Weekly Information about Bright Comets (2015 Oct. 10: North)

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Updated on October 17, 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/2013 US10 ( Catalina )

Now it is 6.5 mag (Oct. 13, Marco Goiato). It was expected to brighten up to 4-5 mag from autumn to winter. However, the brightness evolution has stopped in September. It will become unobservable soon also in the Southern Hemisphere. In the Northern Hemisphere, it keeps unobservable until late November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  14 33.54  -34 21.7   1.710   1.067    35    6.6  18:56 ( 58,-15)  
Oct. 17  14 30.97  -31 21.0   1.770   0.992    27    6.5  18:47 ( 63,-17)  

* C/2014 S2 ( PanSTARRS )

It brightened very rapidly. Now it is so bright as 9.7 mag (Oct. 11, Seiichi Yoshida). It is observable at 9-10 mag until next spring 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)  
Oct. 10  17  7.63   88  8.9   1.888   2.219    95    9.8  18:56 (178, 36)  
Oct. 17  16 19.78   84  2.1   1.875   2.194    94    9.7  18:47 (173, 38)  

* 22P/Kopff

Now it is very bright as 9.5 mag (Oct. 14, Marco Goiato). In the Northern Hemisphere, it keeps very low in the evening until mid December. It will be getting lower gradually after this even in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  16 15.27  -19 35.6   2.022   1.566    49   10.9  18:56 ( 55, 12)  
Oct. 17  16 36.88  -20 41.3   2.049   1.560    47   10.9  18:47 ( 54, 12)  

* 10P/Tempel 2

It brightened very rapidly. Now it is very bright as 11.1 mag (Oct. 9, Chris Wyatt). It keeps 11-13 mag until February. But it keeps very low in the Northern Hemisphere. It will be getting lower gradually after this even in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  16 49.43  -20 47.3   1.738   1.466    57   11.6  18:56 ( 48, 17)  
Oct. 17  17 11.09  -22  9.9   1.756   1.449    55   11.5  18:47 ( 47, 16)  

* C/2014 Q2 ( Lovejoy )

It brightened up to 3.7 mag and became a naked eye comet in mid January in 2015 (Jan. 13, Marek Biely). Now it is fading. But it is bright as 11.4 mag still now (Oct. 5, Katsumi Yoshimoto). 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)  
Oct. 10  16 25.59   31 17.0   3.909   3.550    61   11.7  18:56 (102, 43)  
Oct. 17  16 33.25   29 33.1   4.027   3.622    59   11.9  18:47 (101, 41)  

* C/2013 X1 ( PanSTARRS )

Now it is bright as 11.8 mag (Oct. 15, Juan Jose Gonzalez). 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 keeps observable in excellent condition until winter. In the Southern Hemisphere, it keeps very low until winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   5 19.62   42 19.3   2.399   2.933   112   12.1   4:08 (180, 83)  
Oct. 17   5  5.36   43 26.4   2.211   2.859   121   11.8   3:27 (180, 82)  

* 67P/Churyumov-Gerasimenko

Now it is bright as 11.7 mag (Oct. 15, Juan Jose Gonzalez). It keeps bright as 11-12 mag from August to October. In the Northern Hemisphere, it is getting higher gradually, and it keeps observable in good condition after this. In the Southern Hemisphere, it keeps low until November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   9 53.20   17 59.4   1.805   1.427    52   12.2   4:37 (271, 34)  
Oct. 17  10 12.07   16 41.2   1.808   1.469    54   12.3   4:42 (274, 36)  

* C/2015 F4 ( Jacques )

It brightened rapidly up to 10.4 mag from July to August (July 18, Maik Meyer). Now it is fading, but it is bright as 13.2 mag still now (Oct. 11, Seiichi Yoshida). It is observable in good condition in the Northern Hemisphere. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  19  8.82   45 40.8   1.425   1.825    96   13.0  18:56 (137, 74)  
Oct. 17  19 19.77   45 53.3   1.486   1.867    95   13.2  18:47 (135, 73)  

* 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 fading. It has already faded down to 12.9 mag (Oct. 3, Chris Wyatt). 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)  
Oct. 10  14 39.93  -48 30.0   2.571   2.030    47   13.0  18:56 ( 45,-21)  
Oct. 17  15  0.60  -49 51.1   2.717   2.139    45   13.4  18:47 ( 43,-21)  

