Weekly Information about Bright Comets (2025 Dec. 20: North)

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 Updated on December 20, 2025
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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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* 24P/Schaumasse

Now it is 10.7 mag (Dec. 18, Osamu Miyazaki). It will turn to fade out rapidly after the peak. 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. 20  11 52.93   16 43.1   0.609   1.211    96    8.7   5:32 (341, 71)  
Dec. 27  12 26.53   15 24.7   0.597   1.195    95    8.4   5:36 (340, 69)

* C/2024 E1 ( Wierzchos )

It was originally expected to brighten up to 5 mag in January. But actually, the brightness evolution is slower than originally expected. It will be 8 mag at best. Now it is 9.6 mag (Dec. 10, Mike Olason). It brightens up to 7.5 mag, but it will turn to fade out rapidly after that. Now it is not observable. It will appear 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. 20  18 25.75  -18 13.8   1.849   0.894     9   10.0  18:22 ( 73, -9)  
Dec. 27  18 47.03  -22 47.9   1.760   0.788     5    9.5  18:26 ( 71,-13)

* C/2025 A6 ( Lemmon )

It brightened up to 3.7 mag in late October (Oct. 26, Juan Jose Gonzalez). Fading rapidly. Now it is not observable. It will appear soon in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  17 12.33  -35 13.9   1.967   1.044    14   10.3   5:32 (302,-17)  
Dec. 27  17 12.13  -37 39.5   2.027   1.161    20   11.0   5:36 (307,-13)

* C/2025 T1 ( ATLAS )

Now it is 9.8 mag (Dec. 18, Osamu Miyazaki). It will fade out rapidly after this. In the Northern Hemisphere, it will be unobservable in January. In the Southern Hemisphere, it is not observable now, but it will appear in March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  20 13.48    5 56.4   1.595   1.145    45   10.7  18:22 ( 77, 27)  
Dec. 27  20 28.46    1 31.5   1.758   1.179    39   11.2  18:26 ( 76, 21)

* 3I/2025 N1 ( ATLAS )

Third interstellar object in history following 1I/'Oumuamua and 2I/Borisov. The eccentricity is extremely big as 6. It approached to Sun down to 1.38 a.u. in late October. It brightened up to 8.9 mag in November (Nov. 12, Toshiyuki Takahashi). Now it is 11.2 mag (Dec. 18, Osamu Miyazaki). Fading rapidly. It will be fainter than 18 mag in March. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  10 42.57    7 23.8   1.798   2.309   108   11.8   4:50 (  0, 62)  
Dec. 27  10  9.07   10  7.0   1.825   2.516   124   12.4   3:49 (  0, 65)

* 210P/Christensen

It brightened up to 9.5 mag in late November (Nov. 28, Michael Jager, Gerald Rhemann, E. Prosperi). Now it is 11.6 mag (Dec. 18, Osamu Miyazaki). Fading rapidly. It will be fainter than 18 mag in March. It will be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  14 45.22   -8 32.2   0.950   0.770    46   11.9   5:32 (303, 26)  
Dec. 27  14 57.82   -8 28.8   1.032   0.870    51   12.8   5:36 (307, 29)

* 240P/NEAT

Now it is 12.1 mag (Dec. 16, Osamu Miyazaki). Fading gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually. The component B is brightening rapidly. Now it is bright as 14.3 mag (Dec. 7, Andrew Pearce). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   3 22.83   13  1.2   1.249   2.122   143   12.2  21:26 (  0, 68)  
Dec. 27   3 19.79   14 50.8   1.300   2.122   136   12.3  20:56 (  0, 70)

* 88P/Howell

Brightening gradually. It stays extremely low in the Northern Hemisphere. But it will become high in summer. In the Southern Hemisphere, it is not observable now, but it will appear in January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  16 14.63  -21  0.9   2.524   1.658    22   12.5   5:32 (297,  2)  
Dec. 27  16 36.49  -22  1.5   2.462   1.618    24   12.3   5:36 (299,  3)

