Weekly Information about Bright Comets (2024 May 18: North)

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Updated on May 21, 2024
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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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* 12P/Pons-Brooks

It returns for the first time in 70 years. It brightened up to 3.7 mag in early April (Apr. 6, Jose Guilherme Aguiar). Now it is 5.8 mag (May 15, 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)  
May  18   4 57.95   -9 10.6   1.563   0.929    34    5.5  20:38 ( 94,-23)  
May  25   5 22.02  -13 58.8   1.552   1.002    39    6.0  20:46 ( 91,-28)  

* 13P/Olbers

It returned for the first time in 68 years. Now it is 8.7 mag (May 14, Yoshimi Nagai). Fading gradually. It stays extremely low in the Northern Hemisphere. 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)  
May  18   5 24.93   32 41.8   2.165   1.343    26    7.6  20:38 (125,  8)  
May  25   5 47.70   35  4.6   2.127   1.296    26    7.3  20:46 (128,  8)  

* 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 10.0 mag (May 13, Marco Goiato). It will brighten rapidly after this. It will be getting lower gradually after this, and it will be unobservable in July in the Northern Hemisphere, or in August in the Southern Hemisphere. 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)  
May  18  12 36.21    1 24.6   1.755   2.530   130    9.8  20:49 (  0, 56)  
May  25  12 18.59    2  5.4   1.768   2.431   119    9.6  20:46 ( 19, 56)  

* 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 will fade out rapidly after this. It will never be observable after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   4 23.01   21  2.0   2.035   1.055    10   10.3  20:38 (125,-10)  
May  25   4 54.10   22 54.8   2.035   1.058    10   10.2  20:46 (127, -9)  

* 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 12.0 mag (May 1, Thomas Lehmann). It will fade out rapidly after this. It will be fainter than 18 mag in September. 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)  
May  18   9 42.73  -20 26.3   0.626   1.256    97   11.0  20:38 ( 41, 23)  
May  25  10 10.73  -22 35.6   0.634   1.272    98   11.1  20:46 ( 41, 20)  

* C/2021 S3 ( PanSTARRS )

It brightened up to 9.6 mag from February to March (Feb. 25, Thomas Lehmann). Now it is 11.6 mag (May 14, 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 soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18  20 33.74   51 24.4   1.690   1.886    84   11.4   3:14 (219, 66)  
May  25  20 36.25   54 10.7   1.752   1.955    85   11.6   3:08 (209, 67)  

* 154P/Brewington

It has not been observed yet in this apparition. It will turn to fade out rapidly after the peak. It stays extremely low. But it will become high in summer 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)  
May  18   1 42.26   16 50.7   2.402   1.582    28   11.9   3:14 (250,  1)  
May  25   2  2.32   19 29.3   2.370   1.569    29   11.7   3:08 (248,  3)  

* C/2023 V4 ( Camarasa-Duszanowicz )

Now it is 12.1 mag (Apr. 27, Hiroshi Abe). It will turn to fade out rapidly after the peak. It locates somewhat low in the Northern Hemisphere. 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)  
May  18   4 17.05   39 38.8   2.017   1.140    21   12.3  20:38 (139,  2)  
May  25   4 39.88   44  1.2   1.972   1.125    24   12.1  20:46 (144,  4)  

* C/2022 E2 ( ATLAS )

Now it is 12.0 mag (May 4, Seiichi Yoshida). It stays 12 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)  
May  18   6 50.58   33 42.0   4.473   3.818    44   12.7  20:38 (116, 23)  
May  25   6 52.10   34  9.9   4.542   3.802    38   12.7  20:46 (120, 18)  

* C/2023 C2 ( ATLAS )

It is expected to brighten up to 12.5 mag in summer. Now it is 14.8 mag (May 7, Chris Wyatt). Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear in August. 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)  
May  18  16 26.39  -78  2.6   2.446   3.094   121   13.8   0:47 (  0,-23)  
May  25  16 11.06  -77 43.4   2.372   3.047   123   13.7   0:04 (  0,-23)  

* C/2021 G2 ( ATLAS )

Now it is 13.5 mag (May 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)  
May  18  11 52.49  -28  9.3   4.376   5.059   127   13.7  20:38 (  8, 26)  
May  25  11 53.61  -27  0.7   4.437   5.050   122   13.8  20:46 ( 16, 26)  

