Weekly Information about Bright Comets (2020 June 6: North)

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Updated on June 6, 2020
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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/2019 U6 ( Lemmon )

Now it is very bright as 6.8 mag (June 5, Chris Wyatt). It approaches to Sun down to 0.9 a.u. in June, and brightens up to 5.5 mag. In the Southern Hemisphere, it stays observable in good condition for a long time after this. In the Northern Hemisphere, it is not observable until late June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   7 32.35  -17 59.4   1.006   0.943    55    6.0  20:56 ( 78,-15)  
June 13   8 15.84  -15  6.6   0.920   0.920    56    5.6  21:01 ( 79,-11)  

* C/2020 F3 ( NEOWISE )

Now it is very bright as 7.5 mag (June 5, Chris Wyatt). It will approach to Sun down to 0.3 a.u. on July 3, and it is expected to brighten up to 2.5 mag. In the Southern Hemisphere, it stays observable in good condition until early June when it brightens up to 8 mag. But it will not be observable around the perihelion passage. In the Northern Hemisphere, it is not observable now. It will appear in the evening sky at 3-4 mag in mid July, then it stays observable while getting fainter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   6  2.77    1 36.2   1.585   0.813    26    7.6  20:56 (109,-22)  
June 13   6  1.01    6 52.2   1.541   0.660    18    6.6  21:01 (120,-25)  

* C/2020 F8 ( SWAN )

It brightened up to 4.7 mag in early May (May 2, Marco Goiato). However, it is fading and getting diffused after that. It has already faded down to 7.3 mag (May 21, Mitsunori Tsumura). It is not observable until August after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   5 29.44   43 18.7   1.265   0.495    21    8.2  20:56 (144,  2)  
June 13   5 49.39   39 33.2   1.491   0.600    17    9.3  21:01 (143, -2)  

* C/2017 T2 ( PanSTARRS )

Now it is 8.4 mag (May 27, Charles S. Morris). It stays bright as 8-9 mag until July. It is observable in good condition in the Northern Hemisphere. In the Southern Hemisphere, it is not observable until late June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  11 16.62   61 17.7   1.667   1.672    72    8.2  20:56 (148, 54)  
June 13  11 42.61   55 58.0   1.686   1.699    73    8.3  21:01 (139, 55)  

* 2P/Encke

It will approach to Sun down to 0.34 a.u. and brighten up to 7 mag in June. In the Southern Hemisphere, it will appear in the evening sky at 7 mag in early July. Then it stays observable in good condition while the comet will be fading. In the Northern Hemisphere, it is not observable until mid August when the comet will fade down to 12 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   4 51.63   26 51.9   1.609   0.603     4    9.8   3:01 (222,-14)  
June 13   5 40.05   26 41.0   1.481   0.476     4    8.9  21:01 (136,-13)  

* 58P/Jackson-Neujmin

Recovered from SWAN images after 24-year blank. Now it is very bright as 10.2 mag (May 31, Marco Goiato). It stays 10-11 mag until August. In the Southern Hemisphere, it stays observable in the morning sky for a long time. In the Northern Hemisphere, it is too low to observe until July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   2 16.71    9 11.5   1.984   1.382    40   10.0   3:01 (260,  2)  
June 13   2 40.01   10 16.9   1.977   1.392    41   10.1   2:58 (259,  3)  

* 249P/LINEAR

Now it is 15.9 mag (May 31, Artyom Novichonok). It was expected to brighten rapidly up to 9.5 mag in June. But actually, it is much fainter than expected. It has finally started brightening in late May. It is not observable in June. It will be observable in good condition after July while the comet will be fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   7 25.25   21  2.1   0.430   0.703    34   11.2  20:56 (112,  5)  
June 13   6 38.78   25 27.1   0.436   0.611    16   10.3  21:01 (127, -6)  

* C/2019 Y1 ( ATLAS )

