Weekly Information about Bright Comets (2017 July 1: South)

Japanese version Home page	Updated on July 7, 2017
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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.

C/2015 V2 ( Johnson ) Now it is 7.7 mag (June 28, 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 will be getting lower after this, and it will be unobservable in August. In the Southern Hemisphere, it is observable in good condition after this. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 14 13.13 -9 26.1 0.945 1.656 115 7.1 19:35 (180, 65) July 8 14 12.71 -15 39.0 1.020 1.673 110 7.3 19:07 (180, 71) 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 8.9 mag still now (June 24, Marco Goiato). It stays observable for a long time after this. But it locates low in the Northern Hemisphere. A fragment of 15 mag was detected in mid June. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 2 27.15 19 16.6 1.562 1.348 58 8.8 5:38 (216, 27) July 8 2 43.55 20 21.3 1.595 1.419 61 9.0 5:37 (213, 27) 71P/Clark Now it is bright as 10.3 mag (June 28, 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) July 1 16 28.23 -33 43.3 0.625 1.586 149 10.3 21:50 (180, 89) July 8 16 30.96 -34 49.5 0.651 1.588 143 10.4 21:25 (180, 90) 217P/LINEAR Now it is bright as 13.0 mag (June 30, Chris Wyatt). 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) July 1 2 47.19 6 53.6 1.444 1.251 58 12.5 5:38 (228, 35) July 8 3 14.55 8 10.9 1.434 1.240 57 12.3 5:37 (227, 34) 103P/Hartley 2 It has not been observed yet in this apparition. The condition of this apparition is worst. It must have brightened up to 10 mag in spring, but it is not observable at all. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 6 58.87 15 17.1 2.423 1.428 9 12.7 18:29 (102,-10) July 8 7 20.94 14 19.1 2.483 1.486 8 13.1 18:32 (100,-11) C/2015 VL62 ( Lemmon-Yeung-PanSTARRS ) Now it is 14.6 mag (June 30, Chris Wyatt). 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) July 1 23 55.90 15 45.8 2.534 2.788 93 13.4 5:20 (180, 39) July 8 23 45.29 15 24.7 2.371 2.773 102 13.2 4:42 (180, 39) 29P/Schwassmann-Wachmann 1 Now it is bright as 12.4 mag (June 30, Chris Wyatt). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 21 39.35 -13 20.2 5.056 5.835 136 13.3 3:04 (180, 68) July 8 21 37.40 -13 23.4 4.984 5.833 143 13.2 2:34 (180, 68) C/2016 R2 ( PanSTARRS ) In the Southern Hemisphere, it will be getting higher gradually in the morning sky after this. Then it will be observable at 11 mag for a long time from 2017 autumn to 2018 winter. In the Northern Hemisphere, it will appear in the morning sky in August. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 4 33.52 -7 6.8 4.781 4.100 43 13.5 5:38 (261, 25) July 8 4 40.05 -6 31.2 4.681 4.049 46 13.4 5:37 (257, 28) 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 11.2 mag still now (June 30, Chris Wyatt). It stays observable in good condition after this until the comet fades out. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 18 12.75 -3 5.1 0.471 1.466 158 13.8 23:34 (180, 58) July 8 18 10.54 -6 14.6 0.532 1.524 158 14.7 23:04 (180, 61) 65P/Gunn Now it is 14.1 mag (June 30, Chris Wyatt). It stays 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) July 1 15 44.92 -22 4.7 2.110 2.960 139 14.1 21:06 (180, 77) July 8 15 43.25 -22 15.3 2.167 2.954 132 14.1 20:37 (180, 77) 213P/Van Ness Now it is bright as 13.6 mag (June 30, Chris Wyatt). It was expected to brighten up to 12 mag in summer. But actually, it is fainter than expected. It is observable in excellent condition in the Southern Hemisphere. It locates somewhat low in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 19 16.21 -32 2.0 1.085 2.090 167 14.4 0:42 (180, 87) July 8 19 10.21 -31 28.1 1.063 2.074 171 14.1 0:08 (180, 86) 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) July 1 0 41.82 41 50.5 3.408 3.285 74 14.3 5:38 (185, 13) July 8 0 42.77 44 41.0 3.313 3.270 78 14.2 5:37 (180, 10) C/2015 O1 ( PanSTARRS ) Now it is 14.7 mag (June 30, Chris Wyatt). 