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It brightened very rapidly as predicted. Now it is very bright as 7.8 mag (Dec. 22, Piotr Guzik). It will approach to the earth down to 0.08 a.u. to the earth in mid February, and it is expected to be observable at 6 mag in good condition. It keeps very low in the evening sky for a while. It will be unobservable temporarily in January. Then it keeps observable in good condition after mid February.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 20 37.71 -20 53.4 0.864 0.554 34 8.0 21:02 ( 68, 5)
Dec. 31 20 56.91 -19 7.1 0.712 0.533 31 7.2 21:03 ( 68, 2)
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It brightened rapidly. Now it is very bright as 8.5 mag (Dec. 23, Piotr Guzik). It will approach to the sun down to 0.3 a.u. on Jan. 14. It may brighten up to 6 mag. In the Northern Hemisphere, it keeps observable in the morning sky until early January while the comet will be brightening. It is not observable at all in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 16 47.88 13 55.9 0.773 0.665 42 8.7 2:57 (272,-28)
Dec. 31 17 24.43 2 18.5 0.868 0.516 31 7.8 3:02 (283,-22)
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Now it is 11.7 mag (Dec. 22, Thomas Lehmann). It is expected to brighten up to 7 mag in 2017 summer. In the Northern Hemisphere, it keeps observable in good condition until the highlight while the comet will be brightening. In the Southern Hemisphere, it is not observable until early 2017.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 14 15.92 44 5.4 2.598 2.716 86 11.1 2:57 (227,-15)
Dec. 31 14 30.97 44 2.0 2.493 2.651 88 10.9 3:02 (225,-13)
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Now it is 14.0 mag (Dec. 18, Thomas Lehmann). It is expected to brighten up to 7 mag in 2017 spring. But it locates somewhat low at the high light.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 14 49.66 -18 49.0 2.882 2.322 46 12.5 2:57 (283, 14)
Dec. 31 15 4.67 -19 45.0 2.736 2.239 50 12.2 3:02 (282, 18)
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Now it is 15.5 mag (Dec. 6, Kunihiro Shima). It will brighten up to 12 mag from winter to spring. In the Northern Hemisphere, it keeps observable while the comet is brightening gradually. But it will be unobservable in late February. In the Southern Hemisphere, it keeps unobservable until December. But it keeps observable for a long time after late December.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 14 42.02 -7 29.2 1.861 1.482 52 13.9 2:57 (272, 10)
Dec. 31 15 5.68 -9 33.5 1.769 1.418 53 13.4 3:02 (273, 13)
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It was observed as bright as 12-13 mag from late October to early November. Now it is not observable. It will appear in the morning sky in March.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 20 3.45 -21 50.3 6.745 5.878 26 13.9 21:02 ( 62, -1)
Dec. 31 20 9.16 -21 28.6 6.788 5.876 20 13.9 21:03 ( 59, -5)
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It brightened very rapidly up to 12 mag in autumn, brighter than originally expected. It will not be observable after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 19 25.33 -13 55.8 2.965 2.069 20 14.0 21:02 ( 63,-13)
Dec. 31 19 41.94 -13 3.5 3.002 2.085 17 14.3 21:03 ( 61,-16)
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Now it is 15.2 mag (Nov. 17, Ken-ichi Kadota). It will brighten up to 14 mag from winter to spring in 2017, and it will be observable in excellent condition in the Northern Hemisphere. It keeps low in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 11 41.89 25 13.2 1.964 2.424 105 14.3 2:57 (217, 20)
Dec. 31 11 49.28 25 38.6 1.897 2.428 110 14.2 3:02 (211, 22)
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Already bright as 12.0 mag (Dec. 21, Thomas Lehmann). It will pass the perihelion on Mar. 10, 2017. In the Northern Hemisphere, it keeps observable in the evening sky until late February while the comet will be brightening up to 8.5 mag. In the Southern Hemisphere, it will appear in the morning sky in late March at 8 mag, then it keeps observable while the comet will be fading.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 22 56.78 3 59.2 1.422 1.503 74 15.0 21:02 (109, 18)
Dec. 31 23 1.17 4 5.7 1.422 1.407 68 14.3 21:03 (105, 13)
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It brightened up to 11-12 mag in autumn. Now it is fading. But it is bright as 13.3 mag still now (Dec. 2, Seiichi Yoshida). It is getting higher gradually after this also in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 13 8.56 -11 27.6 1.955 1.901 72 14.4 2:57 (262, 31)
Dec. 31 13 18.79 -12 35.2 1.924 1.948 76 14.7 3:02 (260, 36)
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Now it is 14.2 mag (Nov. 22, Chris Wyatt). Distant object, but it keeps observable at 13-14 mag for a long time from 2015 to 2016.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 0 39.80 -5 0.5 4.941 5.117 94 14.6 21:02 (121, 43)
Dec. 31 0 42.66 -4 45.5 5.064 5.132 88 14.6 21:03 (115, 38)
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It brightened up to 11-12 mag from summer to autumn. Now it is fading. But it is bright as 13.3 mag still now (Dec. 2, Seiichi Yoshida).
