Weekly Information about Bright Comets (2015 Oct. 3: South)

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Updated on October 3, 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/2013 US10 ( Catalina )

Now it is 6.6 mag (Oct. 1, Marco Goiato). It is expected to brighten up to 4-5 mag from autumn to winter. But it is a bit fainter than this ephemeris recently. It will become unobservable in mid October 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.  3  14 36.74  -37 39.7   1.633   1.149    44    5.7  19:29 ( 60, 24)  
Oct. 10  14 33.54  -34 21.7   1.710   1.067    35    5.5  19:36 ( 59, 16)  

* C/2014 S2 ( PanSTARRS )

It brightened very rapidly. Now it is so bright as 10.4 mag (Oct. 2, Maik Meyer). It is observable at 10-12 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.  3   2 48.34   87 15.9   1.910   2.246    95   10.5   2:12 (180,-32)  
Oct. 10  17  7.74   88  8.9   1.888   2.219    95   10.3  19:36 (178,-34)  

* 22P/Kopff

Now it is very bright as 10.4 mag (Sept. 16, 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.  3  15 54.40  -18 20.7   1.996   1.574    51   10.9  19:29 ( 88, 31)  
Oct. 10  16 15.27  -19 35.6   2.022   1.566    49   10.9  19:36 ( 85, 28)  

* 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 11.3 mag still now (Sept. 20, Seiichi Yoshida). 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.  3  16 17.93   33 11.0   3.791   3.478    64   11.6  19:29 (134,  2)  
Oct. 10  16 25.59   31 17.0   3.909   3.550    61   11.7  19:36 (128, -1)  

* 10P/Tempel 2

Now it is 11.1 mag (Sept. 24, Thomas Lehmann). Finally it became bright. It will brighten up to 11 mag from autumn to winter. 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.  3  16 28.95  -19 14.9   1.721   1.486    59   11.8  19:29 ( 92, 38)  
Oct. 10  16 49.43  -20 47.3   1.738   1.466    57   11.6  19:36 ( 88, 36)  

* C/2013 X1 ( PanSTARRS )

Now it is bright as 12.5 mag (Sept. 21, Seiichi Yoshida). 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.  3   5 29.86   41 13.9   2.596   3.006   104   12.4   4:09 (187, 13)  
Oct. 10   5 19.61   42 19.3   2.399   2.933   112   12.1   3:58 (182, 13)  

* 67P/Churyumov-Gerasimenko

Now it is bright as 11.1 mag (Sept. 21, Seiichi Yoshida). 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.  3   9 33.03   19 16.3   1.800   1.389    50   12.1   4:09 (243,  4)  
Oct. 10   9 53.20   17 59.4   1.805   1.427    52   12.2   3:58 (244,  5)  

* 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 12.1 mag (Sept. 22, 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.  3  14 18.82  -46 55.3   2.424   1.919    48   12.7  19:29 ( 49, 25)  
Oct. 10  14 39.94  -48 30.2   2.571   2.030    47   13.0  19:36 ( 46, 24)  

* 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 12.2 mag still now (Sept. 18, Carlos Labordena). It is observable in good condition in the Northern Hemisphere, but it will be unobservable soon in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  3  18 59.88   45 25.2   1.362   1.788    97   12.7  19:29 (167,  8)  
Oct. 10  19  8.82   45 40.8   1.425   1.825    96   13.0  19:36 (162,  6)  

* 29P/Schwassmann-Wachmann 1

It brightened up to 12.9 mag in outburst on Sept. 22 (Jean-Francois Soulier).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  3  17 27.97  -29  7.6   6.204   6.002    73   13.8  19:29 ( 87, 54)  
Oct. 10  17 31.76  -29  1.0   6.307   6.000    67   13.8  19:36 ( 84, 48)  

* 141P/Machholz 2

It brightened rapidly in mid August. Now it is very bright as 11.5 mag (Sept. 21, Michael Jager). Secondary component H is also visible as 15 mag (Sept. 21, Michael Jager). 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)  
Oct.  3   9 38.90    8 52.6   1.397   0.995    45   13.8   4:09 (252, 10)  
Oct. 10   9 56.97    6  4.8   1.454   1.067    47   14.5   3:58 (254, 11)  

