Weekly Information about Bright Comets (2024 Mar. 16: North)

Japanese version
Home page
Updated on March 18, 2024
Last week South Next week

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.

---------------------------------------------------------------------

* 12P/Pons-Brooks

It returns for the first time in 70 years. It will brighten up to 4.5 mag in spring. Now it is 5.5 mag (Mar. 13, Osamu Miyazaki). It will fade out rapidly after this. In the Northern Hemisphere, it will be unobservable in April. 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)  
Mar. 16   0 54.40   31  3.6   1.632   1.028    36    5.8  19:32 (118, 15)  
Mar. 23   1 28.33   27 55.1   1.619   0.951    32    5.4  19:38 (115, 13)  

* C/2021 S3 ( PanSTARRS )

Now it is 10.1 mag (Mar. 10, Osamu Miyazaki). Fading gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  18 50.84    7 45.0   1.298   1.395    73    9.1   4:45 (299, 46)  
Mar. 23  19  7.94   14  2.3   1.307   1.432    75    9.2   4:34 (292, 50)  

* 144P/Kushida

Now it is 10.1 mag (Mar. 12, Chris Wyatt). It will fade out rapidly after this. It will be fainter than 18 mag in July. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   6 20.60   17 36.7   0.990   1.513    99   10.8  19:32 ( 34, 70)  
Mar. 23   6 42.10   17 27.8   1.056   1.544    97   11.1  19:38 ( 41, 68)  

* 62P/Tsuchinshan 1

It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 10.5 mag (Mar. 12, Chris Wyatt). Fading rapidly. It will be fainter than 18 mag in June. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  12 24.03   10 22.7   0.600   1.585   166   10.9   0:50 (  0, 65)  
Mar. 23  12 17.87   10 12.8   0.643   1.632   168   11.4   0:16 (  0, 65)  

* C/2023 A3 ( Tsuchinshan-ATLAS )

It will approach to Sun down to 0.4 a.u. in late September, and it is expected to brighten up to 0 mag. Now it is 11.9 mag (Mar. 13, Osamu Miyazaki). It will brighten rapidly after this. It stays observable in good condition. 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)  
Mar. 16  14 54.37   -6 28.4   2.617   3.362   131   11.9   3:20 (  0, 48)  
Mar. 23  14 46.15   -5 53.9   2.443   3.274   140   11.6   2:44 (  0, 49)  

* 13P/Olbers

It returned for the first time in 68 years. It will brighten up to 7.5 mag in summer. Now it is 11.1 mag (Mar. 12, Chris Wyatt). It will brighten rapidly after this. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will be unobservable in May. 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)  
Mar. 16   3 19.66    9 32.7   2.320   1.929    54   12.6  19:32 ( 79, 32)  
Mar. 23   3 28.29   12  5.6   2.323   1.857    50   12.2  19:38 ( 85, 29)  

* C/2022 E2 ( ATLAS )

Now it is 12.2 mag (Mar. 13, Osamu Miyazaki). It stays 13 mag for a while. It will be unobservable in May in the Southern Hemisphere, or in June in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   7 13.72   28 18.0   3.551   4.010   110   12.5  19:36 (  0, 83)  
Mar. 23   7  6.78   29  8.8   3.657   3.985   102   12.5  19:38 ( 55, 80)  

* 473P/2023 W1 ( NEAT )

First return of a new periodic comet which brightened up to 10 mag in 2001. Now it is 12.8 mag (Mar. 1, Alan Hale). It will fade out rapidly after this. It will be fainter than 18 mag in June. 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)  
Mar. 16   0 54.47   40  4.9   1.948   1.427    44   12.9  19:32 (126, 20)  
Mar. 23   1 12.19   44 11.8   1.960   1.446    45   13.1  19:38 (132, 19)  

* C/2020 V2 ( ZTF )

It was observed at 9-10 mag for a long time in 2023. Now it is 13.1 mag (Mar. 5, Chris Wyatt). It stays 14 mag for a while. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  23 55.01  -39 41.4   4.770   4.033    38   13.4  19:32 ( 62,-34)  
Mar. 23  23 59.81  -39 57.3   4.789   4.090    41   13.5   4:34 (297,-36)  

