Weekly Information about Bright Comets (2023 Dec. 23: North)

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 Updated on December 30, 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 7.4 mag (Dec. 24, 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. 23  11  4.52   14 33.9   0.538   1.264   108    7.2   5:00 (  0, 69)  
Dec. 30  11 26.84   13 22.0   0.525   1.265   110    7.2   4:55 (  0, 68)

* 12P/Pons-Brooks

It returns for the first time in 70 years. It will brighten up to 4.5 mag in 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. In the Northern Hemisphere, it will be unobservable in April. In the Southern Hemisphere, it is not observable now. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23  19 13.15   37 46.5   2.363   2.115    63    8.1  18:23 (118, 28)  
Dec. 30  19 31.24   37 44.4   2.283   2.025    62    7.9  18:27 (119, 26)

* C/2021 S3 ( PanSTARRS )

It is expected to brighten up to 8.5 mag in early 2024. Now it is 10.7 mag (Dec. 10, Taras Prystavski). 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. 23  14 17.90  -39  5.5   1.983   1.540    49    9.8   5:34 (330,  7)  
Dec. 30  14 43.23  -38  3.3   1.901   1.491    50    9.6   5:36 (330,  8)

* 144P/Kushida

It is expected to brighten up to 8.5 mag from January to February. Now it is 11.9 mag (Dec. 21, Ken-ichi Kadota). It will turn to fade out rapidly after brightening. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   2 55.24   14 41.0   0.578   1.452   135   11.7  20:49 (  0, 70)  
Dec. 30   3  2.69   14 25.8   0.588   1.432   129   10.9  20:30 (  0, 70)

* 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 12.2 mag (Dec. 22, 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. 23   8 57.49  -14  5.2   0.628   1.427   123   10.9   2:54 (  0, 41)  
Dec. 30   8 50.47  -14 33.6   0.652   1.486   129   11.3   2:20 (  0, 40)

* C/2020 V2 ( ZTF )

Now it is 11.8 mag (Dec. 16, Taras Prystavski). 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. 23  23 16.90  -41 48.9   3.635   3.365    66   12.1  18:23 ( 14, 12)  
Dec. 30  23 16.86  -41 25.3   3.788   3.419    60   12.2  18:27 ( 20, 10)

* 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 10.5 mag (Dec. 12, Thomas Lehmann). Fading rapidly. 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 April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23  22 57.61  -41 53.4   1.422   1.309    62   12.1  18:23 ( 17, 10)  
Dec. 30  23  6.80  -42 21.2   1.619   1.394    58   12.7  18:27 ( 21,  9)

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 11.3 mag (Dec. 17, Osamu Miyazaki). Fading slowly. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   5 46.69   -4 12.1   3.641   4.534   152   12.6  23:39 (  0, 51)  
Dec. 30   5 39.33   -3 15.5   3.715   4.596   150   12.7  23:04 (  0, 52)

* C/2022 E2 ( ATLAS )

It will brighten up to 12 mag from 2024 to 2025. Now it is 13.5 mag (Dec. 25, Giuseppe Pappa). 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. 23   9 20.04   11  7.6   3.643   4.357   131   13.0   3:17 (  0, 66)  
Dec. 30   9 12.27   12 28.4   3.517   4.325   140   12.9   2:42 (  0, 67)

* 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. 23  10 17.23  -40  8.7   4.172   4.338    93   13.2   4:14 (  0, 15)  
Dec. 30  10  7.93  -41 37.5   4.119   4.372    98   13.3   3:37 (  0, 13)

* 26P/Grigg-Skjellerup

Now it is 13.7 mag (Dec. 12, Kunihiro Shima). It will fade out rapidly after this. It will be fainter than 18 mag in February. It stays extremely low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23  15 47.89  -20  5.7   1.796   1.084    31   14.3   5:34 (303,  9)  
Dec. 30  16 19.34  -19 43.1   1.798   1.086    31   13.5   5:36 (302,  9)