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 12 10.80 -19 56.1 1.784 1.916 82 14.6 2:57 (262, 47)
Dec. 31 12 17.77 -21 29.9 1.755 1.963 86 14.8 3:02 (259, 53)
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It brightened up to 11 mag from spring to summer. Now it is not observable. It will be observable at 16 mag again in 2017 spring.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 17 16.00 -21 3.3 3.118 2.170 12 14.9 2:57 (306,-12)
Dec. 31 17 31.64 -21 18.2 3.138 2.211 16 15.0 3:02 (303, -8)
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Now it is bright as 15.3 mag (Nov. 22, Thomas Lehmann). It will be observable at 11 mag for a long time from 2017 to 2018. Now it is observable in excellent condition in the Southern Hemisphere. But it keeps low for a while in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 2 54.08 -37 59.2 5.200 5.509 103 15.0 21:02 ( 55, 85)
Dec. 31 2 51.10 -36 54.8 5.213 5.456 99 15.0 21:03 ( 77, 79)
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Now it is 15.4 mag (Dec. 2, Kunihiro Shima). It keeps 15 mag until spring. But it will be getting lower gradually after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 22 58.16 1 37.1 1.840 1.834 74 15.4 21:02 (107, 20)
Dec. 31 23 10.86 3 15.8 1.879 1.809 70 15.3 21:03 (106, 16)
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Now it is 15.0 mag (Dec. 6, Kunihiro Shima). It will brighten up to 12-13 mag and will be observable in good condition in 2017 summer. In this winter, it is observable until mid January in the Southern Hemisphere, or until the end of February in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 0 25.20 18 25.1 3.392 3.700 100 15.5 21:02 (136, 23)
Dec. 31 0 19.64 17 20.1 3.486 3.654 91 15.5 21:03 (128, 19)
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It brightened up to 6 mag from last autumn to last winter. Now it is fading. It has already faded down to 15.2 mag (Nov. 2, Yuji Ohshima). It is observable in good condition in the Northern Hemisphere. It is not observable after this in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 3 21.33 53 9.0 4.559 5.316 136 15.5 21:08 (180, 2)
Dec. 31 3 13.19 52 4.3 4.686 5.383 131 15.7 21:03 (175, 3)
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Appearing in the morning sky in the Northern Hemisphere. Now it is fading. But it must be bright as 15 mag still now.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 15 26.32 -19 44.4 2.848 2.162 38 15.6 2:57 (289, 8)
Dec. 31 15 39.95 -20 10.3 2.861 2.231 42 15.8 3:02 (287, 12)
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Now it is 15.8 mag (Dec. 3, Kunihiro Shima). It will brighten up to 14 mag from summer to winter in 2017. Then it will be observable in excellent condition in the Northern Hemisphere. In the Southern Hemisphere, it is hardly observable around the highlight.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 22 49.53 -6 29.3 4.312 4.064 68 15.8 21:02 ( 99, 23)
Dec. 31 22 51.25 -5 19.6 4.381 4.025 62 15.8 21:03 ( 96, 17)
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Now it is 16.8 mag (Dec. 1, Kunihiro Shima). It will be observable at 16-17 mag in good 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. 24 7 18.20 26 15.3 2.829 3.785 164 15.8 1:08 (180, 29)
Dec. 31 7 13.25 26 34.1 2.801 3.777 171 15.8 0:36 (180, 28)
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It will brighten up to 14 mag from spring to summer in 2017. 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)
Dec. 24 15 3.22 -13 34.0 3.861 3.245 45 15.9 2:57 (281, 9)
Dec. 31 15 12.28 -14 16.6 3.774 3.231 50 15.8 3:02 (278, 14)
