Weekly Information about Bright Comets (2023 May 20: North)

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Updated on May 22, 2023
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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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* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 10.2 mag (Apr. 23, Jose Guilherme de S. Aguiar). Fading slowly. In the Northern Hemisphere, it is not observable now, but it will appear in August. It stays extremely 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  20   5  9.31  -19 26.8   3.218   2.594    44    9.6  20:40 ( 85,-27)  
May  27   5 18.82  -17 39.7   3.317   2.653    42    9.8  20:47 ( 90,-31)  

* C/2020 V2 ( ZTF )

Now it is 10.6 mag (Apr. 9, Ken-ichi Kadota). It stays 10 mag for a while. Now it is not observable. It will appear in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   2 47.61   23  5.1   3.202   2.232    13   10.0   3:13 (236, -6)  
May  27   2 52.21   21 54.5   3.173   2.238    18   10.0   3:07 (239, -4)  

* C/2023 E1 ( ATLAS )

It has large but very diffuse coma. It seems to brighten up to 9-10 mag in July. Now it is 11.4 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). It will turn to fade out rapidly after brightening. In the Northern Hemisphere, it stays observable in good condition. 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  20  12 10.70   64  3.2   0.768   1.233    86   11.3  20:40 (176, 61)  
May  27  12 14.66   66 58.5   0.764   1.176    81   10.9  20:47 (171, 57)  

* C/2021 T4 ( Lemmon )

It is expected to brighten up to 8 mag in July. Now it is 10.5 mag (May 19, Giuseppe Pappa). It will brighten rapidly after this. In the Northern Hemisphere, it is not observable now, but it will be observable soon. In the Southern Hemisphere, it stays observable in good condition. At the high light, it will be observable in excellent condition in the Southern Hemisphere, but it will be very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   0 43.64  -12  9.8   2.173   1.793    54   11.7   3:13 (282, -3)  
May  27   0 43.81  -13  3.4   1.976   1.741    61   11.4   3:07 (286,  0)  

* C/2019 U5 ( PanSTARRS )

Now it is 11.7 mag (May 11, Osamu Miyazaki). Fading slowly. 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. 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  20  10 35.27   -4  2.5   3.286   3.654   103   11.8  20:40 ( 41, 42)  
May  27  10 30.21   -4 30.6   3.421   3.662    95   11.9  20:47 ( 51, 36)  

* C/2022 A2 ( PanSTARRS )

Now it is 11.8 mag (May 17, Osamu Miyazaki). Fading gradually. In the Northern Hemisphere, it will be getting higher gradually. 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  20   0 48.19   37 47.7   2.726   2.090    42   11.9   3:13 (239, 23)  
May  27   0 52.60   37 10.7   2.716   2.139    45   12.1   3:07 (241, 26)  

* 364P/PanSTARRS

It approached to Earth down to 0.12 a.u. in April, and brightened up to 11.5 mag (Apr. 8, Osamu Miyazaki). Now it is 12.5 mag (May 8, Giuseppe Pappa). It will fade out rapidly after this. It will be fainter than 18 mag in July. 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  20   0 46.53   -8 51.9   0.522   0.807    52   12.2   3:13 (279, -2)  
May  27   1  3.71   -8  3.5   0.602   0.829    54   12.6   3:07 (279, -1)  

* C/2020 K1 ( PanSTARRS )

Now it is 12.2 mag (Apr. 30, Marco Goiato). Fading slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it stays observable in good condition. It was expected to brighten up to 10 mag from spring to summer. However, it is fainter than originally expected.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  20 59.88  -66  6.8   2.541   3.075   112   12.3   3:13 (348,-13)  
May  27  21  5.14  -69 58.3   2.502   3.078   115   12.3   3:07 (351,-16)  

* 237P/LINEAR

It brightened very rapidly as expected. Now it is 12.1 mag (May 16, Osamu Miyazaki). Fading gradually. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  19 54.35  -10 41.5   1.284   1.988   119   12.5   3:13 (342, 43)  
May  27  19 58.13   -9  0.2   1.231   1.990   124   12.4   3:07 (347, 45)  

* C/2022 E3 ( ZTF )

