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Now it is 12.8 mag (Jan. 16, Vance Petriew). It will 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)
Feb. 3 23 54.84 -2 32.4 1.351 0.939 43 11.0 18:56 ( 68, 24)
Feb. 10 0 29.11 -0 39.3 1.334 0.955 45 11.0 19:02 ( 70, 25)
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Now it is bright as 11.0 mag (Jan. 19, Sandor Szabo). It will stay bright as 11 mag for a long time until spring. In the Southern Hemisphere, it will be unobservable in March. 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)
Feb. 3 3 59.44 23 38.6 2.315 2.792 108 11.3 19:06 ( 0, 79)
Feb. 10 3 58.33 25 30.6 2.392 2.766 101 11.3 19:02 ( 32, 79)
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Now it is very bright as 10.1 mag (Jan. 17, Maik Meyer). It will go far away from Earth after this. But it will approach to Sun down to 0.58 a.u. on Feb. 21. In the Northern Hemisphere, it will be getting lower rapidly after this, and it will be extremely low in February. In the Southern Hemisphere, it is not observable until late March.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 21 52.24 26 59.0 0.841 0.713 45 11.5 18:56 (112, 15)
Feb. 10 21 44.83 22 43.7 1.003 0.637 37 11.5 19:02 (114, 5)
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It brightened up to 9.2 mag from November to December (Nov. 16, Juan Jose Gonzalez). Now it is fading. But it is bright as 12.5 mag still now (Jan. 20, Chris Wyatt). It stays observable in good condition until summer when it fades out.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 14 14.80 1 42.0 1.106 1.633 102 12.1 5:23 ( 0, 57)
Feb. 10 14 22.36 1 46.4 1.086 1.673 107 12.4 5:03 ( 0, 57)
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Now it is 13.1 mag (Jan. 17, 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 October.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 15 42.34 65 14.1 2.827 3.171 101 12.8 5:31 (195, 58)
Feb. 10 15 33.99 68 34.3 2.753 3.133 103 12.6 5:26 (188, 56)
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Now it is 14.1 mag (Dec. 13, Kunihiro Shima). 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. In the Southern Hemisphere, it will appear in the morning sky in late February, then it will be observable in good condition.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 18 49.97 3 55.3 3.753 3.054 39 13.5 5:31 (280, 21)
Feb. 10 18 56.60 3 9.5 3.653 3.003 42 13.4 5:26 (284, 24)
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It approached to Earth down to 0.07 a.u. in mid December, and it brightened up to 10.4 mag (Dec. 15, Thomas Lehmann). It approaches to Sun down to 0.14 a.u. on Jan. 25, but it is not observable.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 21 16.57 -10 7.3 1.309 0.353 7 13.6 18:56 ( 86,-12)
Feb. 10 22 1.63 -3 29.5 1.451 0.538 13 14.9 19:02 ( 90, -6)
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It brightened up to 7.1 mag from May to June in 2017 (June 21, Juan Jose Gonzalez). Now it is fading. It has already faded down to 12.9 mag (Jan. 17, Chris Wyatt). In the Southern Hemisphere, it stays observable for a long time after this. However, it will be extremely low from January to March. It will never be observable again in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 22 25.79 -50 40.3 4.060 3.334 37 13.7 18:56 ( 42,-21)
Feb. 10 22 41.19 -49 47.9 4.125 3.400 37 13.9 19:02 ( 45,-23)
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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 14.2 mag (Jan. 15, Toshihiko Ikemura, Hirohisa Sato). 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)
Feb. 3 4 29.20 82 5.6 1.583 2.124 109 13.8 19:41 (180, 43)
Feb. 10 5 9.85 80 26.5 1.668 2.188 108 14.1 19:53 (180, 45)
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It is not observable now. It will appear in the morning sky in late March in the Southern Hemisphere, or in late April in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 21 59.46 -9 30.3 6.743 5.796 15 13.9 18:56 ( 81, -3)
Feb. 10 22 4.84 -8 57.2 6.766 5.795 9 13.9 19:02 ( 85, -9)
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Now it is very bright as 12.3 mag (Jan. 20, Toshihiko Ikemura, Hirohisa Sato). It will be observable at 13-14 mag for a long time from 2017 to 2018. In the Southern Hemisphere, it will be hardly observable after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 16 36.70 30 27.4 3.777 3.732 79 14.2 5:31 (270, 62)
Feb. 10 16 35.40 32 34.5 3.681 3.730 85 14.1 5:26 (268, 67)
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Now it is 13.7 mag (Jan. 22, Chris Wyatt). It stays 14 mag for a while. It stays observable in the evening sky until spring.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 2 26.30 -20 59.6 2.051 2.037 75 14.4 18:56 ( 23, 31)
Feb. 10 2 35.64 -16 26.4 2.125 2.055 72 14.5 19:02 ( 31, 33)
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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 14.6 mag still now (Jan. 19, Sandor Szabo). 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)
Feb. 3 2 38.29 11 41.1 7.426 7.440 87 15.2 18:56 ( 39, 62)
Feb. 10 2 40.06 11 51.9 7.559 7.458 80 15.4 19:02 ( 52, 57)
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Now it is 15.9 mag (Jan. 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)
Feb. 3 23 41.80 47 5.1 2.860 2.735 72 15.7 18:56 (125, 43)
Feb. 10 23 55.04 45 17.8 2.858 2.649 67 15.5 19:02 (123, 39)
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It brightened up to 9.7 mag in November (Nov. 16, Juan Jose Gonzalez). Now it is fading rapidly. It has already faded down to 13.3 mag (Jan. 20, Chris Wyatt).