* C/2014 W2 ( PanSTARRS )

Now it is bright as 12.8 mag (Oct. 15, Juan Jose Gonzalez). 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)  
Oct. 10   7 28.34   66 57.5   2.886   3.104    93   13.9   4:37 (197, 55)  
Oct. 17   7 44.33   70  3.6   2.786   3.068    96   13.8   4:42 (192, 53)  

* 29P/Schwassmann-Wachmann 1

Outburst occured on Sept. 22. It is bright as 12.5 mag still now (Oct. 4, Thomas Lehmann).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  17 31.76  -29  1.0   6.307   6.000    67   13.8  18:56 ( 35, 16)  
Oct. 17  17 35.97  -28 54.8   6.405   5.998    61   13.9  18:47 ( 38, 14)  

* 19P/Borrelly

Now it is 12.8 mag (Sept. 21, Hiroshi Abe). In the Northern Hemisphere, it is appearing in the morning sky. It keeps observable after this while the comet will be fading. It is not observable in the Southern Hemisphere until January when the comet will fade down to 16 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  11 38.87   25 21.8   2.693   1.993    37   14.0   4:37 (250, 16)  
Oct. 17  11 54.82   24 28.9   2.702   2.043    40   14.2   4:42 (253, 19)  

* C/2014 A4 ( SONEAR )

Now it is 15.1 mag (Sept. 13, Taras Prystavski). 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)  
Oct. 10   1 56.80   14 43.1   3.222   4.190   163   14.3   0:46 (  0, 70)  
Oct. 17   1 43.73   14 54.2   3.204   4.195   172   14.3   0:06 (  0, 70)  

* C/2015 G2 ( MASTER )

It brightened up to 6.0 mag in mid May (May 14, Chris Wyatt). Now it is fading. It has already faded down to 14.5 mag (Oct. 11, Seiichi Yoshida). In the Northern Hemisphere, it keeps observable in good condition after this while the comet will be fading. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   8 38.33   22 44.0   2.564   2.415    70   14.4   4:37 (277, 51)  
Oct. 17   8 34.63   23 59.3   2.511   2.504    78   14.5   4:42 (282, 59)  

* C/2011 KP36 ( Spacewatch )

Now it is 14.4 mag (Sept. 20, Yasukazu Ikari). 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)  
Oct. 10  21  9.96   -6 14.8   4.568   5.159   121   14.4  19:55 (  0, 49)  
Oct. 17  21 10.91   -6 38.6   4.646   5.143   114   14.4  19:29 (  0, 48)  

* 141P/Machholz 2

It brightened rapidly in mid August, and brightened up to 10.8 mag (Sept. 13, Sandor Szabo). Secondary component H also brightened up to 14.8 mag (Sept. 13, Thomas Lehmann). Now it is 13.1 mag (Oct. 13, Thomas Lehmann). It will fade out very rapidly after this. In the Northern Hemisphere, it keeps observable in good condition in the morning sky. In the Southern Hemisphere, it keeps locating extremely low from summer to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   9 56.97    6  4.8   1.454   1.067    47   14.5   4:37 (282, 26)  
Oct. 17  10 13.33    3 27.8   1.503   1.142    49   15.2   4:42 (287, 28)  

* 88P/Howell

It is fading, but bright as 12.7 mag still now (Sept. 17, Uwe Pilz). 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)  
Oct. 10   2 36.27   11 45.3   1.343   2.289   155   14.6   1:25 (  0, 67)  
Oct. 17   2 28.45   11 20.0   1.360   2.335   164   14.9   0:50 (  0, 66)  

* 116P/Wild 4

Appearing in the morning sky in the Northern Hemisphere. It will be observable after December in the Southern Hemisphere. It is expected to brighten up to 13 mag from winter to spring. It will be observable in excellent condition 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)  
Oct. 10  11 33.87    4 36.9   3.159   2.284    24   15.0   4:37 (268,  6)  
Oct. 17  11 47.24    3  6.1   3.110   2.270    27   14.9   4:42 (273,  9)  

* 318P/2014 M6 ( McNaught-Hartley )

First return of a periodic comet discovered in 1994. It brightened up to 13.8 mag from summer to autumn (Sept. 7, Taras Prystavski). Now it is fading, but it is bright as 15.1 mag still now (Oct. 2, Katsumi Yoshimoto). 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)  
Oct. 10  22 32.31  -30 53.9   1.699   2.451   128   15.0  21:18 (  0, 24)  
Oct. 17  22 32.55  -29 23.7   1.754   2.449   123   15.1  20:50 (  0, 26)  