* 235P/LINEAR

It became brighter than expected. Now it is 13.5 mag (Nov. 29, Ken-ichi Kadota). It stays 13 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in spring. 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. 20  14  8.48  -14 18.4   2.405   1.978    53   13.3   5:32 (315, 27)  
Dec. 27  14 24.29  -15 13.6   2.345   1.978    56   13.2   5:36 (319, 29)

* C/2025 R2 ( SWAN )

It brightened up to 5.2 mag in October (Oct. 11, Virgilio Gonano). Now it is 12.9 mag (Dec. 18, Toru Yusa). Fading rapidly. It will be fainter than 18 mag in March. 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. 20   0 41.76   10 35.2   1.441   1.952   105   13.3  18:46 (  0, 66)  
Dec. 27   0 52.59   11 23.4   1.622   2.055   101   13.8  18:30 (  0, 67)

* C/2022 N2 ( PanSTARRS )

Now it is 13.0 mag (Dec. 16, Osamu Miyazaki). Fading slowly. 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. 20   3 12.36   24 58.2   3.184   4.021   143   13.6  21:16 (  0, 80)  
Dec. 27   3 11.82   24 45.5   3.267   4.040   136   13.6  20:48 (  0, 80)

* C/2025 K1 ( ATLAS )

It brightened up to 9.3 mag in November (Nov. 2, Virgilio Gonano). Now it is 12.6 mag (Dec. 11, Osamu Miyazaki). Fading rapidly. 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 be unobservable in February. The nucleus is split into three components. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   1  2.34   44 57.9   0.929   1.645   118   13.7  19:06 (180, 80)  
Dec. 27   0 57.68   40 20.1   1.147   1.762   111   14.5  18:34 (180, 85)

* 29P/Schwassmann-Wachmann 1

It brightened in outburst on Dec. 5. Now it is 12.6 mag (Dec. 18, Osamu Miyazaki). It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  11 33.25   -2 54.0   6.177   6.305    92   14.0   5:32 (357, 52)  
Dec. 27  11 34.10   -3  9.9   6.064   6.306    99   13.9   5:13 (  0, 52)

* C/2022 QE78 ( ATLAS )

Now it is 14.4 mag (Nov. 29, Purple Mountain Observatory, XuYi Station). It stays 15 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. 20   9 27.03   23  7.9   4.832   5.525   130   14.3   3:34 (  0, 78)  
Dec. 27   9 26.47   23 50.7   4.762   5.532   137   14.3   3:06 (  0, 79)

* C/2025 L1 ( ATLAS )

It is expected to brighten up to 13.5 mag and to be observable in good condition in 2026 spring. Brightening slowly. 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. 20  15 33.51  -40 39.0   2.440   1.709    33   14.8   5:32 (318, -5)  
Dec. 27  15 40.36  -38 50.1   2.364   1.694    37   14.7   5:36 (320,  0)

* C/2021 G2 ( ATLAS )

Now it is 14.4 mag (Oct. 11, 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 January. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  16 40.78   -0 21.6   6.951   6.107    28   14.8   5:32 (277,  9)  
Dec. 27  16 46.22   -0  3.1   6.938   6.136    32   14.8   5:36 (280, 14)

* C/2024 J3 ( ATLAS )

It will brighten up to 13 mag in 2026. Now it is 14.9 mag (Nov. 17, Alfons Diepvens). It stays 14 mag for a while. In the Northern Hemisphere, it will be unobservable temporarily in January. 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. 20  19  6.19   -5 33.8   5.712   4.842    25   14.8  18:22 ( 78,  7)  
Dec. 27  19 11.22   -4 51.0   5.706   4.807    21   14.8  18:26 ( 83,  2)

* C/2024 T5 ( ATLAS )

Now it is 14.5 mag (Dec. 15, ATLAS Chile). It stays 14 mag for a while. In the Northern Hemisphere, it will be unobservable in March. In the Southern Hemisphere, it stays observable in good condition. It is expected to brighten up to 11 mag in winter between 2026 and 2027. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   2 38.88  -42 47.5   5.457   5.716   100   14.8  20:42 (  0, 12)  
Dec. 27   2 37.01  -41 48.0   5.477   5.676    96   14.8  20:13 (  0, 13)

