Weekly Information about Bright Comets (2017 June 10: North)

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Updated on June 14, 2017
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Best time and the azimuth, altitude (A,h) are at lat. 35 deg in the Northern Hemisphere.
Azimuth indicates 0 for south, 90 for west, 180 for north, 270 for east.

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* C/2015 V2 ( Johnson )

Now it is 7.5 mag (June 2, Marco Goiato). It was expected to brighten up to 6-7 mag from April to July. But it is fainter than predicted recently. In the Northern Hemisphere, it stays observable in excellent condition until June. In the Southern Hemisphere, it becomes observable in good condition after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  14 29.67   12 51.3   0.816   1.637   126    6.7  21:13 (  0, 67)  
June 17  14 21.44    5  2.0   0.841   1.638   123    6.8  21:03 ( 12, 59)  

* C/2015 ER61 ( PanSTARRS )

Outburst occured on Apr. 4, and it brightened by 2 mag, up to 6.2 mag (Apr. 7, Juan Jose Gonzalez). It is very bright as 8.6 mag still now (June 3, Marco Goiato). It stays observable for a long time after this. But it locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   1 28.53   14 35.5   1.436   1.163    53    7.9   2:59 (264, 17)  
June 17   1 49.65   16 25.3   1.482   1.218    54    8.2   2:58 (263, 19)  

* 71P/Clark

Now it is bright as 10.8 mag (June 3, Marco Goiato). It is 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)  
June 10  16 31.66  -29 21.2   0.590   1.598   168   10.4  23:15 (  0, 25)  
June 17  16 29.04  -30 58.2   0.593   1.591   162   10.4  22:45 (  0, 24)  

* 41P/Tuttle-Giacobini-Kresak

It approached to Earth down to 0.14 a.u. from late March to early April, and it brightened up to 6.0 mag (Apr. 7, Juan Jose Gonzalez). Now it is fading. But it is bright as 9.5 mag still now (May 29, Chris Wyatt). It is observable in excellent condition in the Northern Hemisphere. It is observable in good condition after this also in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  18 24.67    8 48.7   0.334   1.299   143   11.4   1:12 (  0, 64)  
June 17  18 20.30    4 28.8   0.372   1.353   150   12.2   0:40 (  0, 60)  

* 103P/Hartley 2

It has not been observed yet in this apparition. The condition of this apparition is worst. It will brighten up to 10 mag in spring, but not observable at all.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   5 45.16   17 18.3   2.257   1.267     9   11.6  20:59 (127,-17)  
June 17   6 10.97   16 48.4   2.309   1.318     9   12.0  21:03 (127,-19)  

* 217P/LINEAR

Now it is 14.0 mag (May 19, Kunihiro Shima). It will brighten rapidly, and it is expected to brighten up to 12 mag from July to September. In the Southern Hemisphere, it stays at the same altitude in the morning sky. In the Northern Hemisphere, it will be getting higher slowly.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   1 25.23    2 12.9   1.521   1.320    58   13.2   2:59 (275, 11)  
June 17   1 52.30    3 52.6   1.487   1.292    58   12.9   2:58 (274, 12)  

* 29P/Schwassmann-Wachmann 1

Outburst occured on Apr. 23. It is bright as 13.3 mag still now (May 29, Chris Wyatt).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  21 42.24  -13 24.5   5.326   5.839   115   13.4   2:59 (332, 37)  
June 17  21 41.80  -13 20.6   5.229   5.838   122   13.3   2:58 (340, 39)  

* C/2015 VL62 ( Lemmon-Yeung-PanSTARRS )

Now it is 14.3 mag (June 4, T. Ikemura, H. Sato). It will brighten up to 12-13 mag and will be observable in good condition in summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   0 15.13   15 53.0   3.030   2.844    69   13.9   2:59 (273, 33)  
June 17   0 10.47   15 57.3   2.867   2.823    77   13.7   2:58 (278, 39)  

* C/2016 R2 ( PanSTARRS )