* C/2014 N3 ( NEOWISE )

Now it is 14.4 mag (Sept. 13, Taras Prystavski). 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)  
Oct. 10   1 40.69   45 21.5   3.476   4.289   139   15.0   0:30 (180, 80)  
Oct. 17   1 31.19   46  4.7   3.478   4.315   142   15.1  23:48 (180, 79)  

* 205P/Giacobini

It was so faint as 20.0 mag in August (Aug. 17, Hidetaka Sato). However, it brightened by 6 mag in outburst in mid September. Now it is 15.6 mag (Oct. 2, Katsumi Yoshimoto). It keeps observable in excellent condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   4 54.49    4 46.7   1.423   2.124   121   15.1   3:43 (  0, 60)  
Oct. 17   4 53.54    3 30.9   1.405   2.167   128   15.3   3:14 (  0, 59)  

* 61P/Shajn-Schaldach

Now it is 14.6 mag (Sept. 18, Katsumi Yoshimoto). It keeps observable at 15 mag in good condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   2 32.03    6 47.3   1.159   2.115   157   15.2   1:21 (  0, 62)  
Oct. 17   2 29.19    6  2.0   1.141   2.117   163   15.2   0:50 (  0, 61)  

* C/2012 F3 ( PanSTARRS )

Now it is 14.7 mag (Sept. 6, Sandor Szabo). 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)  
Oct. 10  19 28.71  -14 19.0   3.631   3.856    95   15.3  18:56 ( 13, 40)  
Oct. 17  19 34.16  -14 30.5   3.757   3.884    89   15.4  18:47 ( 17, 39)  

* C/2013 V4 ( Catalina )

Now it is 14.9 mag (Sept. 13, Sandor Szabo). 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)  
Oct. 10   5 37.86   63 42.6   4.842   5.185   104   15.6   4:27 (180, 61)  
Oct. 17   5 36.52   65 16.9   4.770   5.186   109   15.5   3:58 (180, 60)  

* 117P/Helin-Roman-Alu 1

It brightened up to 13 mag in 2014. Now it is 15.2 mag (Sept. 12, Sandor Szabo). 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)  
Oct. 10   1 19.81    0  8.5   2.945   3.937   171   16.1   0:09 (  0, 55)  
Oct. 17   1 15.19   -0  9.6   2.966   3.952   170   16.1  23:32 (  0, 55)  

* 44P/Reinmuth 2

It brightened up to 16.4 mag in 2014 (Nov. 14, J. F. Hernandez). Now it is 17.2 mag (Aug. 27, D. Buczynski). 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)  
Oct. 10   4 26.08   28 30.7   1.858   2.581   126   16.1   3:14 (  0, 84)  
Oct. 17   4 24.51   28 31.7   1.818   2.608   133   16.1   2:45 (  0, 84)  

* 230P/LINEAR

Now it is 16.7mag (Sept. 26, C. Bell). 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)  
Oct. 10   4 40.45   -8 33.8   0.750   1.541   122   16.3   3:28 (  0, 46)  
Oct. 17   4 50.39   -9  5.0   0.707   1.523   125   16.1   3:11 (  0, 46)  

* 81P/Wild 2

Now it is 18.0 mag (Sept. 24, Jean-Gabriel Bosch). It will brighten up to 11 mag from spring to summer in 2016. In the Northern Hemisphere, it keeps observable in good condition while the comet will be brightening. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   5 59.21   19 57.8   2.473   2.916   106   16.3   4:37 (351, 75)  
Oct. 17   6  2.49   19 51.5   2.344   2.876   112   16.1   4:23 (  0, 75)  

* C/2014 W5 ( Lemmon-PanSTARRS )

No observations have been reported after November in 2014. Current brightness is uncertain. It must keep 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)  
Oct. 10   1 46.64  -34  0.8   2.075   2.897   138   16.2   0:36 (  0, 21)  
Oct. 17   1 22.40  -37  4.2   2.081   2.864   133   16.2  23:37 (  0, 18)  

* P/2010 V1 ( Ikeya-Murakami )

