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Already visible easily with a naked eye at 4.5 mag. It will reach to 4 mag locating high in the evening sky from mid December to the end of January. In the Northern Hemisphere, it keeps observable in good condition for a long time while the comet is bright enough visible visually until 2005 October when it becomes faint as 14 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 4 23.81 -14 13.1 0.439 1.341 137 4.5 78.4 336.3 22:32 (180, 69)
Dec. 25 4 8.00 -4 13.0 0.386 1.298 138 4.1 105.7 340.7 21:49 (180, 58)
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New comet. It must have located in the very low sky at dawn in October and November. Now it is passing through the field of SOHO/LASCO. If it survives the perihelion passage, it will appear in the evening sky in late December, then it will be observable while fading.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 17 29.38 -19 7.8 1.176 0.218 5 5.9 197.1 83.3 2:54 (311,-19)
Dec. 25 19 9.84 -19 3.7 1.007 0.234 13 5.6 190.3 98.2 21:02 ( 56,-12)
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In the Southern Hemisphere, it keeps observable in good condition until April when it reaches to 13 mag. In the Northern Hemisphere, it will appear at dusk in mid January at 9 mag, then it will keep observable until the end of March in the evening sky.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 9 28.42 -57 38.3 1.167 1.480 86 7.3 96.8 243.8 2:54 (343, 66)
Dec. 25 8 0.45 -60 33.8 1.153 1.559 93 7.5 100.9 264.9 1:50 ( 0, 64)
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It will be fading gradually after this, but it keeps 11 mag until the end of January. It will be visible visually until May when it becomes too low in the evening sky.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 3 5.48 11 7.4 1.197 2.053 140 10.7 2.3 112.7 21:16 (180, 44)
Dec. 25 3 7.22 11 6.1 1.260 2.066 133 10.9 5.2 84.4 21:02 (176, 44)
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It will be fading gradually after this, but it keeps 11 mag until mid January. In the Northern Hemisphere, it keeps observable until July when it becomes fainter than 18 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 23 28.41 42 34.6 1.594 2.051 102 10.9 10.4 340.7 20:58 (146, 0)
Dec. 25 23 27.44 43 45.1 1.678 2.058 97 11.0 10.3 1.7 21:02 (142, -5)
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Very diffused and widely spreading visually. It keeps bright at 11 mag untill January.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 11 24.03 12 32.8 0.973 1.493 99 11.2 37.2 93.3 2:54 (227, 29)
Dec. 25 11 41.18 12 21.9 0.939 1.500 102 11.2 34.6 91.4 2:57 (224, 31)
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In the Northern Hemisphere, it keeps observable until 2005 spring when it reaches to 8 mag. It will be unobservable in the evening sky soon. The altitude in the morning will be constant until late February, and it will not be higher.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 17 31.22 44 46.0 2.114 1.973 68 11.7 40.8 127.5 2:54 (240,-53)
Dec. 25 17 51.82 41 49.8 2.064 1.881 65 11.5 40.8 128.2 2:57 (244,-51)
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The condition of this return is bad. It is not observable around the perihelion passage. It will appear at dawn in 2005 July at 14.5 mag, then it will be fading after that.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 18 4.22 -20 24.6 2.530 1.553 5 13.1 45.5 95.3 20:58 ( 48,-17)
Dec. 25 18 27.09 -20 47.8 2.506 1.526 3 12.7 46.5 93.2 21:02 ( 46,-18)
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It is a bit brighter visually than this ephemeris, around 12.5 mag. It keeps observable at 12-13 mag in the evening sky until May.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 2 25.42 13 44.0 1.286 2.079 132 13.0 8.6 335.1 20:58 (173, 41)
Dec. 25 2 24.59 14 42.0 1.319 2.049 125 12.9 8.7 1.1 21:02 (163, 39)
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Completely diffused visually. It keeps observable for a long time after this in the Northern Hemisphere. It is also visible at midnight or dawn, but low.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 20 46.34 63 32.6 3.050 3.269 93 13.1 27.1 115.1 20:58 (149,-31)
Dec. 25 21 10.70 62 11.9 3.158 3.348 92 13.3 25.8 115.7 21:02 (147,-31)
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Although it was faint at 13 mag in early December, it brightened to 11 mag again in mid December.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 23 58.11 9 2.8 5.529 5.729 96 13.4 3.4 85.2 20:58 (129, 30)
Dec. 25 23 59.97 9 6.5 5.641 5.729 90 13.4 4.5 80.1 21:02 (123, 25)
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It bursted out in late November and reached to 13.5 mag. Now it is visible visually.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 7 15.24 49 7.4 1.771 2.661 148 13.7 57.7 305.7 1:30 (180, 6)