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 14.3 mag (Nov. 22, Thomas Lehmann). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. In the Northern Hemisphere, it is not observable until 2030. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   5  7.71  -74 57.8  14.551  14.436    81   14.9  23:08 (  0,-20)  
Dec. 27   5  2.72  -74 54.3  14.537  14.414    80   14.9  22:36 (  0,-20)

* 78P/Gehrels 2

It will brighten up to 12 mag in 2026 summer. Now it is 16.3 mag (Dec. 14, Catalina Sky Survey). Brightening gradually. 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. 20  21 17.56  -11 19.2   2.998   2.489    50   15.1  18:22 ( 51, 27)  
Dec. 27  21 29.05  -10 37.0   3.035   2.460    46   15.0  18:26 ( 56, 25)

* C/2023 R1 ( PanSTARRS )

Now it is 15.3 mag (Dec. 4, Ken-ichi Kadota). It stays 15 mag for a while. In the Northern Hemisphere, it will be unobservable temporarily in January. 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. 20  19 17.54   -1  4.1   4.531   3.718    30   15.3  18:22 ( 80, 12)  
Dec. 27  19 19.49   -1 33.8   4.562   3.701    25   15.3  18:26 ( 84,  5)

* C/2024 R4 ( PanSTARRS )

Brightening rapidly. It is expected to brighten up to 12 mag from 2027 to 2028. Now it is 16.0 mag (Nov. 17, Alfons Diepvens). It stays 16 mag for a while. In the Northern Hemisphere, it will be getting lower gradually. But it will be getting higher again after February. In the Southern Hemisphere, it is not observable now, but it will appear in April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  21 30.47   20 57.5   7.166   6.882    69   15.9  18:22 ( 81, 51)  
Dec. 27  21 31.96   21  0.9   7.217   6.844    64   15.9  18:26 ( 86, 45)

* C/2022 E2 ( ATLAS )

It was observed at 12-13 mag for a long time in 2024. Now it is 15.8 mag (Dec. 10, Ken-ichi Kadota). Fading slowly. 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, but it will appear in April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  22 27.67   33 46.8   5.375   5.415    87   16.0  18:22 ( 95, 67)  
Dec. 27  22 28.87   32 40.9   5.520   5.457    81   16.1  18:26 ( 96, 61)

* C/2025 Q3 ( ATLAS )

Now it is 15.6 mag (Dec. 10, Hidenori Nohara). Fading slowly. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in March. 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. 20   2 15.58   -0 21.5   1.570   2.257   122   16.1  20:19 (  0, 54)  
Dec. 27   2  9.42   -4  5.3   1.659   2.230   112   16.1  19:45 (  0, 51)

* C/2022 R6 ( PanSTARRS )

Now it is 16.2 mag (Dec. 15, ATLAS South Africa). It stays 16 mag for a while. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   8 56.72  -11 49.3   6.030   6.612   122   16.1   3:03 (  0, 43)  
Dec. 27   8 55.20  -11 34.4   5.956   6.617   128   16.1   2:34 (  0, 43)

* 40P/Vaisala 1

Now it is 15.4 mag (Dec. 4, Ken-ichi Kadota). It stays 17 mag for a while. 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. 20  14 50.13   -7 25.3   2.404   1.864    46   16.5   5:32 (301, 26)  
Dec. 27  15  7.20   -8 19.2   2.372   1.880    49   16.5   5:36 (305, 28)

* C/2025 J1 ( Borisov )

Now it is 16.2 mag (Dec. 17, Yukihiro Sugiyama). It stays 16 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   9 27.47   79 13.0   3.329   3.908   119   16.5   3:37 (180, 46)  
Dec. 27   8 33.91   79 43.0   3.274   3.883   121   16.5   2:18 (180, 45)

* 493P/2024 Q2 ( LONEOS )

