Weekly Information about Bright Comets (2015 July 18: South)

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Updated on July 20, 2015
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Southern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* C/2014 Q1 ( PanSTARRS )

It approached to the sun down to 0.3 a.u. on July 6, and brighted up to 3.9 mag (July 6, Thomas Lehmann). Now it is 5.2 mag (July 16, Paul Camilleri). In the Northern Hemisphere, it keeps observable until the comet fades out. 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)  
July 18   9 16.35   13 23.4   1.184   0.462    22    6.0  18:37 (109,  5)  
July 25   9 58.15    2 15.7   1.197   0.610    30    7.1  18:40 (101, 13)  

* C/2013 US10 ( Catalina )

Now it is bright as 9.0 mag (July 14, Marco Goiato). 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 will be unobservable soon, and it keeps unobservable until late November after that.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  23 41.42  -48 34.7   1.399   2.162   126    8.7   4:01 (  0, 77)  
July 25  23 22.68  -55 39.4   1.266   2.070   129    8.3   3:15 (  0, 70)  

* 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 9.5 mag still now (July 11, Gabor Santa). In the Northern Hemisphere, 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)  
July 18  14 60.00   64 54.1   2.680   2.667    78    9.5  19:16 (180,-10)  
July 25  15  6.01   61 20.9   2.755   2.741    78    9.7  18:55 (180, -6)  

* C/2015 F4 ( Jacques )

It brightened rapidly. Now it is so bright as 10.7 mag (July 14, Juan Jose Gonzalez). It keeps 11 mag until August. It is observale in good condition in the Northern Hemisphere, but it will be getting lower gradually in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  20  7.19   17  2.4   0.755   1.674   141   10.9   0:28 (180, 38)  
July 25  19 51.86   23 46.0   0.771   1.659   136   10.9  23:39 (180, 31)  

* C/2015 G2 ( MASTER )

It brightened up to 6.0 mag in mid May (May 14, Chris Wyatt). Now it is fading. It has faded down to 9.0 mag in late June (June 21, Marco Goiato). It is not observable now. In the Southern Hemisphere, it will be observable again after September, but the comet will be fainter than 13 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   8 18.53   12  2.0   2.260   1.283    11   11.4  18:37 (100, -7)  
July 25   8 22.63   13  5.4   2.380   1.378     6   11.8  18:40 ( 97,-13)  

* 88P/Howell

Now it is bright as 10.5 mag (July 12, Gabor Santa). It will be fading after this. It keeps observable in good condition until winter when the comet becomes fainter than 18 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   2 15.92    9 23.1   1.601   1.741    79   11.5   5:35 (200, 43)  
July 25   2 25.99   10 14.0   1.576   1.784    84   11.8   5:32 (195, 43)  

* 19P/Borrelly

It brightened up to 12.8 mag until March (Mar. 21, Michael Mattiazzo). It must have brightened up to 10.5 mag in May and June, but it was 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)  
July 18   7 23.73   31 12.4   2.451   1.468    11   11.6   5:35 (244,-19)  
July 25   7 48.81   31 39.7   2.472   1.501    13   11.9   5:32 (244,-19)  

* 22P/Kopff

Now it is 11.8 mag (July 10, Gabor Santa). It will brighten up to 11 mag 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)  
July 18  13  3.30   -1 29.4   1.717   1.842    80   12.0  18:37 (148, 52)  
July 25  13 14.09   -2 53.2   1.747   1.808    76   11.9  18:40 (140, 51)  

* 67P/Churyumov-Gerasimenko

Now it is 13.6 mag (July 18, Alan Hale). It will brighten up to 12 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)  
July 18   4 43.38   21 22.1   1.831   1.284    42   13.2   5:35 (229, 15)  
July 25   5 11.43   22 35.5   1.807   1.265    42   13.0   5:32 (229, 14)  

* C/2012 F3 ( PanSTARRS )

Now it is 12.9 mag (July 11, Gabor Santa). 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)  
July 18  19 15.95   -9 23.7   2.589   3.584   166   13.1  23:32 (180, 64)  
July 25  19 13.60   -9 48.1   2.621   3.601   162   13.2  23:02 (180, 65)  