* 29P/Schwassmann-Wachmann 1

Now it is 12.4 mag (Dec. 24, Osamu Miyazaki). It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   8 38.55   20 38.2   5.342   6.164   143   13.6   2:35 (  0, 76)  
Dec. 30   8 35.96   20 44.0   5.283   6.166   151   13.5   2:05 (  0, 76)

* C/2021 T4 ( Lemmon )

It brightened up to 7.8 mag in late July (July 20, Thomas Lehmann). Now it is 16.0 mag (Dec. 22, Yukihiro Sugiyama). Fading slowly. It will be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23  15 16.42   -6 38.7   3.057   2.436    43   13.8   5:34 (298, 24)  
Dec. 30  15 16.51   -5 46.1   3.013   2.504    50   13.9   5:36 (303, 30)

* 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). It will fade out rapidly after this. In the Northern Hemisphere, it will be unobservable in January. But it will be observable again in February. 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. 23  12 24.39  -50  1.6   2.245   2.101    68   14.0   5:34 (352,  4)  
Dec. 30  12 11.70  -52 11.1   2.248   2.209    75   14.2   5:36 (359,  3)

* C/2022 L2 ( ATLAS )

Now it is 15.5 mag (Dec. 22, Yukihiro Sugiyama). 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. 23  15 30.04  -16  2.8   3.550   2.820    36   14.1   5:34 (302, 15)  
Dec. 30  15 31.23  -17 21.5   3.438   2.800    42   14.0   5:36 (309, 19)

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 15.7 mag (Dec. 18, ATLAS Chile). It stays 15 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. 23  11 28.41  -48 25.1   7.108   6.971    78   14.2   5:25 (  0,  6)  
Dec. 30  11 28.69  -49 19.7   7.078   7.016    82   14.2   4:57 (  0,  6)

* 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 13.9 mag (Dec. 21, Yukihiro Sugiyama). It will brighten rapidly after this. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, 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. 23  14 57.02   -6 58.8   4.955   4.350    47   14.4   5:34 (302, 27)  
Dec. 30  15  0.31   -7 14.8   4.783   4.271    53   14.2   5:36 (307, 31)

* C/2021 G2 ( ATLAS )

Now it is 14.9 mag (Dec. 19, ATLAS Chile). 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. 23  12  3.37  -36 25.1   5.519   5.369    76   14.5   5:34 (355, 18)  
Dec. 30  12  6.77  -36 57.5   5.410   5.350    81   14.4   5:35 (  0, 18)

* 32P/Comas Sola

Now it is 14.3 mag (Dec. 12, Thomas Lehmann). 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. 23   2 42.90   17 54.1   1.491   2.280   133   14.7  20:37 (  0, 73)  
Dec. 30   2 42.30   18 24.3   1.529   2.253   126   14.7  20:09 (  0, 74)

* C/2020 K1 ( PanSTARRS )

It brightened up to 12.1 mag in spring (May 20, Jose Guilherme de S. Aguiar). Now it is 15.0 mag (Dec. 26, ATLAS Chile). Fading slowly. 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. 23   5 18.09  -85 36.7   3.982   3.776    70   14.7  22:59 (  0,-30)  
Dec. 30   4 25.84  -83 49.5   4.000   3.814    72   14.7  21:45 (  0,-29)

* 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 16.7 mag (Dec. 25, ATLAS Chile). It will turn to fade out rapidly after brightening. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   0 11.78  -13  7.6   0.581   1.115    86   15.3  18:23 (  5, 42)  
Dec. 30   0 23.41  -13 48.3   0.555   1.063    82   15.0  18:27 ( 12, 41)

* C/2023 X1 ( Leonard )

Bright new comet. Now it is 15.6 mag (Dec. 21, 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. 23  13 22.68   44 45.7   1.027   1.462    93   15.2   5:34 (237, 68)  
Dec. 30  13 46.98   55 29.9   1.045   1.546    99   15.5   5:36 (212, 64)

* 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 15.5 mag (Dec. 17, 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. 23  16 54.15   16 23.3   6.867   6.186    43   15.2   5:34 (262, 18)  
Dec. 30  16 59.90   16 43.9   6.867   6.225    46   15.2   5:36 (265, 23)