It approached to Earth down to 0.29 a.u. in early February, and it brightened up to 4.5 mag (Feb. 1, Juan Jose Gonzalez). Now it is 11.6 mag (Apr. 23, Jose Guilherme de S. Aguiar). Fading gradually. 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  20   5 30.21  -13 55.2   2.846   2.209    42   12.7  20:40 ( 87,-20)  
May  27   5 36.11  -14 53.5   2.949   2.290    41   12.9  20:47 ( 90,-27)  

* 81P/Wild 2

Now it is 12.6 mag (May 17, Osamu Miyazaki). It will fade out rapidly after this. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  17 41.17  -18 14.2   1.217   2.165   152   12.8   1:54 (  0, 37)  
May  27  17 34.98  -18 13.6   1.224   2.205   160   12.9   1:20 (  0, 37)  

* C/2019 L3 ( ATLAS )

It brightened up to 8.3 mag in 2021-2022 winter (Jan. 6, 2022, Toshiyuki Takahashi). Now it is 12.2 mag (May 14, Hiroshi Abe). 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  20   9  9.62  -30 37.6   5.444   5.586    92   13.0  20:40 ( 42,  9)  
May  27   9 12.87  -30 22.0   5.564   5.630    88   13.1  20:47 ( 47,  5)  

* 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 13.0 mag (May 17, Osamu Miyazaki). Fading slowly. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  15 25.67   20 20.9   4.284   5.097   139   13.3  23:34 (  0, 75)  
May  27  15 22.61   20 55.2   4.349   5.128   136   13.4  23:03 (  0, 76)  

* C/2021 S3 ( PanSTARRS )

It is expected to brighten up to 7 mag in early 2024. Now it is 14.2 mag (May 17, ATLAS Chile). Brightening gradually. 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  20   6  3.31  -24 45.0   4.200   3.728    55   13.8  20:40 ( 73,-19)  
May  27   6 11.66  -24 18.4   4.161   3.657    53   13.7  20:47 ( 76,-24)  

* 71P/Clark

Now it is 13.5 mag (May 11, Ken-ichi Kadota). Fading 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  20   0  5.21   -8 25.7   2.198   1.923    60   14.0   3:13 (285,  7)  
May  27   0 17.73   -7 20.2   2.170   1.957    64   14.1   3:07 (285,  9)  

* C/2021 Y1 ( ATLAS )

The brightness evolution is slower than originally predicted. Now it is 14.8 mag (May 7, ATLAS South Africa). Fading slowly. 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  20   5 22.45  -27 52.1   2.484   2.046    53   14.0  20:40 ( 74,-29)  
May  27   5 38.85  -29 22.1   2.471   2.057    54   14.0  20:47 ( 75,-33)  

* 29P/Schwassmann-Wachmann 1

Now it is 14.6 mag (May 9, Ken-ichi Kadota). It stays 14 mag for a while. It will be unobservable in June. But it will be observable again in August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   6 49.15   26 32.2   6.805   6.100    42   14.1  20:40 (110, 19)  
May  27   6 54.27   26 20.2   6.879   6.102    37   14.1  20:47 (113, 13)  

* 185P/Petriew

It is expected to brighten up to 11 mag in July. Now it is 19.0 mag (May 8, iTelescope Deep Sky Chile, Rio Hurtado). Brightening rapidly. It stays extremely low in the Northern Hemisphere. But it will become high in autumn. It locates somewhat low in the Southern Hemisphere. Recently it is much fainter than this ephemeris.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   0 27.36   12 54.4   1.633   1.211    47   14.7   3:13 (264, 14)  
May  27   0 57.64   15 15.7   1.583   1.152    46   14.1   3:07 (261, 14)  

* 77P/Longmore

Now it is 14.2 mag (May 9, Yukihiro Sugiyama). Fading gradually. 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  20  13 31.88  -31 50.8   1.450   2.369   147   14.2  21:41 (  0, 23)  
May  27  13 26.90  -32  7.1   1.497   2.376   141   14.3  21:08 (  0, 23)  

* P/2018 HT3 ( NEOWISE )

Rob Matson discovered it as a bright new comet as 11 mag from SWAN images between Apr. 5 and 15. It was revealed to be an asteroid which has been observed also in 2012 and 2018. It approached to Sun down to 0.5 a.u. on Mar. 29. Now it is 13.6 mag (Apr. 20, Michael Jager). It will fade out rapidly after this. It will be fainter than 18 mag in July. 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  20   3 10.62  -74 56.8   0.388   1.114    94   14.4   3:13 (342,-42)  
May  27   0 32.08  -89 10.1   0.400   1.213   110   14.9   3:07 (358,-35)  