Dec. 25 6 38.28 52 35.5 1.765 2.665 150 13.7 58.0 296.7 0:26 (180, 3)
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It will be getting fainter gradually until 2005 June when it becomes 17 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 11 30.08 -17 4.5 3.651 3.721 86 14.0 8.3 256.2 2:54 (256, 48)
Dec. 25 11 25.65 -17 15.5 3.604 3.801 94 14.1 10.2 263.6 2:57 (248, 55)
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It will be fading slowly until 2005 August when it becomes low in the evening sky at 16.5 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 0 16.08 44 43.8 1.394 1.981 111 14.2 7.2 335.3 20:58 (154, 3)
Dec. 25 0 15.50 45 31.5 1.450 1.970 106 14.3 7.2 9.4 21:02 (150, -1)
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It tends to become brightest after the perihelion passage. It was 16 mag in mid December, fainter than expected by about 1-1.5 mag. If it brightens as expected, it will reach to 14 mag in February at the opposition.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 10 34.56 22 15.7 2.178 2.728 113 14.6 10.1 52.3 2:54 (210, 27)
Dec. 25 10 38.03 23 3.2 2.109 2.738 120 14.5 9.3 37.7 2:57 (203, 29)
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Diffused, and fading rapidly. It was around 16 mag in mid December, fainter than this ephemeris by 1 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 11 41.40 39 57.6 2.918 3.315 105 14.9 4.3 325.8 2:54 (213, 4)
Dec. 25 11 39.22 40 24.7 2.898 3.385 111 15.0 6.3 311.6 2:57 (207, 7)
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It has been brightening more rapidly than expected, and already reached to 15.5 mag. It may be reach to 13 mag in 2006.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 5 44.50 47 58.0 5.384 6.292 155 15.1 6.5 290.9 23:54 (180, 7)
Dec. 25 5 40.24 48 12.0 5.363 6.264 154 15.1 6.3 285.6 23:22 (180, 7)
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It keeps 15-16 mag in the evening sky until May.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 0 55.39 -21 56.5 1.120 1.571 96 15.3 24.8 36.5 20:58 (111, 62)
Dec. 25 1 3.67 -19 30.0 1.131 1.535 92 15.3 28.6 40.1 21:02 (109, 56)
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Almost stellar. It keeps observable in good condition until April when it becomes fainter than 18 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 23 47.76 26 56.4 0.691 1.307 101 15.3 51.0 34.2 20:58 (140, 15)
Dec. 25 0 3.57 31 30.0 0.756 1.337 99 15.5 47.2 39.7 21:02 (140, 9)
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It keeps observable at 15.5 mag until mid February.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 2 30.42 29 52.0 0.616 1.492 136 15.3 74.2 238.2 20:58 (175, 25)
Dec. 25 1 59.44 25 2.4 0.614 1.410 122 15.5 68.9 232.2 21:02 (159, 27)
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It will be observable in good conditon at 15.5 mag until late January. In its last return in 1997, it burst out after the perihelion passage and became extremely bright, reached to 11 mag. However, it is faint in this return.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 9 6.35 18 35.1 1.140 1.947 132 15.5 16.7 25.4 2:54 (187, 36)
Dec. 25 9 9.08 20 28.5 1.096 1.953 139 15.4 17.7 12.5 2:54 (180, 35)
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It will reach to 9 mag in 2006 spring. It has been brightening well as expected. In this season, it keeps observable until March when it becomes 15.5 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 5 4.92 -17 32.2 4.252 5.027 137 15.7 16.8 252.9 23:14 (180, 73)
Dec. 25 4 57.05 -18 2.5 4.226 4.964 134 15.6 16.4 256.9 22:39 (180, 73)
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It was visible visually around 13.5 mag in October, but became faint rapidly in November. It keeps observable until it becomes fainter than 18 mag in March.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 1 7.12 6 28.8 1.130 1.750 111 15.8 25.8 46.1 20:58 (145, 42)
Dec. 25 1 16.42 8 32.8 1.201 1.765 107 16.1 27.2 50.0 21:02 (141, 38)
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Brighening well as expected. We can observe it in good condition while it is brightening, then the comet will reach to 9 mag in next spring and summer. It may become a naked-eye object due to the Deep Impact mission on July 4.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 12 16.14 10 33.7 2.194 2.357 86 16.5 21.3 102.6 2:54 (239, 22)
Dec. 25 12 25.85 10 3.2 2.070 2.315 91 16.2 20.6 101.3 2:57 (235, 26)
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New comet. It will be observable in good condition at 16 mag from January to March.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 7 54.58 58 36.3 1.318 2.151 137 16.4 9.3 15.6 2:08 (180, -4)
Dec. 25 7 55.88 59 32.7 1.268 2.116 139 16.3 7.1 3.2 1:42 (180, -4)