* 29P/Schwassmann-Wachmann 1

It brightened up to 13.4 mag in outburst on July 11 (John Drummond).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  17 21.95  -31  0.1   5.155   6.025   146   13.4  21:38 (180, 86)  
July 25  17 19.62  -30 48.4   5.218   6.023   139   13.4  21:08 (180, 86)  

* 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. In the Northern Hemispehre, it will be getting higher gradually in the morning sky, 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)  
July 18   5 30.25   34 42.8   4.615   3.802    32   14.6   5:35 (227, -2)  
July 25   5 33.77   35  0.3   4.471   3.731    38   14.5   5:32 (224,  1)  

* C/2011 KP36 ( Spacewatch )

Now it is 14.1 mag and visible visually (July 10, Jakub Cerny). 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)  
July 18  21 28.50   -0 53.9   4.492   5.382   148   14.6   1:48 (180, 56)  
July 25  21 26.64   -1  9.0   4.427   5.361   154   14.5   1:19 (180, 56)  

* 10P/Tempel 2

Now it is 16.7 mag (July 10, 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)  
July 18  14  5.88    0 29.3   1.482   1.857    94   14.9  18:37 (174, 55)  
July 25  14 12.38   -1  7.9   1.510   1.816    89   14.6  18:40 (163, 55)  

* C/2014 W11 ( PanSTARRS )

It brightened very rapidly, and brightened up to 13.8 mag (May 11, Sandor Szabo). It is not observable already in the Northern Hemisphere. It will be unobservable in early August also in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  10 17.78    1 44.4   4.129   3.435    41   14.7  18:37 (109, 23)  
July 25  10 26.65    0 49.3   4.190   3.438    37   14.7  18:40 (105, 19)  

* 6P/d'Arrest

Now it is 13.6 mag (June 27, Chris Wyatt). It is getting higher gradually in the morning sky. However, it will be fading rapidly, and will be fainter than 18 mag in late August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   4 15.03    5 18.0   2.436   2.010    53   14.8   5:35 (235, 32)  
July 25   4 27.52    5 14.7   2.425   2.059    57   15.3   5:32 (233, 34)  

* C/2014 A4 ( SONEAR )

Now it is 16.5 mag (July 10, A. Maury, J.-G. Bosch, T. Noel). It will brighten up to 14 mag from 2015 to 2016. It keeps observable in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   3 14.78    8 42.4   4.501   4.201    66   15.0   5:35 (218, 38)  
July 25   3 13.89    9 20.7   4.376   4.196    73   14.9   5:32 (211, 40)  

* C/2014 S2 ( PanSTARRS )

Now it is bright as 15.3 mag (July 17, S. Shurpakov). It is expected to brighten up to 15 mag from autum to next spring, and to be observable in excellent condition in the Northern Hemisphere. It keeps unobservable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   2 17.04   42 23.8   2.843   2.682    70   15.3   5:35 (191, 11)  
July 25   2 24.20   45 33.8   2.718   2.635    74   15.1   5:32 (188,  9)  

* C/2014 N3 ( NEOWISE )

Now it is 14.8 mag (June 24, iTelescope Observatory, Siding Spring). It keeps 15 mag for a long time from 2014 to 2015. It is observable in excellent condition in the Northern Hemisphere. It locates low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   2 19.93   28 15.6   4.209   4.036    73   15.2   5:35 (196, 25)  
July 25   2 21.93   29 50.8   4.124   4.053    78   15.2   5:32 (190, 24)  

* 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 15.9 mag (June 3, K. Hills). In the Southern Hemisphere, it keeps observable in good condition until the comet fades out. In the Northern Hemisphere, it keeps observable until winter, but it locates somewhat low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   0 40.94  -21 21.9   3.893   4.381   112   15.2   5:00 (180, 76)  
July 25   0 35.40  -22 18.6   3.860   4.452   119   15.2   4:27 (180, 77)  

* 57P/du Toit-Neujmin-Delporte

Now it is 14.6 mag and visible visually (July 12, Jakub Cerny). It will be observable in excellent condition at 14-15 mag in summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   0 15.72    4 26.1   1.191   1.805   109   15.2   4:35 (180, 50)  
July 25   0 22.45    5  2.4   1.153   1.825   114   15.2   4:14 (180, 50)  