* C/2021 X1 ( Maury-Attard )

Now it is 15.8 mag (Dec. 13, Ken-ichi Kadota). 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. 23  22 31.26    3 24.4   4.001   3.791    70   15.3  18:23 ( 48, 48)  
Dec. 30  22 30.38    3 40.8   4.158   3.825    63   15.4  18:27 ( 57, 43)

* 226P/Pigott-LINEAR-Kowalski

Now it is 15.3 mag (Dec. 25, ATLAS Chile). 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. 23   0 42.72  -15 10.7   1.427   1.774    92   15.3  18:37 (  0, 40)  
Dec. 30   0 47.60  -10 32.9   1.493   1.774    89   15.4  18:27 (  4, 45)

* 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 15.5 mag (Dec. 18, Michael Jager). 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. 23   3 11.54  -17 24.9   2.171   2.814   121   16.1  21:05 (  0, 38)  
Dec. 30   3  4.94  -15 48.1   2.166   2.742   115   15.8  20:31 (  0, 39)

* 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. 23  18 50.85  -27 34.0   2.245   1.298    11   15.8  18:23 ( 64,-11)  
Dec. 30  19 13.37  -26 53.7   2.357   1.397     9   16.4  18:27 ( 66,-12)

* 471P/2023 KF3

Now it is 16.2 mag (Dec. 16, ATLAS-MLO, Mauna Loa). 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. 23  23 22.93    1 25.3   2.032   2.124    81   15.9  18:23 ( 28, 53)  
Dec. 30  23 35.17    2 31.2   2.106   2.125    77   15.9  18:27 ( 36, 52)

* 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 (Dec. 2, Taras Prystavski). 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. 23   2 57.46  -65 41.9  16.952  16.881    84   16.0  20:50 (  0,-11)  
Dec. 30   2 55.51  -65 30.0  16.963  16.857    82   16.0  20:21 (  0,-10)

* 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. 23  21 55.37   14  1.0   0.343   0.913    68   16.0  18:23 ( 69, 51)  
Dec. 30  23  6.65   26 22.1   0.337   0.997    82   16.1  18:27 ( 79, 65)

* C/2022 JK5 ( PanSTARRS )

It continues to be brightening even after the perihelion passage. Now it is 15.3 mag (Dec. 17, Ken-ichi Kadota). 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. 23  23 53.79  -15  6.1   3.568   3.569    82   16.1  18:23 ( 11, 39)  
Dec. 30  23 59.25  -13 53.5   3.707   3.612    76   16.3  18:27 ( 19, 39)

* 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. 23   1 51.48  -29 16.9   3.169   3.476    99   16.1  19:45 (  0, 26)  
Dec. 30   1 46.92  -29 47.6   3.238   3.435    93   16.1  19:13 (  0, 25)

* 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. 23  21  2.76  -13 35.6   2.599   2.006    43   16.1  18:23 ( 55, 21)  
Dec. 30  21 18.37  -12  6.4   2.657   2.016    40   16.2  18:27 ( 59, 20)

* C/2022 V2 ( Lemmon )

Now it is 17.5 mag (Dec. 28, ATLAS-MLO, Mauna Loa). 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. 23  11 34.04  -11 58.9   1.881   2.147    91   16.2   5:30 (  0, 43)  
Dec. 30  11 23.24  -15 45.6   1.784   2.170    99   16.1   4:52 (  0, 39)

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 17.1 mag (Dec. 28, Jean-Claude Merlin). It stays 17 mag for a while. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   8 57.42  -66 22.1   3.748   3.780    84   16.1   2:54 (  0,-11)  
Dec. 30   8 37.17  -68 36.1   3.742   3.793    85   16.2   2:06 (  0,-14)

* 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. 23  22 27.37    2 29.0   1.569   1.531    69   16.2  18:23 ( 48, 47)  
Dec. 30  22 52.92    3 36.3   1.679   1.607    68   16.7  18:27 ( 50, 47)

