Weekly Information about Bright Comets (2024 Apr. 20: South)

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Updated on April 22, 2024
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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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* 12P/Pons-Brooks

It returns for the first time in 70 years. It brightened about 1 mag in outburst on Apr. 3. Now it is 4.3 mag (Apr. 20, Marco Goiato). It will fade out rapidly after this. In the Northern Hemisphere, it is not observable now. It locates somewhat low in the Southern Hemisphere. But it will become high in winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   3 24.11   10 37.8   1.606   0.781    22    4.6  18:54 (104,  1)  
Apr. 27   3 48.40    5 40.2   1.600   0.789    23    4.6  18:46 (100,  5)  

* 13P/Olbers

It returned for the first time in 68 years. It will brighten up to 7.5 mag in summer. Now it is 9.8 mag (Apr. 17, Osamu Miyazaki). Brightening rapidly. It stays extremely low in the Northern Hemisphere. In the Southern Hemisphere, it will be unobservable soon. 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)  
Apr. 20   4 14.63   22 26.7   2.281   1.579    35   10.7  18:54 (121,  3)  
Apr. 27   4 29.56   25  3.0   2.259   1.514    32   10.2  18:46 (122,  1)  

* 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 10.7 mag (Apr. 18, Chris Wyatt). It will brighten rapidly after this. 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. 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)  
Apr. 20  13 51.97   -2 28.8   1.916   2.912   170   10.6   0:01 (180, 58)  
Apr. 27  13 33.72   -1 26.1   1.839   2.819   163   10.3  23:09 (180, 56)  

* C/2021 S3 ( PanSTARRS )

It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 10.9 mag (Apr. 17, Osamu Miyazaki). It will fade out rapidly after this. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in May.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  20  3.64   36 11.5   1.454   1.631    80   10.4   5:03 (194, 17)  
Apr. 27  20 13.88   40 39.1   1.509   1.691    81   10.7   5:08 (189, 14)  

* 479P/2023 WM26 ( Elenin )

First return of a new periodic comet which was discovered in 2011, half a year after the perihelion passage. It brightened very rapidly. Now it is 11.3 mag (Apr. 10, Chris Wyatt). It will turn to fade out rapidly after the peak. 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)  
Apr. 20   8 19.14  -11 26.5   0.623   1.261    98   11.0  18:54 (163, 66)  
Apr. 27   8 35.65  -13 38.3   0.621   1.249    97   10.9  18:46 (159, 68)  

* 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. It brightens up to 10 mag, but it will turn to fade out rapidly after that. It will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   2 30.01   10 53.2   2.105   1.126     9   11.7  18:54 ( 97,-10)  
Apr. 27   2 56.34   13 40.4   2.078   1.096     9   11.2  18:46 (100,-10)  

* C/2022 E2 ( ATLAS )

Now it is 12.5 mag (Apr. 2, Osamu Miyazaki). It stays 13 mag for a while. It will be unobservable in June. 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)  
Apr. 20   6 51.10   31 44.0   4.102   3.895    71   12.6  18:54 (154, 18)  
Apr. 27   6 49.80   32 15.3   4.207   3.875    64   12.7  18:46 (150, 15)  

* 144P/Kushida

It brightened up to 8.9 mag from January to March (Feb. 13, Chris Wyatt). Now it is 11.5 mag (Apr. 11, Chris Wyatt). Fading rapidly. It will be fainter than 18 mag in July. 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)  
Apr. 20   8  2.75   15 29.9   1.376   1.696    89   12.7  18:54 (166, 38)  
Apr. 27   8 21.30   14 43.2   1.468   1.739    87   13.2  18:46 (165, 39)  

* 154P/Brewington

It has not been observed yet in this apparition. Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear in May. It stays extremely low in the Southern 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)  
Apr. 20   0 27.89    5 55.3   2.564   1.670    21   13.2   5:03 (261,  2)  
Apr. 27   0 45.68    8 39.1   2.519   1.643    23   12.8   5:08 (257,  4)  

