Weekly Information about Bright Comets (2025 Dec. 13: South)

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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 Southern 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 brightens up to 8 mag, but it will turn to fade out rapidly after that. 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. 13  11 18.10   17 51.8   0.628   1.234    97    9.1   2:53 (226, 22)  
Dec. 20  11 52.93   16 43.1   0.609   1.211    96    8.7   2:55 (228, 22)

* 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. 13  17 12.48  -32 38.2   1.884   0.928     9    9.4   2:53 (322,-10)  
Dec. 20  17 12.33  -35 13.9   1.967   1.044    14   10.3   2:55 (319, -4)

* 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. 13  18  7.20  -13 56.7   1.928   1.005    14   10.4  20:54 ( 58,-17)  
Dec. 20  18 25.75  -18 13.8   1.849   0.894     9   10.0  20:59 ( 52,-17)

* 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 getting lower gradually after this, and 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. 13  19 55.22   11 25.6   1.433   1.122    51   10.3  20:54 ( 95,-12)  
Dec. 20  20 13.48    5 56.4   1.595   1.145    45   10.7  20:59 ( 89,-12)

* 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. 13  14 32.95   -8 54.5   0.852   0.676    42   10.9   2:53 (279,  2)  
Dec. 20  14 45.22   -8 32.2   0.950   0.770    46   11.9   2:55 (277,  6)

* 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. 13  11 14.31    4 40.1   1.813   2.111    93   11.2   2:53 (236, 33)  
Dec. 20  10 42.57    7 23.8   1.798   2.309   108   11.8   2:55 (219, 40)

* 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. 13   3 27.49   11 11.6   1.209   2.122   150   12.2  21:58 (180, 44)  
Dec. 20   3 22.83   13  1.2   1.249   2.122   143   12.2  21:26 (180, 42)

* 88P/Howell

It will brighten rapidly after this. 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. 13  15 53.71  -19 52.3   2.587   1.699    20   12.8   2:53 (300, -6)  
Dec. 20  16 14.63  -21  0.9   2.524   1.658    22   12.5   2:55 (299, -4)

* 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. 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. 13   0 30.11    9 44.3   1.265   1.847   109   12.7  20:54 (144, 38)  
Dec. 20   0 41.76   10 35.2   1.441   1.952   105   13.3  20:59 (139, 34)

* 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. 13   1 16.92   52 20.3   0.723   1.525   125   12.8  20:54 (170,  2)  
Dec. 20   1  2.34   44 57.9   0.929   1.645   118   13.7  20:59 (160,  6)

* 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. 13  13 52.60  -13 17.3   2.463   1.980    50   13.3   2:53 (277, 13)  
Dec. 20  14  8.48  -14 18.4   2.405   1.978    53   13.3   2:55 (276, 16)

* 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. 13   3 13.64   25 12.5   3.112   4.003   151   13.5  21:45 (180, 30)  
Dec. 20   3 12.36   24 58.2   3.184   4.021   143   13.6  21:16 (180, 30)

* 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. 13  11 31.94   -2 35.4   6.291   6.304    86   14.0   2:53 (245, 35)  
Dec. 20  11 33.25   -2 54.0   6.177   6.305    92   14.0   2:55 (240, 40)

* 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. 13   9 27.01   22 28.0   4.913   5.518   123   14.4   2:53 (198, 30)  
Dec. 20   9 27.03   23  7.9   4.832   5.525   130   14.3   2:55 (191, 31)

* 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. 13  16 35.22   -0 37.1   6.955   6.077    25   14.8   2:53 (292,-27)  
Dec. 20  16 40.78   -0 21.6   6.951   6.107    28   14.8   2:55 (287,-22)

* 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. 13  15 25.89  -42 23.4   2.502   1.728    30   14.9   2:53 (314, 12)  
Dec. 20  15 33.51  -40 39.0   2.440   1.709    33   14.8   2:55 (310, 15)

* C/2024 J3 ( ATLAS )

It will brighten up to 13 mag in 2026. Now it is 14.9 mag (Nov. 17, Alfons Diepvens). Brightening slowly. 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. 13  19  1.34   -6 13.5   5.708   4.877    29   14.9  20:54 ( 73,-13)  
Dec. 20  19  6.19   -5 33.8   5.712   4.842    25   14.8  20:59 ( 69,-19)

* C/2024 T5 ( ATLAS )

Now it is 14.5 mag (Dec. 15, ATLAS Chile). It stays 15 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. 13   2 41.41  -43 40.5   5.441   5.757   103   14.9  21:12 (  0, 81)  
Dec. 20   2 38.88  -42 47.5   5.457   5.716   100   14.8  20:59 ( 23, 82)

* 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. 13   5 12.87  -74 57.5  14.564  14.458    81   14.9  23:41 (  0, 50)  
Dec. 20   5  7.71  -74 57.8  14.551  14.436    81   14.9  23:08 (  0, 50)

