Weekly Information about Bright Comets (2018 June 9: North)

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 Updated on June 7, 2018
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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/2016 M1 ( PanSTARRS )

Now it is bright as 8.9 mag (June 4, Chris Wyatt). It stays bright as 9 mag for a while. In the Southern Hemisphere, it stays observable in good condition for a long time until the comet will fade out. In the Northern Hemisphere, it is observable only until June. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  18 58.62  -30 10.0   1.368   2.324   154    9.3   1:52 (  0, 25)  
June 16  18 38.58  -35 34.6   1.313   2.300   161    9.2   1:05 (  0, 20)

* C/2017 T3 ( ATLAS )

Now it is not observable. It will brighten up to 9 mag in summer, but it is hardly observable when it is bright. In the Northern Hemisphere, it is not observable until late December. In the Southern Hemisphere, it is observable from July to September, but it locates in extremely low. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   4  8.65   17 33.6   2.059   1.108    14   11.0   3:00 (238,-13)  
June 16   4 28.65   14 18.7   1.942   1.029    18   10.6   2:58 (241,-14)

* 66P/du Toit

It brightened rapidly as expected. Now it is very bright as 10.7 mag (May 25, Chris Wyatt). It stays at 10-11 mag until June. In the Southern Hemisphere, it stays observable in excellent condition. In the Northern Hemisphere, it will be unobservable from April to June when the comet becomes brightest. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   0 18.08  -28 18.3   0.909   1.320    86   10.9   3:00 (309,  4)  
June 16   0 35.53  -26 13.2   0.915   1.343    87   11.5   2:58 (308,  6)

* C/2016 R2 ( PanSTARRS )

Now it is 11.3 mag (May 15, Juan Jose Gonzalez). It stays bright as 11 mag for a long time until autumn. In the Southern Hemisphere, it is not observable for a long time after this. In the Northern Hemispehre, it stays observable for a long time until the comet fades out. But it stays very low until autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   6 42.37   49 40.6   3.419   2.622    32   11.2  20:58 (142, 14)  
June 16   7  1.14   50 29.9   3.441   2.633    31   11.2  21:02 (144, 13)

* 364P/2018 A2 ( PanSTARRS )

First return of a new periodic comet which brightened up to 13 mag in 2013. Now it is 14.2 mag (June 3, Michael Mattiazzo). It will brighten very rapidly after this, up to 11 mag in summer. In the Southern Hemisphere, it stays observable in good condition all through this apparition. In the Northern Hemisphere, it is not observable at the high light from mid June to mid August. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   8 57.28   15 17.7   0.464   0.836    54   12.7  20:58 ( 96, 18)  
June 16   8 54.00   10  7.9   0.404   0.809    48   12.0  21:02 ( 96,  8)

* 21P/Giacobini-Zinner

Now it is 14.4 mag (May 21, Toshihiko Ikemura, Hirohisa Sato). It will brighten rapidly, and brighten up to 7 mag from August to September. In the Northern Hemisphere, it will be observable in excellent condition. In the Southern Hemisphere, it will be unobservable from July to August. But it will be observable in good condition before and after tha. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  20 42.75   37 36.4   1.067   1.608   101   12.7   3:00 (247, 83)  
June 16  20 55.46   41 31.9   0.993   1.544   100   12.2   2:58 (211, 82)

* C/2016 N6 ( PanSTARRS )

Now it is 11.6 mag (May 15, Juan Jose Gonzalez). It stays 12 mag for a long time until spring in 2019. In the Northern Hemisphere, it stays observable in good condition for a long time, although it becomes unobservable temporarily from mid June to August. In the Southern Hemisphere, it is not observable until September. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   8  1.43   43 20.1   3.381   2.701    41   12.2  20:58 (128, 22)  
June 16   8  5.73   41  0.8   3.447   2.691    35   12.2  21:02 (129, 16)