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) July 1 17 29.97 22 52.7 3.520 4.256 130 14.5 22:50 (180, 32) July 8 17 17.93 23 21.2 3.539 4.228 126 14.4 22:11 (180, 32) C/2016 M1 ( PanSTARRS ) Now it is 15.9 mag (June 9, 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) July 1 17 59.37 52 57.3 4.447 4.786 103 15.0 23:19 (180, 2) July 8 17 49.52 52 4.7 4.388 4.729 103 15.0 22:42 (180, 3) 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). In the Southern Hemisphere, it stays observable for a long time, but it stays low. It will be getting higher slowly also in the Northern Hemisphere, but it stays extremely low for a while. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 3 14.11 7 59.2 2.080 1.651 51 15.4 5:38 (234, 30) July 8 3 26.94 8 5.0 2.111 1.741 55 15.7 5:37 (230, 32) C/2011 KP36 ( Spacewatch ) Now it is 15.6 mag (Mar. 6, Kunihiro Shima). It is appearing in the morning sky. 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) July 1 3 8.46 4 50.7 6.199 5.662 54 15.5 5:38 (235, 33) July 8 3 13.30 4 51.3 6.137 5.687 59 15.5 5:37 (230, 36) C/2017 D2 ( Barros ) Now it is 17.5 mag (June 16, Kunihiro Shima). It will brighten up to 15.5 mag in summer. It will be observable in excellent condition in the Southern Hemisphere. It will be getting higher gradually in the morning sky also in the Northern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 22 7.50 -36 12.1 1.677 2.489 133 15.6 3:32 ( 0, 89) July 8 22 4.92 -35 15.0 1.621 2.485 139 15.5 3:02 ( 0, 90) C/2016 N6 ( PanSTARRS ) Now it is 15.9 mag (June 11, Kunihiro Shima). 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) July 1 16 17.16 61 40.0 4.503 4.626 90 15.7 21:37 (180, -7) July 8 16 1.55 61 19.8 4.493 4.574 88 15.7 20:54 (180, -6) 352P/2017 L1 ( Skiff ) First return of a new periodic comet discovered in 2000. Now it is 17.8 mag (June 16, Kunihiro Shima). 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) July 1 0 52.11 -13 9.7 2.283 2.537 92 15.9 5:38 (204, 66) July 8 0 58.87 -12 24.8 2.208 2.540 96 15.9 5:37 (191, 67) C/2015 V1 ( PanSTARRS ) Now it is 16.0 mag (June 16, Kunihiro Shima). It stays observable at 16 mag for a long time from 2017 to 2018. It is getting higher gradually in the morning sky. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 2 44.00 31 33.7 5.040 4.493 52 16.0 5:38 (212, 15) July 8 2 44.82 31 21.8 4.920 4.475 58 16.0 5:37 (207, 17) 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) July 1 16 49.56 -36 41.5 2.361 3.298 152 16.0 22:11 ( 0, 88) July 8 16 46.25 -35 55.7 2.358 3.254 146 16.0 21:40 ( 0, 89) 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) July 1 1 13.93 8 27.9 2.835 2.821 78 16.1 5:38 (201, 44) July 8 1 20.42 9 33.0 2.748 2.823 83 16.0 5:37 (194, 44) 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) July 1 2 24.91 4 25.9 1.871 1.696 64 16.2 5:38 (225, 40) July 8 2 35.39 5 8.5 1.867 1.760 67 16.4 5:37 (220, 42) C/2014 OE4 ( PanSTARRS ) Now it is 16.2 mag (June 9, Kunihiro Shima). 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) July 1 18 27.59 65 31.4 6.292 6.397 91 16.4 23:47 (180,-11) July 8 18 20.65 65 51.8 6.306 6.407 91 16.4 23:13 (180,-11) 81P/Wild 2 It brightened up to 11 mag from spring to summer in 2016. Now it is 16.3 mag (June 1, Alexander Baransky). It stays observable for a long time after this, but it will be fainter than 18 mag in October. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 20 15.94 -18 4.8 2.290 3.250 156 16.4 1:41 (180, 73) July 8 20 10.00 -18 27.5 2.294 3.287 165 16.5 1:08 (180, 73) 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) July 1 0 14.46 -65 32.9 2.395 2.952 113 16.6 5:38 ( 0, 60) July 8 0 33.54 -67 28.4 2.329 2.896 114 16.5 5:29 ( 0, 58) (457175) 2008 GO98 Hilda-type minor planet, but the cometary activity was detected on July 3. Now it is bright as 16.5 mag (July 3, G. J. Leonard). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 21 29.09 3 54.4 2.516 3.270 130 16.6 2:54 (180, 51) July 8 21 26.86 3 56.8 2.468 3.287 137 16.6 2:24 (180, 51) P/2017 M2 ( LINEAR-NEAT ) Now it is 19.1 mag (June 22, Erwin Schwab, Pablo Ruiz). Return of a new periodic comet which brightened up to 13 mag in 2004. 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) July 1 0 52.87 -7 53.4 1.673 1.959 90 17.1 5:38 (200, 61) July 8 1 5.77 -6 51.4 1.584 1.931 93 16.8 5:37 (193, 61) C/2016 B1 ( NEOWISE ) Now it is 15.8 mag (June 14, Kunihiro Shima). 