Weekly Information about Bright Comets (2023 Dec. 9: North)

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 Updated on December 13, 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 8.9 mag (Dec. 11, Chris Wyatt). 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.  9  10 14.31   17  4.3   0.578   1.279   106    7.7   5:05 (  0, 72)  
Dec. 16  10 40.21   15 49.2   0.556   1.269   107    7.4   5:04 (  0, 71)

* 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 8.8 mag (Dec. 8, Osamu Miyazaki). Brightening rapidly. 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.  9  18 41.60   38 11.9   2.519   2.291    65    8.5  18:18 (116, 34)  
Dec. 16  18 56.65   37 55.5   2.442   2.203    64    8.3  18:20 (117, 31)

* 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 spring. The brightness evolution slowed down since May. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  13 28.03  -40  0.4   2.145   1.652    47   10.2   5:25 (328,  5)  
Dec. 16  13 52.76  -39 43.9   2.064   1.594    48   10.0   5:30 (329,  6)

* 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.  9  22 35.34  -39 58.9   0.996   1.150    70   10.8  18:18 ( 10, 14)  
Dec. 16  22 47.46  -41 10.1   1.214   1.228    66   11.5  18:20 ( 13, 12)

* 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.  9   9  5.11  -11 28.2   0.588   1.316   111   11.2   3:57 (  0, 43)  
Dec. 16   9  2.52  -13  3.0   0.608   1.371   116   11.7   3:27 (  0, 42)

* 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.  9  23 20.70  -42 33.5   3.310   3.258    78   11.7  18:18 (  2, 13)  
Dec. 16  23 18.10  -42 12.1   3.476   3.311    72   11.9  18:20 (  8, 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.  9   6  2.25   -5 50.0   3.545   4.409   147   12.4   0:55 (  0, 49)  
Dec. 16   5 54.40   -5  3.9   3.584   4.471   151   12.5   0:19 (  0, 50)

* 144P/Kushida

It is expected to brighten up to 8.5 mag from January to February. Now it is 14.4 mag (Dec. 10, Ken-ichi Kadota). Brightening rapidly. 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.  9   2 48.14   15 51.7   0.572   1.502   148   12.8  21:37 (  0, 71)  
Dec. 16   2 50.42   15 10.0   0.572   1.475   141   12.5  21:12 (  0, 70)

* C/2022 E2 ( ATLAS )

It will brighten up to 12 mag from 2024 to 2025. Now it is 13.7 mag (Dec. 11, Chris Wyatt). 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.  9   9 31.87    8 52.6   3.933   4.423   113   13.2   4:24 (  0, 64)  
Dec. 16   9 26.55    9 55.7   3.782   4.390   122   13.1   3:51 (  0, 65)

* C/2019 U5 ( PanSTARRS )

Now it is 13.8 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.  9  10 31.42  -36 53.2   4.297   4.273    82   13.2   5:23 (  0, 18)  
Dec. 16  10 25.04  -38 33.2   4.232   4.305    87   13.2   4:49 (  0, 16)

* 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.  9  15 14.44   -8  6.1   3.108   2.300    29   13.6   5:25 (288, 11)  
Dec. 16  15 15.69   -7 25.1   3.089   2.368    36   13.7   5:30 (293, 18)

* 29P/Schwassmann-Wachmann 1

Now it is 13.0 mag (Dec. 11, Chris Wyatt). It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9   8 42.31   20 30.4   5.496   6.160   128   13.6   3:34 (  0, 75)  
Dec. 16   8 40.68   20 33.5   5.414   6.162   136   13.6   3:05 (  0, 75)

* 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. 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.  9  11 25.99  -46 30.0   7.164   6.880    69   14.1   5:25 (351,  8)  
Dec. 16  11 27.50  -47 28.4   7.137   6.926    73   14.1   5:30 (356,  7)

* 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 is not observable now, but it will be observable soon. 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.  9  15 26.44  -13 30.7   3.737   2.867    24   14.3   5:25 (291,  6)  
Dec. 16  15 28.40  -14 46.0   3.650   2.843    30   14.2   5:30 (296, 10)

* 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 January. It will never be observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  17 57.97  -28 17.2   2.013   1.084    14   14.4  18:18 ( 62,-10)  
Dec. 16  18 25.87  -28  3.5   2.130   1.193    13   15.1  18:20 ( 63,-10)