* 48P/Johnson

Now it is 14.7 mag (May 21, Catalina Sky Survey). It will brighten rapidly after this, and it will brighten up to 11 mag from summer to autumn. 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  9  22  4.57  -15  5.3   1.487   2.068   109   12.6   3:00 (326, 33)  
June 16  22 13.32  -15 20.1   1.411   2.055   114   12.4   2:58 (331, 35)

* 37P/Forbes

Now it is bright as 12.7 mag (May 25, Chris Wyatt). It will be observable at 12-13 mag in good condition from spring to summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  23  2.71   -8  8.3   1.227   1.649    94   13.1   3:00 (308, 30)  
June 16  23 13.47   -6 10.2   1.190   1.665    97   13.1   2:58 (310, 34)

* C/2017 S3 ( PanSTARRS )

It is expected to approach to Sun down to 0.2 a.u. and brighten up to 3 mag in August. Now it is 16.4 mag (May 17, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it stays observable in the morning sky until early August when the comet brightens up to 6 mag. It is not observable at all in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   1 33.90   58 12.2   2.074   1.649    51   13.8   3:00 (219, 34)  
June 16   1 57.80   58 48.4   1.919   1.523    52   13.2   2:58 (218, 34)

* C/2015 O1 ( PanSTARRS )

Now it is very bright as 12.0 mag (May 15, Juan Jose Gonzalez). It will be observable at 12-13 mag for a long time from 2017 to 2018. In the Southern Hemisphere, it will be hardly observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  12 15.83   52 27.1   3.867   3.855    81   13.4  20:58 (139, 63)  
June 16  12  6.26   51  1.1   3.979   3.871    76   13.5  21:02 (132, 58)

* 29P/Schwassmann-Wachmann 1

Now it is 14.8 mag (May 10, Toshihiko Ikemura, Hirohisa Sato). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  23 17.26    0 12.8   5.733   5.781    87   13.5   3:00 (298, 34)  
June 16  23 18.84    0 33.4   5.623   5.780    93   13.5   2:58 (303, 38)

* C/2017 M4 ( ATLAS )

Now it is 14.8 mag (May 14, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 13 mag in 2019 spring. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it locates extremely low until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  18 22.32   46 23.0   3.423   3.870   108   14.5   1:15 (180, 79)  
June 16  18  7.30   45 47.7   3.360   3.835   110   14.5   0:33 (180, 79)

* C/2018 EF9 ( Lemmon )

It brightened very rapidly. Now it is very bright as 11.8 mag (May 16, Juan Jose Gonzalez). It may fade out very rapidly in June. In the Northern Hemisphere, it stays observable until it fades out. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   4 58.63   84  8.8   1.786   1.574    61   14.9   3:00 (185, 31)  
June 16   4 36.79   84 22.3   1.808   1.591    61   17.1   2:58 (186, 32)

* C/2017 B3 ( LINEAR )

Now it is 15.2 mag (May 21, Martin Masek). It stays 15 mag from 2018 to 2019, and it will be observable for a long time in the Southern Hemisphere. 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  9  12  2.15  -66 32.2   3.881   4.425   116   15.1  20:58 ( 12,-14)  
June 16  11 59.40  -66  2.3   3.893   4.398   113   15.1  21:02 ( 16,-16)

* C/2015 V2 ( Johnson )

It brightened up to 7.1 mag from May to June in 2017 (June 21, Juan Jose Gonzalez). Now it is fading. It has already faded down to 14.6 mag (May 14, Thomas Lehmann). In the Southern Hemisphere, it stays observable for a long time after this. It will never be observable again in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   1 42.17  -43 45.9   4.551   4.515    81   15.2   3:00 (310,-19)  
June 16   1 48.23  -44 12.8   4.549   4.579    85   15.2   2:58 (313,-16)

* 49P/Arend-Rigaux

The condition is worst in this apparition. It brightens up to 14.5 mag from June to August, but it is not observable at all. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   4 45.69   13 14.5   2.470   1.486    10   15.4   3:00 (234,-22)  
June 16   5  8.19   14 29.5   2.451   1.467    11   15.2   2:58 (234,-20)