* C/2023 V4 ( Camarasa-Duszanowicz )

Now it is 13.0 mag (Mar. 27, Ken-ichi Kadota). Fading slowly. 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 August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   3 14.53   22 32.5   2.164   1.295    22   13.1  18:54 (113, -8)  
Apr. 27   3 27.18   26 42.1   2.134   1.244    20   12.9  18:46 (115,-12)  

* C/2022 L2 ( ATLAS )

Now it is 13.7 mag (Apr. 7, Chris Wyatt). 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)  
Apr. 20  11 26.94  -36 36.7   1.885   2.723   138   13.6  21:29 (  0, 88)  
Apr. 27  11  1.67  -34 44.3   1.965   2.735   131   13.7  20:37 (180, 90)  

* 62P/Tsuchinshan 1

It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 12.2 mag (Apr. 9, Osamu Miyazaki). 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)  
Apr. 20  12  3.92    8  1.8   0.907   1.832   146   13.7  22:08 (180, 47)  
Apr. 27  12  4.05    7 11.2   0.994   1.883   140   14.2  21:41 (180, 48)  

* C/2021 G2 ( ATLAS )

Now it is 13.7 mag (Apr. 7, Chris Wyatt). It stays 14 mag for a while. In the Northern Hemisphere, it will be unobservable in August. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  11 54.09  -32 54.5   4.241   5.101   145   13.7  21:58 (180, 88)  
Apr. 27  11 52.83  -31 44.3   4.257   5.090   142   13.7  21:30 (180, 87)  

* 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 stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   0 18.36  -42  3.1   4.771   4.319    57   13.7   5:03 (303, 29)  
Apr. 27   0 22.58  -42 52.5   4.747   4.376    62   13.8   5:08 (302, 34)  

* 29P/Schwassmann-Wachmann 1

Now it is 14.1 mag (Apr. 10, Chris Wyatt). It will be getting lower gradually after this, and it will be unobservable in June in the Northern Hemisphere, or in July in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   8  6.77   20 52.5   6.125   6.195    89   13.9  18:54 (168, 33)  
Apr. 27   8  8.75   20 41.4   6.239   6.197    82   13.9  18:46 (163, 33)  

* 473P/2023 W1 ( NEAT )

First return of a new periodic comet which brightened up to 10 mag in 2001. It brightened up to 12.5 mag from February to March (Feb. 29, Thomas Lehmann). Now it is 14.4 mag (Apr. 1, Hiroshi Abe). 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)  
Apr. 20   3  0.26   59 12.4   2.026   1.570    49   14.2  18:54 (145,-28)  
Apr. 27   3 41.21   61 59.5   2.054   1.612    50   14.6  18:46 (149,-27)  

* 32P/Comas Sola

Now it is 14.3 mag (Apr. 1, Hiroshi Abe). Fading slowly. It will be unobservable in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   5 34.65   30  0.9   2.432   2.025    54   14.2  18:54 (139, 11)  
Apr. 27   5 52.58   30 13.0   2.487   2.025    51   14.3  18:46 (139, 10)  

* C/2023 C2 ( ATLAS )

It is expected to brighten up to 12.5 mag in summer. Now it is 15.3 mag (Apr. 20, 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)  
Apr. 20  16 59.58  -76 36.9   2.799   3.287   110   14.4   3:09 (  0, 48)  
Apr. 27  16 57.05  -77 16.2   2.703   3.238   113   14.3   2:39 (  0, 48)  

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 14.1 mag (Apr. 10, Chris Wyatt). It stays 15 mag for a while. It will be unobservable in May in the Northern Hemisphere, or in June in the Southern Hemisphere. But it will be observable again in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   5 18.36   11 15.9   6.152   5.567    50   14.4  18:54 (123, 22)  
Apr. 27   5 21.65   11 50.8   6.298   5.627    44   14.5  18:46 (120, 19)  