* C/2020 V2 ( ZTF )

It was observed at 9-10 mag for a long time in 2023. Now it is 13.3 mag (May 5, Thomas Lehmann). Fading slowly. 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)  
May  18   0 33.32  -46  8.0   4.648   4.547    78   13.9   3:14 (312,-21)  
May  25   0 36.01  -47 29.4   4.611   4.604    83   14.0   3:08 (315,-19)  

* 29P/Schwassmann-Wachmann 1

Now it is 13.2 mag (Apr. 27, Hiroshi Abe). It will be unobservable in July. But it will be observable again in September in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   8 17.28   20  0.5   6.566   6.202    64   14.0  20:38 ( 92, 34)  
May  25   8 20.86   19 44.4   6.666   6.204    58   14.1  20:46 ( 96, 28)  

* C/2022 L2 ( ATLAS )

Now it is 13.9 mag (May 2, Thomas Lehmann). 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)  
May  18  10 12.17  -28 54.3   2.325   2.782   106   14.1  20:38 ( 30, 19)  
May  25  10  2.70  -27 18.4   2.468   2.801    98   14.2  20:46 ( 40, 15)  

* 32P/Comas Sola

Now it is 14.0 mag (Apr. 27, Thomas Lehmann). Fading slowly. It will be unobservable in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   6 47.77   29 59.1   2.648   2.040    43   14.4  20:38 (112, 21)  
May  25   7  6.31   29 37.5   2.701   2.048    41   14.5  20:46 (114, 18)  

* C/2023 R2 ( PanSTARRS )

It will brighten rapidly after this. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be unobservable soon. 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)  
May  18   4 40.26    3 35.1   2.603   1.705    21   14.9  20:38 (108,-18)  
May  25   4 58.06    4 14.0   2.523   1.616    20   14.6  20:46 (112,-21)  

* 144P/Kushida

It brightened up to 8.9 mag from January to March (Feb. 13, Chris Wyatt). Now it is 13.7 mag (May 7, 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)  
May  18   9 13.01   11 54.4   1.769   1.877    79   14.7  20:38 ( 74, 41)  
May  25   9 29.01   10 50.8   1.877   1.925    77   15.2  20:46 ( 76, 37)  

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 14.5 mag (Apr. 27, Hiroshi Abe). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it will be unobservable in June. But it will be observable again in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   5 32.71   13 21.4   6.680   5.804    27   14.8  20:38 (108, -2)  
May  25   5 36.66   13 47.3   6.786   5.862    22   14.8  20:46 (113, -8)  

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 16.2 mag (May 6, ATLAS Chile). It stays 16 mag for a while. In the Northern Hemisphere, it will be unobservable soon. In the Southern Hemisphere, it stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18  10 36.02  -49 47.5   7.458   7.920   113   15.0  20:38 ( 17,  2)  
May  25  10 36.89  -49 13.9   7.556   7.965   110   15.1  20:46 ( 22,  0)  

* C/2019 U5 ( PanSTARRS )

Now it is 14.7 mag (May 12, ATLAS South Africa). 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 July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   7 21.60  -33 27.1   5.296   5.125    74   15.1  20:38 ( 55, -8)  
May  25   7 22.72  -32 55.6   5.404   5.166    71   15.2  20:46 ( 59,-14)  

* 130P/McNaught-Hughes

Now it is 15.4 mag (Apr. 9, E. Cortes, N. Paul). It stays 15 mag for a while. 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)  
May  18   0  7.45   -4 44.1   2.179   1.845    57   15.2   3:14 (281,  8)  
May  25   0 22.54   -3 16.6   2.137   1.855    60   15.2   3:08 (281, 10)  

* 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. In the Southern Hemisphere, it will be getting higher gradually. The brightness evolution is slower than originally expected.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   3 25.58  -37 14.1   3.258   2.834    56   15.4   3:14 (289,-48)  
May  25   3 38.32  -38 39.9   3.186   2.819    59   15.3   3:08 (292,-46)  

* C/2022 QE78 ( ATLAS )

