Weekly Information about Bright Comets (2020 May 30: North)

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Updated on May 31, 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 6.6 mag (May 30, Marco Goiato). Brightening very rapidly. It will approach to Sun down to 0.9 a.u. in June, and it is extected to brighten 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)  
May  30   6 54.87  -19 48.1   1.107   0.980    54    6.5  20:50 ( 77,-16)  
June  6   7 32.35  -17 59.4   1.006   0.943    55    6.0  20:56 ( 78,-15)  

* 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)  
May  30   4 51.71   46 11.6   1.005   0.435    24    7.1  20:50 (146,  4)  
June  6   5 29.44   43 18.7   1.265   0.495    21    8.2  20:56 (144,  2)  

* C/2020 F3 ( NEOWISE )

Now it is very bright as 7.3 mag (May 30, Marco Goiato). 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)  
May  30   6  3.95   -3 15.6   1.611   0.961    34    8.4  20:50 ( 99,-18)  
June  6   6  2.77    1 36.2   1.585   0.813    26    7.6  20:56 (109,-22)  

* 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)  
May  30  10 43.34   66 13.1   1.659   1.650    71    8.2  20:50 (155, 52)  
June  6  11 16.62   61 17.7   1.667   1.672    72    8.2  20:56 (148, 54)  

* 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)  
May  30   4 10.55   26  4.3   1.732   0.731     5   10.5   3:04 (226,-12)  
June  6   4 51.63   26 51.9   1.609   0.603     4    9.8   3:01 (222,-14)  

* 58P/Jackson-Neujmin

Recovered from SWAN images after 24-year blank. Now it is very bright as 10.5 mag (May 26, Paul Camilleri). 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)  
May  30   1 53.20    7 57.1   1.995   1.378    39   10.0   3:04 (261,  1)  
June  6   2 16.71    9 11.5   1.984   1.382    40   10.0   3:01 (260,  2)  

* 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 approaches to Sun down to 0.25 a.u. on May 31. It was expected to brighten up to -1 mag. But actually it is too faint to observe. 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)  
May  30   3 37.02   22 24.9   0.845   0.255    11   10.1   3:04 (233, -9)  
June  6   4  2.45   10 33.0   1.054   0.322    17   11.7   3:01 (242,-18)  

* C/2019 Y1 ( ATLAS )

Now it is 11.0 mag (May 26, 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)  
May  30  11 26.33   50 25.9   1.332   1.559    82   10.6  20:50 (134, 64)  
June  6  11 38.49   42 52.2   1.453   1.652    81   11.2  20:56 (116, 62)  

* 249P/LINEAR

Now it is 17.9 mag (May 21, Catalina Sky Survey). It was expected to brighten rapidly up to 9.5 mag in June. But actually, it has not started brightening rapidly yet. It is not observable in June. However, it stays observable in good condition until May while the comet is brightening, and after July while the comet will be fading.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   7 59.55   16 27.3   0.445   0.803    49   12.2  20:50 ( 99, 16)  
June  6   7 25.25   21  2.1   0.430   0.703    34   11.2  20:56 (112,  5)  

* 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)  
May  30  12 39.05   -1 37.7   1.108   1.845   120   12.1  20:50 ( 18, 52)  
June  6  12 39.40   -2  9.2   1.126   1.800   114   11.9  20:56 ( 30, 48)  

* C/2019 N1 ( ATLAS )

Now it is 14.9 mag (May 16, 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)  
May  30  12 29.45   72 39.6   2.911   2.870    77   13.4  20:50 (173, 52)  
June  6  12 13.82   69 25.0   2.887   2.806    75   13.3  20:56 (165, 53)  

* 29P/Schwassmann-Wachmann 1

Appearing in the morning sky.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   2 10.47   21 42.8   6.640   5.805    31   13.8   3:04 (247,  5)  
June  6   2 15.62   22 13.8   6.582   5.806    37   13.8   3:01 (249,  9)  

