Weekly Information about Bright Comets (2023 June 10: North)

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 Updated on June 11, 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/2023 E1 ( ATLAS )

It brightened very rapidly. Now it is 11.8 mag (June 7, Osamu Miyazaki). It will fade out rapidly after this. 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)  
June 10  12 38.13   72 21.2   0.737   1.084    74   10.1  20:58 (169, 51)  
June 17  13  1.57   74 55.9   0.714   1.053    72    9.7  21:03 (170, 48)

* C/2020 V2 ( ZTF )

Now it is 10.6 mag (Apr. 9, Ken-ichi Kadota). It stays 10 mag for a while. It will be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   3  0.45   19 25.3   3.075   2.259    30   10.0   3:00 (247,  1)  
June 17   3  3.99   18  3.9   3.007   2.274    36   10.0   2:58 (251,  5)

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 10.7 mag (May 30, Thomas Lehmann). Fading slowly. 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)  
June 10   5 36.49  -14 42.6   3.499   2.773    38   10.0  20:58 (101,-40)  
June 17   5 44.70  -13 30.5   3.580   2.834    36   10.2  21:03 (106,-44)

* C/2021 T4 ( Lemmon )

It is expected to brighten up to 8 mag in July. Now it is 10.6 mag (June 1, Thomas Lehmann). It will turn to fade out rapidly after brightening. It stays extremely low in the Northern Hemisphere. But it will become high in winter. 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)  
June 10   0 40.37  -16  8.4   1.555   1.649    76   10.6   3:00 (296,  8)  
June 17   0 35.29  -18 45.3   1.335   1.609    85   10.2   2:58 (303, 12)

* C/2019 U5 ( PanSTARRS )

Now it is 12.1 mag (May 24, Osamu Miyazaki). It stays 13 mag for a while. 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)  
June 10  10 23.56   -5 34.4   3.693   3.682    81   12.1  20:58 ( 65, 23)  
June 17  10 21.71   -6 10.2   3.826   3.694    74   12.2  21:03 ( 70, 16)

* 237P/LINEAR

It brightened very rapidly as expected. Now it is 12.5 mag (May 31, 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)  
June 10  20  0.98   -5 43.1   1.144   1.998   135   12.3   2:50 (  0, 49)  
June 17  20  0.07   -4 11.8   1.111   2.005   141   12.3   2:22 (  0, 51)

* C/2020 K1 ( PanSTARRS )

Now it is 12.2 mag (May 30, Taras Prystavski). 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)  
June 10  21 10.20  -77 45.2   2.472   3.089   118   12.3   3:00 (356,-23)  
June 17  21  5.74  -81 30.4   2.481   3.097   118   12.4   2:58 (359,-26)

* C/2022 A2 ( PanSTARRS )

It brightened up to 9.5 mag from winter to early spring (Jan. 30, Katsumi Yoshimoto). Now it is 11.4 mag (May 31, Ken-ichi Kadota). Fading gradually. In the Northern Hemisphere, it stays observable in good condition. 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)  
June 10   0 58.45   35 56.1   2.659   2.244    55   12.4   3:00 (246, 33)  
June 17   0 59.78   35 15.9   2.615   2.299    60   12.6   2:58 (249, 37)

* 185P/Petriew

It is expected to brighten up to 11 mag in July. Now it is 14.8 mag (May 30, Thomas Lehmann). It will turn to fade out rapidly after brightening. It stays extremely low. But it will become high in autumn in the Northern Hemisphere, or in autumn in the Northern Hemisphere. Recently it is much fainter than this ephemeris. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   2  3.84   19 20.5   1.519   1.048    43   13.0   3:00 (255, 12)  
June 17   2 39.32   20 52.2   1.506   1.006    41   12.6   2:58 (252, 11)

* 81P/Wild 2

Now it is 13.1 mag (May 30, Thomas Lehmann). 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)  
June 10  17 21.09  -18 17.3   1.274   2.286   174   13.2   0:11 (  0, 37)  
June 17  17 14.32  -18 21.7   1.317   2.327   172   13.4  23:32 (  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 12.7 mag (May 23, 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 September. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   9 20.63  -30  3.0   5.803   5.717    80   13.4  20:58 ( 56, -5)  
June 17   9 25.05  -29 59.8   5.921   5.761    76   13.5  21:03 ( 60, -9)