* 19P/Borrelly

Now it is 12.5 mag (Sept. 13, Michael Jager). 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.  3  11 22.14   26 16.5   2.681   1.943    34   13.9   4:09 (251,-20)  
Oct. 10  11 38.87   25 21.8   2.693   1.993    37   14.0   3:58 (252,-20)  

* C/2014 W2 ( PanSTARRS )

Now it is 14.4 mag and visible visually (Sept. 6, Sandor Szabo). 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.  3   7 14.33   64  1.9   2.996   3.140    88   14.1   4:09 (195,-13)  
Oct. 10   7 28.34   66 57.5   2.886   3.104    93   13.9   3:58 (193,-15)  

* 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.  3  19 23.83  -14  4.3   3.507   3.829   101   14.1  19:29 (148, 66)  
Oct. 10  19 28.71  -14 19.0   3.631   3.856    95   14.2  19:36 (133, 62)  

* C/2015 G2 ( MASTER )

It brightened up to 6.0 mag in mid May (May 14, Chris Wyatt). Now it is fading. But it is bright as 12.5-13.0 mag still now (Sept. 12, Michael Jager). 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.  3   8 40.69   21 35.9   2.612   2.324    62   14.2   4:09 (233, 12)  
Oct. 10   8 38.34   22 43.8   2.564   2.415    70   14.4   3:58 (229, 14)  

* C/2014 A4 ( SONEAR )

Now it is 15.6 mag (Sept. 13, Sandor Szabo). 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.  3   2  9.34   14 27.6   3.263   4.187   154   14.3   1:26 (180, 40)  
Oct. 10   1 56.80   14 43.1   3.222   4.190   163   14.3   0:46 (180, 40)  

* 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.  3   2 43.31   12  7.9   1.337   2.243   146   14.3   2:00 (180, 43)  
Oct. 10   2 36.29   11 45.5   1.343   2.289   155   14.6   1:25 (180, 43)  

* C/2011 KP36 ( Spacewatch )

Now it is 14.1 mag and visible visually (Aug. 21, Uwe Pilz). 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.  3  21  9.59   -5 48.4   4.498   5.175   128   14.4  20:23 (180, 61)  
Oct. 10  21  9.96   -6 14.8   4.568   5.159   121   14.4  19:55 (180, 61)  

* C/2015 P3 ( SWAN )

It was bright as 10.3 mag in August (Aug. 10, Juan Jose Gonzalez). Now it is fading. No observations have been reported in September. In the Southern Hemisphere, it keeps observable in the evening sky until the comet becomes fainter than 18 mag in winter. In the Northern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  3  15 50.59  -53 26.6   1.568   1.441    63   14.6  19:29 ( 46, 41)  
Oct. 10  16 19.96  -56 23.0   1.700   1.542    63   15.0  19:36 ( 42, 41)  

* 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 bright as 13.7 mag (Sept. 21, Seiichi Yoshida). It keeps observable in excellent condition for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  3   4 53.64    6  2.4   1.446   2.081   115   14.8   4:09 (180, 49)  
Oct. 10   4 54.49    4 46.7   1.423   2.124   121   15.1   3:43 (180, 50)  

* 318P/2014 M6 ( McNaught-Hartley )

First return of a periodic comet discovered in 1994. Now it is 15.1 mag (Oct. 2, Katsumi Yoshimoto). 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)  
Oct.  3  22 33.38  -32 15.5   1.651   2.455   134   14.9  21:46 (180, 87)  
Oct. 10  22 32.31  -30 53.9   1.699   2.451   128   15.0  21:18 (180, 86)  

* 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.  3  11 20.50    6  6.7   3.206   2.298    20   15.1   4:09 (269, -9)  
Oct. 10  11 33.87    4 36.9   3.159   2.284    24   15.0   3:58 (270, -7)  

