55   20 38.2   5.342   6.164   143   13.6   2:35 (  0, 76)

* C/2021 T4 ( Lemmon )

It brightened up to 7.8 mag in late July (July 20, Thomas Lehmann). Now it is 12.9 mag (Oct. 3, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it is not observable now, but it will be observable soon. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  15 15.69   -7 25.1   3.089   2.368    36   13.7   5:30 (293, 18)  
Dec. 23  15 16.42   -6 38.7   3.057   2.436    43   13.8   5:34 (298, 24)

* C/2022 L2 ( ATLAS )

Now it is 14.9 mag (Sept. 18, Ken-ichi Kadota). Brightening slowly. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will be getting higher gradually. 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)  
Dec. 16  15 28.40  -14 46.0   3.650   2.843    30   14.2   5:30 (296, 10)  
Dec. 23  15 30.04  -16  2.8   3.550   2.820    36   14.1   5:34 (302, 15)

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 16.7 mag (Dec. 7, ATLAS South Africa). It stays 14 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)  
Dec. 16  11 27.50  -47 28.4   7.137   6.926    73   14.1   5:30 (356,  7)  
Dec. 23  11 28.41  -48 25.1   7.108   6.971    78   14.2   5:25 (  0,  6)

* 26P/Grigg-Skjellerup

It will turn to fade out rapidly after brightening. It will be fainter than 18 mag in February. It stays extremely low. It will brighten up to 13 mag in January. But it locates extremely low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  15 16.16  -20  6.4   1.802   1.091    31   15.4   5:30 (303,  9)  
Dec. 23  15 47.89  -20  5.7   1.796   1.084    31   14.3   5:34 (303,  9)

* 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 14.1 mag (Dec. 8, Yukihiro Sugiyama). It will brighten rapidly after this. It will be getting higher gradually. 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)  
Dec. 16  14 53.50   -6 40.6   5.117   4.427    41   14.5   5:30 (296, 22)  
Dec. 23  14 57.02   -6 58.8   4.955   4.349    47   14.4   5:34 (302, 27)

* C/2021 G2 ( ATLAS )

Now it is 14.7 mag (Dec. 11, Chris Wyatt). It stays 14 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)  
Dec. 16  11 59.46  -35 50.7   5.625   5.389    71   14.6   5:30 (349, 18)  
Dec. 23  12  3.37  -36 25.2   5.519   5.369    76   14.5   5:34 (355, 18)

* C/2020 K1 ( PanSTARRS )

It brightened up to 12.1 mag in spring (May 20, Jose Guilherme de S. Aguiar). Now it is 14.8 mag (Dec. 11, Chris Wyatt). 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. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   7  2.81  -86 43.5   3.963   3.738    69   14.6   1:24 (  0,-32)  
Dec. 23   5 18.09  -85 36.7   3.982   3.776    70   14.7  22:59 (  0,-30)

* 32P/Comas Sola

Now it is 13.5 mag (Dec. 5, Chris Wyatt). It stays 15 mag for a while. 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)  
Dec. 16   2 45.12   17 28.7   1.461   2.309   140   14.7  21:06 (  0, 73)  
Dec. 23   2 42.90   17 54.1   1.491   2.280   133   14.7  20:37 (  0, 73)

* C/2023 X1 ( Leonard )

Bright new comet. Now it is 14.8 mag (Dec. 7, Katsumi Yoshimoto). It will fade out rapidly after this. It will be fainter than 18 mag in February. 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)  
Dec. 16  13  3.71   34  4.6   1.044   1.379    85   15.0   5:30 (265, 66)  
Dec. 23  13 22.68   44 45.8   1.026   1.461    93   15.2   5:34 (237, 68)

* 2P/Encke

It brightened up to 8.1 mag in autumn (Oct. 10, Juan Jose Gonzalez). Fading rapidly. It will be fainter than 18 mag in February. It will never be observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  18 25.87  -28  3.5   2.130   1.193    13   15.1  18:20 ( 63,-10)  
Dec. 23  18 50.85  -27 34.0   2.245   1.298    11   15.8  18:23 ( 64,-11)