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) July 1 17 59.17 26 58.0 3.037 3.760 128 16.9 23:20 (180, 28) July 8 17 55.01 27 22.4 3.094 3.794 127 17.0 22:48 (180, 28) 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) July 1 22 17.88 -21 24.2 1.135 1.949 129 17.0 3:43 (180, 76) July 8 22 3.91 -22 33.0 1.140 2.025 139 17.0 3:01 (180, 77) 145P/Shoemaker-Levy 5 Now it is 18.4 mag (May 31, iTelescope Observatory, Siding Spring). It will brighten rapidly, up to 15 mag in autumn, and will be observable in good condition in the Northern Hemisphere. It locates low in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 2 20.90 10 50.9 2.236 1.986 62 17.5 5:38 (219, 35) July 8 2 35.48 12 30.6 2.162 1.969 65 17.3 5:37 (215, 35) 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 16.8 mag (June 14, Kunihiro Shima). Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 16 7.49 -14 52.8 4.481 5.330 143 17.4 21:29 (180, 70) July 8 16 2.98 -15 25.8 4.608 5.382 135 17.6 20:57 (180, 71) 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) July 1 12 43.11 -29 59.8 5.623 5.919 102 17.5 18:29 (133, 83) July 8 12 45.62 -29 2.6 5.727 5.921 96 17.5 18:32 (115, 78) 189P/NEAT Now it is 18.4 mag (May 26, iTelescope Observatory, Siding Spring). It brightens up to 16.5-17 mag in August, and it will be observable in good condition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 14 44.69 -35 24.1 0.380 1.286 128 17.8 20:07 ( 0, 90) July 8 15 0.98 -29 25.5 0.367 1.261 124 17.5 19:56 (180, 84) C/2017 B3 ( LINEAR ) Now it is 17.4 mag (June 16, Kunihiro Shima). 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 will be too low to observe soon, then it will never be observable again. It will be unobservable temporarily from September to October also in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 11 57.14 -26 27.9 6.101 6.208 91 17.6 18:29 (115, 73) July 8 11 58.28 -26 32.5 6.162 6.166 85 17.5 18:32 (105, 67) C/2017 M4 ( ATLAS ) Now it is 17.2 mag (June 26, D. Briggs). It is expected to brighten up to 13-14 mag from 2018 to 2019. In the Northern Hemisphere, it stays observable in good condition for a long time. In the Southern Hemisphere, it is not observable until summer in 2018. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 21 24.19 69 50.3 6.037 5.991 82 17.7 2:48 (180,-15) July 8 21 8.87 70 20.2 5.949 5.943 84 17.6 2:06 (180,-15) 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) July 1 14 12.32 -11 16.8 1.844 2.460 115 17.7 19:34 (180, 66) July 8 14 13.76 -11 44.8 1.892 2.427 109 17.6 19:08 (180, 67) 96P/Machholz 1 Now it is 19.7 mag (Apr. 27, iTelescope Observatory, Siding Spring). It will pass the perihelion on Oct. 27. In the Southern Hemisphere, it stays observable while the comet will be brightening, until early October when the comet will brighten up to 9 mag. In the Northern Hemisphere, it is not observable at all in this apparition. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 22 32.43 -61 35.3 1.557 2.299 125 18.0 3:57 ( 0, 64) July 8 22 28.11 -65 42.4 1.452 2.213 126 17.6 3:25 ( 0, 60) (944) Hidalgo It will brighten up to 14 mag from autumn to winter in 2018, and it will be observable in excellent condition in the Northern Hemisphere. In 2017, it is observable at 17 mag in excellent condition in the Southern Hemisphere. Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h) July 1 0 26.48 -40 25.1 4.049 4.456 107 17.8 5:38 (336, 84) July 8 0 27.86 -40 57.8 3.933 4.416 111 17.7 5:24 ( 0, 84) 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) July 1 22 31.02 -34 2.0 4.750 5.444 128 17.7 3:55 (180, 89) July 8 22 29.35 -34 6.9 4.702 5.466 134 17.7 3:26 (180, 89) C/2013 X1 ( PanSTARRS ) It brightened up to 6.2 mag in June in 2016 (June 24, Marco Goiato). Now it is 16.8 mag (June 16, Kunihiro Shima). 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) July 1 12 24.27 -20 56.5 5.145 5.326 94 17.8 18:29 (143, 73) July 8 12 23.89 -20 26.2 5.328 5.390 88 17.9 18:32 (127, 68) 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 17.9 mag still now (June 9, Kunihiro Shima). 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) July 1 15 2.53 31 19.9 7.700 8.019 104 17.9 20:24 (180, 24) July 8 15 0.73 31 14.8 7.812 8.050 99 17.9 19:55 (180, 24)