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Now it is very bright as 9.5 mag (Jan. 4, Neil Norman). It is approaching to Earth down to 0.2 a.u. now. In the Northern Hemisphre, it stays observable in good condition until January, but it will be extremely low after that. In the Southern Hemisphere, it is not observable from January to mid March, but it stays observable in good condition except for that period.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 4 4.99 68 14.0 0.226 1.133 126 10.2 21:02 (176,-14)
Jan. 13 23 7.98 52 34.9 0.331 1.022 87 10.7 20:59 (138,-22)
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Now it is very bright as 10.4 mag (Dec. 15, Marco Goiato). It is observable in good condition in the Northern Hemisphere. It locates low in the Southern Hemisphere. It will be fading after January.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 13 26.49 3 6.2 1.187 1.496 86 11.1 3:08 (241, 30)
Jan. 13 13 41.03 2 29.6 1.167 1.526 90 11.3 3:16 (237, 34)
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Now it is bright as 10.5 mag (Jan. 6, Neil Norman). It will stay bright as 11 mag for a long time until spring. In the Southern Hemisphere, it stays observable in good condition until February. In the Northern Hemispehre, it stays observable for a long time after this until the comet fades out.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 4 18.51 15 37.3 2.089 2.910 139 11.2 21:14 (180, 39)
Jan. 13 4 11.67 17 41.6 2.129 2.878 131 11.2 20:59 (174, 37)
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Now it is 13.8 mag (Jan. 1, Ken-ichi Kadota). It will brighten very rapidly, and brighten up to 11 mag from January to February. In the Northern Hemisphere, it stays observable for a long time in the evening sky. In the Southern Hemisphere, it locates extremely low at the highlight.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 21 47.58 -8 46.5 1.491 0.987 40 12.3 21:02 ( 81, 2)
Jan. 13 22 17.47 -7 29.0 1.449 0.959 41 11.8 20:59 ( 82, 2)
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It brightened up to 8.1 mag in autumn (Oct. 3, Juan Jose Gonzalez). Now it is fading. It has already faded down to 12.2 mag (Dec. 23, Carlos Labordena). It is observable all night in the Northern Hemisphere. In the Northern Hemisphere, it stays observable in excellent condition for a long time. In the Southern Hemisphere, it will never be observable again after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 0 39.95 85 29.4 1.281 1.884 111 12.3 21:02 (176,-32)
Jan. 13 1 37.67 85 7.2 1.352 1.941 111 12.7 20:59 (176,-31)
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Now it is 12.0 mag (Dec. 18, Seiichi Yoshida). It is observable in good condition in the Northern Hemisphere. It locates very low for a long time in the Southern Hemisphere. It will be fading after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 14 54.85 -5 47.5 1.502 1.369 62 13.0 3:08 (264, 19)
Jan. 13 15 12.72 -7 2.9 1.507 1.413 65 13.6 3:16 (262, 23)
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Now it is 13.6 mag (Dec. 18, Toshihiko Ikemura, Hirohisa Sato). It is expected to brighten up to 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)
Jan. 6 15 44.29 54 39.7 3.207 3.330 88 13.3 3:08 (219,-25)
Jan. 13 15 46.40 56 50.3 3.103 3.289 92 13.2 3:16 (215,-21)
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It brightened up to 7.1 mag from May to June (June 21, Juan Jose Gonzalez). Now it is fading. It has already faded down to 13.5 mag (Jan. 5, Chris Wyatt). In the Southern Hemisphere, it stays observable for a long time after this. It will never be observable again in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 21 17.05 -54 3.2 3.756 3.068 39 13.3 21:02 ( 38, 21)
Jan. 13 21 35.36 -53 15.2 3.838 3.134 38 13.4 20:59 ( 38, 20)
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Now it is 14.7 mag (Dec. 15, Toshihiko Ikemura, Hirohisa Sato).