* C/2022 L2 ( ATLAS )

Now it is 13.9 mag (Feb. 28, Ken-ichi Kadota). Fading slowly. In the Northern Hemisphere, it will be unobservable in June. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  14  2.43  -36 40.4   1.945   2.693   129   13.6   2:29 (  0, 18)  
Mar. 23  13 34.29  -38  6.6   1.870   2.695   138   13.5   1:34 (  0, 17)  

* 207P/NEAT

Now it is 13.8 mag (Mar. 3, Yukihiro Sugiyama). It will fade out rapidly after this. It will be fainter than 18 mag in May. It stays observable in good condition. Vladimir Bezugly reported it was visible at around 12 mag in the SWAN images in late January.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   7 59.18   -5 36.9   0.249   1.151   123   13.6  20:26 (  0, 50)  
Mar. 23   8 54.62   -1 41.2   0.294   1.211   131   14.2  20:53 (  0, 53)  

* 46P/Wirtanen

The condition is bad in this apparition. It brightens up to 10 mag in early summer, however, it is not observable at all. Brightening rapidly. It will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   0 36.11   -2 58.2   2.298   1.349    13   14.1  19:32 ( 92, -8)  
Mar. 23   0 56.80   -0 20.4   2.255   1.296    11   13.6  19:38 ( 96, -9)  

* 29P/Schwassmann-Wachmann 1

Now it is 12.8 mag (Mar. 9, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in July. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   8  4.75   21 26.4   5.585   6.186   123   13.7  20:27 (  0, 76)  
Mar. 23   8  4.04   21 22.6   5.684   6.188   116   13.7  19:59 (  0, 76)  

* C/2021 G2 ( ATLAS )

Now it is 13.7 mag (Mar. 7, Chris Wyatt). It stays 14 mag for a while. It locates somewhat low in the Northern Hemisphere. But it will become high in winter. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  12  5.66  -37 31.1   4.360   5.165   140   13.8   0:32 (  0, 17)  
Mar. 23  12  3.03  -36 49.7   4.310   5.151   144   13.8   0:01 (  0, 18)  

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 13.8 mag (Mar. 12, Chris Wyatt). Fading slowly. It will be getting lower gradually after this, and it will be unobservable in May. But it will be observable again in July in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   5  7.12    7 42.6   5.328   5.268    81   13.9  19:32 ( 53, 51)  
Mar. 23   5  8.50    8 30.7   5.502   5.328    74   14.1  19:38 ( 63, 46)  

* 32P/Comas Sola

Now it is 14.1 mag (Mar. 12, Chris Wyatt). It stays 15 mag for a while. It will be unobservable in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   4 12.96   27 16.6   2.148   2.050    70   14.0  19:32 ( 91, 52)  
Mar. 23   4 27.95   28  0.9   2.206   2.041    67   14.1  19:38 ( 94, 49)  

* C/2019 U5 ( PanSTARRS )

Now it is 14.3 mag (Mar. 7, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it will be unobservable in May. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   7 48.21  -42  9.5   4.318   4.769   111   14.2  20:10 (  0, 13)  
Mar. 23   7 40.53  -41  1.7   4.410   4.808   107   14.3  19:38 (  1, 14)  

* C/2023 V4 ( Camarasa-Duszanowicz )

It is expected to brighten up to 12 mag in early summer. Now it is 14.5 mag (Mar. 2, Masayoshi Yoshimi). Brightening gradually. It stays extremely low in the Northern Hemisphere. But it will become high in summer. In the Southern Hemisphere, 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)  
Mar. 16   2 27.84    2 46.0   2.237   1.627    41   14.5  19:32 ( 81, 18)  
Mar. 23   2 35.37    6 37.3   2.232   1.554    36   14.2  19:38 ( 88, 15)  

* 479P/2023 WM26 ( Elenin )

First return of a new periodic comet which was discovered in 2011, half a year after the perihelion passage. Now it is 14.5 mag (Mar. 10, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. In the Northern Hemisphere, it will be getting lower gradually. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   7 40.79   -1 22.4   0.631   1.415   119   14.5  20:03 (  0, 53)  
Mar. 23   7 42.46   -3 19.7   0.629   1.373   113   14.4  19:38 (  0, 51)  