* C/2021 Y1 ( ATLAS )

It brightened up to 13 mag in early 2023. 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. 23  15 40.54  -48 31.9   4.103   3.376    37   16.2   5:34 (324,-10)  
Dec. 30  15 50.35  -48 26.8   4.118   3.435    40   16.3   5:36 (327, -7)

* 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. 23  22 41.61  -13 55.9   4.291   3.997    66   16.2  18:23 ( 32, 35)  
Dec. 30  22 45.06  -14 11.6   4.465   4.061    59   16.4  18:27 ( 39, 31)

* C/2023 S3 ( Lemmon )

Now it is 13.3 mag (Dec. 16, Michael Mattiazzo). Fading slowly. It will be unobservable in January. But it will be observable again in February. It is much brighter than this ephemeris recently. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23  21 30.50  -38 36.6   1.340   0.972    46   16.5  18:23 ( 34,  6)  
Dec. 30  21 15.52  -38 12.4   1.468   0.913    37   16.4  18:27 ( 41,  0)

* C/2023 C2 ( ATLAS )

It is expected to brighten up to 12.5 mag in 2024 summer. Now it is 17.1 mag (Dec. 20, E. Cortes). 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. 23  14  0.20  -57 25.7   4.677   4.186    54   16.6   5:34 (342, -7)  
Dec. 30  14 12.17  -58 40.6   4.575   4.131    57   16.5   5:36 (344, -7)

* C/2022 QE78 ( ATLAS )

Now it is 15.9 mag (Dec. 28, 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)  
Dec. 23   4 37.53  -12  9.9   6.324   7.094   138   16.5  22:31 (  0, 43)  
Dec. 30   4 35.16  -11 48.4   6.339   7.064   134   16.5  22:01 (  0, 43)

* 126P/IRAS

It brightened up to 13.6 mag in summer (July 16, Mitsunori Tsumura). Now it is 16.2 mag (Dec. 27, ATLAS-MLO, Mauna Loa). 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. 23  23 31.90   64 38.5   1.976   2.463   107   16.6  18:23 (168, 59)  
Dec. 30  23 42.64   64  5.1   2.063   2.511   105   16.8  18:27 (164, 59)

* 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. 23   4 39.84   41 38.5   5.786   6.690   154   16.6  22:33 (180, 83)  
Dec. 30   4 37.28   41 30.3   5.822   6.689   149   16.7  22:03 (180, 83)

* C/2022 U3 ( Bok )

Now it is 16.7 mag (Dec. 17, A. Diepvens). 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. 23   4 43.51   34 48.9   4.186   5.118   159   16.7  22:37 (  0, 90)  
Dec. 30   4 40.43   34  5.2   4.204   5.100   153   16.7  22:06 (  0, 89)

* 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. 23  12 59.31    2 26.8   3.866   3.785    77   16.9   5:34 (325, 52)  
Dec. 30  13  4.09    2  7.0   3.747   3.770    83   16.8   5:36 (335, 55)

* C/2019 E3 ( ATLAS )

Very far object. Now it is 16.8 mag (Dec. 14, 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)  
Dec. 23   2 48.63  -75 39.4  10.501  10.315    76   16.8  20:40 (  0,-21)  
Dec. 30   2 38.54  -74 58.4  10.525  10.316    75   16.8  20:03 (  0,-20)

* 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. 15, Jean-Claude Merlin). 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. 23   3 49.79  -62  2.1   4.434   4.550    90   16.8  21:41 (  0, -7)  
Dec. 30   3 36.68  -61 14.0   4.542   4.620    88   16.9  21:01 (  0, -6)

* 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. 23  14 13.43    6 26.4   4.794   4.440    63   16.9   5:34 (299, 44)  
Dec. 30  14 19.17    6 22.8   4.742   4.480    68   16.9   5:36 (306, 48)

* C/2022 T1 ( Lemmon )

Now it is 18.2 mag (Dec. 24, ATLAS Chile). 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. 23  13 14.90  -24 20.8   3.786   3.484    64   17.0   5:34 (335, 26)  
Dec. 30  13 23.24  -25  6.9   3.691   3.475    69   16.9   5:36 (341, 27)