* 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)  
May  30   1 52.94   71  0.4   4.172   3.671    54   13.9   3:04 (202, 31)  
June  6   2  8.27   73 17.6   4.184   3.706    55   13.9   3:01 (200, 33)  

* 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)  
May  30  12 30.32   14 55.7   2.685   3.193   111   14.2  20:50 ( 34, 66)  
June  6  12 31.06   14  2.6   2.756   3.178   105   14.2  20:56 ( 48, 61)  

* 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)  
May  30   3  0.68  -36 60.0   4.174   3.809    62   15.0   3:04 (294,-36)  
June  6   3  5.66  -36 18.7   4.162   3.837    64   15.0   3:01 (294,-32)  

* C/2019 F1 ( ATLAS-Africano )

Now it is 15.2 mag (May 20, R. Carstens). 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)  
May  30  14  8.41  -21 12.4   4.078   4.963   147   15.0  21:35 (  0, 34)  
June  6  14  3.85  -21 29.3   4.102   4.923   140   15.0  21:03 (  0, 33)  

* C/2020 F5 ( MASTER )

Now it is 15.4 mag (Apr. 22, Chris Wyatt). 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)  
May  30  15 53.30  -84 34.5   4.421   4.965   117   15.2  23:21 (  0,-30)  
June  6  15 26.22  -84 33.6   4.385   4.938   117   15.1  22:27 (  0,-30)  

* C/2017 K2 ( PanSTARRS )

Now it is 15.7 mag (May 26, Charles S. Morris). 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)  
May  30  17 56.09   53 19.6   8.783   9.058   102   15.3   1:26 (180, 72)  
June  6  17 51.19   53 25.1   8.724   9.007   103   15.2   0:53 (180, 72)  

* C/2020 H2 ( Pruyne )

Bright new comet. Now it is 13.2 mag (Apr. 28, Alan Hale). 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)  
May  30   8  9.72   72  6.8   1.067   1.026    59   15.2  20:50 (157, 37)  
June  6   8 49.66   65  6.0   1.270   1.102    56   15.9  20:56 (149, 37)  

* C/2019 K7 ( Smith )

Now it is 15.2 mag (May 13, Hiroshi Abe). 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)  
May  30  20 38.52    9 26.6   4.010   4.477   111   15.5   3:04 (326, 61)  
June  6  20 32.60   10 57.2   3.917   4.476   117   15.5   3:01 (340, 65)  

* 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)  
May  30   8 52.27   27 21.3   1.226   1.129    59   15.6  20:50 (102, 33)  
June  6   9 30.32   24 49.7   1.319   1.228    61   16.4  20:56 ( 99, 33)  

* 115P/Maury

Now it is 16.8 mag (May 26, Charles S. Morris). 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)  
May  30  19 24.03   -2 36.0   1.295   2.122   133   16.0   2:54 (  0, 52)  
June  6  19 25.40   -1 53.8   1.239   2.108   138   15.8   2:28 (  0, 53)  

* C/2020 J1 ( SONEAR )

New comet. 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)  
May  30  22 36.29  -53 45.7   4.083   4.474   106   16.1   3:04 (335, -7)  
June  6  22 30.31  -55 28.2   3.950   4.434   112   16.0   3:01 (339, -6)  

* C/2019 L3 ( ATLAS )

Now it is 16.4 mag (May 21, ATLAS-MLO, Mauna Loa). 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)  
May  30   0 21.47   51  1.0   6.696   6.180    55   16.2   3:04 (229, 37)  
June  6   0 26.93   52  1.1   6.602   6.135    58   16.2   3:01 (228, 40)  

* 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)  
May  30   0 33.84   -3 15.3   6.028   5.631    62   16.3   3:04 (281, 11)  
June  6   0 36.02   -2 38.1   5.966   5.671    68   16.3   3:01 (284, 15)  

* C/2018 U1 ( Lemmon )

Now it is 16.7 mag (May 20, ATLAS-MLO, Mauna Loa). 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)  
May  30  18 48.75   34 24.8   5.863   6.353   114   16.4   2:18 (  0, 89)  
June  6  18 42.60   34 21.9   5.786   6.322   117   16.3   1:45 (  0, 89)  