* C/2021 T4 ( Lemmon )

It brightened up to 7.8 mag in late July (July 20, Thomas Lehmann). Now it is 16.2 mag (Mar. 2, Toshihiko Ikemura, Hirohisa Sato). Fading gradually. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  13 58.06   13 34.7   2.407   3.270   144   14.6   2:24 (  0, 68)  
Mar. 23  13 42.53   15 43.1   2.429   3.339   151   14.7   1:41 (  0, 71)  

* 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 (Feb. 29, ATLAS South Africa). It stays 15 mag for a while. In the Northern Hemisphere, it will be unobservable in May. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  10 55.13  -54  0.4   6.921   7.514   123   14.6  23:17 (  0,  1)  
Mar. 23  10 50.94  -53 47.3   6.946   7.559   124   14.6  22:45 (  0,  1)  

* 227P/Catalina-LINEAR

Now it is 14.7 mag (Mar. 9, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It will be fainter than 18 mag in June. In the Northern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   7 56.00   33 49.0   0.900   1.625   118   14.9  20:20 (  0, 89)  
Mar. 23   8  7.83   32 19.7   0.945   1.630   114   15.0  20:04 (  0, 87)  

* C/2023 C2 ( ATLAS )

It is expected to brighten up to 12.5 mag in summer. Now it is 16.0 mag (Mar. 11, ATLAS Chile). Brightening slowly. 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)  
Mar. 16  16 29.04  -71 57.9   3.330   3.542    93   15.1   4:45 (359,-17)  
Mar. 23  16 39.09  -73  0.9   3.219   3.490    97   15.0   4:34 (  0,-18)  

* 154P/Brewington

Brightening rapidly. Now it is not observable. It will appear in April in the Southern Hemisphere, or in May in the Northern Hemisphere. It brightens up to 11.5 mag in early summer. But it locates very low around the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  23  4.68   -6 53.2   2.810   1.844    10   15.5   4:45 (269,-13)  
Mar. 23  23 20.70   -4 28.9   2.760   1.804    13   15.0   4:34 (267,-11)  

* C/2024 C4 ( ATLAS )

Now it is 15.9 mag (Mar. 10, Jean-Claude Merlin). It will fade out rapidly after this. It will be fainter than 18 mag in June. 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)  
Mar. 16  17  4.37  -29 40.2   1.139   1.609    97   15.3   4:45 (349, 24)  
Mar. 23  16 59.66  -23 22.2   1.063   1.649   106   15.3   4:34 (354, 31)  

* C/2020 K1 ( PanSTARRS )

It brightened up to 12.1 mag in 2023 spring (May 20, Jose Guilherme de S. Aguiar). Now it is 15.1 mag (Mar. 12, Chris Wyatt). 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)  
Mar. 16   4 22.60  -57 20.9   4.367   4.267    77   15.4  19:32 ( 21, -9)  
Mar. 23   4 29.93  -55  5.7   4.426   4.311    76   15.5  19:38 ( 26, -9)  

* 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 15.7 mag (Mar. 3, Ken-ichi Kadota). It will fade out rapidly after this. It will be fainter than 18 mag in May. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   8  4.61   -0 11.3   1.430   2.162   125   15.5  20:27 (  0, 55)  
Mar. 23   8  8.79    0 53.4   1.551   2.222   119   15.9  20:04 (  0, 56)  

* 125P/Spacewatch

Now it is 16.9 mag (Feb. 29, ATLAS South Africa). Fading gradually. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  18 58.80  -12 41.2   1.523   1.529    71   15.6   4:45 (314, 29)  
Mar. 23  19 18.59  -11 54.2   1.489   1.535    73   15.5   4:34 (313, 30)  

* 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 15.3 mag (Mar. 2, Toshihiko Ikemura, Hirohisa Sato). It stays 16 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)  
Mar. 16  17 44.79   24 26.4   6.571   6.654    90   15.6   4:45 (294, 69)  
Mar. 23  17 46.35   25 22.1   6.538   6.694    94   15.6   4:34 (298, 72)  