* 318P/2014 M6 ( McNaught-Hartley )

First return of a periodic comet discovered in 1994. Now it is 16.0 mag (June 27, iTelescope Observatory, Siding Spring). 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)  
July 18  23  5.88  -34  5.8   1.780   2.596   134   15.5   3:25 (180, 89)  
July 25  23  6.74  -34 35.7   1.718   2.576   139   15.3   2:59 (180, 89)  

* C/2014 W2 ( PanSTARRS )

It keeps 13 mag for a long time from 2015 autumn to 2016 summer. In the Northern Hemispehre, it keeps observable in good condition for a long time. It keeps unobservable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   5 23.49   42 32.3   4.362   3.600    36   15.5   5:35 (221, -6)  
July 25   5 31.96   43 54.0   4.250   3.555    41   15.4   5:32 (218, -5)  

* 141P/Machholz 2

It was reported so bright as 14.6 mag visually (July 11, Jakub Cerny). However, it is so faint as 16.9 mag by CCD observations (July 18, Klotz, F. Kugel, C. Rinner, J. Nicolas). It was expected to brighten rapidly up to 11 mag from summer to autumn. But actually, maybe it brightens up to 15 mag at best. 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)  
July 18   2 40.10   35  3.1   0.688   0.986    67   16.1   5:35 (198, 17)  
July 25   3 40.32   36 46.1   0.704   0.920    61   15.8   5:32 (204, 13)  

* C/2010 S1 ( LINEAR )

Now it is 16.0 mag (May 26, Yasukazu Ikari). It is observable at 15-16 mag in good condition until autumn. It locates somewhat low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  18  0.75  -23 48.1   7.082   8.016   155   15.8  22:17 (180, 79)  
July 25  17 56.11  -24  7.9   7.172   8.047   147   15.9  21:45 (180, 79)  

* 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 will be unobservable in early August also in the Southern Hemisphere. But it will be observable at 16 mag in good condition again from winter to next spring.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  10 57.50   -3 48.0  10.392   9.812    52   15.9  18:37 (112, 34)  
July 25  10 58.43   -3 50.9  10.521   9.850    46   16.0  18:40 (106, 28)  

* C/2013 V4 ( Catalina )

It keeps 15-16 mag for a long time until 2016. It keeps observable in excellent condition in the Northern Hemisphere. It keeps unobservable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   4 45.62   47 26.9   5.893   5.222    44   16.0   5:35 (213, -5)  
July 25   4 52.14   48 33.9   5.816   5.216    49   16.0   5:32 (210, -4)  

* 117P/Helin-Roman-Alu 1

It brightened up to 13 mag in 2014. Now it is 16.7 mag (June 3, Taras Prystavski). 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)  
July 18   1 34.81    2  8.1   3.572   3.750    92   16.1   5:35 (188, 53)  
July 25   1 37.67    2 17.8   3.487   3.765    98   16.1   5:29 (180, 53)  

* 61P/Shajn-Schaldach

Now it is 16.7 mag (July 18, Space Surveillance Telescope, Atom Site). 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)  
July 18   1 31.31    7 50.5   1.928   2.193    90   16.2   5:35 (185, 47)  
July 25   1 41.46    8 25.8   1.842   2.180    94   16.1   5:32 (180, 47)  

* 44P/Reinmuth 2

It brightened up to 16.4 mag in 2014 (Nov. 14, J. F. Hernandez). Now it is 17.5 mag (June 28, B. Lutkenhoner, M. Kumrucu-Lohmiller, P. Cox). It will be observable at 16 mag again from summer to autumn in 2015. However, it is fainter than this ephemeris recently.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   3  5.72   22 53.4   2.538   2.294    64   16.2   5:35 (208, 27)  
July 25   3 17.23   23 44.8   2.485   2.314    68   16.2   5:32 (205, 27)  

* 319P/2015 G1 ( Catalina-McNaught )

First return of a periodic comet discovered in 2008. Now it is 16.8 mag (June 21, J. Nicolas, C. Rinner, F. Kugel, A. Klotz). 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)  
July 18   2  5.67   -4 37.0   0.713   1.215    87   16.4   5:35 (203, 57)  
July 25   2 28.50   -4 51.3   0.726   1.233    88   16.5   5:32 (203, 58)  