Now it is 15.9 mag (Mar. 26, ATLAS Chile). It stays 15 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it will be unobservable in June. But it will be observable again in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   5 11.13    0 37.6   7.356   6.492    29   15.7  20:38 (101,-14)  
May  25   5 16.21    1  3.9   7.362   6.466    25   15.7  20:46 (106,-20)  

* 192P/Shoemaker-Levy 1

It has not been observed yet in this apparition. It is expected to brighten up to 15 mag in summer. It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in June. It stays extremely low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   1 52.17   -1 58.3   2.191   1.467    34   16.0   3:14 (264,-12)  
May  25   2 11.91    0 51.5   2.179   1.465    34   15.7   3:08 (262,-10)  

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 13 mag in 2031. Now it is 15.0 mag (May 3, Thomas Lehmann). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting higher gradually. In the Northern Hemisphere, it is not observable until 2030.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   3 33.48  -61 24.5  16.497  16.368    80   15.7   3:14 (326,-49)  
May  25   3 37.56  -61 29.8  16.442  16.344    82   15.7   3:08 (325,-47)  

* 37P/Forbes

It will brighten up to 14 mag from summer to autumn. Now it is 16.0 mag (May 5, Yukihiro Sugiyama). Brightening slowly. In the Northern Hemisphere, it will be getting lower 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)  
May  18  12 26.28  -18 44.0   1.285   2.120   134   15.9  20:40 (  0, 36)  
May  25  12 24.99  -18 13.0   1.302   2.082   127   15.7  20:46 ( 10, 36)  

* 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 14.1 mag (May 1, Thomas Lehmann). Fading rapidly. 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)  
May  18   6 14.83   65 10.6   2.180   1.754    52   15.8  20:38 (151, 31)  
May  25   7  6.00   64 15.4   2.237   1.806    52   16.3  20:46 (149, 32)  

* 62P/Tsuchinshan 1

It brightened up to 7.4 mag from December to January (Dec. 24, Osamu Miyazaki). Now it is 13.8 mag (May 3, Hirohisa Sato). Fading rapidly. It will be fainter than 18 mag in June. 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)  
May  18  12 11.95    4 16.7   1.298   2.040   123   15.9  20:38 (  6, 59)  
May  25  12 16.61    3 13.6   1.411   2.093   118   16.4  20:46 ( 19, 57)  

* C/2022 N2 ( PanSTARRS )

It is expected to brighten up to 13 mag in 2025 autumn, and it will be observable in good condition. Now it is 16.4 mag (May 9, ATLAS Chile). 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)  
May  18  22 48.77   -6 28.0   5.506   5.354    76   16.0   3:14 (295, 22)  
May  25  22 52.28   -6  1.2   5.362   5.314    81   15.9   3:08 (298, 25)  

* 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 (May 3, Katsumi Yoshimoto). 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)  
May  18  17 40.37   31 46.6   6.438   7.014   121   15.9   1:57 (  0, 87)  
May  25  17 37.75   32 15.9   6.457   7.055   122   16.0   1:27 (  0, 87)  

* 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 16.0 mag (May 11, ATLAS South Africa). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in September. It locates somewhat low in the Southern Hemisphere. But it will become high in summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   5 30.73  -41 16.1   4.991   4.672    66   16.1  20:38 ( 59,-31)  
May  25   5 38.10  -40  8.0   5.063   4.718    64   16.2  20:46 ( 62,-36)  

* 125P/Spacewatch

Now it is 15.8 mag (May 3, Ken-ichi Kadota). 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)  
May  18  21 20.34   -4 41.0   1.238   1.681    96   16.2   3:14 (312, 38)  
May  25  21 29.87   -4  3.8   1.208   1.709   100   16.4   3:08 (315, 40)  

* C/2023 F3 ( ATLAS )

Now it is 16.4 mag (Apr. 28, Jean-Claude Merlin). 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)  
May  18  15  0.79  -52  9.3   4.677   5.549   146   16.3  23:14 (  0,  3)  
May  25  14 46.39  -51 38.0   4.667   5.531   145   16.3  22:32 (  0,  3)  