Now it is 16.2 mag (Dec. 17, Yukihiro Sugiyama). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   4 37.78   53 37.8   2.965   3.826   146   16.5  22:41 (180, 71)  
Dec. 27   4 32.40   53 19.4   2.989   3.825   143   16.5  22:08 (180, 72)

* 261P/Larson

Now it is 16.2 mag (Dec. 14, Catalina Sky Survey). Fading slowly. It will be fainter than 18 mag in April. It will be unobservable in February 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. 20  22  0.25   -7  4.0   2.284   2.015    61   16.5  18:22 ( 44, 37)  
Dec. 27  22 14.50   -5 45.5   2.346   2.014    58   16.5  18:26 ( 50, 36)

* 145P/Shoemaker-Levy 5

Now it is 16.5 mag (Dec. 2, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  23 16.47   -6 46.7   1.852   1.931    79   16.5  18:22 ( 22, 46)  
Dec. 27  23 28.00   -4 48.4   1.909   1.918    75   16.5  18:26 ( 30, 46)

* C/2024 A1 ( ATLAS )

Now it is 16.2 mag (Dec. 18, D. Buczynski). Fading slowly. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable soon. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   8 36.62   52 14.6   3.432   4.209   137   16.5   2:44 (180, 73)  
Dec. 27   8 27.51   54 28.6   3.423   4.233   141   16.5   2:08 (180, 71)

* C/2023 C2 ( ATLAS )

It brightened up to 12.7 mag in 2024 summer (Aug. 7, 2024, Thomas Lehmann). Now it is 15.9 mag (Dec. 13, Alfons Diepvens). Fading slowly. 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 never be observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  22 40.94   49 12.9   4.504   4.724    96   16.5  18:22 (136, 67)  
Dec. 27  22 47.45   48 45.7   4.624   4.780    93   16.6  18:26 (131, 64)

* 164P/Christensen

Now it is 16.8 mag (Dec. 4, Ken-ichi Kadota). Fading slowly. 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. 20  11 21.03   21 15.6   2.061   2.501   104   16.6   5:27 (  0, 76)  
Dec. 27  11 24.61   21 59.6   2.016   2.542   111   16.6   5:03 (  0, 77)

* C/2023 H5 ( Lemmon )

Now it is 16.6 mag (Dec. 13, Alfons Diepvens). It stays 17 mag for a while. In the Southern Hemisphere, it will never be observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  17 47.76   62 46.9   4.500   4.542    86   16.7   5:32 (211, 29)  
Dec. 27  18  9.37   62 33.6   4.523   4.560    85   16.7   5:36 (212, 29)

* 43P/Wolf-Harrington

Now it is 16.5 mag (Dec. 15, Alfons Diepvens). 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. 20  11  6.99   -5 48.4   2.314   2.633    97   16.7   5:13 (  0, 49)  
Dec. 27  11 10.86   -6 42.0   2.244   2.652   103   16.7   4:49 (  0, 48)

* C/2025 R3 ( PanSTARRS )

It is expected to brighten up to 7 mag in April. Now it is 17.3 mag (Dec. 10, Purple Mountain Observatory, XuYi Station). It will brighten rapidly after this. It will be unobservable soon 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. At the high light, it is observable in the low sky before the perihelion passage in the Northern Hemisphere, or after the perihelion in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  22 18.21   22 42.2   2.259   2.295    79   16.9  18:22 ( 73, 61)  
Dec. 27  22 15.06   21 23.3   2.287   2.195    72   16.7  18:26 ( 79, 54)

* C/2023 F3 ( ATLAS )

Now it is 16.7 mag (Dec. 17, ATLAS Chile). 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. 20  10 51.72  -24 50.8   5.589   5.720    92   16.8   4:58 (  0, 30)  
Dec. 27  10 47.40  -24 52.4   5.493   5.742    99   16.8   4:26 (  0, 30)

* 195P/Hill

Now it is 16.9 mag (Nov. 22, Kunihiro Shima). It stays 17 mag for a while. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   9 58.14  -29 55.5   4.202   4.484   100   16.8   4:04 (  0, 25)  
Dec. 27   9 57.78  -30 54.0   4.130   4.488   105   16.8   3:36 (  0, 24)