* C/2014 N3 ( NEOWISE )

Now it is 14.9 mag (Aug. 26, D. Buczynski). 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.  3   1 49.66   44 26.8   3.488   4.264   135   15.0   1:06 (180, 11)  
Oct. 10   1 40.69   45 21.5   3.476   4.289   139   15.0   0:30 (180, 10)  

* 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.  3   2 33.76    7 30.9   1.187   2.114   149   15.2   1:50 (180, 47)  
Oct. 10   2 32.03    6 47.3   1.159   2.115   157   15.2   1:21 (180, 48)  

* 230P/LINEAR

Now it is 17.1mag (Aug. 27, A. Maury, J.-G. Bosch, J.-F. Soulier, T. Noel). 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.  3   4 29.15   -7 56.1   0.797   1.562   120   15.4   3:44 (180, 63)  
Oct. 10   4 40.46   -8 33.7   0.750   1.541   122   15.3   3:28 (180, 64)  

* 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.  3   5 37.68   62  8.5   4.921   5.185    99   15.6   4:09 (185, -8)  
Oct. 10   5 37.86   63 42.6   4.842   5.185   104   15.6   3:58 (183, -9)  

* 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.  3   1 24.37    0 28.7   2.940   3.921   167   16.0   0:41 (180, 54)  
Oct. 10   1 19.81    0  8.5   2.945   3.937   171   16.1   0:09 (180, 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.  3   4 26.11   28 24.9   1.906   2.554   119   16.1   3:42 (180, 27)  
Oct. 10   4 26.08   28 30.7   1.858   2.581   126   16.1   3:14 (180, 26)  

* 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.  3  23  9.84  -29  8.5   4.318   5.139   141   16.1  22:22 (180, 84)  
Oct. 10  23  2.33  -29  9.7   4.455   5.205   134   16.2  21:47 (180, 84)  

* 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.  3   2  8.51  -30 28.5   2.100   2.931   139   16.3   1:25 (180, 85)  
Oct. 10   1 46.64  -34  0.8   2.075   2.897   138   16.2   0:36 (180, 89)  

* 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.  3   5 55.00   20  3.4   2.605   2.955   100   16.5   4:09 (197, 33)  
Oct. 10   5 59.21   19 57.8   2.473   2.916   106   16.3   3:58 (194, 34)  

* 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.  3   0 10.52    1 26.1   1.101   2.099   173   16.3  23:23 (180, 54)  
Oct. 10   0  6.41    0 43.9   1.150   2.132   165   16.6  22:51 (180, 54)  

* C/2010 S1 ( LINEAR )

Now it is 15.1 mag (July 13, Yuji Ohshima). It will be unobservable in mid November.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  3  17 34.52  -26 43.5   8.565   8.363    75   16.5  19:29 ( 92, 55)  
Oct. 10  17 34.91  -26 57.0   8.713   8.395    68   16.6  19:36 ( 87, 48)  

* P/2003 WC7 ( LINEAR-Catalina )

It has not been recovered yet. But it must be already bright as 16.5 mag. 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.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  3   4 39.68   -6 51.3   1.095   1.795   117   16.7   3:55 (180, 62)  
Oct. 10   4 47.24   -6 34.6   1.025   1.768   121   16.5   3:35 (180, 62)  

* 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.  3   7 37.28   31  6.7   2.009   2.058    78   17.2   4:09 (215, 14)  
Oct. 10   7 53.17   30 55.8   1.904   2.021    81   16.7   3:58 (215, 14)  

* 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.  3  23 30.43   -7 58.8   1.509   2.474   160   16.8  22:43 (180, 63)  
Oct. 10  23 28.49   -8 20.6   1.542   2.474   152   16.8  22:13 (180, 63)  

* 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.  3  22 51.11    0 55.2   5.621   6.536   154   17.1  22:03 (180, 54)  
Oct. 10  22 47.13   -0  1.7   5.727   6.582   146   17.1  21:32 (180, 55)  