* 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 14.7 mag (Dec. 1, Ken-ichi Kadota). It will brighten rapidly after this. 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. 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.  9  14 49.81   -6 20.4   5.270   4.504    35   14.6   5:25 (291, 17)  
Dec. 16  14 53.50   -6 40.6   5.117   4.427    41   14.5   5:30 (296, 22)

* C/2020 K1 ( PanSTARRS )

Now it is 14.8 mag (Dec. 11, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. It was expected to brighten up to 10 mag from spring to summer. However, it was fainter than originally expected. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9   9 18.63  -86 38.2   3.943   3.701    68   14.6   4:08 (  0,-32)  
Dec. 16   7  2.81  -86 43.5   3.963   3.738    69   14.6   1:24 (  0,-32)

* 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.  9  11 55.09  -35 14.6   5.728   5.409    66   14.6   5:25 (343, 17)  
Dec. 16  11 59.46  -35 50.7   5.625   5.389    71   14.6   5:30 (349, 18)

* 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.  9   2 48.81   17  7.9   1.440   2.338   148   14.7  21:37 (  0, 72)  
Dec. 16   2 45.12   17 28.7   1.461   2.309   140   14.7  21:06 (  0, 73)

* 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.  9  22 35.57    3  3.8   3.670   3.724    85   15.0  18:18 ( 24, 56)  
Dec. 16  22 32.91    3 11.5   3.837   3.756    77   15.2  18:20 ( 37, 53)

* 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 14.3 mag (Nov. 3, Hiroshi Abe). 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.  9  16 42.29   15 54.3   6.845   6.110    38   15.1   5:25 (256,  7)  
Dec. 16  16 48.27   16  6.8   6.860   6.148    40   15.2   5:30 (259, 13)

* 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.  9   0 37.12  -24 58.1   1.319   1.782   100   15.3  19:26 (  0, 30)  
Dec. 16   0 39.14  -20  0.1   1.369   1.777    96   15.3  19:01 (  0, 35)

* C/2023 S2 ( ATLAS )

It brightened up to 12.6 mag in autumn (Oct. 3, Chris Wyatt). Now it is 15.2 mag (Nov. 21, Ken-ichi Kadota). 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.  9  21 29.92    0 12.1   1.382   1.385    69   15.3  18:18 ( 45, 46)  
Dec. 16  21 59.88    1 20.6   1.468   1.456    69   15.7  18:20 ( 46, 47)

* 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.  9  14 44.51  -19 45.1   1.814   1.105    31   16.6   5:25 (302,  9)  
Dec. 16  15 16.16  -20  6.4   1.802   1.091    31   15.4   5:30 (303,  9)

* 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 12.8 mag (Dec. 11, Chris Wyatt). Fading rapidly. It will be fainter than 18 mag in January. 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.  9  12 41.41  -45 20.4   2.229   1.875    56   15.4   5:25 (338,  5)  
Dec. 16  12 34.15  -47 43.5   2.239   1.989    62   15.8   5:30 (345,  5)

* 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 mag (Nov. 26, WISE). Brightening gradually. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  23 56.44  -11 16.4   0.617   1.235    98   15.9  18:46 (  0, 44)  
Dec. 16   0  2.76  -12 18.0   0.601   1.173    92   15.6  18:25 (  0, 43)

* 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 15.0 mag (Dec. 5, Chris Wyatt). It will fade out rapidly after this. It will be fainter than 18 mag in February. 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.  9  23 44.20  -17 30.6   3.292   3.484    92   15.6  18:34 (  0, 38)  
Dec. 16  23 48.75  -16 18.6   3.430   3.526    87   15.8  18:20 (  3, 39)

* 471P/2023 KF3

David Rankin detected its cometary activity in June. Now it is 16.2 mag (Dec. 3, R. Fichtl). 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 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.  9  23  0.12   -0 32.7   1.889   2.126    89   15.7  18:18 ( 12, 54)  
Dec. 16  23 11.22    0 23.8   1.960   2.124    85   15.8  18:20 ( 20, 54)

* C/2022 A2 ( PanSTARRS )