* 47P/Ashbrook-Jackson

Now it is 16.4 mag (Nov. 27, Andrew Pearce). Fading slowly. It will be fainter than 18 mag in April. It will be unobservable in February in the Southern Hemisphere, or in March in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  23  9.19   -2 52.4   2.838   2.824    79   16.8  18:22 ( 27, 49)  
Dec. 27  23 16.44   -1 48.1   2.934   2.829    74   16.9  18:26 ( 36, 47)

* C/2023 X2 ( Lemmon )

Now it is 17.0 mag (Nov. 29, Ken-ichi Kadota). It stays 17 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. 20  17 19.40   84 60.0   4.691   5.089   108   16.8   5:32 (186, 35)  
Dec. 27  18  7.93   84 18.5   4.704   5.089   107   16.8   5:36 (187, 35)

* C/2023 RS61 ( PanSTARRS )

Although it is around 20 mag usually, now it is bright in outburst. Now it is 17.2 mag (Nov. 11, ATLAS-HKO, Haleakala). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in March. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   2 45.11   37 20.2   8.038   8.793   137   17.0  20:49 (180, 88)  
Dec. 27   2 43.72   37  5.2   8.101   8.784   131   17.0  20:20 (180, 88)

* 93P/Lovas 1

Now it is 18.1 mag (Dec. 8, Catalina Sky Survey). Brightening slowly. It will be unobservable in January in the Southern Hemisphere, or in March in the Northern Hemisphere. It will brighten up to 15.5 mag in spring. But it is not observable around the perihelion passage. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  21 53.87  -10 42.5   2.488   2.153    58   17.3  18:22 ( 44, 33)  
Dec. 27  22  5.17   -9 17.3   2.519   2.113    54   17.2  18:26 ( 49, 31)

* C/2019 E3 ( ATLAS )

Very far object. Now it is 16.6 mag (Oct. 19, ATLAS Chile). It stays 17 mag for a while. 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. 20   0  5.41  -52 15.3  11.322  11.087    73   17.2  18:22 (  2,  3)  
Dec. 27   0  4.87  -51 32.0  11.410  11.101    69   17.2  18:26 (  7,  3)

* 302P/Lemmon-PanSTARRS

It brightened very rapidly, and it became brighter than expected. Now it is 16.5 mag (Dec. 18, A. Sankovich). Fading slowly. 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 be getting lower gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   0 24.70   -4 14.8   3.282   3.523    95   17.2  18:29 (  0, 51)  
Dec. 27   0 28.40   -3 39.7   3.395   3.533    89   17.3  18:26 (  8, 51)

* 123P/West-Hartley

It will brighten up to 15 mag from autumn to winter in 2026. Now it is 17.6 mag (Dec. 14, Purple Mountain Observatory, XuYi Station). 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. 20   3 29.86   27 13.0   2.060   2.941   147   17.3  21:33 (  0, 82)  
Dec. 27   3 25.10   27 15.3   2.088   2.911   139   17.2  21:01 (  0, 82)

* (306173) 2010 NK83

Peculiar asteroid moving along a cometary orbit. Now it is 18.1 mag (Oct. 5, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in March. 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. 20   8  6.44   21 39.6   1.642   2.536   148   17.4   2:13 (  0, 77)  
Dec. 27   8  3.91   22 28.7   1.617   2.550   156   17.3   1:43 (  0, 77)

* C/2024 X2 ( ATLAS )

Now it is 17.9 mag (Dec. 15, ATLAS South Africa). Fading slowly. It will be fainter than 18 mag in March. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   9  4.63    0 24.2   3.260   3.940   127   17.3   3:11 (  0, 55)  
Dec. 27   8 57.62    1 55.5   3.188   3.962   136   17.3   2:37 (  0, 57)

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 17.0 mag (Dec. 1, Alfons Diepvens). 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. 20   5 53.41   30 39.1   9.234  10.210   172   17.5   0:01 (  0, 86)  
Dec. 27   5 49.92   30 46.2   9.290  10.259   169   17.5  23:25 (  0, 86)