* C/2019 U5 ( PanSTARRS )

Now it is 14.9 mag (Apr. 19, ATLAS South Africa). 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)  
Apr. 20   7 23.29  -36 37.3   4.841   4.964    91   14.7  18:54 ( 78, 73)  
Apr. 27   7 21.72  -35 40.7   4.956   5.004    86   14.8  18:46 ( 80, 68)  

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 15.9 mag (Apr. 17, ATLAS South Africa). 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)  
Apr. 20  10 38.65  -52  5.4   7.134   7.740   123   14.8  20:43 (  0, 73)  
Apr. 27  10 37.05  -51 32.0   7.203   7.785   122   14.9  20:14 (  0, 73)  

* 130P/McNaught-Hughes

Now it is 15.4 mag (Apr. 9, E. Cortes, N. Paul). It stays 15 mag for a while. 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)  
Apr. 20  23  3.05  -10 50.6   2.345   1.824    47   15.3   5:03 (263, 29)  
Apr. 27  23 19.72   -9 18.1   2.303   1.826    49   15.3   5:08 (258, 31)  

* 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 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)  
Apr. 20  22 31.60   -8 29.4   6.049   5.513    53   15.5   5:03 (255, 34)  
Apr. 27  22 36.30   -7 57.3   5.919   5.473    59   15.4   5:08 (249, 39)  

* 227P/Catalina-LINEAR

It brightened up to 14.5 mag from February to March (Mar. 11, W. Pei). Now it is 14.9 mag (Apr. 11, W. Pei). It will fade out rapidly after this. 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)  
Apr. 20   9  3.76   25 23.0   1.167   1.676   100   15.6  19:10 (180, 30)  
Apr. 27   9 18.74   23 27.7   1.232   1.694    97   15.8  18:57 (180, 32)  

* 125P/Spacewatch

Now it is 15.7 mag (Apr. 13, Ken-ichi Kadota). Fading gradually. 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)  
Apr. 20  20 28.60   -8  8.8   1.362   1.587    82   15.6   5:03 (224, 56)  
Apr. 27  20 43.43   -7 11.2   1.331   1.607    85   15.7   5:08 (216, 57)  

* C/2024 C4 ( ATLAS )

Now it is 15.6 mag (Apr. 1, Ken-ichi Kadota). 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)  
Apr. 20  16 14.95    8 48.7   0.963   1.844   139   15.6   2:23 (180, 47)  
Apr. 27  15 59.14   16 21.5   1.011   1.901   140   15.8   1:40 (180, 39)  

* 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)  
Apr. 20   2 42.88  -33 12.1   3.514   2.912    46   15.7  18:54 ( 61, 17)  
Apr. 27   2 52.45  -33 58.7   3.458   2.890    48   15.6  18:46 ( 59, 16)  

* C/2023 R2 ( PanSTARRS )

Now it is 16.9 mag (Mar. 23, Ken-ichi Kadota). It will brighten rapidly after this. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be unobservable in June. It brightens up to 11 mag in August. But it is not observable around the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   3 41.10    0 35.5   2.880   2.063    29   15.9  18:54 ( 98, 10)  
Apr. 27   3 54.25    1 23.0   2.819   1.974    26   15.7  18:46 ( 98,  9)  

* 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 15.9 mag (Mar. 30, ATLAS-MLO, Mauna Loa). 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)  
Apr. 20  17 47.28   28 58.2   6.440   6.854   110   15.8   3:54 (180, 26)  
Apr. 27  17 46.21   29 46.6   6.429   6.894   113   15.8   3:26 (180, 25)  

* C/2022 QE78 ( ATLAS )

Now it is 15.9 mag (Mar. 26, ATLAS Chile). It stays 16 mag for a while. 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, or in August in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   4 52.56   -1 29.5   7.248   6.600    46   15.8  18:54 (108, 26)  
Apr. 27   4 56.88   -0 54.7   7.287   6.573    41   15.8  18:46 (106, 22)  