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It will be getting fainter and lower until March, when it becomes 17.5 mag and too low.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 23 47.63 4 23.0 2.303 2.544 92 16.4 16.6 64.5 20:58 (124, 32)
Dec. 25 23 55.01 5 15.1 2.386 2.540 87 16.5 18.3 64.9 21:02 (119, 27)
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It is observable at 16.5 mag in good condition until February.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 5 48.27 27 54.8 1.952 2.933 175 16.5 11.5 262.6 0:02 (180, 27)
Dec. 25 5 42.25 27 42.8 1.947 2.924 171 16.5 11.4 260.4 23:24 (180, 27)
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It will be as faint as 17.5 mag in March when it becomes low in the evening western sky.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 0 52.97 -2 52.0 3.475 3.842 104 16.5 5.1 29.3 20:58 (134, 48)
Dec. 25 0 54.50 -2 19.2 3.597 3.861 98 16.6 6.4 39.6 21:02 (126, 43)
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New comet. It must have been observable at 15-16 mag in the evening sky since November. It will fade out rapidly after this, and will be fainter than 18 mag in early January.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 23 23.45 6 43.5 0.470 1.075 87 16.7 128.8 63.2 20:58 (122, 27)
Dec. 25 0 14.96 12 50.0 0.514 1.149 95 17.2 111.6 65.3 21:02 (130, 25)
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It will be too low in the evening sky at 17.5 mag in early February.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 22 22.72 4 6.5 5.906 5.699 73 16.8 1.7 168.0 20:58 (108, 17)
Dec. 25 22 23.11 3 57.3 6.075 5.750 66 16.9 1.7 128.0 21:02 (103, 11)
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Diffused, and fading rapidly. It will be fainter than 18 mag in January.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 1 36.91 8 45.2 2.067 2.689 119 16.9 4.2 45.6 20:58 (156, 43)
Dec. 25 1 38.86 9 8.2 2.197 2.732 112 17.3 6.4 55.3 21:02 (147, 40)
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New comet. Although the condition is good, it will be fainter than 18 mag in late February.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 3 53.80 7 27.5 1.046 1.957 149 17.0 12.9 324.7 22:03 (180, 47)
Dec. 25 3 51.03 8 45.3 1.071 1.946 142 17.0 12.4 340.1 21:33 (180, 46)
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It is observable at 17 mag in good condition until January.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 0 54.62 9 14.7 2.683 3.155 109 17.1 5.6 88.1 20:58 (143, 38)
Dec. 25 0 57.72 9 19.0 2.769 3.146 103 17.2 7.6 82.0 21:02 (136, 34)
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New comet. Although the condition is good, it will be fainter than 18 mag in February.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 5 23.01 31 56.7 0.956 1.933 170 17.3 6.0 291.3 23:32 (180, 23)
Dec. 25 5 20.16 32 8.6 0.959 1.925 165 17.3 4.7 284.7 23:02 (180, 23)
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It keeps 17.5 mag and locating high until February.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 3 29.76 15 2.4 2.204 3.078 147 17.3 10.8 291.7 21:39 (180, 40)
Dec. 25 3 25.38 15 32.0 2.233 3.047 139 17.3 9.2 299.2 21:08 (180, 39)
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New comet. It is observable in good condition at 17.5 mag until March.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 9 46.20 37 18.3 3.768 4.429 126 17.6 4.9 3.0 2:54 (193, 16)
Dec. 25 9 45.90 37 53.4 3.695 4.425 133 17.6 5.2 346.2 2:57 (187, 17)
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Although it has passed the perihelion about 1 year ago, it has been brightening gradually, and reached to 17.5 mag now.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 7 39.06 44 54.9 3.107 3.977 148 17.7 9.3 313.9 1:52 (180, 10)
Dec. 25 7 34.27 45 37.1 3.093 3.992 152 17.7 9.5 306.2 1:20 (180, 9)
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It keeps observable at 18 mag in good condition until January.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 6 30.37 9 16.7 3.361 4.307 162 17.7 19.2 241.6 0:44 (180, 46)
Dec. 25 6 22.40 8 14.8 3.398 4.354 164 17.8 18.8 243.1 0:09 (180, 47)
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It will reach to 16.7 mag at best in early 2006. Because it moves in the northern sky, it keeps observable for a long time in the Northern Hemisphere.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 5 19.92 47 4.7 4.998 5.909 155 17.8 8.4 294.7 23:29 (180, 8)
Dec. 25 5 14.72 47 26.8 4.988 5.881 153 17.8 8.0 290.7 22:56 (180, 8)
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It keeps 18 mag until 2005 spring.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 18 14 15.13 42 37.1 6.648 6.578 81 17.8 5.1 7.7 2:54 (231,-19)
Dec. 25 14 15.30 43 15.1 6.590 6.602 86 17.8 5.8 358.5 2:57 (227,-14)
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