Weekly Information about Bright Comets (2023 June 17: North)

Japanese version
Home page
 Updated on June 17, 2023
Last week South Next week

Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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

* C/2023 E1 ( ATLAS )

It brightened very rapidly. Now it is 10.7 mag (June 16, 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 17  13  1.57   74 55.9   0.714   1.053    72    9.7  21:03 (170, 48)  
June 24  13 38.81   77 24.4   0.683   1.033    71    9.5  21:04 (173, 46)

* C/2021 T4 ( Lemmon )

Now it is 10.6 mag (June 1, Thomas Lehmann). It will turn to fade out rapidly after brightening. In the Northern Hemisphere, it will be unobservable in October. 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 17   0 35.29  -18 45.3   1.335   1.609    85   10.2   2:58 (303, 12)  
June 24   0 25.83  -22 37.3   1.115   1.574    95    9.7   3:00 (313, 16)

* 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 17   3  3.99   18  3.9   3.007   2.274    36   10.0   2:58 (251,  5)  
June 24   3  7.05   16 35.9   2.927   2.291    42    9.9   3:00 (256,  9)

* C/2017 K2 ( PanSTARRS )

It brightened up to 8 mag from 2022 summer to 2023 spring. Now it is 10.8 mag (June 10, Chris Wyatt). 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 17   5 44.70  -13 30.5   3.580   2.834    36   10.9  21:03 (106,-44)  
June 24   5 52.51  -12 28.1   3.654   2.895    36   11.1   3:00 (255,-41)

* C/2022 A2 ( PanSTARRS )

It brightened up to 9.5 mag from winter to early spring (Jan. 30, Katsumi Yoshimoto). Now it is 12.2 mag (June 16, Osamu Miyazaki). 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 17   0 59.78   35 15.9   2.615   2.299    60   12.0   2:58 (249, 37)  
June 24   0 59.93   34 31.7   2.562   2.356    66   12.1   3:00 (253, 43)

* 185P/Petriew

It is expected to brighten up to 11 mag in July. Now it is 14.6 mag (June 14, Masayuki Suzuki). 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 17   2 39.32   20 52.2   1.506   1.006    41   12.6   2:58 (252, 11)  
June 24   3 15.80   21 56.5   1.505   0.972    39   12.1   3:00 (251, 11)

* C/2019 U5 ( PanSTARRS )

Now it is 12.3 mag (June 13, Juan Jose Gonzalez). 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, or in October in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17  10 21.71   -6 10.2   3.826   3.694    74   12.2  21:03 ( 70, 16)  
June 24  10 20.68   -6 48.7   3.956   3.707    68   12.3  21:04 ( 74, 10)

* 237P/LINEAR

It brightened very rapidly as expected. Now it is 12.2 mag (June 16, 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 17  20  0.07   -4 11.8   1.111   2.005   141   12.3   2:22 (  0, 51)  
June 24  19 57.74   -2 48.9   1.086   2.013   146   12.3   1:52 (  0, 52)

* C/2020 K1 ( PanSTARRS )

Now it is 12.4 mag (June 10, Thomas Lehmann). 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 17  21  5.74  -81 30.4   2.481   3.097   118   12.4   2:58 (359,-26)  
June 24  20 44.60  -85  1.8   2.506   3.106   117   12.4   2:45 (  0,-30)

* C/2021 S3 ( PanSTARRS )

It is expected to brighten up to 7 mag in early 2024. Now it is 13.8 mag (June 9, Chris Wyatt). 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 17   6 39.62  -23 31.1   4.020   3.442    49   13.4  21:03 ( 86,-38)  
June 24   6 49.86  -23 26.7   3.965   3.370    47   13.3  21:04 ( 89,-42)

* 81P/Wild 2

Now it is 12.6 mag (June 10, 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 17  17 14.32  -18 21.7   1.317   2.327   172   13.4  23:32 (  0, 37)  
June 24  17  8.26  -18 27.8   1.372   2.368   165   13.6  22:59 (  0, 36)