Now it is 14.7 mag (Feb. 20, Thomas Lehmann). It is not observable now in the Northern Hemisphere. It will be unobservable temporarily in May also in the Southern Hemisphere. It will be getting higher gradually in the morning sky after summer. Then it will be observable at 11 mag for a long time from 2017 autumn to 2018 winter.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   4 13.64   -9 11.8   5.041   4.253    35   13.8   2:59 (260,-30)  
June 17   4 20.28   -8 27.0   4.962   4.202    37   13.7   2:58 (262,-26)  

* 65P/Gunn

Now it is 13.7 mag (May 26, Chris Wyatt). It will brighten up to 14 mag from spring to summer. It locates somewhat low in the Northern Hemisphere. The perihelion distance increased from 2.4 a.u. to 2.9 a.u. in this apparition. So it will not be bright as before.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  15 56.08  -21 42.2   1.997   2.980   162   14.0  22:40 (  0, 33)  
June 17  15 51.48  -21 48.7   2.023   2.973   154   14.0  22:08 (  0, 33)  

* C/2017 E1 ( Borisov )

It brightened up to 11 mag from March to April. Now it is fading. But it is bright as 12.7 mag still now (May 26, iTelescope Observatory, Siding Spring). It is not observable now in the Northern Hemisphere. In the Southern Hemisphere, it stays observable for a long time, but it stays low.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   2 27.59    6 55.2   1.949   1.387    42   14.1   2:59 (262,  1)  
June 17   2 44.49    7 24.7   1.999   1.474    45   14.5   2:58 (263,  3)  

* C/2016 N4 ( MASTER )

Now it is 15.6 mag (June 4, T. Ikemura, H. Sato). In the Northern Hemisphere, it will brighten up to 14 mag from summer to winter, and it will be observable in excellent condition. In the Southern Hemisphere, it will be observable in the very low sky only from May to June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   0 34.09   33 53.0   3.707   3.336    61   14.6   2:59 (251, 37)  
June 17   0 37.32   36 26.2   3.606   3.317    65   14.5   2:58 (250, 42)  

* C/2015 O1 ( PanSTARRS )

Now it is 14.5 mag (June 4, T. Ikemura, H. Sato). It will be observable at 14 mag for a long time from 2017 to 2018.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  18  6.27   20 10.3   3.570   4.346   134   14.5   0:54 (  0, 75)  
June 17  17 54.46   21 16.5   3.535   4.316   135   14.5   0:15 (  0, 76)  

* C/2016 M1 ( PanSTARRS )

Now it is 15.6 mag (May 20, Kunihiro Shima). It is expected to brighten up to 9 mag in summer in 2018. In the Northern Hemisphere, it stays observable until 2018 summer while the comet will be brightening. In the Southern Hemisphere, it is hardly observable in 2017, but it will be observable in good condition in 2018.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  18 29.23   54  8.4   4.660   4.957   101   15.3   1:17 (180, 71)  
June 17  18 19.54   53 58.6   4.584   4.900   102   15.2   0:40 (180, 71)  

* 73P/Schwassmann-Wachmann 3

It brightened up to 11.5 mag from late March to early April (Mar. 24, Andrew Pearce). Now it is fading. It has already faded down to 15.6 mag (May 6, CAO, San Pedro de Atacama). Bright 12-mag new fragment BT was discovered on Feb. 10, but now it is faint as 16.7 mag (Apr. 18, F.-J. Hambsch, E. Bryssinck). In the Southern Hemisphere, it stays observable for a long time after this. It is getting observable in the morning sky again also in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   1 47.03    1 30.4   1.850   1.502    54   15.4   2:59 (272,  6)  
June 17   2  0.72    2 37.0   1.863   1.567    57   15.7   2:58 (273,  9)  

* C/2011 KP36 ( Spacewatch )