* 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 15.7 mag (Dec. 6, A. Diepvens). It stays 15 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 February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  16 48.27   16  6.8   6.860   6.148    40   15.2   5:30 (259, 13)  
Dec. 23  16 54.15   16 23.3   6.867   6.186    43   15.2   5:34 (262, 18)

* C/2021 X1 ( Maury-Attard )

Now it is 15.6 mag (Dec. 4, Hiroshi Abe). Fading slowly. It will be unobservable in January in the Southern Hemisphere, or in February in the Northern Hemisphere. But it will be observable again in March in the Northern Hemisphere, or in April in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  22 32.91    3 11.5   3.837   3.756    77   15.2  18:20 ( 37, 53)  
Dec. 23  22 31.21    3 23.8   4.000   3.789    70   15.3  18:23 ( 48, 48)

* 226P/Pigott-LINEAR-Kowalski

Now it is 15.2 mag (Dec. 3, Ken-ichi Kadota). 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 March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   0 39.14  -20  0.1   1.369   1.777    96   15.3  19:01 (  0, 35)  
Dec. 23   0 42.72  -15 10.7   1.427   1.774    92   15.3  18:37 (  0, 40)

* 207P/NEAT

It will approach to Earth down to 0.2 a.u. from February to March, and it is expected to brighten up to 13 mag. Now it is 17.5 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). Brightening gradually. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   0  2.76  -12 18.0   0.601   1.173    92   15.6  18:25 (  0, 43)  
Dec. 23   0 11.78  -13  7.6   0.581   1.115    86   15.3  18:23 (  5, 42)

* C/2023 S2 ( ATLAS )

It brightened up to 12.6 mag in autumn (Oct. 3, Chris Wyatt). Now it is 17.5 mag (Dec. 7, Toshihiko Ikemura, Hirohisa Sato). Fading rapidly. It will be fainter than 18 mag in January. 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)  
Dec. 16  21 59.88    1 20.6   1.468   1.456    69   15.7  18:20 ( 46, 47)  
Dec. 23  22 27.61    2 29.1   1.567   1.530    69   16.2  18:23 ( 47, 47)

* 471P/2023 KF3

David Rankin detected its cometary activity in June. Now it is 16.3 mag (Dec. 11, Catalina Sky Survey). Fading gradually. It will be fainter than 18 mag in April. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  23 11.22    0 23.8   1.960   2.124    85   15.8  18:20 ( 20, 54)  
Dec. 23  23 22.93    1 25.3   2.032   2.124    81   15.9  18:23 ( 28, 53)

* C/2023 P1 ( Nishimura )

It approached to Sun down to 0.23 a.u. and brightened up to 2.5 mag in mid September (Sept. 18, Juan Jose Gonzalez). Now it is 11.8 mag (Dec. 16, Martin Masek). Fading rapidly. It will be fainter than 18 mag in February. In the Northern Hemisphere, it will be unobservable in January. In the Southern Hemisphere, 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)  
Dec. 16  12 34.15  -47 43.5   2.239   1.989    62   15.8   5:30 (345,  5)  
Dec. 23  12 24.40  -50  1.6   2.245   2.101    68   16.2   5:34 (352,  4)

* 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 16.3 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It will be fainter than 18 mag in February. It will be getting lower gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  23 48.75  -16 18.6   3.430   3.526    87   15.8  18:20 (  3, 39)  
Dec. 23  23 53.79  -15  6.1   3.568   3.569    82   16.1  18:23 ( 11, 39)

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.9 mag (Nov. 22, 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)  
Dec. 16   2 59.77  -65 51.5  16.940  16.906    86   16.0  21:20 (  0,-11)  
Dec. 23   2 57.46  -65 41.9  16.952  16.881    84   16.0  20:50 (  0,-11)

* P/2007 T2 ( Kowalski )

