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Image:
1999 May 20
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It brightened more rapidly than expected, so the I updated the magnitude prediction. It will be unobservable soon. Then it will appear at dawn as 6 mag in late July. After that, it will fade while being higher.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 8 24.01 13 21.9 1.294 0.916 44 6.3 44.7 344.4 21:00 (101, 8)
June 19 8 18.31 17 56.8 1.423 0.837 35 6.0 37.9 342.0 21:03 (110, 4)
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Image:
1999 May 20
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I updated the magnitude prediction to be fainter. The comet will move over the southern sky drastically after this and it turned to be in the evening sky in July.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 23 2.70 -16 15.8 0.915 1.480 99 10.9 66.5 221.2 2:59 (315, 26)
June 19 22 32.27 -23 47.2 0.711 1.471 115 10.3 116.7 225.3 2:58 (332, 26)
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Image:
1999 Feb. 6
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Mother asteroid of Geminids. Now it is too close to the sun and not observable. It will appear at dawn as 14 mag in late June.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 4 39.69 25 19.9 0.866 0.213 9 10.9 134.0 295.4 2:59 (228,-11)
June 19 4 5.16 29 48.9 0.989 0.415 23 12.7 39.4 312.5 2:58 (235, 2)
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Image:
1998 Dec. 13
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Not observable. It will appear again in September as 13 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 4 39.42 18 0.5 2.686 1.698 10 11.7 41.9 85.4 2:59 (234,-16)
June 19 4 59.81 18 18.5 2.693 1.714 12 11.8 41.3 87.3 2:58 (235,-14)
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Image:
1999 Apr. 14
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Brightening rapidly. It reached to 12.5 mag in early June. I updated the magnitude prediction.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 17 19.64 -5 12.0 0.728 1.723 162 12.2 12.7 239.0 0:01 ( 0, 50)
June 19 17 14.36 -6 8.5 0.697 1.690 160 11.7 14.9 229.9 23:24 ( 0, 49)
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Only southern people can observe it. Norhtern 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)
June 12 5 49.65 -62 55.5 8.631 8.624 86 12.0 6.5 94.7 21:00 ( 32,-48)
June 19 5 56.29 -63 1.3 8.682 8.678 86 12.1 6.6 100.1 21:03 ( 31,-50)
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Image:
1999 May 20
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In the Northern Hemisphere, it gets low in late June. 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)
June 12 9 12.26 27 35.3 2.946 2.461 52 12.3 25.3 150.7 21:00 (107, 25)
June 19 9 18.76 25 6.3 3.089 2.520 47 12.5 24.0 148.5 21:03 (108, 19)
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Image:
1999 May 20
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Beginning to be higher in the Northern Hemisphere. It will be 13-14 mag until September under good condition.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 23 45.10 -5 24.8 1.180 1.505 86 12.9 34.8 58.7 2:59 (299, 27)
June 19 23 58.37 -3 20.8 1.157 1.527 89 13.0 32.0 57.3 2:58 (300, 31)
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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)
June 12 8 8.27 -45 0.8 3.843 3.770 78 13.1 8.3 102.4 21:00 ( 52,-26)
June 19 8 13.97 -45 17.4 3.853 3.744 76 13.1 9.6 108.3 21:03 ( 53,-30)
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Image:
1999 May 20
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Small outburst happened and it looked stellar as 14.5 mag on June 5.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 14 48.38 -27 28.7 5.294 6.160 145 13.5 5.0 300.7 21:26 ( 0, 28)
June 19 14 46.33 -27 10.9 5.356 6.158 138 13.6 4.2 305.8 21:03 ( 2, 28)
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Image:
1999 May 12
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It will be too low to observe soon. After appearing again at dawn in December, it will be lower than 20 deg 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)
June 12 9 6.27 6 26.1 2.699 2.309 56 14.3 29.2 112.8 21:00 ( 89, 13)
June 19 9 18.88 5 6.0 2.784 2.334 53 14.4 29.2 113.2 21:03 ( 90, 8)
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Image:
1999 June 4
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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. Some visual observers reported it as 12 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 17 3.35 57 59.0 3.242 3.543 98 14.3 31.2 276.1 23:39 (180, 67)
June 19 16 36.19 58 2.5 3.258 3.532 97 14.3 30.4 266.6 22:44 (180, 67)
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Image:
1998 Dec. 13
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Although it is getting higher in the morning sky, it will be only 18 deg high in July 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)
June 12 23 28.81 -30 3.6 4.970 5.233 99 14.4 10.6 168.6 2:59 (319, 11)
June 19 23 29.62 -31 19.0 4.915 5.281 105 14.4 11.2 175.4 2:58 (325, 13)
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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)
June 12 2 40.92 31 54.7 2.842 2.107 35 15.1 33.1 59.8 2:59 (240, 14)
June 19 2 56.76 33 48.2 2.822 2.127 38 15.2 32.5 60.7 2:58 (240, 17)
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Image:
1999 May 1
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It will be low in late June and the current observation season will finish.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 9 39.77 13 36.4 2.255 1.993 62 15.3 34.4 111.5 21:00 ( 90, 24)
June 19 9 55.13 12 6.1 2.320 2.004 59 15.4 34.7 112.2 21:03 ( 91, 20)
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It was 15 mag on Apr. 21, about 3 mag brighter than the old ephemeris.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 18 54.00 -16 45.0 2.093 3.053 156 15.5 8.0 272.3 1:35 ( 0, 38)
June 19 18 49.83 -16 44.1 2.092 3.082 164 15.6 9.0 269.7 1:04 ( 0, 38)