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.3 mag (Mar. 4, 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)  
Apr. 20   3 17.75  -61 27.6  16.698  16.465    74   15.8  18:54 ( 35, 33)  
Apr. 27   3 21.53  -61 23.3  16.651  16.441    76   15.8  18:46 ( 34, 32)  

* C/2020 K1 ( PanSTARRS )

It brightened up to 12.1 mag in 2023 spring (May 20, 2023, Jose Guilherme de S. Aguiar). Now it is 15.1 mag (Apr. 10, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   5  0.36  -47  9.7   4.695   4.489    72   15.8  18:54 ( 56, 46)  
Apr. 27   5  8.04  -45 29.3   4.768   4.535    70   15.9  18:46 ( 58, 44)  

* C/2022 T1 ( Lemmon )

Now it is 16.9 mag (Apr. 19, ATLAS South Africa). Fading slowly. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  14  9.31  -25 24.1   2.511   3.493   165   16.1   0:17 (180, 81)  
Apr. 27  14  7.07  -24 27.5   2.511   3.504   169   16.1  23:43 (180, 79)  

* C/2023 F3 ( ATLAS )

Now it is 16.3 mag (Apr. 17, G. Duszanowicz). It stays 16 mag for a while. In the Northern Hemisphere, 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)  
Apr. 20  15 57.35  -52 10.3   4.902   5.626   132   16.5   2:06 (  0, 73)  
Apr. 27  15 44.22  -52 28.0   4.820   5.606   137   16.4   1:26 (  0, 72)  

* 37P/Forbes

It will brighten up to 14 mag from summer to autumn. Now it is 16.9 mag (Apr. 19, ATLAS South Africa). Brightening gradually. 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 extremely low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  12 46.53  -21  4.2   1.303   2.278   161   16.7  22:50 (180, 76)  
Apr. 27  12 39.76  -20 32.9   1.283   2.238   155   16.5  22:16 (180, 76)  

* C/2021 Y1 ( ATLAS )

It brightened up to 13 mag in early 2023. Fading slowly. 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)  
Apr. 20  16  8.51  -45 17.4   3.615   4.388   135   16.5   2:17 (  0, 80)  
Apr. 27  16  0.79  -44 30.1   3.607   4.447   142   16.5   1:42 (  0, 80)  

* 65P/Gunn

Now it is 16.5 mag (Apr. 13, Ken-ichi Kadota). 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)  
Apr. 20  12 46.67    5  3.5   2.575   3.520   156   16.5  22:50 (180, 50)  
Apr. 27  12 42.44    5 11.8   2.600   3.505   149   16.5  22:19 (180, 50)  

* 207P/NEAT

It approached to Earth down to 0.2 a.u. and it brightened up to 13.1 mag in March (Mar. 13, W. Pei). Vladimir Bezugly reported it was visible at around 12 mag in the SWAN images in late January. Now it is 17.0 mag (Apr. 16, ATLAS South Africa). Fading rapidly. 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)  
Apr. 20  10 51.55    4 35.9   0.604   1.480   132   16.6  20:57 (180, 51)  
Apr. 27  11  8.14    4 46.6   0.704   1.551   129   17.1  20:46 (180, 50)  

* 299P/Catalina-PanSTARRS

Now it is 16.8 mag (Apr. 19, ATLAS South Africa). 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)  
Apr. 20  16  0.15  -29 45.3   2.280   3.157   145   16.8   2:08 (180, 85)  
Apr. 27  15 57.06  -29 31.7   2.230   3.156   152   16.7   1:38 (180, 85)  

* C/2024 A2 ( ATLAS )

Now it is 17.0 mag (Apr. 11, ATLAS Chile). Fading slowly. It will be fainter than 18 mag in July. It will be unobservable in May in the Northern Hemisphere, or in June in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   5 39.09  -25 31.0   2.045   1.885    66   16.8  18:54 ( 90, 48)  
Apr. 27   5 42.87  -20 39.3   2.152   1.882    60   16.9  18:46 ( 94, 43)  