Now it is 15.6 mag (Mar. 6, Kunihiro Shima). It is appearing in the morning sky in the Southern Hemisphere. It will appear in the morning sky in July in the Northern Hemisphere. Then it stays observable at 15.5 mag unil the end of 2017.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   2 52.36    4 32.5   6.348   5.589    38   15.5   2:59 (260, -6)  
June 17   2 57.96    4 41.2   6.305   5.613    43   15.5   2:58 (263, -1)  

* C/2017 D2 ( Barros )

Now it is 16.9 mag (May 31, CAO, San Pedro de Atacama). It will brighten up to 15.5 mag in summer. It will be observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it stays unobservable for some more time.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  22  5.12  -38 42.0   1.885   2.513   116   15.9   2:59 (338, 12)  
June 17  22  7.60  -37 54.2   1.809   2.503   122   15.8   2:58 (342, 14)  

* C/2016 N6 ( PanSTARRS )

Now it is 16.1 mag (May 29, Hiroshi Abe). It is expected to brighten up to 11-12 mag from 2018 to 2019. In the Northern Hemisphere, it stays observable in good condition while the comet will be brightening gradually. In the Southern Hemisphere, it is not observable until 2018 October.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  17  7.15   61  0.0   4.566   4.780    96   16.0  23:49 (180, 64)  
June 17  16 50.56   61 31.0   4.539   4.729    94   15.9  23:05 (180, 63)  

* P/2017 L1 ( Skiff )

First return of a new periodic comet discovered in 2000. Now it is 17.8 mag (Hidetaka Sato). It will brighten rapidly, and it is expected to be observable at 15.5 mag in good condition from July to September.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   0 27.23  -15 47.1   2.513   2.538    79   16.2   2:59 (298, 11)  
June 17   0 36.21  -14 51.0   2.436   2.536    83   16.1   2:58 (301, 15)  

* C/2014 B1 ( Schwartz )

Now it is 16.6 mag (May 27, T. Ikemura, H. Sato). It stays 16-17 mag for a long time from 2016 to 2019. It stays near by the equator.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   9 17.65    7  3.2  10.024   9.571    60   16.1  20:59 ( 87, 17)  
June 17   9 20.36    7  4.1  10.117   9.568    54   16.1  21:03 ( 91, 11)  

* 213P/Van Ness

Now it is 15.9 mag (May 29, T. Ikemura, H. Sato). It was expected to brighten up to 12 mag in summer. But actually, it is fainter than expected by 3-4 mag. 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)  
June 10  19 28.54  -32 58.5   1.212   2.144   148   16.4   2:16 (  0, 22)  
June 17  19 25.78  -32 46.0   1.160   2.125   155   16.1   1:46 (  0, 22)  

* C/2017 K4 ( ATLAS )

Now it is 15.8 mag (May 28, iTelescope Observatory, Siding Spring). It stays 16 mag for a long time until summer in 2018. In the Southern Hemisphere, it stays observable in excellent condition until autumn. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  17  2.92  -38 28.9   2.424   3.412   164   16.3  23:47 (  0, 17)  
June 17  16 58.15  -37 59.1   2.383   3.366   162   16.2  23:14 (  0, 17)  

* 47P/Ashbrook-Jackson

Now it is 16.7 mag (June 4, T. Ikemura, H. Sato). It was observed at 17 mag in 2016. In 2017, it will be observable at 15.5 mag in good condition from summer to autumn.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   0 51.43    4 58.7   3.087   2.818    65   16.3   2:59 (278, 19)  
June 17   0 59.37    6 10.5   3.005   2.818    69   16.2   2:58 (280, 24)  

* 81P/Wild 2

It brightened up to 11 mag from spring to summer in 2016. Now it is 17.0 mag (June 2, T. Ikemura, H. Sato). It is observable at 16-17 mag in good condition from spring to summer.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  20 29.53  -17 10.9   2.351   3.138   133   16.3   2:59 (355, 38)  
June 17  20 25.90  -17 25.7   2.320   3.176   141   16.3   2:46 (  0, 38)  