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 15 58.47 -9 52.3 1.501 1.561 74 15.6 5:31 (329, 40)
Feb. 10 16 10.95 -10 32.2 1.492 1.614 78 16.2 5:26 (332, 40)
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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 15.5 mag (Jan. 20, Kunihiro Shima). It will be unobservable in March.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 0 59.97 -8 49.9 2.648 2.277 57 15.7 18:56 ( 51, 31)
Feb. 10 1 10.32 -6 41.8 2.697 2.259 53 15.8 19:02 ( 57, 29)
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Now it is 16.2 mag (Jan. 12, Toshihiko Ikemura, Hirohisa Sato). It will be unobservable temporarily soon.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 0 13.53 -2 57.5 4.878 4.285 48 15.8 18:56 ( 65, 27)
Feb. 10 0 15.43 -3 20.1 4.980 4.291 41 15.8 19:02 ( 70, 21)
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Now it is 17.4 mag (Dec. 18, Kim Breedlove). It will be observable at 14 mag in good condition from spring to summer.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 17 19.11 -30 17.5 2.246 1.832 53 16.0 5:31 (322, 13)
Feb. 10 17 40.65 -30 34.9 2.167 1.802 55 15.8 5:26 (322, 12)
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Now it is 16.4 mag (Jan. 12, 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)
Feb. 3 10 30.33 5 16.2 8.681 9.591 156 15.8 1:40 ( 0, 60)
Feb. 10 10 28.92 5 34.5 8.643 9.594 163 15.8 1:11 ( 0, 60)
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Now it is 16.1 mag (Jan. 15, 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)
Feb. 3 11 59.93 9 20.6 2.752 3.537 136 16.1 3:09 ( 0, 64)
Feb. 10 11 58.15 9 45.9 2.688 3.537 144 16.0 2:40 ( 0, 65)
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Now it is 15.8 mag (Dec. 25, Kunihiro Shima). 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)
Feb. 3 19 22.64 38 32.4 4.986 4.577 60 16.1 5:31 (242, 32)
Feb. 10 19 26.53 38 32.5 4.933 4.534 60 16.0 5:26 (244, 35)
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Now it is 15.3 mag (Jan. 19, Sandor Szabo). 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)
Feb. 3 8 4.36 39 45.0 4.455 5.354 153 16.0 23:09 (180, 85)
Feb. 10 7 55.00 40 43.1 4.512 5.360 146 16.1 22:33 (180, 84)
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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)
Feb. 3 14 10.06 -53 59.8 4.996 4.997 84 16.2 5:19 ( 0, 1)
Feb. 10 14 11.47 -55 32.3 4.877 4.961 89 16.1 4:53 ( 0, -1)
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Now it is 16.9 mag (Jan. 14, Toshihiko Ikemura, Hirohisa Sato). It stays 17 mag in 2018.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 3 15.08 0 11.9 6.419 6.535 92 16.2 18:56 ( 15, 54)
Feb. 10 3 16.84 0 33.1 6.558 6.566 86 16.3 19:02 ( 28, 52)
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Now it is 15.8 mag (Jan. 14, 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)
Feb. 3 20 45.08 66 31.1 3.439 3.465 83 16.2 5:31 (207, 30)
Feb. 10 20 54.87 67 56.9 3.475 3.491 82 16.3 5:26 (206, 31)
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Now it is 17.4 mag (Jan. 12, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and will be fainter than 18 mag in April.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 9 46.19 -15 30.6 2.195 3.064 146 16.8 0:56 ( 0, 39)
Feb. 10 9 41.90 -15 50.3 2.209 3.100 149 16.8 0:24 ( 0, 39)
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Now it is 16.4 mag (Jan. 19, Kunihiro Shima). 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)
Feb. 3 5 45.41 76 23.7 8.288 8.751 115 16.8 20:53 (180, 49)
Feb. 10 5 41.46 76 6.8 8.330 8.741 111 16.8 20:21 (180, 49)
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It will brighten up to 16 mag in spring. In the Southern Hemisphere, it stays observable until August, but it will be unobservable after that. In the Northern Hemisphere, it stays unobservable until June, but it will be observable in good condition after that.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 17 26.78 -46 0.4 2.086 1.700 53 17.0 5:31 (330, -1)
