|
Image:
1998 Dec. 13
|
Because it has passed the peak, now fading gradually. The apprent location keeps stable for a while.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 23 1.86 -23 17.0 0.908 1.105 71 9.2 75.3 96.8 18:21 ( 18, 29)
Dec. 26 23 39.08 -23 55.4 0.949 1.143 72 9.5 71.2 92.3 18:25 ( 17, 29)
|
Image:
1998 Dec. 18
|
Although it is rather fainter by CCD, but about 9 mag and easy to see visually. It has two tails, a long anti-tail towards southeast and an ordinary tail towards west.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 13 6.42 -11 15.2 1.578 1.504 67 9.8 29.5 328.0 5:32 (327, 37)
Dec. 26 12 57.67 -8 0.9 1.456 1.573 77 9.8 37.7 324.9 5:35 (337, 44)
|
Image:
1998 Dec. 13
|
Brightening well. Northern people can see it for a long time until next May, although it will low in this winter. Southern people cannot see it.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 18 50.44 38 27.6 2.012 1.806 63 10.1 11.3 24.2 18:21 (120, 28)
Dec. 26 18 53.49 39 49.9 1.985 1.784 63 10.0 14.4 22.4 18:25 (123, 23)
|
Image:
1998 Dec. 13
|
It has become small and faint. There is a sign to fade out more rapidly than the ephemeris in December. It is going lower rapidly. The chance is until the end of December. Southern people cannot see it.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 21 19.39 22 5.7 1.182 1.236 68 10.3 30.4 205.9 18:21 ( 83, 50)
Dec. 26 21 14.22 19 25.9 1.372 1.237 60 10.6 20.5 202.8 18:25 ( 86, 41)
|
Image:
1998 Dec. 19
|
Rapidly brightening while approaching to the earth and the tail is getting greater. Now it is 10 mag visually. It will be 11 mag until next April. Very low for Southern people.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 6 50.04 39 44.2 1.339 2.285 158 10.8 11.2 232.9 1:01 (180, 85)
Dec. 26 6 44.23 38 50.3 1.305 2.265 163 10.6 13.4 229.7 0:28 (180, 86)
|
Image:
1998 Dec. 19
|
It keeps the good condition for a while. It is brightening since October and now 10 mag visually. The tail is getting greater. Very low for Southern people.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 7 25.08 41 9.9 0.864 1.797 152 11.1 2.9 275.9 1:36 (180, 84)
Dec. 26 7 22.47 41 5.2 0.835 1.784 157 11.0 5.7 252.4 1:06 (180, 84)
|
|
Only observable in the Southern Hemisphere. It was bright as 11.0 mag in December.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 6 16.20 -73 41.2 7.276 7.219 82 11.6 8.7 257.0 0:28 ( 0,-19)
Dec. 26 6 2.01 -73 49.3 7.335 7.277 82 11.6 8.5 267.0 23:41 ( 0,-19)
|
Image:
1998 Dec. 13
|
It was 10 mag and diffused in November. It is fading out now and 12 mag in December. C/1997 J2 is close this week.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 21 30.15 -18 16.6 2.062 1.653 52 12.0 44.8 70.3 18:21 ( 43, 24)
Dec. 26 21 50.38 -16 28.2 2.141 1.690 50 12.4 43.6 68.9 18:25 ( 46, 24)
|
Image:
1998 Dec. 13
|
A bit fainter than the ephemeris. It is already fainter than 13 mag, one reported that 15.5 mag by CCD. It locates very low in the southwest at dusk. 88P is close this week.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 21 25.08 -18 0.1 4.629 4.084 51 13.1 11.4 111.5 18:21 ( 44, 24)
Dec. 26 21 30.44 -18 27.3 4.761 4.126 45 13.2 11.7 107.8 18:25 ( 49, 20)
|
Image:
1998 Dec. 13
|
Although 14 mag visually, 16 mag by CCD. It will reach to 7 mag next year but the condition is bad for Northern people.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 23 30.82 4 25.2 2.725 2.868 88 13.8 16.3 229.2 18:21 ( 20, 58)
Dec. 26 23 25.76 3 16.3 2.805 2.797 79 13.7 13.0 226.0 18:25 ( 34, 53)
|
Image:
1998 Dec. 13
|
Brightening well. 14 mag visually and 15 mag by CCD. It will be at conjunction soon and we cannot see it for a year after that. So now is the chance to observe it, but very low at dusk. It is still close to Saturn Nebula (NGC 7009) this week.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 21 11.17 -11 6.7 2.618 2.126 50 14.1 28.4 79.3 18:21 ( 52, 27)
Dec. 26 21 24.71 -10 26.3 2.641 2.087 46 13.9 29.8 78.0 18:25 ( 56, 25)
|
Image:
1998 Dec. 19
|
Still bright as 13 mag both visually and by CCD. Because it has brightened rapidly before perihelion, the ephemeris says it should fade out rapidly after this. However, the recent observations impliy the comet may keeps the current brightness some more. Southern people cannot observe it.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 6 27.40 47 32.8 0.883 1.821 154 14.0 10.0 238.4 0:39 (180, 77)
Dec. 26 6 21.45 46 46.6 0.904 1.848 156 14.3 11.7 227.5 0:05 (180, 78)
|
|
Beginning to be observable. We could not catch it on Dec. 6 as <14.5 mag, on Dec. 13 as <16 mag. So it is not in ourburst now.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 14 50.73 -25 9.8 6.924 6.201 39 14.1 10.1 111.6 5:32 (313, 12)
Dec. 26 14 55.46 -25 35.4 6.846 6.200 45 14.1 9.6 112.1 5:35 (318, 16)
|
Image:
1998 Dec. 5
|
It locates high in the Southern Hemisphere. Now is the last chance to observe in the Northern Hemisphere. Northern people cannot observe it in next year. It was observed as bright as 14.0 mag visually in late November.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 10 5.72 -36 50.3 4.446 4.625 94 14.6 16.1 196.0 4:16 ( 0, 18)
Dec. 26 10 2.58 -38 37.8 4.332 4.585 98 14.4 16.4 202.1 3:46 ( 0, 16)
|
|
Only observable in the Southern Hemisphere. No observations reported recently. It was faint as 14-16 mag between August and October. It is close by SN 1998ew (14 mag).