* 64P/Swift-Gehrels

Now it is 20.7 mag (May 25, J. V. Scotti). It will brighten rapidly, and it is expected to brighten up to 10 mag in autumn. But actually, it is much fainter than this ephemeris. It will be observable in excellent condition in the Northern Hemisphere. It stays low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  22 48.71   -4 44.2   1.811   2.169    96   15.8   3:00 (308, 35)  
June 16  22 58.14   -3  9.8   1.687   2.115   100   15.5   2:58 (311, 39)

* 65P/Gunn

Now it is 17.2 mag (May 21, Martin Masek). It is observable at 15 mag in 2018, in good 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  9  23 17.64  -15 16.5   2.899   3.131    93   15.6   3:00 (310, 23)  
June 16  23 22.25  -15 10.6   2.818   3.143    99   15.5   2:58 (314, 26)

* C/2018 C2 ( Lemmon )

It brightened rapidly. Now it is 15.8 mag (May 14, Toshihiko Ikemura, Hirohisa Sato). It stays 15.5 mag until June. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  14 43.45   23 55.1   1.225   1.958   121   15.7  21:32 (  0, 79)  
June 16  14 43.64   19 53.1   1.251   1.964   119   15.8  21:05 (  0, 75)

* C/2015 V1 ( PanSTARRS )

Now it is 17.2 mag (May 19, CAO, San Pedro de Atacama). Fading now. It stays observable in good condition for a long time after this in the Southern Hemisphere. It is not observable until June in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   0 59.87  -10 42.3   4.761   4.502    69   15.9   3:00 (288,  7)  
June 16   1  0.45  -11 44.8   4.658   4.521    75   15.9   2:58 (293, 12)

* (944) Hidalgo

It will brighten up to 14 mag in winter. It will be observable in excellent condition in the Northern Hemisphere. In the Southern Hemisphere, it is observable only until August. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   2 20.42   13 56.1   3.054   2.374    40   16.0   3:00 (257,  5)  
June 16   2 31.10   16  3.8   2.959   2.338    44   15.9   2:58 (257, 10)

* C/2015 VL62 ( Lemmon-Yeung-PanSTARRS )

It is fading now, but it stays 16 mag until summer. But actually, it is 18.1 mag (Mar. 23, Toshihiko Ikemura, Hirohisa Sato), fainter than this ephemeris. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  17 11.77  -28 17.9   2.934   3.945   174   16.0   0:06 (  0, 27)  
June 16  16 55.35  -28 14.1   2.990   3.993   169   16.1  23:15 (  0, 27)

* (3552) Don Quixote

Now it is 15.5 mag (Mar. 16, iTelescope Observatory, Siding Spring). It brightens up to 16 mag in spring. In the Southern Hemisphere, it stays observable until August, but it will be unobservable after that. In the Northern Hemisphere, it stays unobservable until June, but it will be observable in good condition after that. Its cometary activity was observed on Mar. 26 (M. Mommert, D. Polishook, N. Moskovitz). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   1 21.34    1 39.7   1.508   1.309    58   16.1   3:00 (275, 10)  
June 16   1 34.87    5 37.0   1.504   1.340    60   16.1   2:58 (274, 15)

* 38P/Stephan-Oterma

Now it is 16.7 mag (May 13, Hidetaka Sato). It will brighten rapidly after this, and it is expected to brighten up to 9 mag from autumn to winter. In the Northern Hemisphere, it stays observable in good condition for a long time until it fades out. In the Southern Hemispehre, it is observable in good condition until autumn, but it will be low in winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   1 48.11   -5  5.6   2.860   2.444    56   16.5   3:00 (277,  1)  
June 16   2  0.97   -4  0.1   2.742   2.386    59   16.1   2:58 (278,  4)

* C/2017 S6 ( Catalina )

