Weekly Information about Bright Comets (2015 May 30: North)

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 Updated on June 1, 2015
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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/2015 G2 ( MASTER )

It brightened up to 6.0 mag in mid May (May 14, Chris Wyatt). It will be fading after this. But it is bright as 6.6 mag still now (May 26, Marco Goiato). In the Southern Hemisphere, it keeps observable in good condition until late June. In the Northern Hemisphere, it keeps unobservable until September when the comet will be fainter than 13 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   7  7.00   -7  1.4   0.864   0.789    48    7.2  20:50 ( 86, -6)  
June  6   7 31.85   -1 18.3   1.107   0.821    45    7.9  20:56 ( 92, -5)

* C/2014 Q2 ( Lovejoy )

It brightened up to 3.7 mag and became a naked eye comet in mid January (Jan. 13, Marek Biely). Now it is fading. But it is bright as 8.2 mag still now (May 31, Neil Norman). In the Northern Hemisphere, it keeps observable all night until July when the comet will fade down to 10 mag. Then it keeps observable for a long time until the comet fades out. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  20  9.82   89  2.0   2.291   2.145    68    8.2   3:05 (180, 36)  
June  6  15 15.15   86 27.1   2.338   2.219    70    8.4  22:09 (180, 39)

* C/2014 Q1 ( PanSTARRS )

Now it is 10.7 mag (May 26, Michael Mattiazzo), fainter than originally predicted. It will approach to the sun down to 0.3 a.u. in July, and it was expected to brighten up to 3 mag. But actually, it will be 6 mag at best. In the Southern Hemisphere, it is observable in the extremely low sky until early June. Then it becomes unobservable temporarily, but it will be observable after mid July, and keeps observable while the comet will be fading gradually. It will not be observable after this in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   2 31.95   18  5.5   1.806   1.011    26   10.3   3:05 (247, -1)  
June  6   3  2.47   22 23.8   1.662   0.868    25    9.6   3:01 (243,  0)

* 88P/Howell

Now it is bright as 9.9 mag (May 24, Marco Goiato). In the Southern Hemisphere, it keeps observable in good condition for a long time until the comet fades out. In the Northern Hemisphere, it will be getting higher gradually after this, and will be observable in good condition while the comet will be fading gradually. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   0 36.97   -0  8.2   1.705   1.480    59    9.9   3:05 (278, 11)  
June  6   0 53.82    1 35.3   1.696   1.511    61   10.1   3:01 (278, 14)

* 19P/Borrelly

It brightened up to 12.8 mag until March (Mar. 21, Michael Mattiazzo). It will brighten up to 10.5 mag in May and June, but it is not observable. In the Northern Hemisphere, it will be observable after autumn while the comet will be fading. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   4 32.13   20 14.7   2.361   1.349     2   10.6  20:50 (133,-18)  
June  6   4 55.26   22 34.9   2.367   1.352     0   10.6  20:56 (136,-18)

* C/2013 US10 ( Catalina )

Now it is 12.3 mag (May 14, Chris Wyatt). It is expected to brighten up to 5 mag from autumn to winter. It keeps observable in excellent condition until autumn in the Southern Hemisphere. In the Northern Hemisphere, it is hardly observable until December. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  23 50.28  -25 26.6   2.742   2.781    81   11.2   3:05 (305,  4)  
June  6  23 53.38  -26 54.1   2.535   2.695    87   10.9   3:01 (309,  7)

* 6P/d'Arrest

It will brighten up to 11 mag in April and May. But the condition is bad in this apparition. In the Southern Hemisphere, it is getting higher gradually in the morning sky. It will not be observable until late July in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   2 27.71    2 35.7   2.418   1.682    34   12.0   3:05 (260,-10)  
June  6   2 45.03    3 19.3   2.429   1.726    36   12.3   3:01 (260, -8)