* 65P/Gunn

Now it is 16.8 mag (Mar. 3, Toshihiko Ikemura, Hirohisa Sato). 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)  
Mar. 16  13  9.73    3 19.7   2.654   3.598   158   15.7   1:36 (  0, 58)  
Mar. 23  13  5.57    3 44.9   2.610   3.583   165   15.6   1:04 (  0, 59)  

* C/2022 QE78 ( ATLAS )

Now it is 15.6 mag (Mar. 10, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag for a while. It will be getting lower gradually after this, and it will be unobservable in May in the Northern Hemisphere, or in June in the Southern Hemisphere. But it will be observable again in June in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   4 35.51   -4 48.1   6.965   6.740    72   15.8  19:32 ( 50, 36)  
Mar. 23   4 38.22   -4  5.8   7.031   6.711    67   15.8  19:38 ( 58, 32)  

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.8 mag (Feb. 8, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now. In the Northern Hemisphere, it is not observable until 2030.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   3  1.60  -62 20.4  16.887  16.587    70   15.8  19:32 ( 26,-19)  
Mar. 23   3  4.36  -62  6.2  16.857  16.563    71   15.8  19:38 ( 28,-22)  

* C/2022 N2 ( PanSTARRS )

It is expected to brighten up to 11.5 mag in 2025 autumn, and it will be observable in good condition. Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will be observable soon. In the Southern Hemisphere, it will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  22  5.29  -11 17.4   6.592   5.716    26   16.0   4:45 (281, -3)  
Mar. 23  22 10.83  -10 43.4   6.499   5.675    31   15.9   4:34 (282, -1)  

* C/2022 S4 ( Lemmon )

Now it is 16.1 mag (Feb. 22, ATLAS Chile). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now. It locates somewhat low in the Southern Hemisphere. But it will become high in summer. The brightness evolution is slower than originally expected.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   2  4.63  -31  4.1   3.675   3.044    44   15.9  19:32 ( 57, -7)  
Mar. 23   2 11.03  -31 18.2   3.661   3.015    43   15.9  19:38 ( 60,-12)  

* C/2022 T1 ( Lemmon )

Now it is 17.0 mag (Mar. 8, 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)  
Mar. 16  14 15.63  -28 30.4   2.702   3.454   132   16.2   2:41 (  0, 26)  
Mar. 23  14 15.57  -28  8.7   2.642   3.460   139   16.2   2:14 (  0, 27)  

* C/2023 S3 ( Lemmon )

It must have brightened up to 11 mag in winter. However, it was too low to observe at the high light. Now it is 16.1 mag (Mar. 12, ATLAS Chile). Fading rapidly. It will be fainter than 18 mag in April. In the Northern Hemisphere, it will be getting higher gradually. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  19  0.81  -25 27.9   1.199   1.298    71   16.3   4:45 (322, 18)  
Mar. 23  18 37.76  -22 24.4   1.078   1.387    83   16.9   4:34 (329, 26)  

* 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 17.2 mag (Mar. 11, ATLAS Chile). Fading gradually. It will be fainter than 18 mag in May. 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)  
Mar. 16   8 26.46  -46 23.7   2.729   3.280   115   16.3  20:48 (  0,  9)  
Mar. 23   8 18.78  -43 53.5   2.845   3.368   113   16.5  20:13 (  0, 11)  

* C/2021 Y1 ( ATLAS )

It brightened up to 13 mag in early 2023. It stays 17 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  16 34.58  -47 27.1   3.793   4.089   100   16.5   4:45 (357,  7)  
Mar. 23  16 31.59  -47 12.5   3.745   4.149   107   16.5   4:30 (  0,  8)  

* 130P/McNaught-Hughes

It will brighten up to 15 mag from summer to autumn. Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear in April. In the Southern Hemisphere, it will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  21 34.64  -18  1.4   2.557   1.841    35   16.6   4:45 (291, -1)  
Mar. 23  21 52.96  -16 42.4   2.514   1.834    37   16.5   4:34 (290, -1)  

* C/2024 A2 ( ATLAS )