* 146P/Shoemaker-LINEAR

It will brighten up to 14.5 mag in summer. Now it is 17.9 mag (May 6, Hidetaka Sato). Brightening slowly. In the Northern Hemisphere, it is not observable now, but it will appear 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)  
May  18   0 10.12  -22  7.2   1.816   1.682    66   16.9   3:14 (295, -3)  
May  25   0 31.36  -20 17.8   1.746   1.642    67   16.5   3:08 (293, -2)  

* 227P/Catalina-LINEAR

It brightened up to 14.5 mag from February to March (Mar. 11, W. Pei). Now it is 16.0 mag (May 13, A. Diepvens). It will fade out rapidly after this. It will be fainter than 18 mag in June. 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)  
May  18  10  3.78   17 28.3   1.449   1.762    89   16.6  20:38 ( 69, 54)  
May  25  10 18.58   15 26.3   1.528   1.788    86   16.9  20:46 ( 71, 49)  

* 65P/Gunn

Now it is 16.0 mag (May 4, Yukihiro Sugiyama). It stays 17 mag for a while. 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)  
May  18  12 33.72    4 59.4   2.742   3.459   128   16.6  20:48 (  0, 60)  
May  25  12 32.46    4 42.8   2.807   3.444   121   16.6  20:46 ( 13, 59)  

* 299P/Catalina-PanSTARRS

Now it is 16.1 mag (May 12, ATLAS Chile). Fading slowly. 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)  
May  18  15 44.02  -28 17.0   2.154   3.158   171   16.7   0:02 (  0, 27)  
May  25  15 39.29  -27 42.7   2.155   3.159   170   16.7  23:25 (  0, 27)  

* 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 stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   2 46.37  -63  6.2  10.429  10.360    83   16.7   3:14 (327,-43)  
May  25   2 49.53  -63  5.0  10.395  10.364    85   16.7   3:08 (326,-41)  

* C/2021 X1 ( Maury-Attard )

It brightened up to 14 mag in early 2023 and 2023 autumn. Now it is 18.3 mag (May 7, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It stays observable in good condition. It is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18  22 45.10   17 29.6   4.874   4.615    69   16.9   3:14 (274, 37)  
May  25  22 42.42   18 20.0   4.802   4.658    75   16.9   3:08 (276, 42)  

* C/2022 R6 ( PanSTARRS )

Now it is 16.5 mag (May 12, ATLAS South Africa). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in August. It locates somewhat low in the Southern Hemisphere. But it will become high in summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   5 30.63  -25 52.8   7.829   7.263    52   16.9  20:38 ( 75,-25)  
May  25   5 35.94  -25 25.1   7.837   7.243    51   16.9  20:46 ( 79,-31)  

* 89P/Russell 2

It will brighten up to 16 mag in summer. Now it is 16.9 mag (May 12, ATLAS Chile). It stays 17 mag for a while. 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)  
May  18  22 54.11  -20 29.2   2.188   2.255    80   17.0   3:14 (305, 11)  
May  25  23  4.95  -19 52.6   2.124   2.264    84   16.9   3:08 (306, 13)  

* 362P/(457175) 2008 GO98

Now it is 17.6 mag (Mar. 20, ATLAS South Africa). 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)  
May  18  15 14.36   -2 38.9   1.907   2.886   162   16.9  23:28 (  0, 52)  
May  25  15 10.34   -2  0.2   1.925   2.882   156   16.9  22:56 (  0, 53)  

* C/2022 T1 ( Lemmon )

Now it is 16.7 mag (May 7, ATLAS Chile). Fading slowly. It will be fainter than 18 mag 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)  
May  18  14  1.68  -21 24.9   2.592   3.545   156   16.9  22:16 (  0, 34)  
May  25  14  0.85  -20 26.0   2.645   3.561   150   17.0  21:47 (  0, 35)  

* C/2023 H5 ( Lemmon )

Now it is 16.9 mag (May 6, ATLAS-HKO, Haleakala). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in August. But it will be observable again in September in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18  10  9.01   17 55.1   5.329   5.436    90   17.2  20:38 ( 69, 56)  
May  25  10  9.33   18 28.4   5.417   5.403    83   17.2  20:46 ( 77, 49)  

* C/2023 T3 ( Fuls )