* 22P/Kopff

Now it is 12.7 mag and visible visually (May 15, Uwe Pilz). It will brighten up to 11 mag in 2015 autumn. In this apparition, it is observable until the highlight while the comet is brightening. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  12 21.34    5  4.2   1.478   2.112   114   13.0  20:50 ( 28, 57)  
June  6  12 23.23    4 34.1   1.510   2.071   108   12.8  20:56 ( 39, 53)

* C/2012 F3 ( PanSTARRS )

Now it is 14.3 mag (May 22, Yuji Ohshima). In 2015, it keeps 13-14 mag and will be observable in good condition for a long time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  19 28.40   -8 29.8   2.710   3.492   134   13.1   3:01 (  0, 47)  
June  6  19 28.12   -8 23.2   2.660   3.502   140   13.1   2:33 (  0, 47)

* 29P/Schwassmann-Wachmann 1

Outburst occured on May 6. Now it is bright as 11.3 mag (May 16, Marco Goiato). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  17 45.97  -31 48.1   5.080   6.039   159   13.4   1:19 (  0, 23)  
June  6  17 42.48  -31 46.3   5.048   6.037   165   13.4   0:48 (  0, 23)

* C/2015 F4 ( Jacques )

Now it is 13.5 mag (May 25, Hiroshi Abe). It is expected to brighten up to 12 mag from July to August. In the Southern Hemisphere, it keeps observable in good condition until summer. In the Northern Hemisphere, it will be getting higher gradually after May, and will be observable in good condition after summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  20 56.50  -26  6.6   1.197   1.903   118   13.7   3:05 (339, 26)  
June  6  20 56.79  -22  1.9   1.088   1.859   124   13.4   3:01 (344, 31)

* 67P/Churyumov-Gerasimenko

Now it is 15.5 mag (May 29, A. Maury, J.-F. Soulier, J.-G. Bosch, T. Noel). It will brighten up to 11 mag from August to October. In the Northern Hemisphere, it will be getting higher gradually after July, then it keeps observable in good condition. In the Southern Hemisphere, it keeps low until November. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   1 52.57    7 44.3   2.177   1.534    39   14.1   3:05 (261,  0)  
June  6   2 13.90    9 56.3   2.110   1.489    40   13.8   3:01 (259,  2)

* C/2014 W11 ( PanSTARRS )

It brightened very rapidly. Now it is so bright as 13.8 mag and visible visually (May 11, Sandor Szabo). It keeps 14-15 mag for a while after this. In the Northern Hemisphere, it will be getting lower gradually after May, and will be unobservable in mid June. In the Southern Hemisphere, it will be getting lower gradually after June, and will be unobservable in early August. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   9 21.87    6 56.3   3.591   3.430    72   14.3  20:50 ( 77, 29)  
June  6   9 28.92    6 20.4   3.677   3.428    67   14.3  20:56 ( 81, 23)

* C/2015 C2 ( SWAN )

It brightened up to 9.2 mag in March (Mar. 9, Juan Jose Gonzalez). Now it is fading. It has already faded down to 14.8 mag (May 26, Hiroshisa Sato). In the Northern Hemisphere, it will be getting higher gradually after this. It is not observable after this in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   2  1.64   65 31.4   2.191   1.718    49   14.7   3:05 (208, 29)  
June  6   2  9.12   70  4.3   2.231   1.817    53   15.0   3:01 (204, 32)

* C/2015 F2 ( Polonia )

It approached to the earth, and brightened up to 12.0 mag from April to May (Apr. 24, Taras Prystavski). Now it is fading, but it is bright as 14.5 mag still now (May 25, Hiroshi Abe). it will be fainter than 18 mag in late July. It is observable in excellent condition for a while. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  22  1.41    7 32.6   0.769   1.301    92   14.7   3:05 (300, 46)  
June  6  22  7.60   13 21.7   0.792   1.343    95   15.1   3:01 (298, 53)

* C/2012 K1 ( PanSTARRS )