* 320P/2015 HC10 ( McNaught )

Now it is 19 mag (June 13, WISE). It is expected to brighten rapidly up to 15 mag in August. It is observable in good condition in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere until August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  12 40.16   -9 45.4   0.429   1.019    78   16.8  18:37 (132, 56)  
July 25  12 58.82  -10 10.9   0.389   0.996    75   16.4  18:40 (128, 55)  

* C/2011 J2 ( LINEAR )

Now it is 16.4 mag (June 12, Takaaki Oribe). It is fading, but it is observable at 17 mag in good condition until late autumn. The fragments B and C are already fainter than 20 mag (June 12, Takaaki Oribe).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  23 40.85   10 43.6   5.542   6.033   114   16.8   4:00 (180, 44)  
July 25  23 37.61   10  7.1   5.481   6.079   121   16.8   3:29 (180, 45)  

* 221P/LINEAR

Now it is 16.7 mag (June 12, Mitsunori Tsumura). It is 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)  
July 18  16 29.27   -6 38.9   0.924   1.759   130   16.8  20:46 (180, 62)  
July 25  16 35.18   -6 37.7   0.970   1.763   125   16.9  20:25 (180, 62)  

* 325P/2015 J4 ( Yang-Gao )

First return of a new periodic comet which brightened up to 12 mag in 2009. Now it is 18.3 mag (June 10, Hidetaka Sato), fainter than this ephemeris by 1 mag. It will be 17-18 mag at best in this apparition. 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)  
July 18  11 51.40   -9 26.4   1.518   1.464    67   16.9  18:37 (118, 48)  
July 25  12 12.37  -10 16.2   1.535   1.450    65   16.9  18:40 (115, 47)  

* 218P/LINEAR

It brightened up to 13.9 mag in May (May 14, Chris Wyatt). Now it is fading. It has already faded down to 16.1 mag (July 11, J. Aledo). It will be fainter than 18 mag soon.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  21 33.50   -8 33.9   0.587   1.557   151   16.9   1:53 (180, 63)  
July 25  21 26.42   -9 34.3   0.616   1.609   159   17.2   1:19 (180, 64)  

* 299P/2014 D2 ( Catalina-PanSTARRS )

Now it is 16.2 mag (June 21, Space Surveillance Telescope, Atom Site). 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)  
July 18  16 37.72  -24  2.9   2.413   3.226   136   17.0  20:54 (180, 79)  
July 25  16 37.26  -23 39.8   2.491   3.234   129   17.1  20:26 (180, 79)  

* C/2015 K1 ( MASTER )

Now it is 16.5 mag (June 3, Taras Prystavski). 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)  
July 18   0 52.47    0 10.4   3.465   3.819   102   17.0   5:11 (180, 55)  
July 25   0 52.60    0 39.8   3.415   3.869   109   17.0   4:44 (180, 54)  

* 7P/Pons-Winnecke

It must have brightened up to 11 mag from January to February, but no observations have been reported. Now it is 16.9 mag (July 9, A. Maury, J.-G. Bosch, T. Noel). It will be fainter than 18 mag in late August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   2 35.61   -9 34.9   2.121   2.227    82   17.1   5:35 (220, 59)  
July 25   2 42.45   -9 56.3   2.094   2.280    87   17.3   5:32 (213, 61)  

* C/2014 AA52 ( Catalina )

It brightened up to 15.3 mag in winter (Jan. 17, Taras Prystavski). Now it is fading. It has already faded down to 17.8 mag (June 3, Taras Prystavski). It keeps observable in good condition for a while. But it will be fainter than 18 mag in September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  23 55.74  -15 11.5   1.930   2.603   121   17.2   4:15 (180, 70)  
July 25  23 39.13  -14 42.7   1.873   2.655   131   17.2   3:31 (180, 70)  

* 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 17.9 mag (July 9, A. Diepvens). It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  14 15.20   83 41.3   2.542   2.389    69   17.3  18:37 (180,-28)  
July 25  14 32.36   79 41.7   2.612   2.480    71   17.5  18:40 (179,-24)  

* P/2015 F1 ( PanSTARRS )