* 2P/Encke

Now it is fading rapidly. It has already faded down to 16.9 mag (June 2, T. Ikemura, H. Sato). In the Southern Hemisphere, it stays observable in good condition after this while the comet will be fading. It locates low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  22 46.25  -18 28.2   1.162   1.705   102   16.3   2:59 (319, 25)  
June 17  22 39.19  -19 18.1   1.149   1.790   111   16.6   2:58 (327, 29)  

* C/2014 OE4 ( PanSTARRS )

Now it is 16.4 mag (June 1, P. Carson). It stays 16 mag from 2016 to 2017. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it will never be observable again.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  18 46.74   63 37.0   6.260   6.367    91   16.3   1:34 (180, 61)  
June 17  18 40.87   64 23.7   6.269   6.377    91   16.3   1:00 (180, 61)  

* 315P/2013 V6 ( LONEOS )

Small outburst occured in mid March, and it brightened up to 12.3 mag (Mar. 15, Juan Jose Gonzalez). Now it is fading. It has already faded down to 17.0 mag (May 29, Hiroshi Abe). It is still bright visually as 13.9 mag (May 27, Jakub Cerny). It is observable in excellent condition in the Northern Hemisphere. It stays low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  11 49.72   19  9.2   2.611   2.813    90   16.5  20:59 ( 73, 54)  
June 17  11 55.56   17 37.4   2.720   2.839    86   16.7  21:03 ( 76, 48)  

* C/2016 B1 ( NEOWISE )

Now it is 16.9 mag (June 4, M. Jaeger, E. Prosperi, S. Prosperi, W. Vollmann). It will fade out after this, and it will be fainter than 18 mag in August.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  18 12.66   24 23.2   2.922   3.663   130   16.6   1:00 (  0, 79)  
June 17  18  8.20   25 28.7   2.950   3.694   130   16.7   0:28 (  0, 80)  

* C/2017 K6 ( Jacques )

Now it is 17.0 mag (May 29, iTelescope Observatory, Siding Spring). It will brighten up to 14.5 mag in winter. In the Southern Hemisphere, it stays observable in excellent condition until spring in 2018. In the Northern Hemisphere, it stays unobservable until 2018.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  23 22.89  -59 52.0   2.675   3.148   108   17.1   2:59 (338,-13)  
June 17  23 39.13  -61 42.0   2.584   3.093   110   17.0   2:58 (340,-13)  

* C/2014 W2 ( PanSTARRS )

It stayed bright 12 mag for a long time from autum in 2015 to summer in 2016. Now it is fading. It has already faded dwon to 16.2 mag (June 2, T. Ikemura, H. Sato).

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  16 24.60  -13 13.4   4.187   5.174   165   17.1  23:08 (  0, 42)  
June 17  16 18.39  -13 46.5   4.270   5.226   158   17.2  22:34 (  0, 41)  

* P/2016 S1 ( PanSTARRS )

Now it is 16.0 mag (May 23, iTelescope Observatory, Siding Spring). It is observable in good condition in the Southern Hemisphere. But it will be fainter than 18 mag in August. It is not observable in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   8 31.36  -64 43.2   2.228   2.538    95   17.3  20:59 ( 29,-29)  
June 17   9 11.44  -62 44.4   2.252   2.558    95   17.3  21:03 ( 31,-28)  

* C/2017 D3 ( ATLAS )

Now it is 17.1 mag (May 29, T. Ikemura, H. Sato). It will be fading and getting lower in the evening sky after this.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  11 51.99  -12  7.5   4.644   4.983   103   17.3  20:59 ( 42, 32)  
June 17  11 50.86  -10 51.4   4.770   4.987    96   17.4  21:03 ( 50, 28)  

* C/2014 R3 ( PanSTARRS )

Now it is 16.9 mag (June 6, Mt. Lemmon Survey). It brightened rapidly, and became brighter than originally expected. It stays 16-17 mag until 2017. In the Northern Hemisphere, it stays observable in excellent condition for a long time. It is not observable in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  11 18.70   52 58.7   7.770   7.531    72   17.4  20:59 (134, 54)  
June 17  11 17.76   51 55.1   7.860   7.542    68   17.4  21:03 (131, 50)  