It brightened up to 6.9 mag in 2014 autumn (Oct. 17, Marco Goiato). Now it is fading. It has already faded down to 14.8 mag (May 22, C. W. Hergenrother). In the Southern Hemisphere, it keeps observable in good condition until the comet fades out. It will be observable again in mid June also in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   0 55.39  -17  1.6   4.205   3.875    64   14.8   3:05 (289, -2)  
June  6   0 55.56  -17 21.0   4.167   3.948    70   14.9   3:01 (293,  2)

* C/2011 KP36 ( Spacewatch )

Now it is 15.2 mag (May 25, Hiroshi Abe). Distant object, but it keeps observable at 14-15 mag for a long time from 2015 to 2016. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  21 29.65   -0 59.3   5.214   5.535   103   15.0   3:05 (316, 45)  
June  6  21 30.94   -0 47.8   5.091   5.512   109   14.9   3:01 (323, 48)

* 205P/Giacobini

Now it is 17.1 mag (Apr. 27, Hidetaka Sato). First return of a comet re-discovered after 112-year blank in 2008. It brightened up to 12 mag in 2008. In this apparition, it was expected to brighten up to 15 mag from spring to summer, but it is fainter than predicted. It keeps locating low in the morning sky for a while. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   0 53.84    9 13.8   1.944   1.546    52   15.3   3:05 (268, 13)  
June  6   1 13.60   10 18.6   1.919   1.555    53   15.3   3:01 (268, 15)

* 57P/du Toit-Neujmin-Delporte

Now it is 17.0 mag (May 24, C. Rinner, F. Kugel, J. Nicolas). It is expected to brighten up to 15 mag in summer, and will be observable in excellent condition. However, it is fainter than this ephemeris recently. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  22 56.05   -3 43.5   1.507   1.730    84   15.4   3:05 (298, 29)  
June  6  23 10.13   -2 15.9   1.458   1.734    87   15.3   3:01 (299, 31)

* C/2014 N3 ( NEOWISE )

Now it is 15.3 mag (Jan. 7, Taras Prystavski). It keeps 15 mag for a long time from 2014 to 2015. It is observable in excellent condition in 2014 in the Southern Hemisphere, or in 2015 in the Northern Hemisphere. It will be getting higher gradually in the morning sky. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   1 52.29   17 29.4   4.713   3.941    36   15.3   3:05 (253,  6)  
June  6   1 57.25   19  0.1   4.657   3.952    41   15.3   3:01 (254, 11)

* C/2014 A4 ( SONEAR )

Now it is 15.8 mag (Feb. 22, Taras Prystavski). It will brighten up to 14 mag from 2015 to 2016. In the Southern Hemisphere, it becomes unobservable temporarily from April to May, but it will be observable in good condition again after June. It will be observable in good condition after July also in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   3  7.38    3 37.0   5.149   4.262    26   15.4   3:05 (253,-17)  
June  6   3  9.37    4 25.3   5.087   4.251    31   15.3   3:01 (256,-12)

* C/2013 X1 ( PanSTARRS )

Now it is 15.1 mag (Apr. 17, Taras Prystavski). It will pass close to the earth from spring to summer in 2016, and it is expected to be observable at 6-7 mag in good condition. It is not observable now. In the Northern Hemispehre, it will appear in the morning sky in late July, then it keeps observable in excellent condition until winter. In the Southern Hemisphere, it will be observable after mid August, but it keeps very low until winter. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   5  3.48   33 29.5   5.263   4.289    14   15.4  20:50 (136, -4)  
June  6   5  7.15   33 35.4   5.211   4.221    11   15.3  20:56 (141, -8)

* 51P/Harrington

Now it is 16.4 mag (May 28, A. Maury, J.-G. Bosch, J.-F. Soulier). It will be observable at 13 mag in good condition from summer to autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  23 18.61   -9 21.9   1.702   1.844    81   15.6   3:05 (298, 21)  
June  6  23 34.43   -8  5.6   1.623   1.820    83   15.4   3:01 (299, 23)

* C/2010 S1 ( LINEAR )