It brightened up to 15.3 mag in June (June 21, Space Surveillance Telescope, Atom Site). Now it is fading. It has already faded down to 17.1 mag (July 4, K. Hills). It will be fainter than 18 mag in August. 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)  
July 18  16  4.02  -23 22.9   1.880   2.637   128   17.4  20:21 (180, 78)  
July 25  16  5.67  -23 26.8   1.961   2.648   122   17.5  19:55 (180, 78)  

* 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)  
July 18  23 29.43   -2 24.4   5.218   5.832   122   17.5   3:49 (180, 57)  
July 25  23 29.01   -2 29.4   5.133   5.834   129   17.4   3:21 (180, 57)  

* C/2013 G3 ( PanSTARRS )

Now it is 17.4 mag (June 14, A. Diepvens). 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)  
July 18  22 19.28   54 51.9   4.150   4.397    97   17.5   2:39 (180,  0)  
July 25  22 16.96   55  3.8   4.123   4.426   100   17.5   2:09 (180,  0)  

* 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 rapidly. It has already faded down to 17.9 mag (July 1, W. Hasubick). 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)  
July 18  21 58.74   35 14.7   0.991   1.698   115   17.6   2:18 (180, 20)  
July 25  21 50.98   36 38.3   1.034   1.768   119   18.0   1:43 (180, 18)  

* 205P/Giacobini

Now it is 17.0 mag (June 20, iTelescope Observatory, Siding Spring). 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)  
July 18   3  3.11   13 40.9   1.774   1.676    67   17.6   5:35 (212, 35)  
July 25   3 19.08   13 40.8   1.748   1.706    70   17.7   5:32 (210, 36)  

* 220P/McNaught

Now it is 17.2 mag (June 13, 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)  
July 18   2  1.04    8 31.9   1.338   1.589    83   17.7   5:35 (196, 45)  
July 25   2 16.73    9  5.2   1.305   1.605    86   17.7   5:32 (193, 45)  

* 230P/LINEAR

Now it is 18 mag (July 16, WISE). It is expected to brighten rapidly, and to be observable at 14.5 mag in good condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   1 49.74   -4 48.5   1.628   1.937    91   17.9   5:35 (196, 59)  
July 25   2  4.49   -4 33.6   1.530   1.895    94   17.7   5:32 (192, 59)  

* C/2012 LP26 ( Palomar )

Far object. Now it is 16.7 mag (July 17, J. Jahn). It keeps observable at 18 mag in good condition from summer to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  19 55.03   -2 41.8   5.568   6.539   161   17.9   0:15 (180, 58)  
July 25  19 52.95   -3  2.4   5.562   6.538   162   17.9  23:41 (180, 58)  

* C/2014 W5 ( Lemmon-PanSTARRS )

It keeps 16 mag for a long time from 2015 autumn to 2016 summer. It keeps observable in excellent condition in the Southern Hemisphere. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   3 25.05   -1  0.2   3.626   3.374    67   18.1   5:35 (229, 45)  
July 25   3 25.67   -2 18.5   3.457   3.329    74   17.9   5:32 (223, 49)  

* 51P/Harrington

It brightened up to 15.9 mag in June as predicted (June 23, Ken-ichi Kadota). It was expected to be observable at 13 mag in good condition from summer to autumn. However, Jean-Gabriel Bosch detected the comet became disintegrating in July. Now it is so faint as 18.7 mag (July 13, Jean-Gabriel Bosch). The fragment D was also observed at 21.9 mag in May (May 30, Pan-STARRS 1).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18   1  5.20   -1  5.3   1.217   1.718   100   18.3   5:24 (180, 56)  
July 25   1 18.82   -0  9.5   1.161   1.709   103   18.2   5:10 (180, 55)  

* 50P/Arend

Now it is 18.9 mag (July 13, A. Maury, J.-G. Bosch, T. Noel, J.-F. Soulier). It was expected to brighten rapidly, and to be observable at 16 mag in good condition from summer to winter. But actually, it is much fainter than predicted.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
July 18  23 37.08  -15 13.1   1.871   2.595   125   19.0   3:56 (180, 70)  
July 25  23 37.45  -14 53.1   1.769   2.559   131   18.8   3:29 (180, 70)  

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