* 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 (June 10, Chris Wyatt). Fading slowly. In the Northern Hemisphere, it is not observable now. In the Southern Hemisphere, it will be getting lower gradually. But it will be getting higher again after September. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17   9 25.05  -29 59.8   5.921   5.761    76   13.5  21:03 ( 60, -9)  
June 24   9 29.76  -30  0.9   6.038   5.805    72   13.6  21:04 ( 63,-14)

* 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 13.1 mag (June 10, Chris Wyatt). 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 17   5 53.70  -18 14.8   3.197   2.531    41   13.6  21:03 ( 99,-45)  
June 24   5 59.41  -19 32.4   3.260   2.611    43   13.7   3:00 (262,-46)

* 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 13.3 mag (June 9, Thomas Lehmann). Fading slowly. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in October. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17  15 15.22   21 48.4   4.602   5.223   122   13.7  21:34 (  0, 77)  
June 24  15 13.63   21 51.3   4.703   5.256   117   13.8  21:05 (  0, 77)

* 126P/IRAS

It will brighten rapidly up to 13.5 mag in summer. Now it is 15.6 mag (June 11, A. Hale). 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 17   1 30.43   -0 14.8   1.889   1.722    64   14.1   2:58 (280, 13)  
June 24   1 40.32    3 15.8   1.821   1.715    67   14.0   3:00 (280, 19)

* C/2021 Y1 ( ATLAS )

The brightness evolution is slower than originally predicted. Now it is 13.7 mag (June 8, 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 17   6 35.13  -34 22.9   2.441   2.111    59   14.1  21:03 ( 73,-43)  
June 24   6 56.36  -36  9.1   2.440   2.135    60   14.1  21:04 ( 71,-45)

* 29P/Schwassmann-Wachmann 1

Now it is 16.9 mag (June 3, Jean-Francois Soulier). It stays 14 mag for a while. Now it is not observable. It will appear in August. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17   7 10.64   25 41.0   7.047   6.109    20   14.1  21:03 (124, -2)  
June 24   7 16.32   25 26.8   7.084   6.111    15   14.1  21:04 (127, -7)

* C/2022 W3 ( Leonard )

It will brighten up to 13 mag in summer. Now it is 14.7 mag (June 11, 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 17   1 27.28   64 37.7   1.652   1.400    57   14.6   2:58 (211, 38)  
June 24   1  9.71   65 12.9   1.539   1.398    62   14.4   3:00 (210, 43)

* 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 17   0 50.65   -4 36.2   2.067   2.065    75   14.4   2:58 (290, 19)  
June 24   0 59.95   -3 53.8   2.028   2.102    79   14.5   3:00 (293, 23)

* C/2021 X1 ( Maury-Attard )

Now it is 14.9 mag (Mar. 19, Masayoshi Yoshimi). It stays 14 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 17   2 43.34    4 26.1   3.855   3.240    46   14.5   2:58 (265,  1)  
June 24   2 42.76    4 59.9   3.756   3.244    52   14.5   3:00 (269,  8)

* 199P/Shoemaker 4

Now it is 14.7 mag (June 13, Jean-Claude Merlin). 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)  
June 17  18 22.05  -22 52.7   1.928   2.934   170   14.6   0:45 (  0, 32)  
June 24  18 17.06  -24  0.1   1.912   2.928   177   14.6   0:12 (  0, 31)

* 77P/Longmore

Now it is 14.4 mag (June 8, Thomas Lehmann). 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 17  13 22.36  -32 44.0   1.687   2.401   123   14.6  21:03 ( 18, 20)  
June 24  13 24.23  -32 58.2   1.763   2.410   117   14.8  21:04 ( 24, 17)

* 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 14.6 mag (June 15, ATLAS Chile). 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 17   1 47.75   -4 32.3   0.804   0.967    62   14.7   2:58 (281,  7)  
June 24   1 59.93   -3 24.1   0.854   1.030    66   15.5   3:00 (282, 12)

* C/2022 L2 ( ATLAS )

Now it is 15.3 mag (June 10, Thomas Lehmann). It stays 15 mag for a while. In the Northern Hemisphere, it stays observable in good condition. In the Southern Hemisphere, it will be getting lower gradually after this, and it will be unobservable in October. 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 17  16 48.99   22  8.1   3.067   3.831   132   14.8  23:06 (  0, 77)  
June 24  16 34.74   21 17.5   3.052   3.784   129   14.8  22:24 (  0, 76)

