Weekly Information about Bright Comets (2015 Oct. 17: 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. 17  14 30.97  -31 21.0   1.770   0.992    27    6.5  18:47 ( 63,-17)  
Oct. 24  14 28.69  -28 29.9   1.808   0.927    19    6.4  18:39 ( 68,-20)  

* 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. 17  16 19.78   84  2.1   1.875   2.194    94    9.7  18:47 (173, 38)  
Oct. 24  16 17.16   80  8.5   1.871   2.172    93    9.6  18:39 (168, 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. 17  16 36.88  -20 41.3   2.049   1.560    47   10.9  18:47 ( 54, 12)  
Oct. 24  16 59.11  -21 36.6   2.078   1.558    45   10.9  18:39 ( 53, 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. 17  17 11.09  -22  9.9   1.756   1.449    55   11.5  18:47 ( 47, 16)  
Oct. 24  17 33.83  -23 20.9   1.774   1.435    53   11.3  18:39 ( 45, 16)  

* 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. 17   5  5.36   43 26.4   2.211   2.859   121   11.8   3:27 (180, 82)  
Oct. 24   4 46.15   44 28.9   2.036   2.784   130   11.5   2:40 (180, 81)  

* 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. 17  16 33.25   29 33.1   4.027   3.622    59   11.9  18:47 (101, 41)  
Oct. 24  16 40.90   27 58.9   4.142   3.693    56   12.0  18:39 (100, 37)  

* 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. 17  10 12.07   16 41.2   1.808   1.469    54   12.3   4:42 (274, 36)  
Oct. 24  10 29.68   15 23.7   1.808   1.513    56   12.4   4:48 (278, 38)  

* 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. 17  19 19.77   45 53.3   1.486   1.867    95   13.2  18:47 (135, 73)  
Oct. 24  19 32.53   46  4.0   1.548   1.911    94   13.5  18:39 (134, 72)  

* 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. 17  15  0.60  -49 51.1   2.717   2.139    45   13.4  18:47 ( 43,-21)  
Oct. 24  15 20.83  -51  0.4   2.860   2.245    43   13.7  18:39 ( 42,-22)  

* 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. 17   7 44.33   70  3.6   2.786   3.068    96   13.8   4:42 (192, 53)  
Oct. 24   8  3.56   73 18.7   2.696   3.034   100   13.7   4:48 (188, 51)  

* 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. 17  17 35.97  -28 54.8   6.405   5.998    61   13.9  18:47 ( 38, 14)  
Oct. 24  17 40.56  -28 48.8   6.498   5.996    55   13.9  18:39 ( 41, 12)  

* 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. 17  11 54.82   24 28.9   2.702   2.043    40   14.2   4:42 (253, 19)  
Oct. 24  12 10.01   23 38.8   2.707   2.094    43   14.4   4:48 (256, 22)  

* 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. 17   1 43.73   14 54.2   3.204   4.195   172   14.3   0:06 (  0, 70)  
Oct. 24   1 30.52   15  0.9   3.210   4.200   173   14.3  23:19 (  0, 70)  

* 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. 17  21 10.91   -6 38.6   4.646   5.143   114   14.4  19:29 (  0, 48)  
Oct. 24  21 12.46   -6 59.4   4.730   5.127   108   14.5  19:03 (  0, 48)  

* 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. 17   8 34.63   23 59.3   2.511   2.504    78   14.5   4:42 (282, 59)  
Oct. 24   8 29.34   25 22.5   2.454   2.593    86   14.6   4:48 (289, 68)  

* 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. 17  11 47.24    3  6.1   3.110   2.270    27   14.9   4:42 (273,  9)  
Oct. 24  12  0.60    1 34.7   3.057   2.258    30   14.8   4:48 (277, 12)  

* 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. 17   2 28.45   11 20.0   1.360   2.335   164   14.9   0:50 (  0, 66)  
Oct. 24   2 20.32   10 53.6   1.391   2.381   172   15.2   0:14 (  0, 66)  

* 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. 17  22 32.55  -29 23.7   1.754   2.449   123   15.1  20:50 (  0, 26)  
Oct. 24  22 34.09  -27 46.8   1.817   2.448   118   15.1  20:24 (  0, 27)  