* 126P/IRAS

It will brighten rapidly up to 13.5 mag in summer. Now it is 15 mag (May 19, Giuseppe Pappa). It stays 14 mag for a while. 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 September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   0 47.16  -13 13.5   2.164   1.784    54   14.6   3:13 (283, -5)  
May  27   0 58.53  -10  7.1   2.096   1.764    57   14.5   3:07 (282, -1)  

* C/2021 X1 ( Maury-Attard )

Now it is 14.9 mag (Mar. 19, Masayoshi Yoshimi). It stays 14 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in June. In the Southern Hemisphere, it will be getting higher gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   2 41.34    1 46.0   4.134   3.234    23   14.7   3:13 (253,-19)  
May  27   2 42.30    2 29.8   4.083   3.234    28   14.7   3:07 (256,-15)  

* 199P/Shoemaker 4

Now it is 16.2 mag (May 15, ATLAS Chile). It stays 15 mag for a while. In the Southern Hemisphere, 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  20  18 35.07  -18 50.8   2.119   2.965   139   14.9   2:47 (  0, 36)  
May  27  18 33.21  -19 44.7   2.053   2.956   147   14.8   2:18 (  0, 35)  

* C/2022 W3 ( Leonard )

It will brighten up to 13 mag in summer. Now it is 15.8 mag (May 11, Ken-ichi Kadota). Brightening slowly. In the Northern Hemisphere, it will be getting higher gradually. 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  20   2  0.51   63  9.2   1.975   1.480    46   15.2   3:13 (209, 25)  
May  27   1 55.70   63 19.3   1.916   1.450    48   15.0   3:07 (210, 27)  

* C/2022 L2 ( ATLAS )

Now it is 15.5 mag (May 10, ATLAS Chile). It stays 15 mag for a while. It stays observable in good condition. It is expected to brighten up to 12.5 mag in 2024 spring. At the high light, it will be observable in excellent condition in the Southern Hemisphere, but it will be low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  17 43.35   22 51.8   3.316   4.024   128   15.1   1:56 (  0, 78)  
May  27  17 30.91   23  3.0   3.227   3.975   131   15.0   1:16 (  0, 78)  

* C/2023 B2 ( ATLAS )

Brightened rapidly. It continues brightening even after the perihelion passage. Now it is 14.9 mag (May 16, Toshihiko Ikemura, Hirohisa Sato). 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  20  12 48.56   -9 21.4   1.106   1.965   136   15.1  20:58 (  0, 46)  
May  27  12 56.93   -6  7.0   1.197   2.007   130   15.4  20:47 (  3, 49)  

* C/2022 E2 ( ATLAS )

Now it is 15.3 mag (May 9, Ken-ichi Kadota). It stays 15 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. It is expected to brighten up to 12 mag from 2024 to 2025.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   8 54.62   -2 33.1   5.644   5.543    79   15.3  20:40 ( 65, 27)  
May  27   8 54.73   -1 44.5   5.720   5.501    72   15.2  20:47 ( 72, 21)  

* C/2021 G2 ( ATLAS )

It will brighten up to 14 mag from 2024 to 2025. Now it is 15.2 mag (May 15, ATLAS Chile). It stays 15 mag for a while. 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  20   8 57.22  -30  5.4   6.069   6.155    90   15.3  20:40 ( 44,  8)  
May  27   9  1.24  -29 27.6   6.114   6.125    85   15.3  20:47 ( 50,  4)  

* C/2020 S4 ( PanSTARRS )

Now it is 15.3 mag (May 9, Ken-ichi Kadota). Fading slowly. It will be unobservable in August in the Southern Hemisphere, or in September in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   9 55.81   27 28.7   3.466   3.496    83   15.3  20:40 ( 88, 56)  
May  27  10  2.94   26 53.9   3.573   3.514    78   15.4  20:47 ( 91, 50)  

* 117P/Helin-Roman-Alu 1

Now it is 16.0 mag (May 1, iTelescope Deep Sky Chile, Rio Hurtado). 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  20   0  5.20   -7 42.8   3.776   3.395    60   15.4   3:13 (284,  7)  
May  27   0 12.13   -7  6.9   3.703   3.409    65   15.4   3:07 (286, 10)  

* C/2020 R7 ( ATLAS )