* 227P/Catalina-LINEAR

Now it is 17.3 mag (Dec. 25, ATLAS-HKO, Haleakala). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. It stays extremely low in the Southern Hemisphere. But it will become high in spring. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   7 44.12   35 49.9   0.843   1.783   154   17.1   1:41 (180, 89)  
Dec. 30   7 42.62   36 53.0   0.801   1.756   159   17.0   1:12 (180, 88)

* 117P/Helin-Roman-Alu 1

Now it is 16.5 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It stays 18 mag for a while. 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. 23   0 10.70   -5 39.0   3.745   3.866    89   17.0  18:23 (  7, 49)  
Dec. 30   0 14.15   -4 58.8   3.866   3.882    83   17.1  18:27 ( 18, 49)

* 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 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. 23   1 21.25    0  3.7   5.504   5.884   108   17.1  19:15 (  0, 55)  
Dec. 30   1 19.03    0 34.0   5.670   5.932   100   17.1  18:45 (  0, 56)

* 150P/LONEOS

It brightens up to 16 mag from January to February. Now it is 16.8 mag (Dec. 16, Hidenori Nohara). 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. 23   9 12.45    2  3.5   1.128   1.910   129   17.3   3:09 (  0, 57)  
Dec. 30   9 13.38   -0 27.9   1.060   1.885   134   17.1   2:42 (  0, 55)

* C/2022 R6 ( PanSTARRS )

Now it is 16.9 mag (Dec. 22, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it will be unobservable in April. 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. 23   4 55.60  -40 44.2   7.268   7.720   113   17.1  22:48 (  0, 14)  
Dec. 30   4 53.07  -40 24.2   7.270   7.696   112   17.1  22:18 (  0, 15)

* 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 16.7 mag (Dec. 21, Ken-ichi Kadota). It will brighten rapidly after this. In the Northern Hemisphere, it will be getting lower gradually. But it will be getting higher again after April. 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. 23  23  8.98   -9  7.2   1.607   1.640    74   17.2  18:23 ( 27, 42)  
Dec. 30  23 12.23   -4 52.6   1.649   1.596    69   17.1  18:27 ( 38, 43)

* C/2023 V4 ( Camarasa-Duszanowicz )

It is expected to brighten up to 13 mag in early summer in 2024. Now it is 17.0 mag (Dec. 22, 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. 23   2 23.66  -40  8.5   2.241   2.578    98   17.4  20:17 (  0, 15)  
Dec. 30   2 15.38  -37 15.7   2.223   2.499    94   17.2  19:41 (  0, 18)

* (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. 23  22 10.58   10  6.4   1.344   1.356    69   17.3  18:23 ( 60, 50)  
Dec. 30  22 33.13   11 11.1   1.487   1.442    67   17.5  18:27 ( 64, 49)

* 237P/LINEAR

It brightened up to 11.8 mag in summer (June 17, Osamu Miyazaki). Now it is 17.3 mag (Dec. 15, 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. 23  21 47.20   -0 39.1   2.964   2.598    59   17.4  18:23 ( 56, 38)  
Dec. 30  21 58.51    0  0.6   3.068   2.629    54   17.6  18:27 ( 61, 35)

* 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. 23  22 36.20   42 46.8   4.138   4.275    91   17.4  18:23 (118, 67)  
Dec. 30  22 34.23   41 28.3   4.230   4.265    85   17.4  18:27 (114, 61)

* 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. 23   3 19.01    4 31.3   2.430   3.214   136   17.5  21:12 (  0, 60)  
Dec. 30   3 17.59    4 52.6   2.514   3.229   129   17.6  20:44 (  0, 60)

* C/2020 F2 ( ATLAS )

Now it is 17.5 mag (Dec. 16, ATLAS-MLO, Mauna Loa). It stays 18 mag for a while. In the Northern Hemisphere, it stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23  12 32.56   13 50.7   9.296   9.326    88   17.6   5:34 (326, 65)  
Dec. 30  12 31.56   14 13.3   9.186   9.339    95   17.6   5:36 (344, 68)