* 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. 17   1 31.19   46  4.7   3.478   4.315   142   15.1  23:48 (180, 79)  
Oct. 24   1 21.50   46 36.1   3.494   4.341   144   15.1  23:10 (180, 78)  

* 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. 17  10 13.33    3 27.8   1.503   1.142    49   15.2   4:42 (287, 28)  
Oct. 24  10 28.11    1  1.2   1.543   1.219    52   15.8   4:48 (292, 30)  

* 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. 17   2 29.19    6  2.0   1.141   2.117   163   15.2   0:50 (  0, 61)  
Oct. 24   2 25.60    5 17.8   1.135   2.121   169   15.2   0:19 (  0, 60)  

* 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. 17   4 53.54    3 30.9   1.405   2.167   128   15.3   3:14 (  0, 59)  
Oct. 24   4 50.89    2 17.4   1.394   2.210   134   15.6   2:44 (  0, 57)  

* 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. 17  19 34.16  -14 30.5   3.757   3.884    89   15.4  18:47 ( 17, 39)  
Oct. 24  19 40.13  -14 38.7   3.884   3.913    84   15.5  18:39 ( 21, 38)  

* C/2014 Y1 ( PanSTARRS )

It will be observable at 14 mag from winter to summer. It will be 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. 17  11 58.73    6 47.9   3.327   2.478    26   15.6   4:42 (268,  9)  
Oct. 24  12 11.70    5  0.8   3.258   2.446    29   15.4   4:48 (272, 12)  

* 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. 17   5 36.52   65 16.9   4.770   5.186   109   15.5   3:58 (180, 60)  
Oct. 24   5 33.38   66 50.2   4.706   5.187   113   15.5   3:27 (180, 58)  

* 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. 17   8  8.99   30 41.1   1.799   1.985    85   16.2   4:42 (273, 67)  
Oct. 24   8 24.70   30 23.0   1.697   1.950    88   15.7   4:48 (278, 71)  

* 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. 17   6  2.49   19 51.5   2.344   2.876   112   16.1   4:23 (  0, 75)  
Oct. 24   6  4.72   19 44.8   2.219   2.836   118   15.9   3:58 (  0, 75)  

* 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. 17   4 50.39   -9  5.0   0.707   1.523   125   16.1   3:11 (  0, 46)  
Oct. 24   4 58.74   -9 25.3   0.669   1.509   129   15.9   2:51 (  0, 46)  

* 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. 17   4 24.51   28 31.7   1.818   2.608   133   16.1   2:45 (  0, 84)  
Oct. 24   4 21.48   28 27.2   1.786   2.635   141   16.1   2:15 (  0, 83)  

* 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. 17   1 15.19   -0  9.6   2.966   3.952   170   16.1  23:32 (  0, 55)  
Oct. 24   1 10.71   -0 24.9   3.001   3.968   164   16.2  23:00 (  0, 55)  

* 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. 17   4 51.09   -6 29.9   0.958   1.746   126   16.3   3:11 (  0, 49)  
Oct. 24   4 55.61   -5 50.3   0.898   1.724   131   16.1   2:48 (  0, 49)  

* 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. 17   1 22.40  -37  4.2   2.081   2.864   133   16.2  23:37 (  0, 18)  
Oct. 24   0 56.89  -39 28.3   2.116   2.833   127   16.2  22:44 (  0, 15)  

* 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. 17  22 55.71  -29  4.0   4.605   5.272   127   16.3  21:13 (  0, 26)  
Oct. 24  22 50.01  -28 52.1   4.765   5.338   120   16.5  20:40 (  0, 26)  

* 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. 17  17 35.69  -27 10.3   8.856   8.427    61   16.6  18:47 ( 39, 16)  
Oct. 24  17 36.81  -27 23.6   8.992   8.459    54   16.7  18:39 ( 43, 13)  