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Not yet observed in this return. Now is the chance for the first observation. We can observe it as 14 mag from summer though winter under good condition.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 1 26.69 3 6.6 2.265 1.958 59 15.7 35.1 72.1 2:59 (275, 12)
June 19 1 42.33 4 20.7 2.192 1.939 62 15.5 35.0 72.8 2:58 (276, 15)
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Image:
1999 June 4
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New comet. 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)
June 12 21 40.59 36 8.3 4.957 5.137 94 15.6 5.8 21.6 2:59 (260, 73)
June 19 21 41.53 36 44.0 4.869 5.119 98 15.5 4.9 12.7 2:58 (257, 78)
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Image:
1999 June 4
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New comet. Because it is extremely far away, it keeps 15 mag until late 2000, while Northern people can observe it under good condition. Visual observers reported it as 14 mag.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 16 17.80 62 17.9 7.399 7.533 93 15.6 10.5 238.3 22:55 (180, 63)
June 19 16 9.20 61 35.0 7.412 7.529 92 15.6 10.7 231.5 22:19 (180, 63)
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Image:
1999 Jan. 16
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Appearing to be in the morning sky. The brightness after late February is unknown.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 16 52.46 -48 28.0 1.395 2.350 154 15.6 49.5 311.8 23:28 ( 0, 7)
June 19 16 30.12 -44 34.9 1.490 2.442 153 15.9 43.9 318.3 22:39 ( 0, 11)
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Image:
1999 May 31
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New comet. 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)
June 12 19 31.89 -11 51.3 3.950 4.830 146 15.8 13.5 232.5 2:13 ( 0, 43)
June 19 19 26.43 -12 51.5 3.849 4.786 154 15.7 15.1 233.5 1:40 ( 0, 42)
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Not yet observed in this return. Now is the chance for the first observation. We can observe it as 15 mag from summer though winter under good condition.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 2 19.74 20 21.7 2.615 1.974 41 16.0 36.3 60.2 2:59 (253, 11)
June 19 2 35.63 22 26.3 2.557 1.960 44 15.9 36.4 60.9 2:58 (253, 15)
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New comet. 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)
June 12 15 3.97 12 13.9 4.515 5.245 131 16.0 5.7 311.4 21:42 ( 0, 67)
June 19 15 2.18 12 36.6 4.610 5.268 125 16.0 4.3 310.6 21:12 ( 0, 68)
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Image:
1999 June 1
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New comet. 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. It is 14.5 mag visually.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 18 55.97 21 35.3 1.519 2.302 129 16.0 31.2 346.3 1:37 ( 0, 76)
June 19 18 51.76 24 59.2 1.504 2.287 129 16.0 29.3 342.0 1:06 ( 0, 80)
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Image:
1999 Apr. 14
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It was about 16.5 mag in March and April, 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)
June 12 15 51.99 -15 58.5 8.539 9.490 158 16.0 3.9 283.4 22:30 ( 0, 39)
June 19 15 50.25 -15 52.6 8.597 9.500 151 16.0 3.5 282.8 22:00 ( 0, 39)
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First return. Bright and now is the chance to recover. It is already observable in the Southern Hemisphere. Even in the Northern Hemisphere, the comet will be higher after this. It will be brightening slowly and reach to 15 mag in September.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 0 42.85 6 9.0 2.687 2.498 68 16.1 23.9 74.7 2:59 (279, 23)
June 19 0 53.51 6 50.8 2.609 2.496 72 16.0 23.0 75.8 2:58 (281, 27)
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New comet. It will close to the earth down to 0.4 AU in October and reach to 11 mag. In the Northern Hemisphere, people can observe it until mid November. But because the comet is moving southwards, it will just over the horizon after the approach to the earth. It will not be obesrvable after 2000 February. On the other hand, southern people cannot see it until the approach.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 11 24.82 77 2.3 2.085 1.944 67 16.5 27.5 243.0 21:00 (167, 44)
June 19 10 42.37 75 17.2 2.089 1.866 63 16.3 25.3 229.4 21:03 (162, 40)
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Image:
1999 June 4
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Fading as expected. Observation is hard because it is in the Milky Way.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 18 24.91 14 6.2 1.840 2.693 139 16.3 47.8 254.8 1:07 ( 0, 69)
June 19 18 3.17 12 29.0 1.882 2.769 143 16.5 46.7 251.3 0:18 ( 0, 68)
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Image:
1999 May 31
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New comet. 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)
June 12 20 37.37 -4 44.4 4.574 5.271 128 17.0 12.3 310.4 2:59 (352, 50)
June 19 20 32.68 -3 49.4 4.484 5.260 135 17.0 13.2 305.9 2:46 ( 0, 51)
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Image:
1999 May 31
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New comet. Although it is very high, it fades out rapidly as 17.5 mag in late June, 18.5 mag in late July.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 18 2.18 24 30.0 1.509 2.308 131 17.0 50.4 309.0 0:44 ( 0, 79)
June 19 17 42.28 27 46.3 1.582 2.355 128 17.2 44.3 303.6 23:50 ( 0, 83)
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Image:
1999 Mar. 12
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No observations reported since it appeared at dawn, except for Ageo Survey team's one on Mar. 12 (16.4 mag).
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 0 40.46 59 6.9 4.481 4.069 59 17.4 14.8 44.8 2:59 (219, 42)
June 19 0 49.68 60 19.1 4.491 4.117 62 17.4 13.9 42.8 2:58 (217, 44)
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It was 17.7 mag on June 8, as bright as expected.
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Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
June 12 18 0.54 -6 40.3 1.110 2.096 160 17.5 9.7 286.7 0:42 ( 0, 48)
June 19 17 56.06 -6 26.3 1.117 2.110 162 17.6 9.7 277.0 0:10 ( 0, 49)
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