* 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 12.5 mag (May 30, Thomas Lehmann). Fading gradually. In the Northern Hemisphere, it is not observable now, but it will appear in September. In the Southern Hemisphere, it will be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   5 47.89  -17  2.8   3.124   2.451    41   13.4  20:58 ( 96,-39)  
June 17   5 53.70  -18 14.8   3.197   2.531    41   13.6  21:03 ( 99,-45)

* C/2021 S3 ( PanSTARRS )

It is expected to brighten up to 7 mag in early 2024. Now it is 14.3 mag (June 4, 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)  
June 10   6 29.82  -23 41.3   4.071   3.514    50   13.5  20:58 ( 83,-34)  
June 17   6 39.62  -23 31.1   4.020   3.442    49   13.4  21:03 ( 86,-38)

* 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 12.8 mag (June 7, Osamu Miyazaki). Fading slowly. It stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  15 17.30   21 38.5   4.509   5.191   127   13.6  22:03 (  0, 77)  
June 17  15 15.22   21 48.4   4.602   5.223   122   13.7  21:34 (  0, 77)

* 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 12.7 mag (May 31, Thomas Lehmann). Fading rapidly. It will be fainter than 18 mag in July. 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)  
June 10   1 34.27   -5 45.0   0.745   0.911    60   13.9   3:00 (280,  4)  
June 17   1 47.75   -4 32.3   0.804   0.967    62   14.7   2:58 (281,  7)

* C/2021 Y1 ( ATLAS )

The brightness evolution is slower than originally predicted. Now it is 13.6 mag (May 30, Thomas Lehmann). 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)  
June 10   6 15.15  -32 38.6   2.448   2.090    57   14.0  20:58 ( 74,-40)  
June 17   6 35.13  -34 22.9   2.441   2.111    59   14.1  21:03 ( 73,-43)

* 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 August. But it will be observable again in August. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   7  5.05   25 54.6   7.001   6.107    26   14.1  20:58 (120,  2)  
June 17   7 10.64   25 41.0   7.047   6.109    20   14.1  21:03 (124, -2)

* 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 will be getting higher gradually. 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)  
June 10   1 20.16   -3 38.3   1.959   1.733    62   14.2   3:00 (280,  8)  
June 17   1 30.43   -0 14.8   1.889   1.722    64   14.1   2:58 (280, 13)

* 71P/Clark

Now it is 13.8 mag (May 31, Thomas Lehmann). Fading gradually. 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)  
June 10   0 40.48   -5 25.0   2.104   2.028    71   14.3   3:00 (288, 15)  
June 17   0 50.65   -4 36.2   2.067   2.065    75   14.4   2:58 (290, 19)

* 77P/Longmore

Now it is 14.4 mag (May 31, Ken-ichi Kadota). 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)  
June 10  13 22.14  -32 31.8   1.617   2.391   129   14.5  20:58 ( 11, 21)  
June 17  13 22.36  -32 44.0   1.687   2.401   123   14.6  21:03 ( 18, 20)

* 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 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)  
June 10   2 43.39    3 49.8   3.943   3.236    40   14.6   3:00 (262, -5)  
June 17   2 43.34    4 26.1   3.855   3.240    46   14.5   2:58 (265,  1)

* C/2022 W3 ( Leonard )

It will brighten up to 13 mag in summer. Now it is 14.7 mag (May 28, Thomas Lehmann). 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)  
June 10   1 39.92   64  5.0   1.754   1.410    53   14.7   3:00 (211, 34)  
June 17   1 27.28   64 37.7   1.652   1.400    57   14.6   2:58 (211, 38)

* 199P/Shoemaker 4

Now it is 16.2 mag (May 30, Taras Prystavski). It stays 15 mag for a while. It locates somewhat low in the Northern Hemisphere. 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)  
June 10  18 26.56  -21 46.8   1.957   2.940   162   14.7   1:17 (  0, 33)  
June 17  18 22.05  -22 52.7   1.928   2.934   170   14.6   0:45 (  0, 32)

* C/2022 L2 ( ATLAS )

Now it is 15.2 mag (May 24, Ken-ichi Kadota). 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)  
June 10  17  3.38   22 42.5   3.101   3.879   134   14.9  23:48 (  0, 78)  
June 17  16 48.99   22  8.1   3.067   3.831   132   14.8  23:06 (  0, 77)

* C/2022 E2 ( ATLAS )

Now it is 14.9 mag (June 6, ATLAS Chile). It stays 15 mag for a while. It will be unobservable soon 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)  
June 10   8 56.36   -0 20.3   5.859   5.417    59   15.2  20:58 ( 83,  9)  
June 17   8 57.78    0 15.7   5.919   5.375    53   15.2  21:03 ( 88,  3)