* 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. 17   0  3.22    0  9.1   1.211   2.166   157   16.8  22:20 (  0, 55)  
Oct. 24   0  1.19   -0 16.6   1.282   2.201   150   17.1  21:51 (  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. 17  23 27.40   -8 34.1   1.586   2.475   145   16.8  21:45 (  0, 47)  
Oct. 24  23 27.31   -8 38.7   1.640   2.477   138   16.9  21:17 (  0, 46)  

* 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. 17   6  6.96    2 16.6   1.182   1.785   109   16.9   4:27 (  0, 57)  
Oct. 24   6 13.67   -0 19.7   1.148   1.798   113   16.9   4:06 (  0, 55)  

* 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. 17   0 28.76   -6  6.1   1.725   2.680   159   17.1  22:46 (  0, 49)  
Oct. 24   0 24.08   -6 46.2   1.733   2.650   151   17.0  22:14 (  0, 48)  

* 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. 17  22 43.61   -0 55.4   5.848   6.628   138   17.2  21:01 (  0, 54)  
Oct. 24  22 40.60   -1 45.4   5.983   6.674   130   17.3  20:31 (  0, 53)  

* 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. 17  23  5.34   -5 38.7   5.060   5.879   142   17.3  21:23 (  0, 49)  
Oct. 24  23  4.18   -5 49.3   5.140   5.884   134   17.4  20:54 (  0, 49)  

* 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. 17   3 49.83   16 21.1   3.471   4.318   144   17.4   2:11 (  0, 71)  
Oct. 24   3 46.60   16 13.1   3.408   4.310   151   17.4   1:40 (  0, 71)  

* 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. 17   9 45.12   40  2.3   1.695   1.656    70   17.4   4:42 (247, 50)  
Oct. 24  10  3.65   40 14.4   1.688   1.705    73   17.4   4:48 (248, 53)  

* 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. 17   9  2.75  -39 33.6   4.160   3.857    65   17.5   4:42 (330,  7)  
Oct. 24   9  1.79  -41 50.7   4.062   3.826    69   17.4   4:48 (337,  8)  

* 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. 17  22 33.23   -8 29.8   1.357   2.169   133   17.5  20:51 (  0, 47)  
Oct. 24  22 31.11   -7 20.9   1.394   2.142   126   17.5  20:21 (  0, 48)  

* 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. 17  21  1.98  -17  8.5   1.415   1.988   109   17.7  19:20 (  0, 38)  
Oct. 24  21  7.45  -15 27.4   1.466   1.969   104   17.6  18:58 (  0, 40)  

* 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. 17   8 12.67   -0  0.2  10.459  10.304    78   17.7   4:42 (318, 47)  
Oct. 24   8 13.97   -0 11.6  10.337  10.290    84   17.7   4:48 (328, 50)  

* 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. 17   3 46.15   46 51.4  10.337  11.026   131   17.8   2:07 (180, 78)  
Oct. 24   3 43.53   47  7.9  10.250  11.001   137   17.8   1:37 (180, 78)  

* 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. 17   0  8.42    2 36.3   3.538   4.486   159   17.8  22:25 (  0, 58)  
Oct. 24   0  4.62    2 40.6   3.636   4.539   152   17.9  21:54 (  0, 58)  

* (3200) Phaethon

Now it is around the aphelion. It is observable at 17.5 mag in excellent condition in autumn 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. 17   3 31.13   42 43.1   1.529   2.354   136   18.0   1:53 (180, 82)  
Oct. 24   3 14.16   42 21.3   1.487   2.367   144   17.8   1:09 (180, 83)  

* 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. 17  21 47.42   44 11.2   4.217   4.811   121   17.9  20:05 (180, 81)  
Oct. 24  21 48.90   42 35.9   4.283   4.846   119   18.0  19:39 (180, 82)  

* 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. 17  22 25.53    4 58.0   0.474   1.374   135   21.1  20:45 (  0, 60)  
Oct. 24  22 44.45    5 27.5   0.558   1.436   133   21.5  20:36 (  0, 61)  

* 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. 17   2 17.38    3 16.5   0.829   1.812   165   24.7   0:39 (  0, 58)  
Oct. 24   2 12.79    3 23.6   0.847   1.836   170   25.5   0:06 (  0, 58)  

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