Feb. 10 17 58.59 -47 1.2 2.000 1.646 54 16.9 5:26 (329, -3)
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Now it is 16.3 mag (Jan. 18, Toshihiko Ikemura, Hirohisa Sato). It will be fading gradually after this, and it will be fainter than 18 mag in autumn. 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)
Feb. 3 20 35.46 60 0.3 7.024 6.868 76 16.9 5:31 (214, 28)
Feb. 10 20 46.76 60 25.9 7.068 6.888 75 17.0 5:26 (215, 30)
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Now it is 17.3 mag (Jan. 20, 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)
Feb. 3 15 0.19 -7 56.1 2.160 2.358 88 17.0 5:31 (346, 46)
Feb. 10 15 7.03 -8 0.2 2.105 2.391 94 17.0 5:26 (352, 47)
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It brightened up to 14.8 mag from autumn to winter (Nov. 21, Hiroshi Abe). Now it is fading. It has already faded down to 16.2 mag (Jan. 18, Toshihiko Ikemura, Hirohisa Sato). 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)
Feb. 3 5 4.04 38 13.3 1.654 2.345 123 17.1 20:11 (180, 87)
Feb. 10 5 9.02 37 47.0 1.755 2.379 117 17.4 19:48 (180, 87)
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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 16.0 mag (Jan. 12, Toshihiko Ikemura, Hirohisa Sato).
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 7 19.30 19 32.7 1.629 2.555 154 17.3 22:25 ( 0, 75)
Feb. 10 7 15.01 20 16.8 1.730 2.610 146 17.5 21:53 ( 0, 75)
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Now it is 17.0 mag (Jan. 18, 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)
Feb. 3 5 47.36 17 11.8 7.243 7.945 132 17.3 20:53 ( 0, 72)
Feb. 10 5 43.10 17 0.8 7.339 7.943 124 17.3 20:21 ( 0, 72)
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Now it is 16.8 mag (Jan. 12, Toshihiko Ikemura, Hirohisa Sato). It will be fading after this, and will be fainter than 18 mag in March. 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)
Feb. 3 5 0.86 34 29.4 2.735 3.374 122 17.4 20:07 ( 0, 89)
Feb. 10 5 2.57 34 12.5 2.840 3.396 116 17.5 19:42 ( 0, 89)
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Now it is 18.4 mag (Jan. 15, 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)
Feb. 3 11 56.03 -14 5.1 2.496 3.196 127 17.5 3:05 ( 0, 41)
Feb. 10 11 51.78 -13 49.7 2.466 3.244 135 17.6 2:33 ( 0, 41)
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Now it is 17.4 mag (Jan. 17, Toshihiko Ikemura, Hirohisa Sato). 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)
Feb. 3 12 45.57 9 22.4 4.783 5.422 125 17.7 3:54 ( 0, 64)
Feb. 10 12 41.63 10 50.2 4.711 5.443 133 17.7 3:23 ( 0, 66)
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It is observable at 17.5 mag in good condition from February to April. However, now it is 19.2 mag (Jan. 15, Toshihiko Ikemura, Hirohisa Sato), fainter than predicted.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 12 3.10 -8 16.5 2.010 2.743 129 17.9 3:12 ( 0, 47)
Feb. 10 12 2.90 -8 11.8 1.939 2.740 136 17.8 2:44 ( 0, 47)
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Now it is 17.0 mag (Jan. 20, Toshihiko Ikemura, Hirohisa Sato). It was observed at 17 mag in 2017. It will be observable at 18 mag in 2018.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 15 2.60 -20 10.3 6.177 6.168 84 17.9 5:31 (349, 34)
Feb. 10 15 4.16 -19 42.7 6.073 6.182 91 17.8 5:26 (354, 35)
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Now it is 17.4 mag (Jan. 20, Toshihiko Ikemura, Hirohisa Sato). It will brighten up to 15.5 mag in January, 2019. It stays observable in excellent condition in the Northern Hemispehre. It is observable only until June, 2018, in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Feb. 3 12 52.94 12 35.4 3.901 4.538 124 18.0 4:02 ( 0, 67)
Feb. 10 12 47.84 14 21.0 3.764 4.496 132 17.9 3:29 ( 0, 69)
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