* C/2021 G2 ( ATLAS )

It will brighten up to 14 mag from 2024 to 2025. Now it is 15.3 mag (June 1, 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 lower gradually. But it will be getting higher again after September. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   9 10.50  -28 23.3   6.207   6.066    77   15.3  20:58 ( 59, -5)  
June 17   9 15.67  -27 57.2   6.253   6.037    73   15.3  21:03 ( 62,-10)

* 117P/Helin-Roman-Alu 1

Now it is 15.9 mag (May 25, Thomas Lehmann). 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)  
June 10   0 24.62   -6  6.0   3.548   3.437    75   15.4   3:00 (291, 18)  
June 17   0 30.10   -5 41.6   3.467   3.452    80   15.4   2:58 (294, 22)

* 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 15.8 mag (June 1, Thomas Lehmann). Brightening rapidly. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after September. 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)  
June 10  22 20.49    8 41.5   1.461   1.890    97   15.8   3:00 (304, 50)  
June 17  22 32.23   10 56.7   1.344   1.828   100   15.4   2:58 (305, 54)

* C/2020 S4 ( PanSTARRS )

Now it is 15.8 mag (May 23, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag for a while. 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)  
June 10  10 18.37   25 34.9   3.784   3.553    69   15.6  20:58 ( 96, 39)  
June 17  10 26.55   24 51.3   3.888   3.574    64   15.7  21:03 ( 98, 34)

* C/2020 R7 ( ATLAS )

It brightened up to 13.4 mag in last summer (July 7, Giuseppe Pappa). Now it is 15.6 mag (May 31, Ken-ichi Kadota). Fading slowly. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be unobservable in October. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  16 26.00   32 44.2   3.283   3.934   123   15.8  23:11 (  0, 88)  
June 17  16 14.36   33 28.5   3.374   3.977   119   15.9  22:32 (  0, 88)

* 72P/Denning-Fujikawa

Now it is 17.3 mag (May 18, 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)  
June 10   2 58.43   14 21.1   1.429   0.788    32   15.9   3:00 (252, -1)  
June 17   3 34.89   18  8.8   1.484   0.781    29   15.9   2:58 (247, -1)

* 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 16.5 mag (May 13, Hidetaka Sato). Fading rapidly. 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 stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  15 29.45  -65 29.0   0.494   1.406   134   15.9  22:17 (  0,-10)  
June 17  15 31.20  -56  8.7   0.572   1.498   139   16.5  21:51 (  0, -1)

* 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)  
June 10  13 14.25   -1 28.3   1.411   2.099   118   16.0  20:58 ( 23, 51)  
June 17  13 23.14    0  5.4   1.529   2.149   113   16.3  21:03 ( 32, 50)

* 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 16.4 mag (June 5, Ken-ichi Kadota). It stays 16 mag for a while. It will be getting lower gradually after this, and it will be unobservable in October. 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)  
June 10  14 22.83    3 19.8   5.621   6.339   131   16.3  21:09 (  0, 58)  
June 17  14 18.62    3 20.1   5.644   6.273   124   16.2  21:03 ( 12, 58)

* 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 25, Ken-ichi Kadota). 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)  
June 10  19 17.12   51 14.9   3.984   4.291   100   16.5   2:06 (180, 74)  
June 17  19  9.45   52 32.2   3.899   4.222   101   16.4   1:31 (180, 72)

* C/2022 A3 ( Lemmon-ATLAS )

Now it is 16.8 mag (June 5, ATLAS Chile). It stays 16 mag for a while. In the Northern Hemisphere, it is not observable now, but it will appear in October. 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)  
June 10   8 24.58  -11 34.4   4.259   3.832    58   16.5  20:58 ( 79, -4)  
June 17   8 27.32  -12 17.1   4.318   3.817    54   16.5  21:03 ( 82,-10)

* 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)  
June 10   5 20.32  -67 11.0  10.295  10.348    90   16.8  20:58 ( 25,-48)  
June 17   5 24.08  -67 12.2  10.284  10.345    90   16.8   2:58 (334,-48)

* C/2022 U4 ( Bok )

Now it is 17.4 mag (June 5, ATLAS-HKO, Haleakala). 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)  
June 10  13  9.12   52 14.0   2.800   2.950    88   16.8  20:58 (151, 70)  
June 17  13 14.29   50 54.4   2.834   2.938    85   16.8  21:03 (141, 67)