Now it is 16.9 mag (Feb. 26, Jean-Claude Merlin). Fading slowly. It will be fainter than 18 mag in July. In the Northern Hemisphere, it is not observable now, but it will be observable soon. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   5 38.70  -59 22.9   1.721   1.956    87   16.6  19:32 ( 12, -6)  
Mar. 23   5 33.73  -51 35.8   1.742   1.934    85   16.6  19:38 ( 20, -1)  

* C/2023 F3 ( ATLAS )

Now it is 17.1 mag (Mar. 11, ATLAS Chile). It stays 17 mag for a while. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  16 42.43  -48 58.5   5.496   5.731    98   16.8   4:45 (356,  6)  
Mar. 23  16 36.32  -49 44.4   5.360   5.709   105   16.7   4:34 (  0,  5)  

* 150P/LONEOS

Now it is 15.7 mag (Mar. 10, Toshihiko Ikemura, Hirohisa Sato). Fading gradually. It will be fainter than 18 mag in May. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   8 38.39  -16 37.3   0.926   1.746   130   16.7  21:01 (  0, 38)  
Mar. 23   8 41.59  -16 24.9   0.960   1.749   126   16.8  20:37 (  0, 39)  

* C/2023 R2 ( PanSTARRS )

Now it is 17.3 mag (Feb. 28, Ken-ichi Kadota). It will brighten rapidly after this. It will be unobservable in April in the Northern Hemisphere, or in May in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   2 49.04   -3 30.5   3.082   2.500    46   16.9  19:32 ( 72, 18)  
Mar. 23   2 57.72   -2 41.3   3.056   2.414    42   16.8  19:38 ( 77, 14)  

* 30P/Reinmuth 1

Now it is 16.7 mag (Mar. 2, Toshihiko Ikemura, Hirohisa Sato). Brightening slowly. It will be unobservable in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   2 47.28   10 30.9   2.816   2.262    47   16.9  19:32 ( 85, 26)  
Mar. 23   2 59.40   11 42.2   2.843   2.229    43   16.8  19:38 ( 89, 23)  

* C/2019 E3 ( ATLAS )

Very far object. Now it is 17.1 mag (Feb. 28, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   2 17.61  -66 20.7  10.632  10.334    69   16.8  19:32 ( 25,-25)  
Mar. 23   2 20.18  -65 44.0  10.622  10.336    70   16.8  19:38 ( 28,-28)  

* C/2022 U3 ( Bok )

Now it is 17.2 mag (Mar. 2, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. It will be unobservable in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   4 50.01   27  0.5   5.034   4.940    78   16.9  19:32 ( 85, 59)  
Mar. 23   4 54.72   26 34.1   5.128   4.928    72   16.9  19:38 ( 89, 53)  

* 226P/Pigott-LINEAR-Kowalski

Now it is 16.5 mag (Mar. 8, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It will be fainter than 18 mag in April. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will never be observable after this. Thomas Lehmann reported it was bright as 14.8 mag on Mar. 2.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   2 35.22   26 46.4   2.400   1.922    50   16.9  19:32 (102, 32)  
Mar. 23   2 48.78   29 10.1   2.480   1.947    47   17.2  19:38 (107, 29)  

* C/2022 R6 ( PanSTARRS )

Now it is 16.9 mag (Feb. 25, 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)  
Mar. 16   4 53.10  -32 16.2   7.584   7.448    78   17.0  19:32 ( 29, 16)  
Mar. 23   4 55.97  -31 24.8   7.622   7.427    74   17.0  19:38 ( 36, 13)  

* 299P/Catalina-PanSTARRS

Now it is 16.6 mag (Mar. 9, Toshihiko Ikemura, Hirohisa Sato). 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)  
Mar. 16  15 59.89  -29 35.3   2.663   3.165   111   17.1   4:25 (  0, 25)  
Mar. 23  16  2.17  -29 46.3   2.573   3.162   117   17.1   4:00 (  0, 25)  

* C/2021 S4 ( Tsuchinshan )

Now it is 17.0 mag (Mar. 2, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It will be unobservable in April in the Southern Hemisphere, or in June in the Northern Hemisphere. But it will be observable again in July in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   4 44.88   39 19.4   6.810   6.706    79   17.2  19:32 (109, 61)  
Mar. 23   4 48.93   39 11.8   6.917   6.710    73   17.2  19:38 (110, 55)  