Now it is 11.2 mag (May 29, Paul Camilleri). It continued brightening for a while even after the perihelion passage on Mar. 15. It will be fading after this. It stays observable for a long time in the Northern Hemisphere. It is observable in the evening sky after this also in the Southern Hemisphere. It seems to be a fragment of C/1988 A1 (Liller), like C/1996 Q1 (Tabur) and C/2015 F3 (SWAN).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  11 38.49   42 52.2   1.453   1.652    81   11.2  20:56 (116, 62)  
June 13  11 48.28   36 20.0   1.591   1.744    80   11.8  21:01 (103, 57)  

* 88P/Howell

Now it is 12.8 mag (May 26, Paul Camilleri). Brightening very rapidly. It will brighten up to 8-9 mag from summer to autumn. It will be observable in excellent condition in the Southern Hemisphere. It locates very low around the high light in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  12 39.40   -2  9.2   1.126   1.800   114   11.9  20:56 ( 30, 48)  
June 13  12 41.65   -2 52.3   1.146   1.756   108   11.7  21:01 ( 39, 44)  

* C/2019 Y4 ( ATLAS )

Fragment of C/1844 Y1 (Great Comet). It brightened up to 7.0 mag in late March ((Mar. 30, Charles S. Morris). But the nucleus was split into some fragments, and it is fading after that. Now it is 9.1 mag (May 17, Sandor Szabo). It approached to Sun down to 0.25 a.u. on May 31. In the Northern Hemisphere, it is not observable after this. In the Southern Hemisphere, it appears in the morning sky in late June, but it locates extremely low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   4  2.45   10 33.0   1.054   0.322    17   11.7   3:01 (242,-18)  
June 13   4 36.27    6 18.0   1.271   0.482    20   13.9   2:58 (244,-22)  

* C/2019 N1 ( ATLAS )

Now it is 14.6 mag (June 1, Thomas Lehmann). It will brighten up to 10.5 mag from 2020 December to 2021 January. In the Northern Hemisphere, it stays observable in good condition while the comet will be brightening gradually, but it is not observable at the high light. In the Southern Hemisphere, it is not observable for a long time, but it will be observable in good condition after the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  12 13.82   69 25.0   2.887   2.806    75   13.3  20:56 (165, 53)  
June 13  12  4.50   65 57.4   2.867   2.743    72   13.2  21:01 (156, 53)  

* 29P/Schwassmann-Wachmann 1

Appearing in the morning sky. Now it is 14.9 mag (May 27, Slooh.com Canary Islands Observatory).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   2 15.62   22 13.8   6.582   5.806    37   13.8   3:01 (249,  9)  
June 13   2 20.59   22 44.1   6.515   5.807    42   13.8   2:58 (251, 14)  

* C/2018 N2 ( ASASSN )

Now it is 13.5 mag (May 17, Thomas Lehmann). It stays bright as 13 mag until June. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   2  8.27   73 17.6   4.184   3.706    55   13.9   3:01 (200, 33)  
June 13   2 26.35   75 35.3   4.195   3.741    57   14.0   2:58 (197, 34)  

* 246P/NEAT

Now it is 14.2 mag (May 24, Paul Camilleri). It stays 13-14 mag from 2020 to 2021. It stays observable in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  12 31.06   14  2.6   2.756   3.178   105   14.2  20:56 ( 48, 61)  
June 13  12 32.70   13  4.7   2.830   3.163    99   14.2  21:01 ( 57, 56)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 15.1 mag (May 29, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2021. In 2020, it is observable at 15 mag in good condition from spring to summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  14  3.85  -21 29.3   4.102   4.923   140   15.0  21:03 (  0, 33)  
June 13  13 59.85  -21 46.8   4.138   4.883   132   15.0  21:01 (  8, 33)  

* C/2018 F4 ( PanSTARRS )

Now it is bright as 13.9 mag (Apr. 24, Chris Wyatt). It stays 15 mag until summer. It stays observable for a long time in the Southern Hemisphere. It is not observable until August in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   3  5.66  -36 18.7   4.162   3.837    64   15.0   3:01 (294,-32)  
June 13   3 10.19  -35 45.5   4.145   3.865    67   15.1   2:58 (296,-28)  