It brightened up to 13.4 mag in last summer (July 7, Giuseppe Pappa). Now it is 15.4 mag (May 2, 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)  
May  20  17  2.95   28 37.0   3.100   3.807   128   15.5   1:16 (  0, 83)  
May  27  16 50.65   30 18.7   3.145   3.849   127   15.6   0:36 (  0, 85)  

* C/2023 A3 ( Tsuchinshan-ATLAS )

It will approach to Sun down to 0.4 a.u. in late September in 2024, and it is expected to brighten up to 0 mag. Now it is 16.0 mag (May 14, G. Masi). It stays 16 mag for a while. 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)  
May  20  14 37.40    2 56.9   5.624   6.534   151   16.4  22:46 (  0, 58)  
May  27  14 32.30    3  8.2   5.610   6.469   145   16.4  22:13 (  0, 58)  

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 16.7 mag (May 3, ATLAS South Africa). It stays 16 mag for a while. In the Northern Hemisphere, it will be unobservable in June. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   8 19.40   -9 51.3   4.043   3.884    73   16.4  20:40 ( 65, 16)  
May  27   8 20.56  -10 21.8   4.121   3.866    68   16.4  20:47 ( 70,  9)  

* 118P/Shoemaker-Levy 4

It brightened up to 12.4 mag in winter (Feb. 10, Taras Prystavski). Now it is 17.5 mag (May 9, Yukihiro Sugiyama). Fading gradually. It will be fainter than 18 mag in July. In the Northern Hemisphere, it will be getting lower gradually.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   9 45.25   18 30.5   2.202   2.324    83   16.5  20:40 ( 76, 50)  
May  27   9 55.90   17 46.5   2.313   2.356    79   16.7  20:47 ( 80, 45)  

* 72P/Denning-Fujikawa

It will brighten up to 16 mag in June. Now it is 18.3 mag (May 10, Hidetaka Sato). It will fade out rapidly after this. It will be fainter than 18 mag in July. In the Northern Hemisphere, it is not observable now, but it will appear in July. In the Southern Hemisphere, it will be unobservable in July. In its last apparition in 2014, it was re-observed after 36-year blank.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   1 10.39    0 36.1   1.348   0.908    42   17.2   3:13 (268, -1)  
May  27   1 46.00    5 24.0   1.358   0.854    38   16.6   3:07 (262, -1)  

* 103P/Hartley 2

It is expected to brighten up to 7.5 mag in October, and it will be observable in excellent condition. Now it is 18.6 mag (May 17, Jean-Claude Merlin). It will brighten rapidly after this. It stays observable in good condition. In the Southern Hemisphere, it becomes low temporarily around the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  21 46.92    2 45.0   1.838   2.075    88   17.1   3:13 (301, 40)  
May  27  21 57.92    4 36.3   1.709   2.014    91   16.7   3:07 (301, 43)  

* C/2019 E3 ( ATLAS )

Very far object. Now it is 17.0 mag (May 11, ATLAS South Africa). 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  20   5  9.48  -67 33.3  10.330  10.357    88   16.8  20:40 ( 28,-40)  
May  27   5 12.96  -67 21.6  10.318  10.354    89   16.8  20:47 ( 28,-43)  

* C/2022 P1 ( NEOWISE )

It brightened up to 9.7 mag in autumn (Oct. 23, Marco Goiato). Now it is 16.8 mag (May 12, ATLAS Chile). 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 stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  14 38.09  -36  3.2   1.679   2.645   158   16.8  22:45 (  0, 19)  
May  27  14 13.69  -32 28.7   1.775   2.708   151   17.2  21:54 (  0, 23)  

* 12P/Pons-Brooks

It returns for the first time in 70 years. It will brighten up to 4.5 mag in 2024 spring. Now it is 16.9 mag (May 9, Jean-Claude Merlin). Brightening gradually. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  19 32.18   46 42.1   4.273   4.495    96   17.0   3:13 (204, 77)  
May  27  19 28.45   48 17.9   4.172   4.427    97   16.8   3:07 (184, 77)  

* C/2022 U4 ( Bok )

Now it is 17.5 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). 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 soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  13  0.24   55 15.8   2.697   2.997    97   16.9  21:09 (180, 70)  
May  27  13  2.04   54 25.8   2.731   2.980    94   16.8  20:47 (179, 71)  