It brightened up to 9.5 mag from last winter to early spring (Jan. 30, Katsumi Yoshimoto). Now it is 16.0 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). Fading gradually. It will be fainter than 18 mag in March. It will be getting lower gradually after this, and it will be unobservable in February. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  22 36.08  -13  7.2   3.926   3.869    79   15.8  18:18 ( 17, 40)  
Dec. 16  22 38.57  -13 34.7   4.111   3.933    72   16.0  18:20 ( 25, 38)

* 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 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.  9  20 31.20  -16 22.2   2.480   1.992    49   16.0  18:18 ( 47, 24)  
Dec. 16  20 47.03  -15  1.0   2.540   1.998    46   16.0  18:20 ( 51, 23)

* 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.  9   3  2.39  -65 58.5  16.928  16.930    88   16.0  21:50 (  0,-11)  
Dec. 16   2 59.77  -65 51.5  16.940  16.906    86   16.0  21:20 (  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 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.  9  20 12.59   -7 34.5   0.457   0.763    48   16.2  18:18 ( 57, 28)  
Dec. 16  20 58.07    1 59.7   0.386   0.834    56   16.0  18:20 ( 62, 38)

* 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 January. 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.  9  15 18.53  -48 42.9   4.043   3.260    32   16.1   5:25 (320,-15)  
Dec. 16  15 29.92  -48 37.2   4.077   3.318    34   16.2   5:30 (322,-12)

* C/2022 S4 ( Lemmon )

Now it is 16.1 mag (Nov. 29, Ken-ichi Kadota). 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.  9   2  3.95  -27 40.7   3.044   3.560   113   16.1  20:52 (  0, 27)  
Dec. 16   1 57.18  -28 35.3   3.104   3.518   106   16.1  20:18 (  0, 26)

* 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.  9  23 17.42   66  8.4   1.811   2.369   112   16.1  18:18 (178, 59)  
Dec. 16  23 23.32   65 19.7   1.892   2.415   110   16.3  18:20 (173, 59)

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 17.4 mag (Dec. 2, 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.  9   9 24.03  -61  8.2   3.783   3.757    80   16.1   4:15 (  0, -6)  
Dec. 16   9 12.77  -63 51.1   3.762   3.768    82   16.1   3:37 (  0, -9)

* C/2022 V2 ( Lemmon )

Now it is 17.9 mag (Dec. 7, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. 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.  9  11 47.75   -5  2.8   2.095   2.108    77   16.3   5:25 (333, 46)  
Dec. 16  11 42.05   -8 24.3   1.985   2.126    84   16.3   5:30 (347, 46)

* 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.  9   3 27.57  -19 52.2   2.211   2.959   131   16.6  22:15 (  0, 35)  
Dec. 16   3 19.17  -18 46.9   2.186   2.887   127   16.3  21:40 (  0, 36)

* 199P/Shoemaker 4

Now it is 17.3 mag (Nov. 14, ATLAS Chile). Fading slowly. It will be unobservable in January. But it will be observable again in March in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  20 11.41  -33 31.0   3.684   3.040    43   16.4  18:18 ( 40,  8)  
Dec. 16  20 24.06  -33  6.7   3.756   3.054    39   16.5  18:20 ( 43,  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.  9   4 42.76  -12 39.0   6.332   7.155   144   16.6  23:31 (  0, 42)  
Dec. 16   4 40.08  -12 26.9   6.322   7.125   142   16.5  23:01 (  0, 43)

* 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.  9  22 13.66  -39  4.8   1.039   1.119    67   16.6  18:18 ( 15, 14)  
Dec. 16  21 49.03  -38 56.5   1.194   1.042    56   16.6  18:20 ( 25, 10)

* 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.  9   4 22.09  -62 54.6   4.231   4.411    94   16.6  23:08 (  0, -8)  
Dec. 16   4  5.04  -62 36.8   4.330   4.481    92   16.7  22:24 (  0, -8)

* 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). It stays 16 mag for a while. It will be unobservable in January. But it will be observable again in March in the Southern Hemisphere, or in April in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  20 51.19  -17 50.9   6.832   6.303    53   16.7  18:18 ( 42, 25)  
Dec. 16  20 55.36  -17 31.2   6.878   6.261    47   16.6  18:20 ( 47, 22)