Now it is 16.0 mag (May 26, Yasukazu Ikari). It is observable at 15-16 mag in good condition in 2015. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  18 36.51  -21  5.2   6.912   7.802   149   15.6   2:09 (  0, 34)  
June  6  18 31.69  -21 29.9   6.886   7.832   157   15.6   1:37 (  0, 34)

* C/2006 S3 ( LONEOS )

It brightened up to 11-12 mag in 2012. It has already faded down to 15.5 mag (May 11, Sandor Szabo). It keeps observable at 15 mag in good condition until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  10 57.84   -4 24.7   9.335   9.549    99   15.6  20:50 ( 48, 38)  
June  6  10 56.88   -4 12.8   9.492   9.587    92   15.7  20:56 ( 56, 33)

* 7P/Pons-Winnecke

It must have brightened up to 11 mag from January to February, but no observations have been reported. Now it is 15.6 mag (Apr. 24, Taras Prystavski). In the Southern Hemisphere, it is observable in the morning sky after this while the comet will be fading. In the Northern Hemisphere, it will be getting higher after July, but the comet will be faitner than 17 mag. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   1 20.25  -10 40.8   2.221   1.851    55   15.8   3:05 (280, -4)  
June  6   1 33.71  -10  9.4   2.218   1.904    58   16.0   3:01 (282, -1)

* 218P/LINEAR

Now it is bright as 13.9 mag and visible visually (May 14, Chris Wyatt). In this apparition, it turns to approach to the sun down to 1.17 a.u., and it was expected to brighten up to 13 mag from March to May. But actually, it brightened up to 14-15 mag at best. It will be fading after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  21 24.32   -8  5.5   0.504   1.257   107   16.0   3:05 (323, 40)  
June  6  21 34.18   -7 17.5   0.511   1.291   111   16.2   3:01 (327, 42)

* C/2015 F5 ( SWAN-Xingming )

It brightened up to 8.2 mag in April (Apr. 8, Juan Jose Gonzalez). Now it is fading rapidly. It was visible visually at 13.2 mag on May 11 (Sandor Szabo). However, it is reported so faint as 18.0 mag on May 20 (A. Diepvens). In the Northern Hemisphere, it is getting lower gradually in the evening sky. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   7 59.44   36 33.7   1.908   1.450    48   16.0  20:50 (117, 27)  
June  6   8 10.80   34 51.7   2.122   1.568    44   16.6  20:56 (118, 22)

* 117P/Helin-Roman-Alu 1

It brightened up to 13 mag in 2014. Now it is 15.5 mag (Jan. 3, Ken-ichi Kadota). It will be fading slowly after this. It is observable at 16 mag in excellent condition from summer to winter in 2015. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   0 58.87   -0 51.2   4.125   3.642    55   16.2   3:05 (275,  6)  
June  6   1  5.37   -0 14.8   4.056   3.657    60   16.2   3:01 (278, 10)

* 32P/Comas Sola

It brightened up to 13 mag in winter. Now it is fading. It has already faded down to 15.9 mag (May 20, Hiroshi Abe). It keeps observable in good condition for a while. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  11 26.85   13  1.1   2.421   2.768    99   16.2  20:50 ( 56, 56)  
June  6  11 32.06   11 54.6   2.545   2.805    94   16.4  20:56 ( 63, 50)

* 44P/Reinmuth 2

It brightened up to 16.4 mag in 2014 (Nov. 14, J. F. Hernandez). It will be observable at 16 mag again from summer to autumn in 2015. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   1 35.31   14 45.0   2.844   2.180    40   16.3   3:05 (257,  8)  
June  6   1 48.93   16  7.7   2.807   2.193    43   16.3   3:01 (258, 11)

* C/2013 A1 ( Siding Spring )

It brightened up to 9 mag from autumn to winter in 2014. Now it is fading rapidly. It has already faded down to 14.8 mag (May 26, Yasukazu Ikari). In the Northern Hemisphere, it will be observable in excellent condition after this while the comet will be fading. In the Southern Hemisphere, it is hardly observable after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  13 29.22   54 28.1   2.906   3.161    95   16.3  20:57 (180, 71)  
June  6  13 13.96   52 59.2   3.056   3.232    90   16.6  20:56 (161, 71)