New peridic comet which brightened up to 16 mag in 2007. It has not been recovered yet. It was missed in 2013 and 2018. It will approach to Earth down to 0.34 a.u. in winter, and it is expected to brighten up to 16 mag. It will fade out rapidly after this. It will be fainter than 18 mag in February. 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)  
Dec. 16  20 58.07    1 59.7   0.386   0.834    56   16.0  18:20 ( 62, 38)  
Dec. 23  21 55.37   14  1.0   0.343   0.913    68   16.0  18:23 ( 69, 51)

* C/2022 A2 ( PanSTARRS )

It brightened up to 9.5 mag from last winter to early spring (Jan. 30, Katsumi Yoshimoto). Now it is 15.5 mag (Dec. 8, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in March. It will be unobservable in February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  22 38.57  -13 34.7   4.111   3.933    72   16.0  18:20 ( 25, 38)  
Dec. 23  22 41.59  -13 55.8   4.291   3.997    66   16.2  18:23 ( 32, 35)

* 213P/Van Ness

It has not been observed yet in this apparition. It was expected to brighten up to 15 mag in summer. But actually, it is not detected, fainter than 18 mag (Oct. 14, Martin Masek). Fading slowly. It will be unobservable in January in the Southern Hemisphere, or in February in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  20 47.03  -15  1.0   2.540   1.998    46   16.0  18:20 ( 51, 23)  
Dec. 23  21  2.76  -13 35.6   2.599   2.006    43   16.1  18:23 ( 55, 21)

* 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 16.8 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 16   3 19.17  -18 46.9   2.186   2.887   127   16.3  21:40 (  0, 36)  
Dec. 23   3 11.54  -17 24.9   2.171   2.814   121   16.1  21:05 (  0, 38)

* C/2022 S4 ( Lemmon )

Now it is 16.0 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag for a while. In the Northern Hemisphere, it will be unobservable in March. In the Southern Hemisphere, it stays observable in good condition. The brightness evolution is slower than originally expected. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   1 57.18  -28 35.3   3.104   3.518   106   16.1  20:18 (  0, 26)  
Dec. 23   1 51.48  -29 16.9   3.169   3.476    99   16.1  19:45 (  0, 26)

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 17.3 mag (Dec. 12, Jean-Claude Merlin). It stays 16 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)  
Dec. 16   9 12.77  -63 51.1   3.762   3.768    82   16.1   3:37 (  0, -9)  
Dec. 23   8 57.37  -66 22.2   3.748   3.780    84   16.1   2:54 (  0,-11)

* C/2021 Y1 ( ATLAS )

Now it is 14.3 mag (July 7, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in February. In the Southern Hemisphere, it will be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  15 29.92  -48 37.2   4.077   3.318    34   16.2   5:30 (322,-12)  
Dec. 23  15 40.54  -48 31.9   4.103   3.376    37   16.2   5:34 (324,-10)

* C/2022 V2 ( Lemmon )

Now it is 17.9 mag (Dec. 7, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag in April. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it stays observable in good condition. It is fainter than this ephemeris recently. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  11 42.05   -8 24.3   1.985   2.126    84   16.3   5:30 (347, 46)  
Dec. 23  11 34.04  -11 58.8   1.881   2.147    91   16.2   5:30 (  0, 43)

* 126P/IRAS

It brightened up to 13.6 mag in summer (July 16, Mitsunori Tsumura). Now it is 15.7 mag (Nov. 21, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in February. 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)  
Dec. 16  23 23.32   65 19.7   1.892   2.415   110   16.3  18:20 (173, 59)  
Dec. 23  23 31.90   64 38.5   1.976   2.463   107   16.6  18:23 (168, 59)

* C/2023 S3 ( Lemmon )

Now it is 14.6 mag (Dec. 5, Chris Wyatt). Fading slowly. It will be unobservable in January. But it will be observable again in February. It is brighter than this ephemeris recently. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  21 49.03  -38 56.5   1.194   1.042    56   16.6  18:20 ( 25, 10)  
Dec. 23  21 30.50  -38 36.6   1.340   0.972    46   16.5  18:23 ( 34,  6)

* C/2022 QE78 ( ATLAS )