It stays observable at 16.5 mag for a while. It will be observable in good condition after this in the Southern Hemisphere. But it stays low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  22  0.71  -22 36.8   1.444   2.066   113   16.4   3:00 (330, 27)  
June 16  21 37.12  -27 32.4   1.364   2.127   126   16.5   2:58 (344, 26)

* C/2017 K4 ( ATLAS )

Now it is 17.2 mag (May 21, Toshihiko Ikemura, Hirohisa Sato). It was observed at 16 mag from summer to autumn in 2017. It will be observable at 16.5 mag in good condition also in 2018. It locates somewhat low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   0 32.17   17 31.1   3.348   3.047    64   16.5   3:00 (268, 29)  
June 16   0 39.39   18 53.4   3.302   3.081    68   16.5   2:58 (270, 34)

* 105P/Singer Brewster

Unexpectedly, it brightened rapidly. Now it is 16.6 mag (May 15, Toshihiko Ikemura, Hirohisa Sato). It stays at 16.5 mag until July. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  12 32.66    1 33.4   1.538   2.100   108   16.5  20:58 ( 39, 50)  
June 16  12 39.26    1 11.6   1.596   2.088   103   16.5  21:02 ( 46, 46)

* 74P/Smirnova-Chernykh

Now it is 15.9 mag (May 4, Kunihiro Shima). It will be fading slowly until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  11 29.06   10 32.9   3.405   3.567    90   16.6  20:58 ( 66, 46)  
June 16  11 32.98    9 52.9   3.507   3.571    85   16.7  21:02 ( 71, 40)

* C/2014 B1 ( Schwartz )

Now it is 16.6 mag (May 10, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  10 23.60    9 18.9   9.864   9.675    76   16.9  20:58 ( 77, 33)  
June 16  10 25.61    9 17.4   9.979   9.682    70   16.9  21:02 ( 82, 27)

* C/2017 E3 ( PanSTARRS )

Now it is 16.9 mag (May 15, Toshihiko Ikemura, Hirohisa Sato). It will be fainter than 18 mag in summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  14 31.26   -6  6.2   5.673   6.472   138   16.9  21:20 (  0, 49)  
June 16  14 29.47   -5 26.7   5.773   6.492   131   16.9  21:02 (  4, 49)

* C/2018 A3 ( ATLAS )

Now it is 16.7 mag (May 10, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15 mag in January, 2019. It stays observable in excellent condition in the Northern Hemispehre. It is observable only until June in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  10 28.58   34 56.5   4.092   3.856    69   16.9  20:58 (106, 45)  
June 16  10 26.70   34 59.1   4.173   3.823    63   16.9  21:02 (109, 39)

* C/2014 OE4 ( PanSTARRS )

Now it is 16.8 mag (May 15, Toshihiko Ikemura, Hirohisa Sato). It will be fading gradually after this, and it will be fainter than 18 mag in winter. In the Northern Hemisphere, it stays observable in good condition for a long time. 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  9  23 30.92   72  8.0   7.604   7.259    66   17.0   3:00 (199, 45)  
June 16  23 36.57   72 52.2   7.606   7.282    67   17.0   2:58 (197, 46)

* C/2017 M5 ( TOTAS )

Now it is 18.0 mag (May 15, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 17 mag in good condition from spring to autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9  21  2.24    1 22.8   5.446   5.990   117   17.1   3:00 (336, 54)  
June 16  21  2.12    1 39.5   5.361   5.990   124   17.1   2:58 (347, 56)

* 2018 EN4

Now it is bright as 18.0 mag (May 14, Hidetaka Sato). Hidetaka Sato pointed out its cometary activity. In the Northern Hemisphere, it stays observable at 18 mag until June. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June  9   8  0.49   45 25.9   2.042   1.450    41   17.9  20:58 (130, 23)  
June 16   8 17.64   47 46.5   2.074   1.454    40   18.0  21:02 (134, 22)

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