* 318P/2014 M6 ( McNaught-Hartley )

First return of a periodic comet discovered in 1994. Now it is 16.9 mag (May 25, MASTER-SAAO Observatory, Sutherland). It will brighten up to 15 mag from summer to autumn, and will be 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  22 27.68  -32  3.8   2.393   2.768   100   16.5   3:05 (323, 11)  
June  6  22 35.89  -32  8.0   2.290   2.741   105   16.4   3:01 (326, 13)

* C/2013 V2 ( Borisov )

Now it is 16.1 mag (May 20, Hiroshi Abe). In the Northern Hemisphere, it keeps 15-16 mag and observable in excellent condition until early summer. It locates somewhat low in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  12 40.22   25 30.1   3.645   4.072   107   16.4  20:50 ( 44, 77)  
June  6  12 40.24   24  4.3   3.759   4.103   102   16.5  20:56 ( 60, 71)

* 221P/LINEAR

Now it is 15.8 mag (May 26, Catalina Sky Survey). It will brighten rapidly, and will be observable at 16.5 mag in good condition from May to July. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  16 27.09  -13 29.7   0.791   1.800   171   16.5   0:00 (  0, 41)  
June  6  16 24.48  -11 51.9   0.784   1.788   167   16.5  23:26 (  0, 43)

* 319P/2015 G1 ( Catalina-McNaught )

First return of a periodic comet discovered in 2008. Now it is 17.2 mag (May 19, Catalina Sky Survey). It will approach to the earth from spring to summer, and brighten rapidly. It will brighten up to 16 mag, and will be observable in good condition. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  22 33.35   -5 50.3   0.756   1.267    90   16.7   3:05 (305, 31)  
June  6  23  5.97   -5 25.3   0.727   1.241    89   16.5   3:01 (302, 30)

* 10P/Tempel 2

Now it is 16.4 mag (May 22, J. Gonzalez). It keeps observable after this while the comet will be getting brighter graudually. It will brighten up to 11 mag from autumn to winter. But it locates low at that time. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  14  3.86    7 42.5   1.323   2.159   134   16.9  21:33 (  0, 63)  
June  6  13 59.45    7 16.7   1.334   2.115   127   16.6  21:01 (  0, 62)

* 299P/2014 D2 ( Catalina-PanSTARRS )

Now it is 17.7 mag (Feb. 17, K. Hills). It keeps observable at 17 mag from spring to summer. It locates somewhat low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  17  3.78  -27 24.0   2.176   3.178   169   16.7   0:37 (  0, 28)  
June  6  16 58.81  -26 57.3   2.171   3.184   175   16.7   0:05 (  0, 28)

* C/2011 J2 ( LINEAR )

Getting observable again in the morning sky. It is fading, but it is observable at 17 mag in good condition until late autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  23 48.53   12 59.9   6.052   5.717    66   16.8   3:05 (274, 29)  
June  6  23 48.99   12 51.0   5.984   5.762    72   16.8   3:01 (278, 33)

* 61P/Shajn-Schaldach

Now it is 17.5 mag (Apr. 27, Hidetaka Sato). It will be observable at 15 mag in good condition in autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   0 11.48    1 33.8   2.558   2.317    64   16.9   3:05 (281, 17)  
June  6   0 23.45    2 37.5   2.468   2.296    68   16.8   3:01 (282, 20)

* C/2015 K1 ( MASTER )

Now it is 15.8 mag (May 18, MASTER-SAAO Observatory, Sutherland). It keeps observable in good condition until the comet fades out. In 2014, it must have been observable at 14 mag in good condition in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   0 30.72   -5  6.2   3.827   3.491    63   16.8   3:05 (283, 10)  
June  6   0 35.80   -4  9.5   3.784   3.539    68   16.9   3:01 (285, 14)

* C/2012 X1 ( LINEAR )