* 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.  9   4 45.73   41 46.9   5.754   6.691   160   16.6  23:34 (180, 83)  
Dec. 16   4 42.70   41 44.2   5.763   6.690   158   16.6  23:04 (180, 83)

* 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.  9  13 36.97  -54 58.5   4.871   4.296    49   16.8   5:25 (335, -8)  
Dec. 16  13 48.46  -56 11.5   4.776   4.241    51   16.7   5:30 (339, -8)

* (3200) Phaethon

Fading gradually. 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.  9  21 13.26    7 20.2   1.075   1.165    68   16.7  18:18 ( 56, 49)  
Dec. 16  21 44.39    8 51.4   1.206   1.264    69   17.0  18:20 ( 57, 50)

* C/2022 U3 ( Bok )

Now it is 17.2 mag (Dec. 8, Ken-ichi Kadota). 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.  9   4 50.68   36  9.4   4.192   5.155   166   16.8  23:39 (180, 89)  
Dec. 16   4 46.98   35 30.6   4.181   5.136   164   16.8  23:08 (180, 90)

* 117P/Helin-Roman-Alu 1

Now it is 15.4 mag (Nov. 19, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag in March. 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.  9   0  5.72   -6 50.1   3.504   3.835   102   16.8  18:55 (  0, 48)  
Dec. 16   0  7.87   -6 16.3   3.624   3.850    95   16.9  18:30 (  0, 49)

* 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.  9   3 14.47  -76 44.9  10.452  10.314    79   16.8  22:00 (  0,-22)  
Dec. 16   3  0.63  -76 15.3  10.477  10.314    77   16.8  21:19 (  0,-21)

* 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 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.  9  14  0.70    6 46.8   4.883   4.361    52   16.9   5:25 (288, 35)  
Dec. 16  14  7.27    6 34.5   4.841   4.400    58   16.9   5:30 (294, 40)

* C/2020 Y2 ( ATLAS )

It brightened up to 14.1 mag in 2022 spring (Mar. 22, 2022, Chris Wyatt). Now it is 16.6 mag (Nov. 29, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag in April. 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.  9   1 27.77   -0 50.8   5.190   5.788   123   16.9  20:16 (  0, 54)  
Dec. 16   1 24.16   -0 24.7   5.344   5.836   115   17.0  19:45 (  0, 55)

* 237P/LINEAR

It brightened up to 11.8 mag in summer (June 17, Osamu Miyazaki). Now it is 16.5 mag (Nov. 14, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It will be fainter than 18 mag in January. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it will be unobservable in January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  21 24.70   -1 46.5   2.751   2.539    67   16.9  18:18 ( 45, 43)  
Dec. 16  21 35.91   -1 14.9   2.858   2.568    63   17.1  18:20 ( 50, 41)

* 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.  9  12 48.37    3 17.9   4.097   3.816    66   17.0   5:25 (308, 45)  
Dec. 16  12 54.05    2 50.6   3.983   3.800    72   16.9   5:30 (316, 49)

* 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 in January. 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.  9  23 32.43  -23 25.0   2.381   2.544    87   17.1  18:22 (  0, 32)  
Dec. 16  23 40.54  -22 42.1   2.550   2.622    83   17.4  18:20 (  5, 32)

* 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 will be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  12 57.31  -22 40.8   3.966   3.506    55   17.1   5:25 (324, 23)  
Dec. 16  13  6.25  -23 32.0   3.877   3.495    60   17.1   5:30 (330, 25)

* C/2022 R6 ( PanSTARRS )

Now it is 16.9 mag (Dec. 1, 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)  
Dec.  9   5  1.13  -41  5.0   7.283   7.768   116   17.2  23:49 (  0, 14)  
Dec. 16   4 58.32  -40 57.9   7.272   7.744   115   17.1  23:18 (  0, 14)

* 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.  9   3 24.61    4  6.7   2.292   3.185   150   17.3  22:13 (  0, 59)  
Dec. 16   3 21.38    4 15.8   2.355   3.199   143   17.4  21:42 (  0, 59)

* C/2022 U1 ( Leonard )