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 21 38.77 -11 31.1 6.545 5.800 37 13.8 21:02 ( 77, 1)
Jan. 13 21 43.75 -11 2.9 6.609 5.799 32 13.8 20:59 ( 74, -3)
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Now it is 13.7 mag (Nov. 14, Gabor Santa). It is expected to brighten up to 10 mag in summer in 2018. In the Northern Hemisphere, it stays observable until 2018 summer while the comet will be brightening. However, it will be extremely low from December to January. 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)
Jan. 6 18 22.44 7 23.8 4.057 3.264 31 13.9 3:08 (284,-31)
Jan. 13 18 29.39 6 26.7 3.995 3.210 32 13.8 3:16 (280,-25)
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Now it is 14.0 mag (Jan. 5, Chris Wyatt). It stays 14 mag for a while. In the Southern Hemisphere, it stays observable in good condition until spring in 2018. It is getting higher gradually also in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 1 52.51 -40 43.1 1.858 2.003 83 14.1 21:02 ( 69, 63)
Jan. 13 2 0.29 -35 40.8 1.890 2.006 82 14.2 20:59 ( 79, 60)
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Now it is 14.2 mag (Nov. 14, Artyom Novichonok). It will be observable at 14 mag for a long time from 2017 to 2018. In the Southern Hemisphere, it will be hardly observable after this. It will be extremely low from November to December in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 16 33.77 23 57.8 4.152 3.750 59 14.4 3:08 (253,-18)
Jan. 13 16 35.42 25 17.7 4.064 3.744 64 14.3 3:16 (248,-12)
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Brian Skiff found a bright outburst on Dec. 7. It brightened up to 13.2 mag (Dec. 11, Seiichi Yoshida). It stays bright as 13.3 mag still now (Dec. 20, Toshihiko Ikemura, Hirohisa Sato). This is the 4th outburst following those in January 2006, May 2011 and August 2016. It stays observable in good condition for a while.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 2 35.29 11 16.4 6.904 7.368 114 15.4 21:02 (151, 39)
Jan. 13 2 35.40 11 19.5 7.030 7.386 107 15.8 20:59 (144, 36)
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It brightened very rapidly up to 13.8 mag in August (Aug. 22, kunihiro Shima). After that, it is fading gradually. Now it is 15.0 mag (Dec. 19, Martin Masek). It is observable in excellent condition in the Southern Hemisphere. It stays low for a while in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 0 23.85 -17 20.1 2.434 2.358 73 15.4 21:02 ( 95, 38)
Jan. 13 0 31.98 -15 13.7 2.490 2.337 69 15.5 20:59 ( 95, 33)
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Now it is 15.6 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 15-16 mag for a long time from 2017 to 2018.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 0 10.78 -0 41.3 4.385 4.270 76 15.5 21:02 (109, 25)
Jan. 13 0 10.58 -1 24.0 4.518 4.272 69 15.6 20:59 (104, 21)
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Now it is 15.6 mag (Dec. 19, Toshihiko Ikemura, Hirohisa Sato). It brightened rapidly. It is 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)
Jan. 6 5 0.18 39 54.4 1.320 2.217 148 15.5 21:56 (180, 15)
Jan. 13 4 58.48 39 32.3 1.391 2.247 141 15.7 21:27 (180, 15)
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Now it is 16.5 mag (Dec. 18, Toshihiko Ikemura, Hirohisa 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)
Jan. 6 10 34.05 4 19.3 8.959 9.579 126 15.9 3:08 (190, 50)
Jan. 13 10 33.48 4 30.6 8.872 9.582 134 15.9 3:05 (180, 51)
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Now it is 15.0 mag (Nov. 22, Sandor Szabo). It stays 17 mag in 2018.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 3 12.59 -0 55.4 5.886 6.413 118 15.9 21:02 (157, 54)
Jan. 13 3 12.50 -0 42.0 6.013 6.443 111 16.0 20:59 (148, 51)
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Now it is 15.3 mag (Dec. 17, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this. In the Northern Hemisphere, it stays observable in the northern sky for a long time. It is not observable at all after this in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 20 11.98 62 39.5 3.291 3.372 86 15.9 21:02 (146,-44)
Jan. 13 20 19.35 63 19.5 3.330 3.394 85 16.0 20:59 (148,-45)
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Now it is 15.6 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It stays 16 mag for a long time from 2017 to 2018. It is observable in excellent condition in the Northern Hemisphere. It locates very low in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 8 40.91 34 38.5 4.424 5.338 156 16.0 1:41 (180, 20)
Jan. 13 8 32.40 36 3.7 4.401 5.341 161 16.0 1:05 (180, 19)
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Now it is 15.6 mag (Nov. 22, Sandor Szabo). It stays observable at 16 mag for a long time until summer in 2018. It is observable in good condition in the Northern Hemisphere in 2017, and in the Southern Hemisphere in 2018. Mikhail Maslov reported that it looks bright as 13 mag with a large coma by his photo on Dec. 19.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 22 53.38 21 5.5 1.755 1.700 70 16.0 21:02 (114, -3)
Jan. 13 22 50.80 17 37.9 1.889 1.662 61 16.1 20:59 (107, -6)
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Now it is 16.5 mag (Dec. 15, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 9 mag in 2018 summer. However, it is hardly observable when it is bright. In the Northern Hemisphere, it is observable only until March when it brightens up to 14 mag. In the Southern Hemisphere, it is observable from July to September in 2018, but it locates in extremely low.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 22 50.32 55 19.6 2.891 3.073 91 16.2 21:02 (143,-22)
Jan. 13 23 2.90 53 6.8 2.877 2.990 86 16.1 20:59 (140,-23)
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It brightened up to 12.2 mag in August (Aug. 21, Juan Jose Gonzalez). It is fading now. It has already faded down to 15.5 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato).