* 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.  3  23  8.82   -5  9.7   4.936   5.870   156   17.2  22:21 (180, 60)  
Oct. 10  23  6.90   -5 25.3   4.992   5.874   149   17.3  21:52 (180, 60)  

* 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.  3   0 39.21   -4 25.7   1.747   2.741   171   17.3  23:51 (180, 59)  
Oct. 10   0 33.96   -5 18.3   1.729   2.710   166   17.2  23:18 (180, 60)  

* 162P/Siding Spring

Now it is 16.3 mag (Aug. 22, 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.  3   9  3.87   39 33.4   1.700   1.562    64   17.3   4:09 (223, -4)  
Oct. 10   9 25.17   39 49.5   1.698   1.608    67   17.3   3:58 (224, -5)  

* 327P/2015 P2 ( Van Ness )

Now it is 17.8 mag (Oct. 2, Michael Jager). It is observable at 17.5 mag in good condition from autumn to winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
Oct.  3  18 52.28    4 39.0   1.313   1.717    94   17.4  19:29 (149, 46)  
Oct. 10  19  4.91    1 28.8   1.336   1.689    91   17.4  19:36 (140, 46)  

* 74P/Smirnova-Chernykh

Now it is 18.9 mag (Aug. 25, S. Shurpakov). 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.  3   3 54.15   16 32.3   3.631   4.334   129   17.5   3:10 (180, 38)  
Oct. 10   3 52.37   16 27.6   3.546   4.326   136   17.5   2:41 (180, 38)  

* 50P/Arend

Now it is 17.1 mag (Aug. 23, E. Bryssinck). 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.  3  22 42.38  -10 29.6   1.309   2.226   148   17.6  21:55 (180, 65)  
Oct. 10  22 37.07   -9 32.7   1.328   2.197   141   17.5  21:22 (180, 64)  

* C/2015 K1 ( MASTER )

Now it is 16.0 mag (Aug. 20, 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.  3   0 17.46    2 31.4   3.383   4.382   175   17.6  23:29 (180, 52)  
Oct. 10   0 12.76    2 33.5   3.453   4.434   167   17.7  22:57 (180, 52)  

* 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 18.3 mag (Aug. 23, S. Shurpakov). 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.  3   3 50.36   46 11.9  10.543  11.076   119   17.8   3:06 (180,  9)  
Oct. 10   3 48.45   46 32.7  10.436  11.051   125   17.8   2:37 (180,  8)  

* C/2013 G3 ( PanSTARRS )

Now it is 17.8 mag (Aug. 19, 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)  
Oct.  3  21 46.86   47 17.9   4.117   4.743   123   17.8  20:59 (180,  8)  
Oct. 10  21 46.73   45 45.8   4.162   4.777   122   17.9  20:32 (180,  9)  

* P/1998 QP54 ( LONEOS-Tucker )

Periodic comet discovered in 1998. But it was not recovered in 2007. Michael Jager detected it at 18.0 mag on Oct. 1. 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.  3  20 52.50  -20 58.5   1.340   2.038   120   18.0  20:06 (180, 76)  
Oct. 10  20 54.93  -19 21.1   1.384   2.015   114   17.9  19:41 (180, 74)  

* P/2015 Q1 ( Scotti )

Now it is 16.5 mag (Sept. 24, J. V. Scotti), brighter than this ephemeris. 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.  3   5 48.45    7 12.5   1.265   1.765   101   18.0   4:09 (200, 46)  
Oct. 10   5 58.50    4 48.4   1.221   1.774   105   17.9   3:58 (198, 49)  

* 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.  3  21 33.69    3 29.3   0.328   1.255   135   20.1  20:49 (180, 51)  
Oct. 10  22  2.67    4 21.4   0.397   1.313   135   20.6  20:50 (180, 51)  

* 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.  3   2 24.24    3 14.9   0.821   1.770   152   23.2   1:40 (180, 52)  
Oct. 10   2 21.38    3 14.3   0.820   1.790   159   23.9   1:10 (180, 52)  

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