* 48P/Johnson

Now it is 16.5 mag (Dec. 14, ATLAS Chile). Fading gradually. 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. 20   3  9.28    4  1.8   2.109   2.902   136   17.5  21:13 (  0, 59)  
Dec. 27   3  7.42    4 38.1   2.207   2.932   129   17.7  20:43 (  0, 60)

* C/2024 G2 ( ATLAS )

Now it is 17.8 mag (Nov. 14, W. Hasubick). It stays 18 mag for a while. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  12 12.57  -10 50.9   5.599   5.528    80   17.7   5:32 (344, 43)  
Dec. 27  12 12.10  -10 20.2   5.484   5.542    88   17.6   5:36 (355, 44)

* C/2019 U5 ( PanSTARRS )

Now it is 17.2 mag (Nov. 26, Andrew Pearce). It stays 18 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   4 56.47  -47 42.4   8.424   8.775   107   17.7  22:59 (  0,  7)  
Dec. 27   4 50.43  -47 25.1   8.493   8.820   106   17.7  22:25 (  0,  8)

* 276P/Vorobjov

Now it is 17.7 mag (Nov. 25, ATLAS-MLO, Mauna Loa). Fading slowly. It will be fainter than 18 mag in February. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20   6 57.42    4 49.6   3.319   4.234   155   17.7   1:04 (  0, 60)  
Dec. 27   6 53.40    4 43.1   3.308   4.246   159   17.7   0:33 (  0, 60)

* 217P/LINEAR

NkYk1912JulyIt brightened up to 12.1 mag in early summer (June 10, Taras Prystavski). Now it is 16.4 mag (Dec. 11, Hidenori Nohara). Fading gradually. 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. 20   9 13.73   14 17.3   1.859   2.616   131   17.7   3:20 (  0, 69)  
Dec. 27   9  9.28   15  2.8   1.843   2.671   139   17.8   2:48 (  0, 70)

* P/2023 S1 ( PanSTARRS )

It brightened up to 13.7 mag in last winter (Jan. 4, 2025, W. Pei). It stays 18 mag for a while. It locates somewhat low in the Northern Hemisphere. 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. 20  14 25.46  -22  5.6   3.705   3.121    47   17.7   5:32 (316, 19)  
Dec. 27  14 34.40  -23  0.9   3.649   3.141    52   17.8   5:36 (321, 21)

* (468861) 2013 LU28

Peculiar asteroid moving along a cometary orbit. It brightened up to 17 mag from 2024 to 2025. Now it is 17.8 mag (Oct. 5, ATLAS-HKO, Haleakala). 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. 20   6 27.43   22 21.3   8.301   9.275   171   17.9   0:35 (  0, 77)  
Dec. 27   6 22.81   22  5.9   8.305   9.288   178   17.8   0:03 (  0, 77)

* C/2020 K1 ( PanSTARRS )

It brightened up to 12.1 mag in 2023 spring (May 20, 2023, Jose Guilherme de S. Aguiar). 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. 20   6 15.82  -20 21.8   7.906   8.639   135   17.8   0:23 (  0, 35)  
Dec. 27   6 12.09  -20  5.4   7.945   8.685   136   17.8  23:47 (  0, 35)

* 60P/Tsuchinshan 2

The condition of this apparition is bad. It must have brightened up to 16 mag in summer, but it was not observable. Fading gradually. It will be fainter than 18 mag soon. It locates somewhat low in the Northern Hemisphere. 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. 20  14 15.57  -16 31.2   2.653   2.170    50   17.9   5:32 (315, 25)  
Dec. 27  14 27.66  -17 33.3   2.623   2.209    54   18.0   5:36 (320, 26)

* 489P/Denning

It had been lost for 113 years. It passed the perihelion on Dec. 4. It brightened up to 18 mag in outburst in 2007. Brightening slowly. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 20  12  4.25    4 20.8   1.247   1.571    88   22.0   5:32 (342, 58)  
Dec. 27  12 19.25    2 40.0   1.209   1.582    91   21.9   5:36 (350, 57)

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