* 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. 13  21  6.51  -11 56.2   2.956   2.520    54   15.2  20:54 ( 86, 16)  
Dec. 20  21 17.56  -11 19.2   2.998   2.489    50   15.1  20:59 ( 84, 11)

* 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. 13  19 15.81   -0 29.5   4.487   3.736    36   15.3  20:54 ( 80,-13)  
Dec. 20  19 17.54   -1  4.1   4.531   3.718    30   15.3  20:59 ( 74,-19)

* 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 will be unobservable temporarily in April. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 13  21 29.36   20 58.0   7.111   6.921    74   16.0  20:54 (117,  1)  
Dec. 20  21 30.47   20 57.5   7.166   6.882    69   15.9  20:59 (112, -5)

* 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. It stays extremely 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. 13  22 27.06   35  1.4   5.231   5.373    92   15.9  20:54 (135,  1)  
Dec. 20  22 27.67   33 46.8   5.375   5.415    87   16.0  20:59 (130, -3)

* 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. 13   2 23.97    3 59.4   1.496   2.287   133   16.0  20:54 (180, 51)  
Dec. 20   2 15.58   -0 21.5   1.570   2.257   122   16.1  20:59 (162, 54)

* 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. 13   8 57.82  -11 59.4   6.112   6.606   116   16.1   2:53 (203, 65)  
Dec. 20   8 56.72  -11 49.3   6.030   6.612   122   16.1   2:55 (185, 67)

* 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. 13  14 32.77   -6 24.7   2.435   1.851    43   16.4   2:53 (277,  1)  
Dec. 20  14 50.13   -7 25.3   2.404   1.864    46   16.5   2:55 (276,  4)

* 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. 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. 13  22 35.00   49 45.8   4.387   4.669   100   16.4  20:54 (147, -9)  
Dec. 20  22 40.94   49 12.9   4.504   4.724    96   16.5  20:59 (143,-11)

* 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. 13  21 46.24   -8 18.2   2.222   2.017    65   16.4  20:54 ( 95, 22)  
Dec. 20  22  0.25   -7  4.0   2.284   2.015    61   16.5  20:59 ( 94, 17)

* 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. It stays extremely low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Dec. 13   4 43.84   53 47.4   2.954   3.828   148   16.5  23:15 (180,  1)  
Dec. 20   4 37.78   53 37.8   2.965   3.826   146   16.5  22:41 (180,  1)

* 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. 13   8 43.82   49 55.6   3.459   4.186   132   16.5   2:53 (184,  5)  
Dec. 20   8 36.62   52 14.6   3.432   4.209   137   16.5   2:44 (180,  3)

* 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. 13  23  5.64   -8 42.0   1.796   1.945    83   16.5  20:54 (109, 38)  
Dec. 20  23 16.47   -6 46.7   1.852   1.931    79   16.5  20:59 (106, 32)

* 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. 13  10  8.62   78 10.3   3.397   3.933   116   16.6   2:53 (186,-24)  
Dec. 20   9 27.47   79 13.0   3.329   3.908   119   16.5   2:55 (182,-24)

* 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. 13  11 16.15   20 40.7   2.109   2.461    98   16.6   2:53 (224, 20)  
Dec. 20  11 21.03   21 15.6   2.061   2.501   104   16.6   2:55 (219, 23)

* C/2023 H5 ( Lemmon )

Now it is 16.6 mag (Dec. 13, Alfons Diepvens). It stays 17 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in winter. 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. 13  17 25.63   62 59.0   4.483   4.524    86   16.7  20:54 (149,-50)  
Dec. 20  17 47.76   62 46.9   4.500   4.542    86   16.7   2:55 (211,-51)

* 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. 13  11  2.12   -4 49.4   2.385   2.616    92   16.7   2:53 (241, 42)  
Dec. 20  11  6.99   -5 48.4   2.314   2.633    97   16.7   2:55 (236, 47)

* 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 getting lower gradually after this, and 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. 13  23  2.49   -3 54.1   2.740   2.820    84   16.7  20:54 (112, 34)  
Dec. 20  23  9.19   -2 52.4   2.838   2.824    79   16.8  20:59 (108, 29)

* 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. 13  10 55.30  -24 44.8   5.686   5.698    85   16.8   2:53 (264, 55)  
Dec. 20  10 51.72  -24 50.8   5.589   5.720    92   16.8   2:55 (258, 62)

* 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. 13   9 57.75  -28 52.3   4.278   4.479    95   16.9   2:53 (261, 68)  
Dec. 20   9 58.14  -29 55.5   4.202   4.484   100   16.8   2:55 (256, 74)

* 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. 13  16 15.33   85 34.0   4.686   5.090   108   16.8   2:53 (185,-37)  
Dec. 20  17 19.40   84 60.0   4.691   5.089   108   16.8   2:55 (185,-38)