* C/2020 F5 ( MASTER )

Now it is 15.3 mag (May 22, R. Carstens). It stays 14-15 mag until 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until June in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  15 26.22  -84 33.6   4.385   4.938   117   15.1  22:27 (  0,-30)  
June 13  15  2.57  -84 19.7   4.356   4.911   117   15.1  21:36 (  0,-29)  

* C/2017 K2 ( PanSTARRS )

Now it is 15.4 mag (June 1, Thomas Lehmann). It is expected to be observable at 5-6 mag for a long time from 2022 to 2023. In the Northern Hemisphere, it is not observable at the high light from 2022 summer to 2023 summer. In the Southern Hemisphere, it is only visible in the extremely low sky in summer in 2020. But it will be observable in good condition at the high light.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  17 51.19   53 25.1   8.724   9.007   103   15.2   0:53 (180, 72)  
June 13  17 46.08   53 24.6   8.668   8.956   103   15.2   0:21 (180, 72)  

* C/2019 K7 ( Smith )

Now it is 15.3 mag (May 29, Toshihiko Ikemura, Hirohisa Sato). It stays 15-16 mag for a long time until 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  20 32.60   10 57.2   3.917   4.476   117   15.5   3:01 (340, 65)  
June 13  20 25.71   12 25.5   3.835   4.475   123   15.4   2:58 (359, 67)  

* 115P/Maury

Now it is 16.7 mag (June 2, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag from June to August, and it will be observable in good condition.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  19 25.40   -1 53.8   1.239   2.108   138   15.8   2:28 (  0, 53)  
June 13  19 25.57   -1 20.9   1.190   2.096   143   15.7   2:00 (  0, 54)  

* C/2020 J1 ( SONEAR )

Now it is 16.0 mag (May 14, iTelescope Observatory, Siding Spring). It will brighten up to 13.5 mag in spring in 2021. In the Southern Hemisphere, it stays observable in good condition for a long time. In the Northern Hemisphere, it is not observable until spring in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  22 30.31  -55 28.2   3.950   4.434   112   16.0   3:01 (339, -6)  
June 13  22 21.91  -57 17.5   3.825   4.394   117   15.8   2:58 (344, -5)  

* C/2020 H2 ( Pruyne )

Now it is 14.1 mag (May 21, Thomas Lehmann). It will fade out rapidly after this, and it will be fainter than 18 mag in late June. It stays observable in good condition in the Northern Hemisphere. It will be unobservable after this in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   8 49.66   65  6.0   1.270   1.102    56   15.9  20:56 (149, 37)  
June 13   9  7.93   59 48.5   1.475   1.185    52   16.6  21:01 (143, 34)  

* C/2019 L3 ( ATLAS )

Now it is 16.0 mag (May 29, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 12 mag in winter in 2022. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until 2021 November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   0 26.93   52  1.1   6.602   6.135    58   16.2   3:01 (228, 40)  
June 13   0 32.11   53  2.4   6.504   6.091    61   16.1   2:58 (227, 44)  

* C/2018 U1 ( Lemmon )

Now it is 16.5 mag (May 29, Toshihiko Ikemura, Hirohisa Sato). It will stay at 15 mag for a long time from 2021 to 2022. In the Northern Hemisphere, it stays observable in good condition while brightening gradually. In the Southern Hemisphere, it stays locating low for a long time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  18 42.60   34 21.9   5.786   6.322   117   16.3   1:45 (  0, 89)  
June 13  18 36.03   34 11.1   5.718   6.291   120   16.3   1:11 (  0, 89)  

* C/2017 B3 ( LINEAR )

It brightened up to 13.8 mag in autumn in 2019 (Sept. 3, Chris Wyatt). Now it is fading slowly. Now it is 15.9 mag (May 13, iTelescope Observatory, Siding Spring). In 2020, it stays observable in good condition while the comet will be fading from 16 to 17 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   0 36.02   -2 38.1   5.966   5.671    68   16.3   3:01 (284, 15)  
June 13   0 37.79   -2  3.5   5.900   5.711    74   16.3   2:58 (288, 20)  