It brightened rapidly in outburst in mid October in 2013, then it keeps bright as 8-10 mag for a long time until 2014 summer. Now it is fading. It has already faded down to 15.8 mag (Feb. 9, Taras Prystavski). In the Southern Hemisphere, it keeps observable in good condition for a long time after this until the comet fades out. It is not observable in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   1 23.54  -32 20.4   5.669   5.394    69   16.9   3:05 (298,-16)  
June  6   1 28.54  -32 40.7   5.650   5.455    73   17.0   3:01 (301,-13)

* C/2014 R1 ( Borisov )

It brightened up to 10.6 mag from autumn to winter (Nov. 29, Seiichi Yoshida). Now it is fading. It has already faded down to 16.7 mag (May 26, Hiroshi Abe). It keeps observable for a long time until the comet fades out. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  17  9.86  -15 20.8   1.900   2.898   167   16.9   0:43 (  0, 40)  
June  6  17  3.09  -15 33.2   1.962   2.971   172   17.2   0:09 (  0, 39)

* C/2015 H1 ( Bressi )

Now it is 16.5 mag (May 1, R. A. Mastaler, A. F. Tubbiolo). It keeps 17 mag until summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  20  6.23   24 43.2   1.499   2.066   109   17.0   3:05 (322, 77)  
June  6  19 33.19   28 30.2   1.442   2.097   116   17.0   2:39 (  0, 83)

* 141P/Machholz 2

Now it is 19 mag (May 24, WISE). It will brighten very rapidly, and it is expected to brighten up to 11 mag from summer to autumn. In the Northern Hemisphere, it keeps observable in good condition in the morning sky. It keeps locating extremely low from summer to autumn. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  22 18.16    3 37.2   1.127   1.520    90   17.7   3:05 (300, 41)  
June  6  22 40.22    7 21.6   1.020   1.443    90   17.1   3:01 (297, 43)

* P/2015 F1 ( PanSTARRS )

Now it is 16.1 mag (May 27, Catalina Sky Survey). It keeps 17 mag until July. 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  16 24.98  -23 49.9   1.564   2.578   177   17.1  23:54 (  0, 31)  
June  6  16 19.50  -23 44.8   1.576   2.584   171   17.1  23:21 (  0, 31)

* C/2013 G9 ( Tenagra )

Now it is 16.3 mag (Apr. 19, Catalina Sky Survey). It keeps 17 mag for a long time from 2014 to 2016. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  10 45.77  -16  9.6   5.154   5.431   100   17.1  20:50 ( 42, 27)  
June  6  10 42.72  -15 38.3   5.286   5.441    93   17.2  20:56 ( 50, 22)

* 53P/Van Biesbroeck

Now it is 17.3 mag (May 22, K. Hills). It will brighten up to 14 mag and will be observable in good condition in 2016. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  12 28.73    3 36.5   2.949   3.525   116   17.2  20:50 ( 24, 56)  
June  6  12 29.03    3 28.9   3.006   3.491   110   17.2  20:56 ( 37, 53)

* C/2015 F3 ( SWAN )

It brightened up to 9.5 mag from March to April (Apr. 7, Juan Jose Gonzalez). Now it is fading and getting diffuse rapidly. It was visible visually at 13.5 mag on May 10 (Uwe Pilz). However, it is reported so faint as 19.1 mag on May 28 (C. Rinner, F. Kugel, J. Nicolas). It seems to be a fragment of Comets C/1988 A1 (Liller) and C/1996 Q1 (Tabur). 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  11 45.04   46 14.2   1.339   1.641    87   17.2  20:50 (128, 69)  
June  6  11 52.11   39  5.6   1.471   1.734    86   18.4  20:56 (107, 66)

* C/2014 AA52 ( Catalina )

It brightened up to 15.3 mag in winter (Jan. 17, Taras Prystavski). Now it is fading. It is observable in good condition in the Southern Hemisphere. It will be observable in good condition after June also in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   0 53.98  -19 39.5   2.497   2.284    66   17.4   3:05 (291, -4)  
June  6   0 50.60  -18 47.2   2.420   2.324    72   17.4   3:01 (295,  2)