Now it is 15.8 mag (Dec. 7, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 16   4 40.08  -12 26.9   6.322   7.125   142   16.5  23:01 (  0, 43)  
Dec. 23   4 37.52  -12  9.9   6.324   7.094   138   16.5  22:31 (  0, 43)

* C/2023 C2 ( ATLAS )

It is expected to brighten up to 12.5 mag in 2024 summer. Now it is 17.3 mag (July 28, ATLAS South Africa). Brightening gradually. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. Around the high light, it is observable in good condition in the Southern Hemisphere, but it locates very low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  13 48.46  -56 11.5   4.776   4.241    51   16.7   5:30 (339, -8)  
Dec. 23  14  0.20  -57 25.7   4.677   4.186    54   16.6   5:34 (342, -7)

* C/2022 N2 ( PanSTARRS )

It is expected to brighten up to 11.5 mag in 2025 autumn, and it will be observable in good condition. Now it is 17.0 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). Brightening slowly. It will be unobservable in January. But it will be observable again in March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  20 55.36  -17 31.2   6.878   6.261    47   16.6  18:20 ( 47, 22)  
Dec. 23  20 59.83  -17  9.9   6.915   6.218    41   16.6  18:23 ( 53, 18)

* C/2021 S4 ( Tsuchinshan )

Now it is 16.8 mag (Dec. 8, Ken-ichi Kadota). 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)  
Dec. 16   4 42.70   41 44.2   5.763   6.690   158   16.6  23:04 (180, 83)  
Dec. 23   4 39.84   41 38.5   5.786   6.690   154   16.6  22:33 (180, 83)

* 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 17.2 mag (Dec. 4, ATLAS South Africa). Fading slowly. It will be fainter than 18 mag in March. 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)  
Dec. 16   4  5.04  -62 36.8   4.330   4.481    92   16.7  22:24 (  0, -8)  
Dec. 23   3 49.79  -62  2.1   4.434   4.550    90   16.8  21:41 (  0, -7)

* C/2022 U3 ( Bok )

Now it is 17.0 mag (Dec. 12, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. 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)  
Dec. 16   4 46.98   35 30.6   4.181   5.136   164   16.8  23:08 (180, 90)  
Dec. 23   4 43.51   34 48.9   4.186   5.118   159   16.7  22:37 (  0, 90)

* C/2019 E3 ( ATLAS )

Very far object. Now it is 16.9 mag (Dec. 4, ATLAS South Africa). 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)  
Dec. 16   3  0.63  -76 15.3  10.477  10.314    77   16.8  21:19 (  0,-21)  
Dec. 23   2 48.63  -75 39.4  10.501  10.315    76   16.8  20:40 (  0,-21)

* 65P/Gunn

It will be observable at 15-16 mag from 2024 to 2025. Now it is 17.6 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 16  12 54.05    2 50.6   3.983   3.800    72   16.9   5:30 (316, 49)  
Dec. 23  12 59.31    2 26.8   3.866   3.785    77   16.9   5:34 (325, 52)

* 117P/Helin-Roman-Alu 1

Now it is 16.5 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag in March. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   0  7.87   -6 16.3   3.624   3.850    95   16.9  18:30 (  0, 49)  
Dec. 23   0 10.70   -5 39.0   3.745   3.866    89   17.0  18:23 (  7, 49)

* C/2020 S4 ( PanSTARRS )

It brightened up to 13.9 mag in early 2023 (Jan. 21, Hidenori Nohara). Now it is 18.7 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 16  14  7.27    6 34.5   4.841   4.400    58   16.9   5:30 (294, 40)  
Dec. 23  14 13.44    6 26.5   4.794   4.440    63   16.9   5:34 (299, 44)

* C/2020 Y2 ( ATLAS )

It brightened up to 14.1 mag in 2022 spring (Mar. 22, 2022, Chris Wyatt). Now it is 16.8 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It stays 18 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 March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   1 24.16   -0 24.7   5.344   5.836   115   17.0  19:45 (  0, 55)  
Dec. 23   1 21.25    0  3.7   5.504   5.884   108   17.1  19:15 (  0, 55)

