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Image:
1999 Sept. 5
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It brightened rapidly and reached to 9.5 mag. It will close to the earth down to 0.5 AU in October and reach to 8 mag. Because the comet goes southwards, northern people can observe it only until mid October. On the other hand, southern people can observe it after when it appears in October.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 8 24.89 40 1.8 1.008 0.979 58 8.7 54.0 194.6 4:32 (222, -4)
Sept.25 8 16.15 32 45.3 0.850 0.982 63 8.3 76.2 192.8 4:21 (224, 4)
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Image:
1999 Sept. 5
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The CCD images show the long anti-tail. Southern observers cannot see it until October. It passes by double cluster NGC 869 and 884 on Sept. 25.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 4 4.32 59 1.8 0.905 1.467 100 8.4 98.9 279.4 4:21 (180, -4)
Sept.25 2 25.68 58 16.1 0.842 1.568 116 8.7 119.0 256.9 2:17 (180, -3)
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Image:
1999 Sept. 5
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10 mag visually, well condensed and easy to see. It looks cometary also by CCD now and becomes harder to catch. It passes close by a globular cluster M54 on Sept. 24.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 18 36.42 -30 29.0 0.888 1.485 103 10.0 37.9 102.2 19:16 (126, 83)
Sept.25 18 57.10 -31 14.2 0.933 1.491 100 10.2 39.2 97.5 19:22 (112, 81)
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Image:
1999 Aug. 31
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It is fading out rapidly since late August. It keeps observable for Northern people. It locates low at dusk until late October, then it turns to appear at dawn. It passes near by the North Pole in early February in 2000.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 13 13.75 33 38.3 1.930 1.301 38 10.9 18.3 43.5 19:16 (120,-17)
Sept.25 13 20.86 35 10.2 2.011 1.397 39 11.5 18.1 43.8 19:22 (118,-22)
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Only southern people can observe it. Northern people can never see it again.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 7 6.71 -69 49.6 9.406 9.367 84 12.6 7.1 164.7 4:32 (340, 48)
Sept.25 7 8.86 -70 38.3 9.467 9.419 84 12.6 7.1 170.1 4:21 (342, 49)
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Image:
1998 Dec. 5
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Only southern people can observe it. It will appear again in 2000 August as 13 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 10 30.92 -61 38.6 3.799 3.498 65 12.7 24.2 135.4 4:32 (327, 29)
Sept.25 10 48.63 -63 40.2 3.796 3.486 64 12.7 25.0 134.9 4:21 (329, 30)
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Image:
1999 July 30
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Not observable. It appears again at dawn as 15 mag in December.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 13 48.51 -18 41.2 2.571 1.880 37 13.2 3.5 61.5 19:16 ( 80, 19)
Sept.25 13 50.22 -18 32.3 2.724 1.939 31 13.5 3.9 76.9 19:22 ( 76, 13)
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Not yet observed in this return. The ephemeris says it reaches to 12 mag from October to December. However, it will be much fainter than the ephemeris in fact.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 0 59.26 -32 27.5 0.889 1.804 144 13.6 9.7 266.0 1:14 (180, 87)
Sept.25 0 53.14 -32 19.9 0.850 1.769 145 13.4 12.7 283.4 0:41 (180, 87)
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Image:
1999 June 12
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After conjunction, it appears at dawn in 2000 January.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 15 6.45 -26 9.2 6.620 6.134 57 14.0 8.6 98.3 19:16 ( 83, 39)
Sept.25 15 11.02 -26 18.5 6.707 6.132 51 14.0 9.2 99.0 19:22 ( 79, 33)
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Image:
1999 Sept. 5
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Because it is far away, it keeps 15 mag until late 2000, while Northern people can observe it under good condition.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 21 16.93 32 33.6 3.852 4.581 131 14.0 11.4 191.7 21:28 (180, 23)
Sept.25 21 15.97 31 12.5 3.853 4.558 129 14.0 12.0 185.5 21:00 (180, 24)
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Not observable around the perihelion passage at all. When it appears at dawn in 2000 June, it will be already fainter than 15 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 12 18.81 4 33.9 2.807 1.825 9 14.3 37.7 116.5 19:16 ( 87,-12)
Sept.25 12 34.81 2 34.6 2.777 1.790 7 14.0 38.7 116.4 19:22 ( 83,-14)
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Image:
1998 Dec. 13
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Appearing at dawn. No observations reported since Jan. 12.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 8 41.97 10 55.7 2.693 2.108 45 14.0 28.8 108.0 4:32 (247, 13)
Sept.25 8 54.61 9 52.9 2.673 2.147 48 14.2 27.5 109.2 4:21 (247, 14)
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Image:
1999 May 20
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Not observable. After conjunction, it will appear again at dawn in mid October as 14.5 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 10 33.07 1 48.3 4.284 3.335 16 14.4 16.1 143.1 4:32 (271, -4)
Sept.25 10 37.42 0 18.9 4.308 3.399 22 14.5 15.6 144.7 4:21 (270, -1)
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Image:
1999 Sept. 5