Now it is 16.2 mag (Dec. 2, D. Buczynski). 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.  9  22 43.89   45 52.5   3.962   4.298   103   17.3  18:18 (145, 76)  
Dec. 16  22 39.33   44 15.2   4.048   4.286    97   17.4  18:20 (127, 72)

* P/2001 Q6 ( 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 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)  
Dec.  9  23  6.93  -19  5.7   1.557   1.755    84   17.4  18:18 (  6, 36)  
Dec. 16  23  7.45  -14 45.0   1.595   1.705    78   17.3  18:20 ( 16, 39)

* 227P/Catalina-LINEAR

Now it is 18.3 mag (Dec. 5, ATLAS-HKO, Haleakala). 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.  9   7 41.93   33 43.6   0.955   1.840   143   17.5   2:34 (  0, 89)  
Dec. 16   7 43.91   34 45.6   0.894   1.811   149   17.3   2:09 (  0, 90)

* 150P/LONEOS

It brightens up to 16 mag from January to February. Now it is 17.4 mag (Dec. 8, Toshihiko Ikemura, Hirohisa Sato). Brightening slowly. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9   9  6.04    6 51.6   1.288   1.965   118   17.7   3:58 (  0, 62)  
Dec. 16   9  9.97    4 30.6   1.205   1.936   124   17.5   3:34 (  0, 59)

* 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. 4, ATLAS South Africa). It will brighten rapidly after this. 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.  9   2 45.91  -44 50.5   2.298   2.736   105   17.7  21:33 (  0, 10)  
Dec. 16   2 33.82  -42 40.9   2.264   2.656   102   17.5  20:54 (  0, 13)

* C/2020 F2 ( ATLAS )

Now it is 17.4 mag (Dec. 3, 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 be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  12 33.49   13 13.9   9.514   9.300    74   17.6   5:25 (302, 55)  
Dec. 16  12 33.20   13 30.9   9.406   9.313    81   17.6   5:30 (312, 61)

* 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 in January. In the Northern Hemisphere, it will be getting lower gradually. It locates somewhat 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.  9  21 30.28  -10 19.0   5.030   4.705    65   17.6  18:18 ( 37, 37)  
Dec. 16  21 35.33   -9 54.6   5.142   4.720    59   17.7  18:20 ( 44, 34)

* 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.  9   7 14.31    9 25.5   6.930   7.760   145   17.7   2:07 (  0, 64)  
Dec. 16   7  8.64    9 19.4   6.872   7.761   152   17.7   1:33 (  0, 64)

* 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 will be getting higher gradually. 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.  9  16  5.24   31 16.6   5.640   5.148    55   17.8   5:25 (247, 23)  
Dec. 16  16  9.39   31 60.0   5.641   5.197    58   17.8   5:30 (249, 28)

* 404P/2020 M6 ( Bressi )

Now it is 18.4 mag (Dec. 7, Toshihiko Ikemura, Hirohisa Sato). 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.  9   4 45.80   23 45.5   3.150   4.134   176   17.8  23:34 (  0, 79)  
Dec. 16   4 41.27   23 25.3   3.165   4.135   168   17.8  23:02 (  0, 78)

* 30P/Reinmuth 1

Now it is 17.1 mag (Dec. 3, Ken-ichi Kadota). 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.  9   1 22.08   -2 33.2   2.133   2.773   121   17.9  20:11 (  0, 53)  
Dec. 16   1 21.46   -2 10.2   2.181   2.735   114   17.9  19:43 (  0, 53)

* C/2023 T2 ( Borisov )

Now it is 18.1 mag (Dec. 4, ATLAS-HKO, Haleakala). 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.  9  20 53.19   75 14.2   1.525   2.012   104   18.0  18:18 (167, 46)  
Dec. 16  21 21.25   75 45.6   1.510   2.007   105   17.9  18:20 (167, 45)

* C/2023 V5 ( Leonard )

Tiny member of Comet C/1988 A1 ( Liller )'s group. Now it is 17.5 mag (Nov. 17, Giuseppe Pappa). It will fade out rapidly after this. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it is not observable now. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec.  9  18 49.76   26 12.6   0.810   0.852    55   19.3  18:18 (103, 30)  
Dec. 16  18 36.37   26 50.4   0.930   0.848    52   19.6  18:20 (108, 22)

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