* (3200) Phaethon

Fading slowly. It will be fainter than 18 mag in January. 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)  
Dec. 16  21 44.39    8 51.4   1.206   1.264    69   17.0  18:20 ( 57, 50)  
Dec. 23  22 10.58   10  6.4   1.344   1.356    69   17.3  18:23 ( 60, 50)

* C/2022 T1 ( Lemmon )

It stays 17 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in summer. In the Southern Hemisphere, it stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  13  6.25  -23 32.0   3.877   3.495    60   17.1   5:30 (330, 25)  
Dec. 23  13 14.90  -24 20.8   3.786   3.484    64   17.0   5:34 (335, 26)

* C/2022 R6 ( PanSTARRS )

Now it is 17.1 mag (Dec. 11, Jean-Claude Merlin). 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)  
Dec. 16   4 58.32  -40 57.9   7.272   7.744   115   17.1  23:18 (  0, 14)  
Dec. 23   4 55.60  -40 44.2   7.268   7.720   113   17.1  22:48 (  0, 14)

* 237P/LINEAR

It brightened up to 11.8 mag in summer (June 17, Osamu Miyazaki). Now it is 17.0 mag (Nov. 23, Catalina Sky Survey). Fading gradually. It will be fainter than 18 mag in January. 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)  
Dec. 16  21 35.91   -1 14.9   2.858   2.568    63   17.1  18:20 ( 50, 41)  
Dec. 23  21 47.20   -0 39.1   2.964   2.598    59   17.4  18:23 ( 56, 38)

* 227P/Catalina-LINEAR

Now it is 17.9 mag (Dec. 10, N. Paul, E. Cortes). It stays 17 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)  
Dec. 16   7 43.91   34 45.6   0.894   1.811   149   17.3   2:09 (  0, 90)  
Dec. 23   7 44.11   35 49.9   0.843   1.783   154   17.1   1:41 (180, 89)

* P/2023 W1 ( NEAT )

First return of a new periodic comet which brightened up to 10 mag in 2001. It is expected to brighten up to 12-13 mag from February to March in 2024. Now it is 16.4 mag (Dec. 1, Hidetaka Sato). It will brighten rapidly after this. 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)  
Dec. 16  23  7.03  -13 26.2   1.565   1.687    79   17.2  18:20 ( 16, 40)  
Dec. 23  23  8.98   -9  7.2   1.607   1.640    74   17.2  18:23 ( 27, 42)

* 150P/LONEOS

It brightens up to 16 mag from January to February. Now it is 17.4 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 16   9  9.97    4 30.6   1.205   1.936   124   17.5   3:34 (  0, 59)  
Dec. 23   9 12.45    2  3.5   1.128   1.910   129   17.3   3:09 (  0, 57)

* C/2022 U1 ( Leonard )

Now it is 17.5 mag (Dec. 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 March. In the Southern Hemisphere, it is not observable now. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  22 39.33   44 15.2   4.048   4.286    97   17.4  18:20 (127, 72)  
Dec. 23  22 36.20   42 46.8   4.138   4.275    91   17.4  18:23 (118, 67)

* C/2023 V4 ( Camarasa-Duszanowicz )

It is expected to brighten up to 13 mag in early summer in 2024. Now it is 17.3 mag (Dec. 9, ATLAS Chile). Brightening gradually. 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 April. At the high light, it is not observable in the Southern Hemisphere, or it locates low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16   2 33.82  -42 40.9   2.264   2.656   102   17.5  20:54 (  0, 13)  
Dec. 23   2 23.54  -40  7.6   2.238   2.576    98   17.4  20:16 (  0, 15)

* 170P/Christensen

Now it is 16.5 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). 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)  
Dec. 16   3 21.38    4 15.8   2.355   3.199   143   17.4  21:42 (  0, 59)  
Dec. 23   3 19.01    4 31.3   2.430   3.214   136   17.5  21:12 (  0, 60)

* C/2023 E1 ( ATLAS )