* C/2022 JK5 ( PanSTARRS )

The ATLAS search program detected its cometary activity in April. Now it is 16.4 mag (May 29, 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)  
June 10  23 25.07  -24 11.4   2.419   2.721    96   16.9   3:00 (315, 15)  
June 17  23 33.23  -24  7.8   2.357   2.733   100   16.8   2:58 (318, 18)

* 219P/LINEAR

Now it is 16.9 mag (May 27, Jost Jahn). 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)  
June 10  18 17.75  -12 26.3   1.855   2.833   160   17.0   1:08 (  0, 43)  
June 17  18 12.71  -11 56.0   1.814   2.811   166   16.9   0:35 (  0, 43)

* 213P/Van Ness

It has not been observed yet in this apparition. It will brighten very rapidly, and it is expected to brighten up to 15 mag in summer. Brightening 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)  
June 10  17  8.21  -37 37.5   1.301   2.298   165   17.2  23:54 (  0, 17)  
June 17  17  1.37  -37  7.9   1.279   2.273   163   16.9  23:20 (  0, 18)

* 287P/Christensen

Now it is 18 mag (May 11, Giuseppe Pappa). 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)  
June 10  22 55.85   -8  6.9   2.751   3.037    96   17.2   3:00 (310, 32)  
June 17  23  0.83   -8  9.4   2.657   3.036   102   17.1   2:58 (315, 35)

* C/2020 F2 ( ATLAS )

Now it is 17.0 mag (May 23, Toshihiko Ikemura, Hirohisa Sato). 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)  
June 10  12 21.12   14 26.3   8.790   9.022   100   17.1  20:58 ( 57, 58)  
June 17  12 19.14   14 28.2   8.918   9.031    93   17.1  21:03 ( 67, 51)

* 94P/Russell 4

Now it is 17.4 mag (May 25, ATLAS-HKO, Haleakala). Fading slowly. It will be fainter than 18 mag in August. It locates somewhat low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   9 58.43   18 21.1   2.425   2.231    66   17.1  20:58 ( 91, 32)  
June 17  10 10.64   17  3.4   2.497   2.235    63   17.2  21:03 ( 92, 27)

* 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. 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)  
June 10  10 17.56   16  7.0   2.535   2.421    71   17.1  20:58 ( 86, 35)  
June 17  10 28.48   15 12.4   2.645   2.454    68   17.3  21:03 ( 88, 30)

* C/2014 UN271 ( Bernardinelli-Bernstein )

Very large comet. It is expected to brighten up to 14 mag in 2031. Now it is 16.1 mag (June 1, 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)  
June 10   3 12.56  -57 54.3  17.644  17.576    84   17.2   3:00 (320,-37)  
June 17   3 15.52  -58  8.9  17.578  17.551    86   17.2   2:58 (321,-34)

* C/2018 U1 ( Lemmon )

It brightened up to 13.6 mag in 2021 (June 17, 2021, R. Carstens). Now it is 17.6 mag (May 13, ATLAS Chile). It stays 18 mag for a while. In the Northern Hemisphere, it will never be observable after this. In the Southern Hemisphere, it stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  11  6.12  -66 49.2   6.212   6.638   110   17.2  20:58 ( 17,-18)  
June 17  11  2.58  -65 45.1   6.294   6.671   107   17.3  21:03 ( 21,-19)

* 116P/Wild 4

It brightened up to 12.7 mag in last year (Feb. 27, 2022, Jose Guilherme de S. Aguiar). Now it is 17.4 mag (June 2, J. L. Virlichie, P. Traverse, H. Roy). Fading gradually. 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)  
June 10  20  3.87  -25 29.6   2.184   3.037   140   17.3   2:54 (  0, 30)  
June 17  20  0.09  -25 47.8   2.153   3.062   147   17.3   2:22 (  0, 29)

* 180P/NEAT

Now it is 17.5 mag (June 8, ATLAS-HKO, Haleakala). 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)  
June 10  10 19.15   27 16.2   2.689   2.509    68   17.3  20:58 ( 98, 40)  
June 17  10 29.60   25 54.1   2.758   2.506    65   17.4  21:03 ( 99, 35)

* C/2020 Y2 ( ATLAS )