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Although it will be low in October and November, Northern people can observe it as 14 mag until 2000 April. Then they can trace it until July as the comet gets low at dusk as 16.5 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 14 18.01 37 34.5 4.063 3.512 50 14.8 11.9 180.5 19:16 (130, -8)
Sept.25 14 18.25 36 15.0 4.109 3.518 48 14.8 10.9 175.3 19:22 (125,-13)
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First return of a split comet. The condition is best and we can always observe it until it faded out. It wad recovered as about 20.5 mag (m2) on Aug. 3, about 3 mag fainter than this ephemeris. It will be around 19 mag now in fact.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 16 54.35 -11 3.4 1.277 1.468 79 15.4 15.0 96.0 19:16 (121, 52)
Sept.25 17 2.31 -11 14.8 1.269 1.390 74 14.9 18.7 95.2 19:22 (114, 48)
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 0 20.29 9 15.3 1.017 2.004 164 15.1 16.5 262.5 0:36 (180, 46)
Sept.25 0 12.66 8 56.7 1.051 2.049 171 15.3 16.1 259.0 0:01 (180, 46)
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Image:
1999 July 31
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Almost stellar object. The perihelion passage is in 2000 July, when it will be 13.5 mag. But the comet is in the southern sky. Northern people can observe it until October as 15 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 18 12.58 -27 48.0 3.972 4.233 98 15.3 8.4 200.1 19:16 (119, 77)
Sept.25 18 11.51 -28 42.2 4.054 4.193 91 15.3 7.6 188.4 19:22 (103, 71)
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Image:
1999 Sept. 5
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Because it is extremely far away, it keeps 15 mag until late 2000, while Northern people can observe it under good condition. Looks like a stellar object by CCD.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 15 36.01 45 45.7 7.556 7.227 67 15.5 11.0 164.3 19:16 (146, -3)
Sept.25 15 38.20 44 33.1 7.583 7.219 65 15.5 10.8 160.3 19:22 (142, -6)
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Not yet observed in this return. We can observe it until November as 15-16 mag. But it should be much fainter than the ephemeris.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 6 15.17 50 36.9 2.388 2.473 82 15.8 17.9 63.8 4:32 (198, 1)
Sept.25 6 26.44 51 31.7 2.343 2.504 87 15.8 16.2 61.0 4:21 (197, 0)
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Not yet observed in this return. The condition is best. It will keep over 75 deg high until next February in Northern Hemisphere. It will be 13 mag in December.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 2 22.70 43 52.7 1.218 1.941 121 16.2 14.1 34.1 2:37 (180, 11)
Sept.25 2 27.20 45 9.2 1.136 1.904 125 16.0 11.7 29.9 2:14 (180, 10)
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Image:
1999 Sept. 5
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It will keep over 60 deg high until late November, when it will be 18 mag, so we can observe its fading out under good condition.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 18 37.03 35 54.0 1.937 2.334 100 16.1 14.3 113.3 19:16 (174, 19)
Sept.25 18 45.23 35 12.8 1.990 2.357 98 16.2 16.6 111.4 19:22 (169, 19)
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Image:
1999 Feb. 6
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Mother asteroid of Geminids. No astrometric observations have been reported since 1996 December.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 3 55.35 47 55.4 1.207 1.766 105 16.2 22.0 290.9 4:10 (180, 7)
Sept.25 3 38.89 48 40.6 1.175 1.826 113 16.3 26.8 280.8 3:26 (180, 6)
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Image:
1999 May 31
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It will be over 45 deg high and 17 mag until mid November.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 19 24.80 3 1.4 4.904 5.419 115 16.3 5.5 289.6 19:36 (180, 52)
Sept.25 19 22.72 3 13.9 5.016 5.431 109 16.4 4.1 295.0 19:22 (174, 52)
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Appearing at dawn, but not yet observed. It will be 16 mag and locale high in next autumn and winter, but maybe it is much fainter than the ephemeris.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 7 10.11 29 24.7 2.493 2.339 69 16.4 25.0 97.1 4:32 (218, 14)
Sept.25 7 23.07 29 1.0 2.420 2.340 73 16.3 24.0 98.5 4:21 (217, 15)
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Image:
1999 June 30
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We can observe it until October when it fades to 17 mag and becomes 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)
Sept.18 15 24.79 11 28.5 6.106 5.612 56 16.7 9.6 101.7 19:16 (121, 20)
Sept.25 15 29.43 11 15.3 6.202 5.641 52 16.8 10.2 100.2 19:22 (116, 15)
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It was 16.8 mag on Aug. 5, a bit fainter than the ephemeris.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 6 29.05 42 3.6 1.874 1.960 79 16.7 28.9 75.3 4:32 (204, 7)
Sept.25 6 46.29 42 51.7 1.827 1.974 82 16.7 27.3 75.9 4:21 (204, 7)
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It was 17.4 mag on Sept. 12, much fainter than the ephemeris. It tends to be at peak while after the perihelion passage, so it may be bright suddenly after this.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 4 49.75 12 58.3 1.370 1.858 101 17.2 21.6 88.1 4:32 (190, 41)
Sept.25 4 59.48 13 1.5 1.318 1.866 106 17.2 18.9 89.3 4:21 (188, 42)
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It keeps 17.5 mag and 40 deg high until October. A stellar object.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Sept.18 19 42.31 -14 41.5 1.604 2.279 119 17.3 4.1 107.3 19:54 (180, 70)
Sept.25 19 44.99 -14 48.4 1.644 2.245 113 17.3 7.2 95.9 19:29 (180, 70)
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