It brightened up to 8.4 mag in late July (July 22, Thomas Lehmann). Now it is 18.4 mag (Nov. 15, Toshihiko Ikemura, Hirohisa Sato). Fading rapidly. It will be fainter than 18 mag soon. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will be getting lower gradually. Thomas Lehmann reported it was bright as 14.9 mag on Nov. 18. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  23 40.54  -22 42.1   2.550   2.622    83   17.4  18:20 (  5, 32)  
Dec. 23  23 48.75  -21 56.2   2.718   2.700    78   17.8  18:23 ( 11, 32)

* C/2020 F2 ( ATLAS )

Now it is 17.3 mag (Dec. 8, 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 be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  12 33.20   13 30.9   9.406   9.313    81   17.6   5:30 (312, 61)  
Dec. 23  12 32.56   13 50.7   9.296   9.326    88   17.6   5:34 (326, 65)

* C/2021 A9 ( PanSTARRS )

Now it is 18.3 mag (Nov. 21, 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)  
Dec. 16   7  8.64    9 19.4   6.872   7.761   152   17.7   1:33 (  0, 64)  
Dec. 23   7  2.70    9 14.7   6.831   7.761   159   17.7   1:00 (  0, 64)

* P/2023 M4 ( ATLAS )

Now it is 17.2 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag soon. It locates somewhat low in the Northern Hemisphere. It stays extremely low in the Southern Hemisphere. 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)  
Dec. 16  21 35.33   -9 54.6   5.142   4.720    59   17.7  18:20 ( 44, 34)  
Dec. 23  21 40.68   -9 27.9   5.248   4.734    53   17.9  18:23 ( 50, 31)

* 404P/2020 M6 ( Bressi )

Now it is 18.4 mag (Dec. 7, Toshihiko Ikemura, Hirohisa Sato). It stays 18 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)  
Dec. 16   4 41.27   23 25.3   3.165   4.135   168   17.8  23:02 (  0, 78)  
Dec. 23   4 37.06   23  5.0   3.195   4.135   160   17.9  22:30 (  0, 78)

* C/2020 R7 ( ATLAS )

It brightened up to 13.4 mag in 2022 summer (July 7, 2022, Giuseppe Pappa). Now it is 18.6 mag (Oct. 2, ATLAS-HKO, Haleakala). 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)  
Dec. 16  16  9.39   31 60.0   5.641   5.197    58   17.8   5:30 (249, 28)  
Dec. 23  16 13.38   32 50.0   5.636   5.246    61   17.9   5:34 (251, 34)

* 30P/Reinmuth 1

Now it is 17.1 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It stays 18 mag for a while. 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)  
Dec. 16   1 21.46   -2 10.2   2.181   2.735   114   17.9  19:43 (  0, 53)  
Dec. 23   1 22.06   -1 39.1   2.234   2.698   107   17.8  19:16 (  0, 54)

* C/2023 T2 ( Borisov )

Now it is 18.0 mag (Dec. 6, A. Diepvens). Fading slowly. It will be fainter than 18 mag in January. 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)  
Dec. 16  21 21.25   75 45.6   1.510   2.007   105   17.9  18:20 (167, 45)  
Dec. 23  21 58.68   76 18.1   1.498   2.006   105   17.9  18:23 (168, 45)

* 216P/LINEAR

Now it is 19.3 mag (Sept. 29, F. Kugel, J. Nicolas). 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)  
Dec. 16  11 37.18    9 13.9   1.854   2.134    92   18.2   5:30 (343, 63)  
Dec. 23  11 46.08    8  7.0   1.775   2.130    96   18.0   5:34 (355, 63)

* P/2018 P3 ( PanSTARRS )

Now it is 19.8 mag (Dec. 12, Hidetaka Sato). Fading slowly. It locates somewhat low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 16  22 15.12  -18 22.4   1.908   1.753    65   18.4  18:20 ( 29, 32)  
Dec. 23  22 31.29  -16 21.7   1.961   1.751    63   18.3  18:23 ( 33, 32)

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