First return of a periodic comet which brightened up to 8 mag in major outburst in 2010. It will be observable in excellent condition from winter to spring. Now it is not detected, fainter than 20 mag (Oct. 2, Jean-Francois Soulier).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   7 53.17   30 55.8   1.904   2.021    81   16.7   4:37 (270, 64)  
Oct. 17   8  8.99   30 41.1   1.799   1.985    85   16.2   4:42 (273, 67)  

* 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 15.7 mag (Oct. 2, Katsumi Yoshimoto). 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)  
Oct. 10  23  2.33  -29  9.7   4.455   5.205   134   16.2  21:47 (  0, 26)  
Oct. 17  22 55.71  -29  4.0   4.605   5.272   127   16.3  21:13 (  0, 26)  

* 329P/2015 T1 ( LINEAR-Catalina )

First return of a periodic comet discovered in 2003. Now it is 18.1 mag (Oct. 11, J.-F. Soulier). It will approach to the earth from autumn to winter, and it is expected to brighten up to 15 mag and observable in excellent condition. But actually, it is somewhat fainter than this ephemeris.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   4 45.05   -6 55.4   1.024   1.771   122   16.5   3:33 (  0, 48)  
Oct. 17   4 51.09   -6 29.9   0.958   1.746   126   16.3   3:11 (  0, 49)  

* C/2010 S1 ( LINEAR )

Now it is 15.8 mag (Sept. 15, Taras Prystavski). It will be unobservable in mid November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  17 34.91  -26 57.0   8.713   8.395    68   16.6  18:56 ( 36, 18)  
Oct. 17  17 35.69  -27 10.3   8.856   8.427    61   16.6  18:47 ( 39, 16)  

* 57P/du Toit-Neujmin-Delporte

Now it is 15.5 mag (Sept. 20, Michael Jager). It keeps observable in good condition for a while. But it will be fading after this, and will be fainter than 18 mag in November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   0  6.41    0 43.9   1.150   2.132   165   16.6  22:51 (  0, 56)  
Oct. 17   0  3.22    0  9.1   1.211   2.166   157   16.8  22:20 (  0, 55)  

* 151P/Helin

Now it is 16.8 mag (Sept. 20, Michael Jager). It will be fading after this. It will be fainter than 18 mag at the end of 2015.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  23 28.49   -8 20.6   1.542   2.474   152   16.8  22:13 (  0, 47)  
Oct. 17  23 27.40   -8 34.1   1.586   2.475   145   16.8  21:45 (  0, 47)  

* P/2015 Q1 ( Scotti )

Now it is 16.5 mag (Sept. 24, J. V. Scotti). It is observable at 17 mag in excellent condition in autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   5 58.51    4 48.3   1.221   1.774   105   16.9   4:37 (355, 60)  
Oct. 17   6  6.96    2 16.6   1.182   1.785   109   16.9   4:27 (  0, 57)  

* 118P/Shoemaker-Levy 4

Now it is 17.7 mag (Sept. 24, Jean-Gabriel Bosch). It will brighten up to 14 mag in 2016 summer. But it is not observable at the highlight. It keeps observable until March while the comet will be brightening gradually up to 15-16 mag.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   0 33.90   -5 18.6   1.729   2.711   166   17.2  23:18 (  0, 50)  
Oct. 17   0 28.76   -6  6.1   1.725   2.680   159   17.1  22:46 (  0, 49)  

* C/2011 J2 ( LINEAR )

Now it is 15.5 mag (Sept. 6, Sandor Szabo). It is fading, but it is a bit brighter than this ephemeris. 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)  
Oct. 10  22 47.13   -0  1.7   5.727   6.582   146   17.1  21:32 (  0, 55)  
Oct. 17  22 43.61   -0 55.4   5.848   6.628   138   17.2  21:01 (  0, 54)  

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

Now it is 16.5 mag (Sept. 8, Jean-Francois 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)  
Oct. 10  23  6.90   -5 25.3   4.992   5.874   149   17.3  21:52 (  0, 50)  
Oct. 17  23  5.34   -5 38.7   5.060   5.879   142   17.3  21:23 (  0, 49)  

* 162P/Siding Spring

Now it is 16.3 mag (Sept. 27, E. Bryssinck). It is observable in good condition in the Northern Hemisphere. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   9 25.17   39 49.5   1.698   1.608    67   17.3   4:37 (247, 48)  
Oct. 17   9 45.12   40  2.3   1.695   1.656    70   17.4   4:42 (247, 50)  