* 210P/Christensen

It brightened up to 10.8 mag (Apr. 20, Sandor Szabo). Now it is 14.6 mag (May 28, Charles S. Morris). It will fade out rapidly, and will be fainter than 18 mag in June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   9 30.32   24 49.7   1.319   1.228    61   16.4  20:56 ( 99, 33)  
June 13  10  2.55   22  8.0   1.426   1.326    63   17.1  21:01 ( 96, 31)  

* C/2018 A6 ( Gibbs )

It brightened up to 13.2 mag from spring to autumn in 2019 (June 30, Thomas Lehmann). Now it is fading slowly. It has already faded down to 16.0 mag (Apr. 25, iTelescope Observatory, Siding Spring). In the Southern Hemisphere, it stays observable for a long time. It becomes observable also in the Northern Hemisphere, but it locates low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   0 11.82  -30 24.5   4.049   4.115    86   16.5   3:01 (309,  2)  
June 13   0 11.56  -30 16.2   3.985   4.153    92   16.5   2:58 (313,  6)  

* C/2017 U7 ( PanSTARRS )

Now it is 15.6 mag (May 22, ATLAS-MLO, Mauna Loa). It is observable at 16 mag in 2020. It is observable in excellent condition in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  19 34.03  -29 45.6   5.820   6.669   144   16.5   2:37 (  0, 25)  
June 13  19 26.88  -29 42.1   5.767   6.682   152   16.6   2:02 (  0, 25)  

* C/2020 H4 ( Leonard )

Now it is 18.8 mag (May 24, Toshihiko Ikemura, Hirohisa Sato). It will brighten very rapidly, and brighten up to 14.5 mag from August to September. In the Northern Hemisphere, it stays observable for a long time, although it becomes extremely low in early September. In the Southern Hemisphere, it is observable only until mid June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  22 40.16   32 51.0   1.495   1.674    81   17.1   3:01 (262, 57)  
June 13  22 47.20   40 34.7   1.370   1.588    82   16.7   2:58 (248, 61)  

* C/2017 Y2 ( PanSTARRS )

Now it is 16.8 mag (May 28, Toshihiko Ikemura, Hirohisa Sato). It will be observable at 16.5-17 mag from spring in 2020 to summer in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  19 16.42   24  4.9   4.168   4.787   122   16.8   2:19 (  0, 79)  
June 13  19  6.76   23 51.1   4.093   4.773   126   16.7   1:42 (  0, 79)  

* C/2019 C1 ( ATLAS )

Now it is 16.9 mag (May 18, ATLAS-MLO, Mauna Loa). It stays observable at 16-17 mag from 2020 to 2021. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  10 49.57  -16 17.8   6.426   6.585    94   16.7  20:56 ( 49, 22)  
June 13  10 52.49  -15 54.2   6.528   6.586    88   16.8  21:01 ( 55, 18)  

* 17P/Holmes

Now it is 18.8 mag (May 13, iTelescope Observatory, Siding Spring). It brightens up to 13.5 mag in winter. But it is not observable at high light. In the Southern Hemisphere, it stays observable in good condition until autumn when the comet will brighten up to 14 mag. It stays locating very low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  18 52.09  -46 53.3   1.897   2.800   146   17.0   1:55 (  0,  8)  
June 13  18 45.87  -47  5.5   1.837   2.770   151   16.8   1:21 (  0,  8)  

* C/2019 T4 ( ATLAS )

Now it is 17.4 mag (May 9, P. Camilleri, H. Williams, J. Oey). It is expected to brighten up to 13 mag in 2022. In 2020, it is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it is not observable. It will be observable from autumn to winter, but it locating extremely low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   6 46.87  -25 43.8   7.686   7.156    55   17.0  20:56 ( 77,-28)  
June 13   6 52.00  -25 32.8   7.680   7.116    53   16.9  21:01 ( 80,-34)  

