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Now it is bright as 10.0 mag (Dec. 5, Juan Jose Gonzalez). 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. It started fading before the peirhelion passage.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 16 23 44.68 86 25.5 1.083 1.729 113 10.4 20:57 (177,-32)
Dec. 23 23 35.06 86 1.6 1.147 1.777 112 10.6 21:01 (176,-33)
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Now it is very bright as 10.7 mag (Dec. 13, Chris Wyatt). It approached to Earth down to 0.07 a.u. on Dec. 16. It will fade out and get lower rapidly after Dec. 18. It will be 18 mag and unobservable in late December. In the Southern Hemisphere, it stays low.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 16 1 24.67 35 36.6 0.071 1.027 125 10.5 20:57 (157, 19)
Dec. 23 21 34.63 -12 48.2 0.131 0.907 50 14.7 21:01 ( 81, 12)
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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)
Dec. 16 12 34.78 5 51.8 1.245 1.424 78 10.6 2:53 (247, 20)
Dec. 23 12 53.27 4 48.1 1.225 1.444 80 10.7 2:56 (246, 23)
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Now it is bright as 10.8 mag (Dec. 14, Chris Wyatt). It will stay bright as 11 mag for a long time from winter to next 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)
Dec. 16 4 44.35 9 30.5 2.062 3.013 161 11.4 23:02 (180, 45)
Dec. 23 4 35.16 11 29.4 2.054 2.978 155 11.3 22:26 (180, 43)
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Now it is 11.2 mag (Dec. 4, Thomas Lehmann). 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)
Dec. 16 13 53.94 -1 0.9 1.479 1.265 57 11.4 2:53 (265, 8)
Dec. 23 14 15.44 -2 46.3 1.488 1.295 59 11.9 2:56 (266, 11)
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Now it is 13.5 mag (Dec. 14, Chris Wyatt). It will approach to Earth down to 0.2 a.u., and to Sun down to 0.6 a.u., and it is expected to brighten up to 10-11 mag from winter to spring. 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)
Dec. 16 8 52.58 5 22.0 0.632 1.466 128 13.2 2:53 (188, 50)
Dec. 23 8 40.83 14 7.7 0.438 1.356 142 12.2 2:36 (180, 41)
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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 (Dec. 7, 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)
Dec. 16 20 17.48 -56 2.0 3.490 2.869 44 12.8 20:57 ( 38, 26)
Dec. 23 20 38.08 -55 27.6 3.582 2.935 42 13.0 21:01 ( 38, 24)
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It brightened very rapidly from July to August. Now it is very bright as 14.2 mag (Nov. 8, Chris Wyatt). 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)
Dec. 16 0 4.07 -23 27.4 2.266 2.428 87 13.3 20:57 ( 99, 55)
Dec. 23 0 9.81 -21 27.5 2.322 2.404 82 13.3 21:01 ( 97, 48)
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Now it is 16.2 mag (Dec. 9, 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)
Dec. 16 20 27.11 -11 23.4 1.620 1.121 42 13.9 20:57 ( 80, 5)
Dec. 23 20 52.36 -10 43.7 1.578 1.070 41 13.3 21:01 ( 79, 3)
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Now it is 14.0 mag (Nov. 28, 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)
Dec. 16 15 33.78 49 56.9 3.527 3.458 77 13.8 2:53 (230,-35)
Dec. 23 15 37.74 51 13.9 3.421 3.415 81 13.6 2:56 (227,-32)
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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)
Dec. 16 21 25.09 -12 46.2 6.302 5.804 55 13.7 20:57 ( 86, 17)
Dec. 23 21 29.40 -12 22.9 6.391 5.803 49 13.8 21:01 ( 83, 11)
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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)
Dec. 16 18 1.84 10 40.7 4.189 3.426 34 14.2 20:57 ( 75,-38)
Dec. 23 18 8.63 9 30.4 4.154 3.371 32 14.1 21:01 ( 69,-42)
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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 14.0 mag still now (Dec. 13, Chris Wyatt). 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)
Dec. 16 2 37.55 11 20.6 6.570 7.315 136 14.4 20:57 (180, 44)
Dec. 23 2 36.38 11 17.0 6.673 7.333 129 14.7 21:01 (169, 43)
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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)
Dec. 16 16 26.86 21 0.5 4.373 3.774 47 14.5 2:53 (268,-35)
Dec. 23 16 29.40 21 49.8 4.308 3.765 50 14.5 2:56 (263,-30)
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Now it is 15.8 mag (Dec. 13, 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)
Dec. 16 5 14.85 40 14.7 1.170 2.130 162 15.1 23:33 (180, 15)
Dec. 23 5 8.66 40 18.3 1.209 2.158 159 15.2 23:00 (180, 15)
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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)
Dec. 16 0 16.08 2 13.8 3.975 4.267 100 15.3 20:57 (131, 40)
Dec. 23 0 13.44 1 6.6 4.111 4.267 92 15.4 21:01 (122, 35)
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It brightened up to 10 mag from spring to summer. Now it is fading. It has already faded down to 14.7 mag (Dec. 13, Thomas Lehmann). 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)
Dec. 16 22 2.20 -20 25.7 2.476 2.190 61 15.3 20:57 ( 84, 29)
Dec. 23 22 15.62 -18 54.1 2.584 2.229 58 15.6 21:01 ( 83, 24)
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Now it is 14.0 mag (Dec. 13, Chris Wyatt). It stays 14-15 mag until 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)