* 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. 13  22 22.83   24 13.6   2.229   2.394    87   17.0  20:54 (127,  8)  
Dec. 20  22 18.21   22 42.2   2.259   2.295    79   16.9  20:59 (120,  2)

* 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. 13   2 46.90   37 34.9   7.985   8.803   144   17.0  21:18 (180, 17)  
Dec. 20   2 45.11   37 20.2   8.038   8.793   137   17.0  20:59 (178, 18)

* 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. 13   0 21.70   -4 45.8   3.171   3.512   102   17.1  20:54 (130, 49)  
Dec. 20   0 24.70   -4 14.8   3.282   3.523    95   17.2  20:59 (123, 43)

* 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. 13   0  6.45  -52 57.9  11.231  11.074    78   17.2  20:54 ( 43, 60)  
Dec. 20   0  5.41  -52 15.3  11.322  11.087    73   17.2  20:59 ( 47, 55)

* 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. 13  21 43.21  -12  2.7   2.455   2.194    63   17.4  20:54 ( 92, 23)  
Dec. 20  21 53.87  -10 42.5   2.488   2.153    58   17.3  20:59 ( 90, 18)

* 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. 13   3 12.28    3 30.7   2.021   2.872   143   17.3  21:43 (180, 51)  
Dec. 20   3  9.28    4  1.8   2.109   2.902   136   17.5  21:13 (180, 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). Brightening 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. 13   3 35.68   27 10.2   2.044   2.971   156   17.4  22:06 (180, 28)  
Dec. 20   3 29.86   27 13.0   2.060   2.941   147   17.3  21:33 (180, 28)

* 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. 13   9 10.60   -0 56.9   3.345   3.919   119   17.4   2:53 (203, 54)  
Dec. 20   9  4.63    0 24.2   3.260   3.940   127   17.3   2:55 (187, 55)

* (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. 13   8  7.80   20 54.8   1.679   2.523   141   17.5   2:42 (180, 34)  
Dec. 20   8  6.44   21 39.6   1.642   2.536   148   17.4   2:13 (180, 33)

* 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. 13   5 56.92   30 31.0   9.194  10.162   168   17.5   0:32 (180, 24)  
Dec. 20   5 53.41   30 39.1   9.234  10.210   172   17.5   0:01 (180, 24)

* 217P/LINEAR

It 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. 13   9 16.78   13 38.9   1.883   2.561   123   17.6   2:53 (198, 40)  
Dec. 20   9 13.73   14 17.3   1.859   2.616   131   17.7   2:55 (188, 40)

* 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. 13   5  2.80  -47 53.0   8.363   8.731   108   17.6  23:32 (  0, 77)  
Dec. 20   4 56.47  -47 42.4   8.424   8.775   107   17.7  22:59 (  0, 77)

* 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. 13  12 12.47  -11 17.1   5.710   5.516    73   17.7   2:53 (261, 32)  
Dec. 20  12 12.57  -10 50.9   5.599   5.528    80   17.7   2:55 (256, 38)

* 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. 13   7  1.13    5  0.8   3.344   4.223   149   17.7   1:36 (180, 50)  
Dec. 20   6 57.42    4 49.6   3.319   4.234   155   17.7   1:04 (180, 50)

* 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. 13  14  2.97  -15 23.8   2.679   2.132    46   17.7   2:53 (281, 12)  
Dec. 20  14 15.57  -16 31.2   2.653   2.170    50   17.9   2:55 (279, 16)

* C/2025 R1 ( ATLAS )

Now it is 17.4 mag (Nov. 30, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag soon. It locates somewhat low in the Northern Hemisphere. 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. 13  18 57.72   32 23.6   2.286   1.990    60   17.8  20:54 (108,-34)  
Dec. 20  19  1.81   30  3.3   2.376   2.002    56   17.9  20:59 (103,-39)

* 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. 13   6 19.55  -20 33.6   7.879   8.592   133   17.8   0:54 (180, 76)  
Dec. 20   6 15.82  -20 21.8   7.906   8.639   135   17.8   0:23 (180, 75)

* (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. 13   6 31.99   22 36.4   8.314   9.262   163   17.9   1:07 (180, 32)  
Dec. 20   6 27.43   22 21.3   8.301   9.275   171   17.9   0:35 (180, 33)

* C/2023 U1 ( Fuls )

It continues brightening even after the perihelion passage. Now it is 17.6 mag (Dec. 12, ATLAS Chile). It stays 18 mag for a while. In the Northern Hemisphere, it will never be observable after this. 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. 13  23 15.54  -60 34.4   6.204   5.930    69   17.9  20:54 ( 35, 51)  
Dec. 20  23 12.98  -59 18.6   6.304   5.958    65   18.0  20:59 ( 38, 47)

* 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. 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. 13  11 48.22    6  6.4   1.286   1.564    86   22.1   2:53 (241, 26)  
Dec. 20  12  4.25    4 20.8   1.247   1.571    88   22.0   2:55 (240, 30)

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