* 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 17  22 32.23   10 56.7   1.344   1.828   100   15.4   2:58 (305, 54)  
June 24  22 44.43   13 21.0   1.231   1.766   103   14.9   3:00 (308, 59)

* C/2022 E2 ( ATLAS )

Now it is 14.9 mag (June 6, ATLAS Chile). Brightening slowly. 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 17   8 57.78    0 15.7   5.919   5.375    53   15.2  21:03 ( 88,  3)  
June 24   8 59.56    0 47.8   5.972   5.334    47   15.2  21:04 ( 93, -2)

* C/2021 G2 ( ATLAS )

It will brighten up to 14 mag from 2024 to 2025. Now it is 15.4 mag (June 9, Thomas Lehmann). 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 17   9 15.67  -27 57.2   6.253   6.037    73   15.3  21:03 ( 62,-10)  
June 24   9 21.16  -27 35.3   6.297   6.008    69   15.3  21:04 ( 66,-14)

* 117P/Helin-Roman-Alu 1

Now it is 15.9 mag (May 31, Taras Prystavski). 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 17   0 30.10   -5 41.7   3.467   3.452    80   15.4   2:58 (294, 22)  
June 24   0 35.00   -5 21.7   3.384   3.466    86   15.4   3:00 (298, 27)

* 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 17  10 26.55   24 51.3   3.888   3.574    64   15.7  21:03 ( 98, 34)  
June 24  10 34.97   24  5.5   3.989   3.596    60   15.7  21:04 (100, 30)

* C/2020 R7 ( ATLAS )

It brightened up to 13.4 mag in last summer (July 7, 2022, Giuseppe Pappa). Now it is 15.7 mag (June 10, Thomas Lehmann). 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 17  16 14.36   33 28.5   3.374   3.977   119   15.9  22:32 (  0, 88)  
June 24  16  3.59   33 55.6   3.478   4.020   115   16.0  21:54 (  0, 89)

* 72P/Denning-Fujikawa

Now it is 16.9 mag (June 10, M. Jaeger, L. Demetz). 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 17   3 34.89   18  8.8   1.484   0.781    29   15.9   2:58 (247, -1)  
June 24   4 11.12   21 19.0   1.549   0.794    27   16.1   3:00 (244,  0)

* 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 16.7 mag (June 16, ATLAS Chile). 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 17  14 18.62    3 20.1   5.644   6.273   124   16.2  21:03 ( 12, 58)  
June 24  14 14.85    3 16.6   5.676   6.207   117   16.2  21:04 ( 26, 55)

* 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 17.0 mag (June 16, J. Salto). 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 17  19  9.45   52 32.2   3.899   4.222   101   16.4   1:31 (180, 72)  
June 24  19  0.51   53 39.2   3.819   4.153   102   16.3   0:55 (180, 71)

* C/2023 B2 ( ATLAS )

It brightened rapidly up to 14.3 mag in April (Apr. 17, Hidetaka Sato). Now it is 16.0 mag (June 7, Masayoshi Yoshimi). 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 17  13 23.14    0  5.4   1.529   2.149   113   16.3  21:03 ( 32, 50)  
June 24  13 32.16    1 14.9   1.654   2.200   108   16.6  21:04 ( 40, 49)

* 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. 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 17   8 27.32  -12 17.1   4.318   3.817    54   16.5  21:03 ( 82,-10)  
June 24   8 30.46  -13  4.4   4.369   3.802    50   16.5  21:04 ( 85,-16)

* 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 17.4 mag (June 8, J. L. Virlichie, P. Traverse, H. Roy, G. Houdin). Fading rapidly. It will be fainter than 18 mag in July. 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 17  15 31.20  -56  8.7   0.572   1.498   139   16.5  21:51 (  0, -1)  
June 24  15 34.48  -48 53.0   0.667   1.589   140   17.1  21:26 (  0,  7)

* 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 17  17  1.37  -37  7.9   1.279   2.273   163   16.9  23:20 (  0, 18)  
June 24  16 54.89  -36 28.1   1.268   2.249   159   16.6  22:46 (  0, 19)