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Now it is 15.7 mag (Dec. 15, Kunihiro Shima). It keeps 16-17 mag for a long time from 2016 to 2019. It keeps locating near by the equator.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 9 22.17 1 39.3 9.020 9.666 128 16.0 2:57 (186, 53)
Dec. 31 9 21.35 1 45.2 8.931 9.660 135 16.0 2:43 (180, 53)
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Now it is 15.8 mag (Nov. 23, Katsumi Yoshimoto). It will be observable at 15-16 mag in good condition from autumn to winter. It locates somewhat low in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 4 6.72 33 13.5 1.880 2.782 151 16.1 21:53 (180, 22)
Dec. 31 4 4.33 32 47.2 1.948 2.805 144 16.2 21:23 (180, 22)
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Now it is 16.6 mag (Dec. 1, Kunihiro Shima). It will brighten up to 15 mag and will be observable in good condition from autum to winter in 2017. In the Northern Hemisphere, it keeps observable in good condition for a long time while the comet will be brightening. It is not observable until 2017 summer in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 2 17.97 51 9.7 4.517 5.179 127 16.4 21:02 (171, 3)
Dec. 31 2 10.21 49 26.0 4.564 5.148 121 16.4 21:03 (165, 3)
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It has been lost since its discovery in 1978. In 2016, it is expected to return in excellent condition from autumn to winter.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 0 16.66 -0 34.1 0.953 1.384 91 16.4 21:02 (120, 36)
Dec. 31 0 39.05 2 34.0 1.011 1.416 90 16.8 21:03 (122, 33)
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Now it is 16.7 mag (Nov. 3, iTelescope Observatory, Siding Spring). It keeps 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. 24 9 37.66 -10 52.8 5.336 5.874 118 16.8 2:57 (198, 65)
Dec. 31 9 33.36 -10 19.9 5.217 5.852 126 16.8 2:55 (180, 65)
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It brightened up to 15 mag in early 2016. Now it is fading. It has already faded down to 16.3 mag (Dec. 6, Kunihiro Shima). In the Northern Hemisphere, it keeps observable in good condition for a long time until 2017 autumn when the comet will be fainter than 18 mag. It will never be observable after this in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 15 2.32 66 7.6 5.960 6.147 96 16.8 2:57 (208,-31)
Dec. 31 15 10.33 66 23.4 5.963 6.174 97 16.8 3:02 (207,-29)
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It will brighten up to 10 mag in 2017 summer, and it will be 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. 24 13 46.47 -3 11.2 2.499 2.296 66 17.0 2:57 (261, 18)
Dec. 31 13 58.32 -4 15.1 2.383 2.257 70 16.8 3:02 (258, 23)
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Now it is 16.9 mag (Nov. 25, Ken-ichi Kadota). It brightened rapidly, and became brighter than originally expected. It keeps 17 mag until 2017. In the Northern Hemisphere, it keeps 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)
Dec. 24 13 46.65 55 38.8 7.148 7.328 96 16.9 2:57 (214,-18)
Dec. 31 13 46.13 56 9.5 7.090 7.334 100 16.9 3:02 (210,-15)
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It brightened rapidly up to 16.3 mag in autumn (Sept. 7, Alexander Baransky). Now it is 17.2 mag (Dec. 8, Kunihiro Shima). It is observable until mid January in the Southern Hemisphere, or until March in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 23 14.08 -2 46.7 2.649 2.593 75 16.9 21:02 (106, 26)
Dec. 31 23 22.55 -1 35.2 2.728 2.586 71 16.9 21:03 (104, 21)
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It brightened up to 8-9 mag from last winter to spring. Now it is fading. It has already faded down to 16.4 mag (Dec. 2, Ken-ichi Kadota).