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 7 48.20 15 39.1 1.360 2.331 168 16.3 0:48 (180, 39)
Jan. 13 7 39.83 16 43.8 1.406 2.388 175 16.5 0:13 (180, 38)
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Now it is 16.5 mag (Dec. 17, Toshihiko Ikemura, Hirohisa Sato). It will be observable at 16 mag in good condition from winter to spring.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 11 58.12 8 27.7 3.093 3.537 109 16.3 3:08 (216, 40)
Jan. 13 11 59.91 8 32.8 2.998 3.537 115 16.3 3:16 (206, 43)
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Now it is 16.0 mag (Dec. 19, Toshihiko Ikemura, Hirohisa Sato). 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)
Jan. 6 19 4.85 39 45.7 5.127 4.751 62 16.3 3:08 (248,-53)
Jan. 13 19 9.51 39 15.9 5.102 4.707 61 16.3 3:16 (248,-47)
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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 never be observable again.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 13 57.14 -48 1.3 5.476 5.141 65 16.5 3:08 (306, 46)
Jan. 13 14 1.23 -49 28.5 5.357 5.104 69 16.4 3:16 (308, 52)
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Now it is 16.8 mag (Dec. 20, Toshihiko Ikemura, Hirohisa Sato). It will be observable at 16.5 mag in good condition in winter.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 9 58.50 -12 11.7 2.250 2.932 125 16.6 2:58 (180, 67)
Jan. 13 9 56.57 -13 18.3 2.222 2.963 131 16.7 2:28 (180, 68)
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Now it is 16.5 mag (Dec. 18, Toshihiko Ikemura, Hirohisa Sato). It will pass the perihelion in 2019. However, it has not been brightening since the discovery in 2010. It is observable in good conditioin in the Northern Hemisphere. It is not observable for a long time in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 6 14.06 76 48.5 8.190 8.796 125 16.8 23:11 (180,-22)
Jan. 13 6 5.49 76 50.2 8.202 8.784 123 16.8 22:35 (180,-22)
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Return of a new periodic comet which brightened up to 13 mag in 2004. It brightened rapidly up to 14.3 mag (Nov. 15, Catalina Sky Survey). Now it is fading. It has already faded down to 16.5 mag (Dec. 17, Toshihiko Ikemura, Hirohisa Sato).
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 2 34.57 21 4.8 1.220 1.887 117 16.8 21:02 (156, 30)
Jan. 13 2 42.87 22 13.9 1.307 1.913 112 17.1 20:59 (152, 27)
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Now it is 17.1 mag (Dec. 21, Katsumi Yoshimoto). It stays observable at 17 mag in good condition for a while. It will be fainter than 18 mag in May.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 14 23.33 -6 34.6 2.369 2.230 69 16.9 3:08 (260, 25)
Jan. 13 14 33.79 -7 4.8 2.319 2.261 74 16.9 3:16 (256, 31)
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Now it is 16.9 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). In the Northern Hemisphere, it will be observable at 17 mag in excellent condition from autumn to winter. It locates low in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 5 5.63 35 37.9 2.397 3.290 150 16.9 22:02 (180, 19)
Jan. 13 5 2.71 35 22.3 2.466 3.310 143 17.0 21:31 (180, 20)
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Now it is 16.9 mag (Dec. 13, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and it will be fainter than 18 mag in March.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 1 7.35 18 7.3 2.777 3.056 97 17.0 21:02 (134, 22)
Jan. 13 1 12.67 18 32.2 2.887 3.071 91 17.1 20:59 (131, 19)
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It brightened up to 6.2 mag in April (Apr. 7, Juan Jose Gonzalez). Now it is fading rapidly. It has already faded down to 15.5 mag (Dec. 20, Thomas Lehmann). It stays observable for a long time after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 2 42.88 15 29.0 2.940 3.507 117 17.0 21:02 (155, 36)
Jan. 13 2 44.17 15 29.2 3.112 3.583 110 17.3 20:59 (149, 34)
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Now it is 18.2 mag (Dec. 19, Toshihiko Ikemura, Hirohisa Sato). It will be fading slowly after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 12 2.47 -13 36.7 2.681 2.998 99 17.4 3:08 (237, 57)
Jan. 13 12 2.54 -13 56.3 2.629 3.048 105 17.4 3:16 (225, 63)
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Now it is 16.9 mag (Dec. 22, Toshihiko Ikemura, Hirohisa Sato). It stays observable at 18 mag for a long time until 2019.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 6 8.58 18 0.2 7.002 7.959 165 17.7 23:04 (180, 37)
Jan. 13 6 2.78 17 47.7 7.037 7.955 157 17.7 22:31 (180, 37)
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Now it is 17.8 mag (Nov. 23, H. Nohara). It was observed at 17 mag in former 2017. It will be observable at 18 mag in good condition from winter to spring.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Jan. 6 12 54.23 4 25.6 5.172 5.341 94 17.8 3:08 (233, 35)
Jan. 13 12 53.12 5 30.6 5.065 5.360 102 17.8 3:16 (223, 40)
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