* 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 17   5 24.08  -67 12.2  10.284  10.345    90   16.8   2:58 (334,-48)  
June 24   5 27.82  -67 17.8  10.273  10.342    91   16.8   3:00 (333,-45)

* 219P/LINEAR

Now it is 16.9 mag (June 12, M. Urbanik). 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 17  18 12.69  -11 56.1   1.814   2.811   166   16.9   0:35 (  0, 43)  
June 24  18  7.24  -11 29.4   1.787   2.789   168   16.8   0:02 (  0, 43)

* C/2022 JK5 ( PanSTARRS )

The ATLAS search program detected its cometary activity in April. Now it is 15.9 mag (June 16, Jean-Claude Merlin). 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)  
June 17  23 33.23  -24  7.8   2.357   2.733   100   16.8   2:58 (318, 18)  
June 24  23 40.48  -24  9.5   2.297   2.747   105   16.8   3:00 (322, 21)

* 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. 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 17  13 14.29   50 54.4   2.834   2.938    85   16.8  21:03 (141, 67)  
June 24  13 20.44   49 26.9   2.867   2.927    83   16.9  21:04 (133, 65)

* 287P/Christensen

Now it is 18.7 mag (June 16, Jean-Claude Merlin). 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 17  23  0.04   -8 10.6   2.654   3.036   102   17.1   2:58 (315, 35)  
June 24  23  4.24   -8 20.0   2.563   3.035   107   17.0   3:00 (321, 39)

* 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. But it will be observable again in October in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17  12 19.14   14 28.2   8.918   9.031    93   17.1  21:03 ( 67, 51)  
June 24  12 17.56   14 27.7   9.047   9.039    86   17.2  21:04 ( 74, 46)

* 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 17   3 15.52  -58  8.9  17.578  17.551    86   17.2   2:58 (321,-34)  
June 24   3 18.36  -58 25.7  17.512  17.526    89   17.2   3:00 (322,-31)

* 94P/Russell 4

Now it is 17.4 mag (May 25, ATLAS-HKO, Haleakala). Fading gradually. 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 17  10 10.64   17  3.4   2.497   2.235    63   17.2  21:03 ( 92, 27)  
June 24  10 23.01   15 42.5   2.567   2.240    60   17.3  21:04 ( 93, 23)

* C/2018 U1 ( Lemmon )

It brightened up to 13.6 mag in 2021 (June 17, 2021, R. Carstens). Now it is 17.3 mag (June 9, D. Husar, M. Junius, S. Messner). 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 17  11  2.58  -65 45.1   6.294   6.671   107   17.3  21:03 ( 21,-19)  
June 24  11  0.47  -64 44.8   6.382   6.704   104   17.3  21:04 ( 24,-21)

* 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 17  20  0.09  -25 47.8   2.153   3.062   147   17.3   2:22 (  0, 29)  
June 24  19 55.35  -26  6.5   2.134   3.088   155   17.4   1:50 (  0, 29)

* 118P/Shoemaker-Levy 4

It brightened up to 12.4 mag in winter (Feb. 10, Taras Prystavski). Now it is 18.0 mag (June 12, ATLAS Chile). 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 17  10 28.48   15 12.4   2.645   2.454    68   17.3  21:03 ( 88, 30)  
June 24  10 39.43   14 15.3   2.754   2.487    64   17.5  21:04 ( 90, 26)

* C/2023 K1 ( ATLAS )

Now it is 17.3 mag (June 13, J. L. Virlichie, P. Traverse, H. Roy, G. Houdin). Fading slowly. It will be fainter than 18 mag in September. 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 17  21  2.69  -77  5.2   1.560   2.258   121   17.5   2:58 (358,-22)  
June 24  18 29.48  -79 35.5   1.493   2.224   123   17.3   0:36 (  0,-25)

* 180P/NEAT

Now it is 17.5 mag (June 16, ATLAS-HKO, Haleakala). It stays 18 mag for a while. It locates somewhat low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17  10 29.60   25 54.1   2.758   2.506    65   17.4  21:03 ( 99, 35)  
June 24  10 40.34   24 29.4   2.825   2.504    61   17.4  21:04 ( 99, 31)