* 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)  
May  30   0 11.29  -30 38.1   4.113   4.077    80   16.4   3:04 (306, -2)  
June  6   0 11.82  -30 24.5   4.049   4.115    86   16.5   3:01 (309,  2)  

* C/2017 U7 ( PanSTARRS )

Now it is 15.7 mag (May 18, 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)  
May  30  19 40.68  -29 47.5   5.887   6.657   136   16.5   3:04 (358, 25)  
June  6  19 34.03  -29 45.6   5.820   6.669   144   16.5   2:37 (  0, 25)  

* 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)  
May  30  10 47.03  -16 44.8   6.325   6.583   100   16.7  20:50 ( 42, 26)  
June  6  10 49.57  -16 17.8   6.426   6.585    94   16.7  20:56 ( 49, 22)  

* C/2017 Y2 ( PanSTARRS )

Now it is 17.3 mag (May 18, W. Hasubick). 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)  
May  30  19 25.30   24  8.6   4.254   4.801   117   16.8   2:55 (  0, 79)  
June  6  19 16.42   24  4.9   4.168   4.787   122   16.8   2:19 (  0, 79)  

* 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)  
May  30   6 41.93  -25 58.5   7.687   7.197    57   17.0  20:50 ( 73,-23)  
June  6   6 46.87  -25 43.8   7.686   7.156    55   17.0  20:56 ( 77,-28)  

* 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)  
May  30   9 13.31  -63 19.5   5.244   5.535   101   17.0  20:50 ( 25,-20)  
June  6   9 13.91  -62  2.3   5.336   5.581    98   17.1  20:56 ( 29,-22)  

* 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)  
May  30  18 56.83  -46 33.2   1.968   2.830   141   17.3   2:27 (  0,  8)  
June  6  18 52.09  -46 53.3   1.897   2.800   146   17.0   1:55 (  0,  8)  

* 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)  
May  30  12 41.89   -2 11.0   1.388   2.105   121   17.1  20:50 ( 17, 51)  
June  6  12 46.71   -2 38.3   1.454   2.110   116   17.2  20:56 ( 27, 49)  

* 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)  
May  30  20 29.46    9 22.9   1.686   2.283   113   17.2   3:04 (331, 62)  
June  6  20 32.76   10 58.9   1.613   2.266   117   17.1   3:01 (340, 65)  

* C/2020 H4 ( Leonard )

Now it is 19.6 mag (May 3, Mt. Lemmon Survey). 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)  
May  30  22 33.61   26 14.1   1.638   1.761    79   17.5   3:04 (270, 51)  
June  6  22 40.16   32 51.0   1.495   1.674    81   17.1   3:01 (262, 57)  

* P/2019 LM4 ( Palomar )

Now it is 16.5 mag (May 14, R. Ligustri). 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)  
May  30  15 13.76    2 46.1   2.706   3.616   149   17.2  22:40 (  0, 58)  
June  6  15  8.73    1 57.8   2.783   3.653   143   17.3  22:07 (  0, 57)  

* C/2020 F2 ( ATLAS )

Now it is 18.0 mag (May 13, Mt. Lemmon Survey). 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)  
May  30  15 52.74  -17  0.4   8.882   9.883   170   17.2  23:19 (  0, 38)  
June  6  15 48.46  -16 41.9   8.891   9.865   162   17.2  22:47 (  0, 38)  

* C/2020 K3 ( Leonard )

New comet 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)  
May  30   0  4.10   40 21.1   1.863   1.583    58   17.3   3:04 (243, 38)  
June  6  23 52.37   45 13.0   1.728   1.585    64   17.2   3:01 (238, 45)  

* P/2019 Y2 ( Fuls )

Now it is 16.9 mag (May 10, Purple Mountain Observatory, XuYi Station). It will be fading after this, and it will be fainter than 18 mag in late June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  13  1.75   -1  0.3   1.547   2.291   125   17.3  20:50 (  9, 53)  
June  6  13  4.43   -1 44.1   1.630   2.310   119   17.5  20:56 ( 21, 51)  