* C/2023 T3 ( Fuls )

Now it is 16.6 mag (Mar. 9, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in June. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   7 42.60   -8  1.2   3.956   4.524   119   17.2  20:05 (  0, 47)  
Mar. 23   7 42.77   -7 37.7   3.999   4.487   113   17.2  19:38 (  0, 47)  

* C/2023 H5 ( Lemmon )

Now it is 16.9 mag (Mar. 2, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  10 32.05    9 27.1   4.797   5.745   160   17.3  22:54 (  0, 64)  
Mar. 23  10 27.62   10 39.8   4.809   5.710   152   17.3  22:22 (  0, 66)  

* C/2023 K1 ( ATLAS )

It brightened very rapidly up to 14.9 mag in early summer (July 13, Taras Prystavski). Now it is 18.8 mag (Feb. 7, Toshihiko Ikemura, Hirohisa Sato). Fading gradually. It will be fainter than 18 mag in April. 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)  
Mar. 16  13 55.15   32 59.2   2.201   2.999   136   17.4   2:21 (  0, 88)  
Mar. 23  13 37.11   36 21.8   2.245   3.055   137   17.6   1:36 (180, 89)  

* C/2024 A1 ( ATLAS )

Now it is 18.3 mag (Mar. 12, Jean-Claude Merlin). 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. It stays 15 mag for a long time from late 2024 to early 2026.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16   6  1.58  -51 55.2   5.341   5.456    91   17.5  19:32 ( 10,  2)  
Mar. 23   6  2.15  -50  2.9   5.331   5.417    89   17.5  19:38 ( 16,  2)  

* 478P/2023 Y3 ( ATLAS )

Now it is 17.4 mag (Mar. 6, A. Diepvens). Fading slowly. It will be fainter than 18 mag in May. 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)  
Mar. 16   6 55.90   22 28.7   1.922   2.413   107   17.5  19:32 ( 13, 77)  
Mar. 23   7  1.94   22 54.6   1.999   2.408   101   17.5  19:38 ( 39, 75)  

* 362P/(457175) 2008 GO98

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)  
Mar. 16  15 32.95  -10 32.8   2.297   2.944   121   17.7   3:58 (  0, 44)  
Mar. 23  15 34.47   -9 49.3   2.212   2.936   128   17.6   3:32 (  0, 45)  

* C/2020 F2 ( ATLAS )

Now it is 17.4 mag (Mar. 6, ATLAS-MLO, Mauna Loa). 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)  
Mar. 16  11 56.50   20  1.5   8.544   9.492   161   17.6   0:23 (  0, 75)  
Mar. 23  11 51.99   20 29.4   8.575   9.507   158   17.6  23:46 (  0, 75)  

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 17.9 mag (Mar. 8, Jean-Claude Merlin). It stays 18 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)  
Mar. 16   4 22.28  -64 53.6   4.048   3.995    79   17.6  19:32 ( 17,-15)  
Mar. 23   4 18.44  -63 34.9   4.088   4.019    78   17.7  19:38 ( 21,-17)  

* 37P/Forbes

It will brighten up to 14 mag from summer to autumn. Now it is 20.7 mag (Feb. 15, Pan-STARRS 1, Haleakala). It will brighten rapidly after this. It stays observable in good condition. Around the high light, it is observable in good condition in the Southern Hemisphere. But it locates extremely low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Mar. 16  13 18.08  -21 23.3   1.585   2.481   147   18.1   1:44 (  0, 33)  
Mar. 23  13 13.42  -21 39.9   1.505   2.441   154   17.8   1:12 (  0, 33)  

* 89P/Russell 2

It will brighten up to 16 mag in summer. Brightening slowly. It stays extremely 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)  
Mar. 16  20 49.40  -27  2.5   2.749   2.223    48   17.9   4:45 (305,  1)  
Mar. 23  21  5.23  -26 22.4   2.690   2.222    52   17.8   4:34 (304,  2)  

---------------------------------------------------------------------

Copyright(C) Seiichi Yoshida (comet@aerith.net). All rights reserved.