* C/2021 X1 ( Maury-Attard )

It brightened up to 14 mag in early 2023 and 2023 autumn. Now it is 16.4 mag (Jan. 15, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag for a while. It will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  22 49.30   14  2.5   5.103   4.443    44   16.8   5:03 (239, 16)  
Apr. 27  22 49.09   14 54.2   5.058   4.486    50   16.8   5:08 (233, 21)  

* C/2019 E3 ( ATLAS )

Very far object. Now it is 17.1 mag (Apr. 2, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   2 32.78  -63 52.9  10.548  10.347    75   16.8  18:54 ( 30, 29)  
Apr. 27   2 36.22  -63 34.9  10.522  10.350    77   16.8  18:46 ( 30, 27)  

* C/2022 R6 ( PanSTARRS )

Now it is 16.6 mag (Apr. 17, ATLAS Chile). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   5 11.13  -28 17.0   7.753   7.343    62   16.9  18:54 ( 83, 44)  
Apr. 27   5 15.68  -27 36.3   7.779   7.323    59   16.9  18:46 ( 82, 40)  

* 103P/Hartley 2

It approached to Earth down to 0.38 a.u., and brightened up to 8.0 mag in last autumn (Sept. 29, Virgilio Gonano). Now it is 16.9 mag (Apr. 12, A. Nagy Melykuti). Fading gradually. It will be fainter than 18 mag in May. 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)  
Apr. 20   8 33.59    3 34.9   2.083   2.457    99   17.0  18:54 (174, 51)  
Apr. 27   8 41.17    3 53.8   2.224   2.514    94   17.2  18:46 (169, 51)  

* 362P/(457175) 2008 GO98

Now it is 18.0 mag (Mar. 13, Jean-Claude Merlin). 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)  
Apr. 20  15 30.05   -6 12.2   1.964   2.907   155   17.2   1:38 (180, 61)  
Apr. 27  15 26.72   -5 13.9   1.931   2.901   161   17.1   1:07 (180, 60)  

* C/2023 H5 ( Lemmon )

Now it is 17.0 mag (Apr. 1, Ken-ichi Kadota). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  10 13.80   14 55.3   5.002   5.571   119   17.2  20:18 (180, 40)  
Apr. 27  10 11.69   15 47.6   5.076   5.536   112   17.2  19:49 (180, 39)  

* C/2023 T3 ( Fuls )

Now it is 17.1 mag (Apr. 20, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in June in the Northern Hemisphere, or in August in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   7 50.83   -6 12.2   4.209   4.344    90   17.2  18:54 (152, 58)  
Apr. 27   7 54.59   -5 56.1   4.266   4.309    85   17.2  18:46 (145, 56)  

* 89P/Russell 2

It will brighten up to 16 mag in summer. Now it is 17.1 mag (Apr. 18, 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)  
Apr. 20  22  4.10  -23 22.5   2.445   2.229    65   17.4   5:03 (267, 48)  
Apr. 27  22 17.54  -22 36.5   2.382   2.234    69   17.2   5:08 (263, 51)  

* 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). Fading gradually. It will be fainter than 18 mag in May. 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)  
Apr. 20   1 40.55  -49 20.1   3.144   2.797    60   17.3   5:03 (317, 19)  
Apr. 27   1 51.97  -50 32.0   3.165   2.880    64   17.4   5:08 (316, 23)  

* C/2024 A1 ( ATLAS )

Now it is 17.5 mag (Apr. 17, ATLAS South Africa). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after July. 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)  
Apr. 20   6 12.32  -42 44.3   5.337   5.263    80   17.3  18:54 ( 64, 59)  
Apr. 27   6 16.36  -41  2.1   5.347   5.225    77   17.3  18:46 ( 67, 56)  