* 74P/Smirnova-Chernykh

Now it is 18.8 mag (Sept. 24, A. Maury, J.-F. Soulier, T. Noel, J.-G. Bosch). Now it is near the aphelion. It is observable at 17 mag in good condition from autumn to winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   3 52.37   16 27.6   3.546   4.326   136   17.5   2:41 (  0, 72)  
Oct. 17   3 49.83   16 21.1   3.471   4.318   144   17.4   2:11 (  0, 71)  

* C/2015 B2 ( PanSTARRS )

It keeps 16.5 mag for a long time in 2016, and it will be observable in excellent condition in the Southern Hemisphere. It is hardly observable in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   9  2.74  -37 24.4   4.258   3.888    61   17.5   4:37 (323,  5)  
Oct. 17   9  2.75  -39 33.6   4.160   3.857    65   17.5   4:42 (330,  7)  

* 50P/Arend

Now it is 16.7 mag (Sept. 19, J. Gonzalez). 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)  
Oct. 10  22 37.03   -9 33.0   1.328   2.197   141   17.5  21:22 (  0, 46)  
Oct. 17  22 33.23   -8 29.8   1.357   2.169   133   17.5  20:51 (  0, 47)  

* C/2015 K1 ( MASTER )

Now it is 15.8 mag (Sept. 18, Catalina Sky Survey). 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)  
Oct. 10   0 12.74    2 33.4   3.453   4.434   167   17.7  22:57 (  0, 58)  
Oct. 17   0  8.42    2 36.3   3.538   4.486   159   17.8  22:25 (  0, 58)  

* 328P/2015 S1 ( LONEOS-Tucker )

First return of a periodic comet discovered in 1998. Now it is 17.9 mag (Oct. 3, J. V. Scotti). It will be observable at 17.5 mag from autumn to winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  20 58.05  -18 47.9   1.367   2.009   115   17.8  19:44 (  0, 36)  
Oct. 17  21  1.98  -17  8.5   1.415   1.988   109   17.7  19:20 (  0, 38)  

* C/2014 B1 ( Schwartz )

It keeps 17.5 mag for a long time from 2016 to 2019. It keeps locating near by the equator.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   8 11.10    0 11.8  10.579  10.318    72   17.8   4:37 (309, 42)  
Oct. 17   8 12.67   -0  0.2  10.459  10.304    78   17.7   4:42 (318, 47)  

* C/2010 U3 ( Boattini )

It will pass the perihelion in 2019. However, it has not been brightening since the discovery in 2010. Now it is 17.9 mag (Sept. 11, E. Bryssinck). It keeps observable in excellent condition from autumn to next spring in the Northern Hemisphere. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   3 48.44   46 32.6  10.436  11.051   125   17.8   2:37 (180, 78)  
Oct. 17   3 46.15   46 51.4  10.337  11.026   131   17.8   2:07 (180, 78)  

* C/2013 G3 ( PanSTARRS )

Now it is 17.8 mag (Sept. 11, A. Diepvens). It keeps 17.5 mag for a long time from 2014 to 2015. It is observable in excellent condition in the Northern Hemisphere. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  21 46.73   45 45.8   4.162   4.777   122   17.9  20:32 (180, 79)  
Oct. 17  21 47.42   44 11.2   4.217   4.811   121   17.9  20:05 (180, 81)  

* 320P/2015 HC10 ( McNaught )

It was expected to approach to the earth down to 0.2 a.u. and brighten up to 15 mag from August to September. But actually, it is so faint as 19.0 mag, much fainter than predicted (Oct. 1, Michael Jager).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10  22  2.65    4 21.3   0.397   1.313   135   20.6  20:50 (  0, 59)  
Oct. 17  22 25.53    4 58.0   0.474   1.374   135   21.1  20:45 (  0, 60)  

* 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 19.3 mag (Aug. 26, W. Hasubick). The fragment D and B are also observed as 19.0 mag (Sept. 20, Michael Jager) and 20.9 mag (Aug. 21, Pan-STARRS 1, Haleakala) respectively.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct. 10   2 21.38    3 14.3   0.820   1.790   159   23.9   1:10 (  0, 58)  
Oct. 17   2 17.38    3 16.5   0.829   1.812   165   24.7   0:39 (  0, 58)  

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