* 119P/Parker-Hartley

It continued brightening even after the perihelion passage, and brightened up to 13.9 mag in winter (Jan. 20, Hidenori Nohara). Now it is 17.3 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. It will be fainter than 18 mag in July. 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  20   8 34.49   23  8.6   3.222   2.972    66   16.9  20:40 ( 93, 38)  
May  27   8 43.79   22 35.8   3.331   2.997    62   17.0  20:47 ( 96, 32)  

* 94P/Russell 4

Now it is 17.2 mag (May 3, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in August. 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  20   9 23.32   21 52.8   2.205   2.227    78   16.9  20:40 ( 85, 47)  
May  27   9 34.71   20 46.0   2.279   2.227    74   17.0  20:47 ( 87, 42)  

* C/2022 JK5 ( PanSTARRS )

The ATLAS search program detected its cometary activity in April. Now it is 16.3 mag (May 18, ATLAS Chile). 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)  
May  20  22 55.87  -24 51.0   2.621   2.696    83   17.0   3:13 (308,  8)  
May  27  23  6.33  -24 33.5   2.552   2.702    87   16.9   3:07 (310, 10)  

* C/2020 F2 ( ATLAS )

Now it is 16.9 mag (May 11, ATLAS Chile). It stays 17 mag for a while. It will be getting lower gradually after this, and it will be unobservable in September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  12 29.38   14  4.0   8.431   8.997   121   17.0  20:40 (  1, 69)  
May  27  12 26.24   14 14.4   8.544   9.005   114   17.0  20:47 ( 25, 67)  

* C/2018 U1 ( Lemmon )

It brightened up to 13.6 mag in 2021 (June 17, 2021, R. Carstens). Now it is 16.9 mag (May 2, ATLAS South Africa). 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)  
May  20  11 28.27  -70  9.5   6.014   6.540   117   17.1  20:40 (  5,-16)  
May  27  11 18.64  -69  3.2   6.071   6.572   115   17.1  20:47 ( 10,-16)  

* 116P/Wild 4

It brightened up to 12.7 mag in last year (Feb. 27, 2022, Jose Guilherme de S. Aguiar). Now it is 17.7 mag (May 2, ATLAS South Africa). Fading slowly. It will be fainter than 18 mag in August. 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  20  20  8.21  -24 48.2   2.328   2.960   119   17.1   3:13 (343, 28)  
May  27  20  7.98  -24 59.1   2.273   2.985   126   17.2   3:07 (348, 29)  

* 80P/Peters-Hartley

Now it is 16.4 mag (May 10, Michael Jager). Fading gradually. It will be fainter than 18 mag in July. In the Northern Hemisphere, it stays observable in good condition. It looks diffuse, but it has a large coma.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  22 10.15   15 23.9   2.236   2.272    79   17.2   3:13 (283, 44)  
May  27  22 15.36   17 37.0   2.206   2.316    83   17.3   3:07 (283, 48)  

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 14 mag in 2031. Now it is 16.7 mag (Apr. 14, Thomas Lehmann). 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. 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  20   3  3.23  -57 24.3  17.838  17.650    77   17.2   3:13 (319,-45)  
May  27   3  6.39  -57 31.9  17.775  17.625    79   17.2   3:07 (319,-42)  

* 180P/NEAT

Now it is 17.3 mag (May 9, Yukihiro Sugiyama). 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  20   9 50.22   31  3.9   2.475   2.524    81   17.3  20:40 ( 94, 57)  
May  27   9 59.38   29 51.3   2.548   2.519    76   17.3  20:47 ( 96, 51)  

* 219P/LINEAR

It has not been observed yet in this apparition. 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  20  18 28.10  -14 10.8   2.047   2.901   140   17.4   2:40 (  0, 41)  
May  27  18 25.61  -13 34.5   1.972   2.878   147   17.3   2:10 (  0, 41)  

* 287P/Christensen

Now it is 18 mag (May 11, Giuseppe Pappa). 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  20  22 37.07   -8 33.1   3.037   3.044    80   17.4   3:13 (300, 23)  
May  27  22 43.92   -8 19.4   2.942   3.041    85   17.3   3:07 (302, 26)  

* P/2014 OL465 ( PanSTARRS )