* C/2023 P1 ( Nishimura )

It approached to Sun down to 0.23 a.u. and brightened up to 2.5 mag in mid September in 2023 (Sept. 18, 2023, Juan Jose Gonzalez). Now it is 17.1 mag (Apr. 19, ATLAS South Africa). 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)  
Apr. 20   8  8.39  -35  9.0   3.406   3.713    99   17.4  18:54 ( 86, 82)  
Apr. 27   8  9.22  -33 25.1   3.562   3.797    95   17.6  18:46 ( 93, 77)  

* C/2021 S4 ( Tsuchinshan )

Now it is 17.2 mag (Mar. 30, ATLAS-HKO, Haleakala). It stays 18 mag for a while. In the Northern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in June. But it will be observable again in July. It stays extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   5  9.14   38 51.6   7.306   6.726    51   17.4  18:54 (141,  0)  
Apr. 27   5 15.00   38 48.5   7.389   6.731    46   17.4  18:46 (138, -1)  

* C/2021 T4 ( Lemmon )

It brightened up to 7.8 mag in late July in 2023 (July 20, 2023, Thomas Lehmann). Now it is 16.8 mag (Apr. 4, Catalina Sky Survey). 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)  
Apr. 20  12 41.72   21 37.1   2.765   3.616   142   17.4  22:45 (180, 33)  
Apr. 27  12 29.19   22 19.5   2.903   3.685   135   17.6  22:05 (180, 33)  

* 150P/LONEOS

Now it is 16.7 mag (Mar. 27, Ken-ichi Kadota). Fading slowly. It will be fainter than 18 mag in May. 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)  
Apr. 20   9 12.47  -15  6.1   1.143   1.784   112   17.4  19:18 (180, 70)  
Apr. 27   9 23.76  -14 50.6   1.199   1.799   109   17.5  19:02 (180, 70)  

* C/2022 U1 ( Leonard )

Now it is 17.8 mag (Apr. 10, D. Buczynski). It stays 17 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it is not observable now, but it will be observable soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  22 51.10   40 22.9   4.796   4.207    49   17.6   5:03 (221, -3)  
Apr. 27  22 50.44   41 11.0   4.746   4.211    52   17.6   5:08 (215,  1)  

* C/2020 F2 ( ATLAS )

Now it is 17.9 mag (Apr. 1, Ken-ichi Kadota). It stays 18 mag for a while. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20  11 35.09   21 50.7   8.858   9.568   132   17.8  21:39 (180, 33)  
Apr. 27  11 31.46   22  2.8   8.962   9.583   125   17.8  21:08 (180, 33)  

* 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 will be getting lower gradually. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Apr. 20   7 36.45   23 43.9   2.320   2.395    81   17.8  18:54 (161, 29)  
Apr. 27   7 47.09   23 42.1   2.401   2.394    77   17.9  18:46 (159, 28)  

* 349P/Lemmon

Now it is 17.9 mag (Apr. 11, ATLAS Chile). Fading slowly. 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)  
Apr. 20  14 25.46  -23  5.4   1.533   2.520   165   18.0   0:34 (180, 78)  
Apr. 27  14 20.23  -22 53.3   1.518   2.516   170   17.9   0:01 (180, 78)  

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 17.4 mag (Apr. 6, ATLAS Chile). It stays 18 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)  
Apr. 20   4 18.68  -59 33.7   4.229   4.119    76   17.9  18:54 ( 38, 41)  
Apr. 27   4 21.22  -58 55.6   4.256   4.146    76   18.0  18:46 ( 39, 38)  

* 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 16.6 mag (Apr. 13, Ken-ichi Kadota). It will fade out rapidly after this. 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)  
Apr. 20  15 58.40    1  2.8   0.825   1.751   146   18.0   2:08 (180, 54)  
Apr. 27  15 11.34    7 42.1   0.881   1.842   154   18.4   0:54 (180, 48)  

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