Dec. 16 1 33.39 -55 12.4 1.822 2.015 86 15.4 20:57 ( 24, 67)
Dec. 23 1 38.88 -50 33.3 1.825 2.007 85 15.4 21:01 ( 40, 68)
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Now it is 16.5 mag (Nov. 28, 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)
Dec. 16 11 48.00 8 45.5 3.397 3.540 90 15.6 2:53 (237, 26)
Dec. 23 11 52.11 8 34.2 3.293 3.539 96 15.6 2:56 (231, 31)
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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)
Dec. 16 8 11.13 12 33.3 1.303 2.160 141 15.6 2:34 (180, 43)
Dec. 23 8 4.35 13 31.0 1.310 2.217 150 15.8 1:59 (180, 42)
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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)
Dec. 16 3 15.59 -1 16.8 5.552 6.322 138 15.7 21:35 (180, 56)
Dec. 23 3 14.16 -1 13.1 5.654 6.352 131 15.8 21:06 (180, 56)
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Now it is 14.8 mag (Nov. 14, Gabor Santa). In the Northern Hemisphere, it stays 15 mag until winter, and it is observable in excellent condition. 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)
Dec. 16 19 54.34 61 55.7 3.169 3.314 89 15.7 20:57 (146,-35)
Dec. 23 19 59.38 61 57.4 3.211 3.332 88 15.8 21:01 (145,-39)
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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.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 16 23 18.33 36 58.1 1.375 1.836 100 15.8 20:57 (142, 5)
Dec. 23 23 5.72 30 35.7 1.491 1.787 90 15.9 21:01 (131, 3)
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Now it is 16.3 mag (Nov. 15, 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)
Dec. 16 10 33.96 3 58.3 9.265 9.572 105 16.0 2:53 (223, 42)
Dec. 23 10 34.30 4 3.1 9.157 9.574 112 15.9 2:56 (214, 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)
Dec. 16 9 1.50 30 14.9 4.605 5.330 133 16.1 2:53 (187, 24)
Dec. 23 8 55.56 31 42.1 4.527 5.332 141 16.0 2:50 (180, 23)
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It brightened rapidly. Now it is bright as 14.8 mag (Nov. 22, Sandor Szabo). Return of a new periodic comet which brightened up to 13 mag in 2004. It is be observable in excellent condition in autumn. It continues brightening even after the perihelion passage.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 16 2 17.89 17 21.8 0.989 1.816 133 16.1 20:57 (174, 37)
Dec. 23 2 21.91 18 38.4 1.060 1.838 128 16.3 21:01 (166, 35)
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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 13.5 mag (Nov. 14, Sandor Szabo). It stays observable for a long time after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 16 2 44.78 15 59.5 2.464 3.277 139 16.2 21:04 (180, 39)
Dec. 23 2 43.10 15 43.7 2.614 3.354 132 16.5 21:01 (172, 39)
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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)
Dec. 16 22 14.54 62 21.3 2.973 3.319 101 16.6 20:57 (153,-21)
Dec. 23 22 26.05 59 58.1 2.938 3.238 98 16.4 21:01 (149,-21)
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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)
Dec. 16 0 56.44 17 19.1 2.459 3.014 115 16.6 20:57 (151, 32)
Dec. 23 0 59.15 17 30.4 2.562 3.028 108 16.7 21:01 (144, 29)
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Now it is 17.1 mag (Nov. 27, 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)
Dec. 16 9 58.10 -8 1.4 2.380 2.846 108 16.6 2:53 (222, 56)
Dec. 23 9 59.31 -9 31.8 2.331 2.874 113 16.6 2:56 (211, 61)
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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)
Dec. 16 13 42.67 -43 53.1 5.813 5.252 51 16.7 2:53 (304, 31)
Dec. 23 13 47.79 -45 13.5 5.704 5.214 55 16.7 2:56 (304, 36)
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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)
Dec. 16 5 19.49 36 3.4 2.265 3.231 166 16.8 23:38 (180, 19)
Dec. 23 5 14.24 35 59.6 2.296 3.250 163 16.8 23:05 (180, 19)
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Now it is 17.0 mag (Nov. 27, Toshihiko Ikemura, Hirohisa Sato). 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)
Dec. 16 13 48.03 -4 26.6 2.503 2.142 57 16.8 2:53 (267, 11)
Dec. 23 14 0.39 -5 15.4 2.461 2.170 61 16.8 2:56 (266, 16)
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Now it is 16.6 mag (Nov. 28, 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)
Dec. 16 6 39.87 76 7.0 8.209 8.831 126 16.8 1:04 (180,-21)
Dec. 23 6 31.70 76 26.9 8.193 8.819 126 16.8 0:29 (180,-21)
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Now it is 17.8 mag (Nov. 20, 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)
Dec. 16 11 55.87 -11 58.3 2.838 2.842 80 17.3 2:53 (257, 38)
Dec. 23 11 59.09 -12 37.1 2.787 2.895 86 17.3 2:56 (252, 44)
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Now it is 17.0 mag (Dec. 13, 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)
Dec. 16 6 26.60 18 37.7 7.009 7.971 166 17.7 0:49 (180, 36)
Dec. 23 6 20.60 18 25.3 6.988 7.967 173 17.7 0:16 (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)
Dec. 16 12 53.82 1 47.1 5.497 5.284 72 17.9 2:53 (254, 19)
Dec. 23 12 54.49 2 33.8 5.390 5.302 79 17.9 2:56 (248, 24)
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