It showed cometary activity in 2023, and brightened rapidly. Now it is 17.3 mag (May 8, ATLAS South Africa). Fading slowly. It will be fainter than 18 mag in August. 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)  
May  20  14 26.34  -45 50.0   2.486   3.396   149   17.4  22:35 (  0,  9)  
May  27  14 21.93  -45  7.3   2.506   3.400   146   17.4  22:03 (  0, 10)  

* C/2021 E3 ( ZTF )

It brightened up to 9.3 mag in early summer in 2022 (June 5, Chris Wyatt). Now it is 17.4 mag (Apr. 28, ATLAS Chile). Fading slowly. It will be fainter than 18 mag in June. In the Northern Hemisphere, it will be unobservable soon. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20   6 58.27   -2 29.4   4.845   4.303    52   17.5  20:40 ( 84,  4)  
May  27   7  2.19   -1 40.1   4.990   4.366    47   17.6  20:47 ( 89, -2)  

* 96P/Machholz 1

It approached to Sun down to 0.1 a.u. on Jan. 31. It was bright as 7.0-7.5 mag in early February (Feb. 5, Michael Jager). Now it is 17.4 mag (May 11, Giuseppe Pappa). 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)  
May  20  19 31.76  -13  6.4   1.433   2.181   125   17.5   3:13 (350, 41)  
May  27  19 16.63  -14 10.5   1.428   2.268   135   17.7   3:02 (  0, 41)  

* 99P/Kowal 1

It brightened up to 15.9 mag in 2022 spring (May 5, Toshiyuki Takahashi). Now it is 16.8 mag (May 11, ATLAS South Africa). 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)  
May  20  16 14.92  -24 32.6   3.936   4.939   171   17.5   0:28 (  0, 30)  
May  27  16 11.09  -24 26.6   3.935   4.947   176   17.6  23:52 (  0, 31)  

* C/2019 O3 ( Palomar )

Now it is 17.4 mag (May 12, ATLAS-HKO, Haleakala). It stays 18 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)  
May  20  17 26.41   79 33.0  10.081   9.950    79   17.7   1:37 (180, 45)  
May  27  17  7.82   79 57.7  10.119   9.968    78   17.7   0:51 (180, 45)  

* C/2020 H6 ( ATLAS )

Now it is 17.4 mag (May 14, ATLAS-HKO, Haleakala). It stays 18 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)  
May  20  18 49.66   62 13.0   6.477   6.559    90   17.8   3:01 (180, 63)  
May  27  18 46.36   63  2.0   6.507   6.595    90   17.8   2:30 (180, 62)  

* C/2021 C5 ( PanSTARRS )

It was predicted to brighten up to 16 mag in 2023. But actually, it is very faint as 18.6 mag (May 3, iTelescope Deep Sky Chile, Rio Hurtado). 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)  
May  20  21  6.94  -77  9.6   2.870   3.373   111   18.1   3:13 (353,-24)  
May  27  21  2.71  -77 29.9   2.845   3.392   114   18.1   3:07 (354,-23)  

* P/2023 B1 ( PanSTARRS )

It moves along an almost circular orbit. It brightened up to 16.2 mag temporarily in outburst (Jan. 27, Toshihiko Ikemura, Hirohisa Sato). Now it is 18.2 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). Fading slowly. 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  20  10 36.61   24 44.7   6.007   6.141    92   18.2  20:40 ( 75, 63)  
May  27  10 38.10   24 20.1   6.114   6.141    86   18.3  20:47 ( 81, 56)  

* C/2022 Q2 ( ATLAS )

It was observed at 17 mag in 2022 autumn. It was predicted to be observable at 17 mag also in 2023 spring. But actually, it is extremely faint as 19.0 mag (May 16, Toshihiko Ikemura, Hirohisa Sato). It will fade out rapidly after this. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  17 29.28   24 11.6   1.358   2.146   129   19.8   1:43 (  0, 79)  
May  27  16 48.98   25  8.5   1.383   2.201   132   20.0   0:36 (  0, 80)  

* 280P/Larsen

In the last apparition, it had faded before the perihelion passage. It was expected to brighten up to 17 mag if it would become as bright as its last apparition. But actually, it is extremely faint as 22 mag (Apr. 8, Giuseppe Pappa). Fading slowly. It stays observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  20  13 47.59    7 28.3   1.834   2.691   140   21.6  21:56 (  0, 62)  
May  27  13 45.77    7 12.2   1.877   2.683   134   21.7  21:27 (  0, 62)  

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