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 13 14.29 -10 27.2 4.786 4.567 71 16.9 2:57 (262, 29)
Dec. 31 13 15.26 -11 15.1 4.730 4.625 77 17.0 3:02 (258, 36)
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Now it is 18.8 mag (Dec. 8, Mt. Lemmon Survey). It will approach to the earth down to 0.14 a.u. from March to April. It is expected to brighten up to 5-6 mag. It may brighten furthermore in outburst. In the Northern Hemisphere, it keeps observable in excellent condition. In the Southern Hemisphere, it will not be observable for about one month around the highlight. But it keeps observable in good condition except for that period.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 9 12.79 7 33.9 0.894 1.726 133 17.5 2:57 (182, 47)
Dec. 31 9 18.00 7 23.9 0.791 1.665 139 17.0 2:40 (180, 48)
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Now it is 17.3 mag (Nov. 7, Mt. Lemmon Survey). It will be observable at 17 mag in good condition in winter.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 12 26.82 -0 58.6 2.318 2.452 85 17.0 2:57 (245, 33)
Dec. 31 12 33.50 -1 17.1 2.255 2.480 91 17.1 3:02 (240, 38)
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Now it is 17.4 mag (Nov. 25, Ken-ichi Kadota). In the Northern Hemisphere, it will be observable at 17 mag in excellent condition in winter. It locates low in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 7 8.42 34 47.3 2.455 3.407 162 17.1 0:59 (180, 20)
Dec. 31 7 3.79 34 56.1 2.447 3.413 167 17.1 0:27 (180, 20)
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Now it is 17.8 mag (Dec. 3, Kunihiro Shima). It was observed at 17 mag last winter. It will be observable at 17 mag again next winter. It is observable in good condition in the Northern Hemisphere. But it locates low in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 11 22.01 20 53.3 3.482 3.910 108 17.1 2:57 (215, 26)
Dec. 31 11 24.58 22 23.4 3.408 3.931 115 17.1 3:02 (207, 28)
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It will pass the perihelion in 2019. However, it has not been brightening since the discovery in 2010. Now it is 17.3 mag (Nov. 4, D. Buczynski). It keeps observable in excellent condition in the Northern Hemisphere. It is not observable in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 3 57.05 62 3.1 8.916 9.640 135 17.2 21:44 (180, -7)
Dec. 31 3 52.93 61 57.1 8.937 9.621 131 17.2 21:12 (180, -7)
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It will be observable at 17.5 mag in good condition from winter to spring.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 13 47.00 -5 28.0 2.485 2.265 65 17.4 2:57 (263, 20)
Dec. 31 13 58.30 -6 26.8 2.418 2.274 69 17.4 3:02 (260, 25)
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Now it is 17.3 mag (Nov. 9, L. Elenin). It keeps 17 mag for a long time from 2016 autumn to 2017 summer, and it keeps observable good condition all through that period in the Southern Hemisphere. In the Northern Hemisphere, it will never be observable again after this.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 2 16.78 -64 53.0 2.490 2.531 81 17.5 21:02 ( 12, 59)
Dec. 31 2 1.74 -64 48.0 2.539 2.512 77 17.5 21:03 ( 20, 56)
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Now it is 17.5 mag (Oct. 24, D. Buczynski). It will brighten up to 16 mag in 2017 summer, but it is not observable around the high light. It is observable at 17-18 mag until March in the Southern Hemisphere, or until April in the Northern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 2 0.42 1 46.7 2.131 2.708 115 17.8 21:02 (151, 49)
Dec. 31 2 0.92 2 18.7 2.183 2.672 109 17.7 21:03 (142, 45)
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Now it is 17.0 mag (Nov. 10, Purple Mountain Observatory, XuYi Station). It keeps observable at 17.5 mag in good condition from autumn to winter.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 3 5.32 14 39.9 2.276 3.057 135 17.7 21:02 (177, 40)
Dec. 31 3 4.85 14 34.8 2.347 3.056 128 17.8 21:03 (168, 39)
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It had been lost for a long time over 200 years since its discovery in 1783. It brightened rapidly, and reached up to 13.9 mag in September (Spet. 1, Sandor Szabo). Now it is fading. It has already faded down to 16.2 mag (Dec. 1, Kunihiro Shima). It is observable in excellent condition for a while in the Northern Hemisphere. It is not observable after this in the Southern Hemisphere.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 3 21.08 58 12.1 1.231 2.042 134 17.7 21:07 (180, -3)
Dec. 31 3 8.90 58 40.6 1.312 2.072 128 18.2 21:03 (175, -4)
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Now it is 17.0 mag (Nov. 2, Mitsunori Tsumura). It tends to be brightest after the perihelion passage. It is observable at 17.5 mag in good condition from autumn to winter.
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Best Time(A, h)
Dec. 24 2 5.87 0 32.8 2.608 3.173 116 17.9 21:02 (152, 51)
Dec. 31 2 7.39 1 5.8 2.709 3.185 110 18.0 21:03 (143, 47)
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