* 278P/McNaught

Now it is 17.6 mag (May 19, 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)  
May  30  12 38.82   -7 38.5   1.519   2.240   123   17.4  20:50 ( 16, 46)  
June  6  12 40.85   -8  7.5   1.568   2.221   117   17.4  20:56 ( 26, 43)  

* 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)  
May  30  20 41.27  -21 50.9   5.437   6.032   121   17.5   3:04 (342, 31)  
June  6  20 41.02  -21 51.3   5.336   6.019   128   17.4   3:01 (348, 32)  

* 28P/Neujmin 1

Now it is 17.0 mag (May 18, ATLAS-MLO, Mauna Loa). 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)  
May  30  14 12.69  -32  6.4   2.495   3.399   148   17.4  21:39 (  0, 23)  
June  6  14  7.57  -31 35.1   2.490   3.345   141   17.5  21:06 (  0, 23)  

* 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   1 59.77   67 57.5   6.835   6.255    51   17.5   3:04 (205, 30)  
June  6   2  2.28   68 22.9   6.801   6.240    52   17.5   3:01 (206, 32)  

* 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)  
May  30  10 29.94   -6 54.8   1.285   1.677    92   17.5  20:50 ( 53, 31)  
June  6  10 39.40   -9 40.7   1.357   1.691    89   17.6  20:56 ( 56, 25)  

* 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)  
May  30  12 38.49   51 57.9   8.792   8.866    90   17.5  20:50 (158, 71)  
June  6  12 37.52   51 10.4   8.876   8.879    86   17.6  20:56 (144, 68)  

* C/2017 K5 ( PanSTARRS )

Now it is 18.4 mag (Apr. 22, W. Hasubick). It stays observable at 18 mag for a long time from 2019 to 2021.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  19  9.41  -18 14.9   6.865   7.690   142   17.6   2:39 (  0, 37)  
June  6  19  6.48  -18 48.3   6.801   7.692   149   17.6   2:09 (  0, 36)  

* 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)  
May  30  21 45.08  -53  4.1   1.733   2.332   113   17.8   3:04 (341, -2)  
June  6  21 55.72  -54 32.9   1.636   2.284   117   17.7   3:01 (343, -3)  

* 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)  
May  30   2 11.09  -68 25.9   3.454   3.660    93   17.7   3:04 (333,-35)  
June  6   2 32.41  -70 29.5   3.475   3.729    96   17.8   3:01 (336,-35)  

* 117P/Helin-Roman-Alu 1

Now it is 17.7 mag (Apr. 14, Y. Sugiyama). 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)  
May  30  10 16.40   19 40.8   4.426   4.370    80   17.8  20:50 ( 82, 46)  
June  6  10 19.84   19  7.9   4.515   4.356    74   17.8  20:56 ( 86, 40)  

* A/2019 O3

Now it is 17.2 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)  
May  30  19 53.10   28 11.0   8.576   8.969   109   17.9   3:04 (329, 82)  
June  6  19 50.26   28 54.8   8.506   8.962   113   17.9   2:52 (  0, 84)  

* C/2019 K6 ( PanSTARRS )

Now it is 17.9 mag (Apr. 30, Mt. Lemmon Survey). It will be fading after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  13 25.25  -18 19.3   3.127   3.930   137   17.9  20:51 (  0, 37)  
June  6  13 14.02  -18  9.4   3.226   3.931   127   18.0  20:56 ( 13, 36)  

* P/2020 G1 ( Pimentel )

Now it is 17.1 mag (May 23, Charles S. Morris). It approached to Sun down to 0.5 a.u. in March, and it must have brightened up to 14 mag. It is fading very rapidly. But it may be somewhat brighter than this ephemeris.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  10 16.16   -6  3.7   1.055   1.456    89   18.7  20:50 ( 56, 30)  
June  6  10 42.36   -6 41.9   1.189   1.553    89   19.3  20:56 ( 57, 28)  

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