* C/2017 E3 ( PanSTARRS )

Now it is 17.2 mag (June 5, ATLAS-MLO, Mauna Loa). It is observable in good condition in the Southern Hemisphere. It stays extremely low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  12 38.56  -33 19.2   5.345   5.915   119   17.4  20:59 ( 21, 18)  
June 17  12 39.54  -32  8.5   5.430   5.916   113   17.4  21:03 ( 28, 17)  

* C/2013 X1 ( PanSTARRS )

It brightened up to 6.2 mag in June in 2016 (June 24, Marco Goiato). Now it is 16.6 mag (May 27, T. Ikemura, H. Sato). In the Southern Hemisphee, it stays observable in excellent condition after this. It stays low in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  12 29.72  -23  3.8   4.611   5.133   115   17.4  20:59 ( 27, 27)  
June 17  12 27.10  -22 15.2   4.784   5.197   108   17.6  21:03 ( 35, 24)  

* C/2017 B3 ( LINEAR )

Now it is 17.1 mag (May 20, Ken-ichi Kadota). It stays 15 mag from 2018 to 2019, and it will be observable for a long time in the Southern Hemisphere. In the Northern Hemisphere, it is observable only until June.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  11 56.88  -26 32.9   5.922   6.333   109   17.6  20:59 ( 33, 20)  
June 17  11 56.42  -26 28.4   5.979   6.291   103   17.6  21:03 ( 39, 17)  

* C/2015 LC2 ( PanSTARRS )

It has been 17 mag from 2016 to 2017. It stays bright even after the perihelion passage. It is bright as 17.7 mag still now (June 4, Mt. Lemmon Survey). It is observable in excellent condition in the Northern Hemisphere. It locates somewhat low in the Southern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  15 10.37   31  9.7   7.393   7.927   118   17.7  21:54 (  0, 86)  
June 17  15  7.39   31 17.9   7.489   7.957   114   17.7  21:24 (  0, 86)  

* P/2004 T1 ( LINEAR-NEAT )

Return of a new periodic comet which brightened up to 13 mag in 2004. It was not recovered in 2011. It will be observable in excellent condition in autumn. It is expected to brighten up to 14 mag, if the comet is as bright as when it was discovered.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10   0 12.33  -11 14.7   1.953   2.055    80   18.1   2:59 (297, 17)  
June 17   0 25.66  -10  9.6   1.857   2.023    84   17.7   2:58 (299, 20)  

* C/2015 H2 ( PanSTARRS )

It stays observable at 18 mag from spring to summer. It is observable in excellent condition in the Southern Hemisphere. In the Northern Hemisphere, it stays low for a while.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  22 31.99  -33 53.2   4.939   5.381   110   17.8   2:59 (331, 14)  
June 17  22 32.36  -33 54.5   4.870   5.402   116   17.8   2:58 (336, 16)  

* 130P/McNaught-Hughes

Now it is 17.9 mag (May 27, T. Ikemura, H. Sato). It will be brightening slowly until autumn when it becomes 16.5-17 mag. It will be getting lower gradually in the Northern Hemisphere.

Date(TT)  R.A. (2000) Decl.   Delta     r    Elong.  m1   Best Time(A, h)  
June 10  14 16.16  -10 32.1   1.730   2.561   136   17.8  21:00 (  0, 44)  
June 17  14 13.54  -10 40.3   1.762   2.527   128   17.8  21:03 ( 11, 44)  

* C/2013 C2 ( Tenagra )

Very far object. Outburst occured on Feb. 20, 2015, and it brightened up to 15 mag. Now it is 18.7 mag (May 27, T. Ikemura, H. Sato). It is 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)  
June 10  14 22.07  -24  1.0   8.631   9.442   141   17.9  21:06 (  0, 31)  
June 17  14 21.10  -23 44.7   8.711   9.448   134   18.0  21:03 (  7, 31)  

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