* 257P/Catalina

Now it is 17.1 mag (May 19, ATLAS-MLO, Mauna Loa). It will brighten up to 16.5 mag and will be observable in good condition from June to October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  20 32.76   10 58.9   1.613   2.266   117   17.1   3:01 (340, 65)  
June 13  20 34.95   12 29.8   1.545   2.249   121   17.0   2:58 (353, 67)  

* C/2020 K3 ( Leonard )

Now it is 17.0 mag (May 23, Katsumi Yoshimoto). It brightens up to 17 mag from June to July. It is observable in excellent condition in the Northern Hemisphere. In the Southern Hemisphere, it is observable only in the extremely low sky until early June and after August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  23 52.37   45 13.0   1.728   1.585    64   17.2   3:01 (238, 45)  
June 13  23 33.82   50 42.8   1.599   1.592    71   17.0   2:58 (230, 52)  

* C/2017 M4 ( ATLAS )

It brightened up to 12-13 mag from 2018 to 2019. Now it is fading. It has already faded down to 16.9 mag (May 10, P. Camilleri, J. Oey). In the Southern Hemisphere, it stays observable in good condition for a long time. It will never be observable after this in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   9 13.91  -62  2.3   5.336   5.581    98   17.1  20:56 ( 29,-22)  
June 13   9 15.44  -60 52.3   5.432   5.628    95   17.2  21:01 ( 32,-25)  

* 87P/Bus

Now it is 17.0 mag (May 15, ATLAS-MLO, Mauna Loa). It will fade out after this, and will be fainter than 18 mag in July.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  12 46.71   -2 38.3   1.454   2.110   116   17.2  20:56 ( 27, 49)  
June 13  12 52.64   -3 13.3   1.525   2.115   111   17.3  21:01 ( 36, 45)  

* C/2020 F2 ( ATLAS )

Now it is 17.7 mag (May 26, ATLAS-MLO, Mauna Loa). It stays observable at 16-17 mag for a long time until 2024.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  15 48.46  -16 41.9   8.891   9.865   162   17.2  22:47 (  0, 38)  
June 13  15 44.31  -16 23.8   8.917   9.848   155   17.2  22:15 (  0, 39)  

* P/2019 LM4 ( Palomar )

Now it is 17.6 mag (May 24, Toshihiko Ikemura, Hirohisa Sato). It will fade out after this, and will be fainter than 18 mag in July. Charles S. Morris reported that it is fading very rapidly down to 18.4 mag on May 26.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  15  8.73    1 57.8   2.783   3.653   143   17.3  22:07 (  0, 57)  
June 13  15  4.44    1  5.4   2.872   3.689   137   17.4  21:36 (  0, 56)  

* 278P/McNaught

Now it is 17.4 mag (May 23, ATLAS-MLO, Mauna Loa). It became brighter than orignally predicted. It stays observable at 17 mag in good condition until autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  12 40.85   -8  7.5   1.568   2.221   117   17.4  20:56 ( 26, 43)  
June 13  12 44.25   -8 43.4   1.620   2.204   111   17.3  21:01 ( 35, 40)  

* C/2014 F3 ( Sheppard-Trujillo )

It will pass the perihelion in 2021, and it is predicted to be observable at 17-18 mag from 2020 to 2022. However, it has not been observed at all since 2015. It was not detected, fainter than 20.5 mag, in 2017 May (Werner Hasubick).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  20 41.02  -21 51.3   5.336   6.019   128   17.4   3:01 (348, 32)  
June 13  20 40.26  -21 53.3   5.242   6.007   135   17.4   2:58 (355, 33)  

* C/2019 T3 ( ATLAS )

Now it is 17.3 mag (Apr. 23, D. Buczynski). It will be observable at 16.5-17 mag from 2020 to 2021. In the Southern Hemisphere, it is not observable until summer in 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   2  2.28   68 22.9   6.801   6.240    52   17.5   3:01 (206, 32)  
June 13   2  4.07   68 51.8   6.758   6.226    54   17.4   2:58 (206, 34)  