* C/2012 K8 ( Lemmon )

Now it is 17.4 mag (Apr. 14, A. Klotz, F. Kugel, J. Nicolas, C. Rinner). It keeps observable at 17-18 mag for a long time from 2013 to 2016. It keeps locating high in the Northern Hemisphere. It keeps locating very low in the Southern Hemipshere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  15 23.28   65 53.0   6.634   6.740    91   17.4  22:51 (180, 59)  
June  6  15  9.03   65 40.1   6.686   6.754    89   17.4  22:09 (180, 59)

* P/2009 L2 ( Yang-Gao )

First return of a new periodic comet which brightened up to 12 mag in 2009. It seems to brighten up to 17 mag in summer. It is observable in good condition in the Southern Hemisphere. In the Northern Hemisphere, it keeps locating extremely low after June. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30   9 51.57   -6 17.5   1.410   1.657    84   17.5  20:50 ( 60, 26)  
June  6  10  5.36   -6 21.7   1.426   1.621    81   17.4  20:56 ( 64, 22)

* C/2013 G3 ( PanSTARRS )

Now it is 17.9 mag (Mar. 21, W. Hasubick). It was observed at 17 mag in 2014 summer. In the Northern Hemisphere, it is observable at 17.5 mag in excellent condition also in 2015. It is not observable in the Southern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  22 10.22   50  4.4   4.343   4.212    75   17.4   3:05 (230, 58)  
June  6  22 14.28   51  1.0   4.319   4.236    78   17.4   3:01 (226, 61)

* C/2013 C2 ( Tenagra )

Very far object. However, outburst occured on Feb. 20, and it brightened up to 15 mag. It was reported so bright visually as 11.8 mag (Mar. 11, Marco Goiato). However, it has already faded down to 17.8 mag (May 16, K. Hills). It locates high in the Southern Hemisphere. But it locates somewhat low in the Northern Hemisphere. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  12  0.80  -20 18.2   8.607   9.138   118   17.8  20:50 ( 22, 32)  
June  6  12  1.08  -20  1.7   8.701   9.137   112   17.8  20:56 ( 30, 29)

* 174P/(60558) 2000 EC98 ( Echeclus )

Now it is 17.7 mag (May 10, A. Maury, J.-F. Soulier). It has brightened in outburst up to 14 mag twice, in 2006 January and 2011 May. It is around the perihelion now. It keeps observable at 17 mag for a long time after this. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  23 19.11   -3 17.3   5.932   5.820    78   17.8   3:05 (293, 25)  
June  6  23 21.92   -3  1.0   5.826   5.821    84   17.8   3:01 (297, 29)

* 40P/Vaisala 1

It brightened up to 15.5 mag from autumn to winter (Nov. 25, Taras Prystavski). Now it is fading. It has already faded down to 17.8 mag (May 20, A. Diepvens). It keeps observable in good condition for a while. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  17 42.98   -8 15.1   1.640   2.603   156   17.8   1:16 (  0, 47)  
June  6  17 37.20   -8 28.3   1.661   2.646   162   17.9   0:43 (  0, 47)

* 220P/McNaught

Now it is 19.2 mag (Mar. 22, iTelescope Observatory, Siding Spring). It will be observable at 17.5 mag in good condition in summer. 

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
May  30  23 54.62    0 41.2   1.603   1.561    69   17.9   3:05 (284, 20)  
June  6   0 13.77    2  7.7   1.560   1.556    70   17.8   3:01 (284, 22)

* P/2012 B1 ( PanSTARRS )

It had been observed at 15 mag for a long time from 2013 to 2014. Now it is fading. It will be observable at 18 mag in good condition from spring to summer. 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 33.35  -30  4.3   4.404   5.194   137   17.9   3:05 (  0, 25)  
June  6  19 31.00  -30 18.9   4.358   5.215   144   18.0   2:36 (  0, 25)

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