It brightened up to 14.1 mag in 2022 spring (Mar. 22, 2022, Chris Wyatt). It was expected to brighten up to 13 mag. But actually, it was fainter than originally expected. It stays 18 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 higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   2 58.97   -5 31.5   5.266   4.574    42   17.4   3:00 (268,-13)  
June 17   3  1.28   -4 58.5   5.239   4.619    47   17.4   2:58 (271, -8)

* P/2014 OL465 ( PanSTARRS )

It showed cometary activity in 2023, and brightened rapidly. Now it is 17.2 mag (May 27, Jean-Claude Merlin). 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)  
June 10  14 16.12  -43 26.8   2.580   3.410   138   17.5  21:03 (  0, 12)  
June 17  14 14.94  -42 33.4   2.632   3.415   133   17.5  21:03 (  5, 12)

* 80P/Peters-Hartley

Now it is 17.6 mag (May 25, Ken-ichi Kadota). Fading gradually. It will be fainter than 18 mag in July. In the Northern Hemisphere, it stays observable in good condition. It locates somewhat low in the Southern Hemisphere. It looks diffuse, but it has a large coma. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  22 22.48   21 50.7   2.147   2.404    91   17.5   3:00 (286, 58)  
June 17  22 24.26   23 49.4   2.119   2.449    96   17.6   2:58 (288, 64)

* P/2008 L2 ( Hill )

First return of a new periodic comet which brightened up to 15 mag in 2008. It has not been recovered yet in this apparition. It stays 18 mag for a while. In the Northern Hemisphere, it will be getting higher gradually. It locates somewhat low in the Southern Hemisphere. But it will become high in autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   1 42.03   20 53.1   2.898   2.345    48   17.7   3:00 (256, 17)  
June 17   1 55.64   21 28.4   2.848   2.353    51   17.6   2:58 (257, 20)

* 99P/Kowal 1

It brightened up to 15.9 mag in 2022 spring (May 5, Toshiyuki Takahashi). Now it is 16.8 mag (May 25, Ken-ichi Kadota). It stays 18 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)  
June 10  16  3.66  -24 11.8   3.976   4.963   164   17.6  22:50 (  0, 31)  
June 17  16  0.32  -24  3.9   4.018   4.970   157   17.6  22:19 (  0, 31)

* C/2019 O3 ( Palomar )

Now it is 17.2 mag (May 24, 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)  
June 10  16 26.92   80 20.0  10.192  10.005    76   17.7  23:08 (180, 45)  
June 17  16  6.46   80 17.3  10.228  10.024    75   17.8  22:21 (180, 45)

* C/2022 V2 ( Lemmon )

It will brighten up to 16 mag in next winter. Now it is 18.2 mag (May 24, Ken-ichi Kadota). 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 September. But it will be observable again in September. In the Southern Hemisphere, it is not observable now. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  11 42.48   71 53.8   2.794   2.639    70   17.9  20:58 (163, 49)  
June 17  11 26.78   68  7.1   2.809   2.592    67   17.9  21:03 (155, 47)

* C/2020 H6 ( ATLAS )

Now it is 17.6 mag (June 5, A. Diepvens). 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)  
June 10  18 37.52   64 18.9   6.569   6.666    91   17.9   1:26 (180, 61)  
June 17  18 32.23   64 45.9   6.602   6.702    91   17.9   0:53 (180, 60)

* C/2022 T1 ( Lemmon )

It will brighten up to 16 mag in 2024 spring. Now it is 18.3 mag (May 24, ATLAS South Africa). It stays 18 mag for a while. It will be unobservable soon in the Northern Hemisphere, or in August in the Southern Hemisphere. But it will be observable again in October in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   9  3.48   -4 41.8   4.499   4.142    63   17.9  20:58 ( 79,  8)  
June 17   9 10.23   -4 47.1   4.545   4.108    58   17.9  21:03 ( 82,  3)

* 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, Taras Prystavski). 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)  
June 10  20 39.53  -77 55.9   2.812   3.433   119   18.2   3:00 (358,-23)  
June 17  20 21.36  -77 53.9   2.804   3.455   122   18.2   2:46 (  0,-23)

* 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)  
June 10  15 37.00   24  5.6   1.550   2.316   127   20.5  22:21 (  0, 79)  
June 17  15  9.30   22 37.0   1.682   2.375   121   20.8  21:26 (  0, 77)

* 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)  
June 10  13 45.15    6 11.0   1.986   2.667   122   21.8  20:58 ( 14, 60)  
June 17  13 46.41    5 28.0   2.050   2.661   116   21.8  21:03 ( 27, 57)

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