* 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 stays observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17   3  1.28   -4 58.5   5.239   4.619    47   17.4   2:58 (271, -8)  
June 24   3  3.24   -4 29.4   5.203   4.664    53   17.4   3:00 (274, -2)

* 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 17  14 14.94  -42 33.4   2.632   3.415   133   17.5  21:03 (  5, 12)  
June 24  14 14.95  -41 40.5   2.693   3.421   128   17.6  21:04 ( 11, 12)

* P/2023 L1 ( Hill )

First return of a new periodic comet which brightened up to 15 mag in 2008. Now it is 18.1 mag (June 8, R. Kresken, F. Ocana, M. Micheli, L. Conversi). 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 17   1 56.84   21 26.0   2.854   2.354    51   17.6   2:58 (257, 20)  
June 24   2 10.19   21 55.2   2.803   2.363    54   17.6   3:00 (259, 23)

* 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 17  22 24.26   23 49.4   2.119   2.449    96   17.6   2:58 (288, 64)  
June 24  22 24.76   25 40.8   2.093   2.494   100   17.7   3:00 (293, 71)

* 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 17  16  0.32  -24  3.9   4.018   4.970   157   17.6  22:19 (  0, 31)  
June 24  15 57.40  -23 56.1   4.072   4.979   150   17.7  21:48 (  0, 31)

* C/2022 QE78 ( ATLAS )

Now it is 17.8 mag (Feb. 26, Jean-Claude Merlin). It stays 17 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 getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17   4 18.92   -9 10.1   8.742   7.967    38   17.7   2:58 (263,-26)  
June 24   4 23.03   -9  2.0   8.666   7.933    41   17.7   3:00 (266,-21)

* C/2019 O3 ( Palomar )

Now it is 17.2 mag (June 11, 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 17  16  6.46   80 17.3  10.228  10.024    75   17.8  22:21 (180, 45)  
June 24  15 47.28   80  6.1  10.262  10.043    74   17.8  21:34 (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 17  11 26.78   68  7.1   2.809   2.592    67   17.9  21:03 (155, 47)  
June 24  11 17.94   64 18.3   2.831   2.546    63   17.8  21:04 (148, 45)

* 32P/Comas Sola

It has not been observed yet in this apparition. It is expected to brighten up to 14 mag in winter. Brightening 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 17   2  5.84    7  9.3   3.726   3.229    53   18.0   2:58 (268, 10)  
June 24   2 14.11    7 55.8   3.609   3.191    58   17.8   3:00 (271, 15)

* C/2022 S4 ( Lemmon )

It is expected to brighten up to 14 mag in 2024 summer. At the high light, it is not observable in the Northern Hemisphere. Now it is 18.6 mag (Feb. 16, Toshihiko Ikemura, Hirohisa Sato). Brightening gradually. It will be getting higher gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17   3  3.52   10 23.1   5.495   4.753    39   18.0   2:58 (258,  1)  
June 24   3  7.85    9 57.0   5.364   4.702    45   17.9   3:00 (261,  5)

* 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 17   9 10.23   -4 47.1   4.545   4.108    58   17.9  21:03 ( 82,  3)  
June 24   9 17.37   -4 56.6   4.587   4.075    54   17.9  21:04 ( 85, -2)

* 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 17  18 32.23   64 45.9   6.602   6.702    91   17.9   0:53 (180, 60)  
June 24  18 26.61   65  4.7   6.636   6.738    91   18.0   0:20 (180, 60)

* C/2021 C5 ( PanSTARRS )

It was predicted to brighten up to 16 mag in 2023. But actually, it is very faint as 18.3 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. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 17  20 21.36  -77 53.9   2.804   3.455   122   18.2   2:46 (  0,-23)  
June 24  20  0.47  -77 36.7   2.804   3.479   124   18.2   1:58 (  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 19.8 mag (May 28, Mt. Lemmon Survey). It will fade out rapidly after this. 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)  
June 17  15  9.31   22 37.0   1.682   2.375   121   20.8  21:26 (  0, 77)  
June 24  14 47.47   20 53.5   1.837   2.434   113   21.1  21:04 ( 24, 74)

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

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