* 28P/Neujmin 1

Now it is 16.8 mag (May 20, R. Carstens). It will brighten up to 15.5 mag in early 2021. In 2020, it stays observable at 17 mag until November in the Southern Hemisphere, or until July in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  14  7.57  -31 35.1   2.490   3.345   141   17.5  21:06 (  0, 23)  
June 13  14  3.41  -31  2.6   2.496   3.290   134   17.5  21:01 (  6, 24)  

* 162P/Siding Spring

Now it is 18.7 mag (Apr. 18, iTelescope Observatory, Siding Spring). It brightens up to 16 mag from summer to winter. In the Southern Hemisphere, it is observable in excellent condition. In the Northern Hemisphere, it is not observable until late October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  21 55.72  -54 32.9   1.636   2.284   117   17.7   3:01 (343, -3)  
June 13  22  5.56  -56  9.8   1.545   2.235   120   17.5   2:58 (346, -4)  

* P/2019 Y2 ( Fuls )

It brightened up to 15.9 mag in spring (Mar. 17, Purple Mountain Observatory, XuYi Station). Now it is fading. It has already faded down to 18.3 mag (May 24, Toshihiko Ikemura, Hirohisa Sato). It will be fainter than 18 mag in late June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  13  4.43   -1 44.1   1.630   2.310   119   17.5  20:56 ( 21, 51)  
June 13  13  8.18   -2 33.0   1.718   2.329   114   17.6  21:01 ( 31, 48)  

* C/2010 U3 ( Boattini )

Now it is 17.6 mag (May 21, ATLAS-MLO, Mauna Loa). It will be fading slowly after this. It is observable in good condition in the Northern Hemisphere. In the Southern Hemisphere, it is observable in the extremely low sky only in 2021 spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  12 37.52   51 10.4   8.876   8.879    86   17.6  20:56 (144, 68)  
June 13  12 37.07   50 20.9   8.960   8.892    82   17.6  21:01 (135, 65)  

* C/2017 K5 ( PanSTARRS )

Now it is 19.9 mag (May 29, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 18 mag for a long time from 2019 to 2021. However, it is much fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  19  6.48  -18 48.3   6.801   7.692   149   17.6   2:09 (  0, 36)  
June 13  19  3.23  -19 22.9   6.750   7.695   157   17.6   1:38 (  0, 36)  

* 124P/Mrkos

It brightened up to 15.9 mag in February and March (Feb. 18, Toshihiko Ikemura, Hirohisa Sato). Now it is fading. It has already faded down to 17.7 mag (May 15, A. Diepvens). It will be fainter than 18 mag in late June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  10 39.40   -9 40.7   1.357   1.691    89   17.6  20:56 ( 56, 25)  
June 13  10 49.69  -12 19.0   1.431   1.707    86   17.7  21:01 ( 58, 20)  

* 117P/Helin-Roman-Alu 1

Now it is 17.8 mag (May 24, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2022. In 2020, it is observable at 17.5 mag in good condition in spring. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  10 19.84   19  7.9   4.515   4.356    74   17.8  20:56 ( 86, 40)  
June 13  10 23.80   18 32.7   4.601   4.342    68   17.8  21:01 ( 90, 34)  

* C/2018 W2 ( Africano )

It brightened up to 8.3 mag in last September (Sept. 20, Maik Meyer). Now it is fading. It has already faded down to 17.1 mag (Apr. 5, iTelescope Observatory, Siding Spring). In the Southern Hemisphere, it stays observable for a long time after this. In the Northern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6   2 32.41  -70 29.5   3.475   3.729    96   17.8   3:01 (336,-35)  
June 13   2 56.52  -72 32.0   3.504   3.798    99   18.0   2:58 (338,-35)  

* A/2019 O3

Now it is 17.1 mag (May 18, ATLAS-HKO, Haleakala). It is observable at 17-18 mag in good condition in 2020 summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  6  19 50.26   28 54.8   8.506   8.962   113   17.9   2:52 (  0, 84)  
June 13  19 47.05   29 35.1   8.444   8.955   117   17.9   2:22 (  0, 85)  

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