Now it is 16.7 mag (May 9, ATLAS Chile). It stays 17 mag for a while. It will be unobservable in June in the Northern Hemisphere, or in August in the Southern Hemisphere. But it will be observable again in September in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   8  9.44   -5 27.7   4.431   4.209    70   17.2  20:38 ( 70, 18)  
May  25   8 15.44   -5 25.8   4.481   4.176    66   17.2  20:46 ( 74, 12)  

* C/2024 A1 ( ATLAS )

Now it is 17.1 mag (May 13, ATLAS South Africa). It stays 17 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in September. 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)  
May  18   6 30.89  -36 23.7   5.387   5.112    69   17.2  20:38 ( 58,-19)  
May  25   6 36.32  -35  1.8   5.400   5.075    66   17.2  20:46 ( 63,-23)  

* C/2024 C4 ( ATLAS )

Now it is 16.9 mag (May 9, Catalina Sky Survey). 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. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18  15 12.94   31 16.8   1.295   2.083   128   17.2  23:25 (  0, 86)  
May  25  15  0.52   33 50.9   1.421   2.147   122   17.6  22:46 (  0, 89)  

* C/2022 U1 ( Leonard )

Now it is 17.5 mag (May 4, Toshihiko Ikemura, Hirohisa Sato). 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)  
May  18  22 43.52   43 52.3   4.548   4.226    65   17.5   3:14 (240, 46)  
May  25  22 39.13   44 48.8   4.470   4.232    69   17.5   3:08 (240, 51)  

* C/2024 G3 ( ATLAS )

It approaches to Sun down to 0.09 a.u. on Jan. 13, 2025. According to the calculation, it will brighten up to -1 mag. But probably, it will be disintegrated. At the high light, it may be observable after the perihelion passage only in the Southern Hemisphere. Now it is 17.9 mag (May 10, ATLAS Chile). Brightening gradually. 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)  
May  18  16  0.80  -80 23.3   3.576   4.163   119   18.0   0:23 (  0,-25)  
May  25  15 14.05  -80 10.2   3.472   4.080   120   17.8  22:59 (  0,-25)  

* 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 soon. 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)  
May  18   2 28.25  -54 56.5   3.212   3.126    76   17.9   3:14 (316,-40)  
May  25   2 41.15  -56 40.3   3.229   3.207    79   18.0   3:08 (318,-39)  

* 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 18.7 mag (May 5, Mt. Lemmon Survey). Fading gradually. It locates somewhat low in the Northern Hemisphere. In the Southern Hemisphere, it will be getting lower gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  18   9  5.71    4  9.3   2.654   2.681    80   17.9  20:38 ( 67, 35)  
May  25   9 14.29    4  2.7   2.797   2.736    76   18.1  20:46 ( 72, 30)  

* 150P/LONEOS

Now it is 17.8 mag (May 4, ATLAS Chile). Fading slowly. 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)  
May  18  10  2.96  -14 32.7   1.390   1.858   100   17.9  20:38 ( 40, 30)  
May  25  10 17.24  -14 37.6   1.461   1.881    97   18.1  20:46 ( 45, 27)  

* 349P/Lemmon

Now it is 17.9 mag (May 3, John Maikner). Fading slowly. 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)  
May  18  14  5.63  -21 50.3   1.545   2.511   157   17.9  22:19 (  0, 33)  
May  25  14  2.27  -21 26.9   1.577   2.510   150   18.0  21:49 (  0, 33)  

* C/2020 F2 ( ATLAS )

Now it is 17.7 mag (May 4, Yasukazu Ikari). It stays 18 mag for a while. 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)  
May  18  11 22.65   22 20.4   9.327   9.631   104   17.9  20:38 ( 50, 71)  
May  25  11 20.47   22 20.7   9.459   9.647    97   18.0  20:46 ( 66, 65)  

* P/2003 T12 ( SOHO )

It was observed at three apparitions in 2003, 2012 and 2016. It has not been observed yet in this apparition. It will brighten up to 15.5 mag in July. It brightens up to 15.5 mag, but it will turn to fade out rapidly after that. 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)  
May  18  23 53.74    7 17.5   1.162   1.030    56   21.1   3:14 (273, 17)  
May  25   0 35.29   10 25.4   1.121   0.940    51   20.1   3:08 (268, 15)  

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