* C/2021 A9 ( PanSTARRS )

Now it is 17.5 mag (Dec. 14, Jean-Claude Merlin). 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. 23   7  2.71    9 14.7   6.831   7.761   159   17.7   1:00 (  0, 64)  
Dec. 30   6 56.60    9 11.5   6.808   7.762   164   17.7   0:26 (  0, 64)

* 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). It will fade out rapidly after this. 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. 23  23 48.75  -21 56.2   2.718   2.700    78   17.8  18:23 ( 11, 32)  
Dec. 30  23 57.04  -21  8.3   2.885   2.777    73   18.1  18:27 ( 17, 32)

* 30P/Reinmuth 1

Now it is 17.1 mag (Dec. 13, 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 lower gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   1 22.06   -1 39.1   2.234   2.698   107   17.8  19:16 (  0, 54)  
Dec. 30   1 23.87   -1  1.0   2.289   2.661   101   17.8  18:50 (  0, 54)

* C/2023 T2 ( Borisov )

Now it is 17.2 mag (Dec. 19, ATLAS-MLO, Mauna Loa). 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. 23  21 59.97   76 17.3   1.486   1.995   106   17.9  18:23 (168, 45)  
Dec. 30  22 47.94   76 38.4   1.477   1.997   106   17.9  18:27 (170, 46)

* 404P/2020 M6 ( Bressi )

Now it is 18.2 mag (Dec. 26, Giuseppe Pappa). 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. 23   4 37.05   23  5.0   3.195   4.135   160   17.9  22:30 (  0, 78)  
Dec. 30   4 33.33   22 45.2   3.239   4.136   152   17.9  21:59 (  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. 23  16 13.38   32 50.0   5.636   5.246    61   17.9   5:34 (251, 34)  
Dec. 30  16 17.16   33 46.8   5.626   5.296    65   17.9   5:36 (252, 39)

* P/2023 M4 ( ATLAS )

Now it is 17.5 mag (Dec. 26, Giuseppe Pappa). Fading slowly. 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. 23  21 40.68   -9 27.8   5.248   4.735    53   17.9  18:23 ( 50, 31)  
Dec. 30  21 46.29   -8 58.9   5.348   4.749    48   18.0  18:27 ( 56, 27)

* 216P/LINEAR

Now it is 18.5 mag (Dec. 21, Giuseppe Pappa). 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. 23  11 46.08    8  7.1   1.775   2.130    96   18.0   5:34 (355, 63)  
Dec. 30  11 54.07    7  3.8   1.697   2.128   101   17.9   5:23 (  0, 62)

* (468861) 2013 LU28

Far asteroid moving along a cometary orbit. It brightens up to 18 mag from 2024 to 2025. 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)  
Dec. 23   9  6.24   50 13.4   8.074   8.803   135   18.0   3:03 (180, 75)  
Dec. 30   8 59.95   50 30.2   8.016   8.798   140   17.9   2:30 (180, 75)

* P/2011 NO1 ( Elenin )

First return of a new periodic comet which was discovered in 2011, half a year after the perihelion passage. It is expected to brighten up to 14.5 mag in spring. It will brighten rapidly after this. It stays observable in good condition. Maik Meyer pointed out the identification of Asteroid 2023 WM26 and this comet. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23   8 53.29   18 49.7   1.259   2.109   140   18.2   2:50 (  0, 74)  
Dec. 30   8 51.84   17 50.5   1.149   2.046   147   17.9   2:21 (  0, 73)

* P/2018 P3 ( PanSTARRS )

Now it is 19.9 mag (Dec. 22, Giuseppe Pappa). Fading slowly. It locates somewhat low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 23  22 30.96  -16 23.8   1.963   1.751    62   18.3  18:23 ( 34, 32)  
Dec. 30  22 47.19  -14 19.2   2.016   1.751    60   18.3  18:27 ( 39, 32)

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