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 21 20.07 -69 3.3 3.050 2.622 55 14.6 30.8 68.9 18:21 ( 15,-19)
Dec. 26 21 55.65 -67 33.2 3.093 2.658 55 14.7 31.1 63.3 18:25 ( 15,-17)
|
|
Not yet observed in this return. It may be much fainter than the ephemeris. It is too low to observe.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 20 42.60 -24 14.7 2.765 2.110 40 15.1 32.1 59.8 18:21 ( 48, 13)
Dec. 26 20 56.79 -22 19.5 2.797 2.091 36 15.0 32.7 59.4 18:25 ( 52, 12)
|
Image:
1998 Dec. 12
|
14 mag visually, but 16 mag by CCD. Slowly fading although the location will be good for a while. Now is the chance.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 0 49.89 14 27.0 2.059 2.568 110 15.2 10.0 66.3 18:58 ( 0, 69)
Dec. 26 0 54.84 14 57.6 2.149 2.574 104 15.3 12.2 67.4 18:36 ( 0, 70)
|
Image:
1998 Dec. 12
|
14.5 mag visually and 15 mag by CCD. Now is the last chance for observation but getting lower.. Southern people cannnot observe it.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 19 33.80 25 45.9 3.472 3.027 55 15.5 24.8 71.9 18:21 (102, 30)
Dec. 26 19 46.12 26 41.9 3.524 3.059 54 15.6 25.2 70.6 18:25 (105, 27)
|
Image:
1998 Dec. 19
|
Brighter than the ephemeris, 13-14 mag visually and 15.5 mag by CCD. It keeps the current brightness for a while after this.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 4 6.31 -1 37.8 0.848 1.748 145 15.6 26.6 338.3 22:14 ( 0, 54)
Dec. 26 4 2.50 1 22.8 0.863 1.739 140 15.6 27.4 346.6 21:42 ( 0, 57)
|
Image:
1998 Dec. 13
|
Rapidly fading since October. It is already as faint as 16 mag. It has a strange tail towards west (about 1 arcmin).
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 2 27.56 8 36.3 1.784 2.533 130 16.0 2.0 79.0 20:36 ( 0, 64)
Dec. 26 2 29.04 8 42.7 1.941 2.616 123 16.2 4.5 71.7 20:10 ( 0, 64)
|
|
Not yet observed in this return. It should be brightening from 19 mag to 16 mag during the conjunction. Now is the chance to observe it for the first time. It will be at the peak in June and reach to 13 mag, but the altitude keeps only about 15 deg for the Northern people until June.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 14 52.64 -21 6.0 2.649 2.000 40 16.2 35.9 109.8 5:32 (310, 15)
Dec. 26 15 9.91 -22 29.0 2.557 1.956 43 16.0 36.8 108.5 5:35 (313, 16)
|
|
Beginning to be observable at dawn. No observations have been reported since June. It will keep the brightness for a long time after this, but it keeps very low for the Northern people.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 14 13.89 -17 53.8 4.112 3.557 49 16.1 18.7 130.7 5:32 (315, 23)
Dec. 26 14 20.67 -19 18.4 4.048 3.575 54 16.1 18.0 132.0 5:35 (321, 25)
|
Image:
1998 Dec. 12
|
15 mag both visually and by CCD. It will fade soon. Now the position is good, so it is the chance. It is low for the Southern people.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 0 20.51 26 1.5 1.475 2.001 107 16.4 19.9 76.1 18:29 ( 0, 81)
Dec. 26 0 31.05 26 36.3 1.559 2.023 103 16.5 21.7 76.2 18:25 ( 18, 81)
|
Image:
1998 Dec. 11
|
Recovered after 59 years since 1939. All observations in MPEC reported it much fainter as 18-19 mag than the ephemeris. It will fade out gradually after this.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 3 22.69 18 32.9 2.551 3.413 146 16.9 5.7 249.6 21:30 ( 0, 74)
Dec. 26 3 20.54 18 20.8 2.618 3.417 138 16.9 3.7 246.9 21:01 ( 0, 73)
|
Image:
1998 Nov. 29
|
Reported magnitude has a large scatter from 16 to 19 mag. It will keep the current brightness for a while.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 8 23.29 34 55.1 4.049 4.880 144 16.9 20.6 310.8 2:35 ( 0, 90)
Dec. 26 8 13.79 36 28.7 3.987 4.876 151 16.9 21.8 307.4 1:58 (180, 89)
|
Image:
1998 Dec. 19
|
It is around the aphelion now. But the position is good. The recent magnitude is 17-19 mag.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 3 0.77 14 0.1 3.655 4.453 139 17.0 6.2 269.3 21:08 ( 0, 69)
Dec. 26 2 58.16 14 1.1 3.744 4.463 132 17.1 4.6 274.4 20:38 ( 0, 69)
|
Image:
1998 Dec. 19
|
It is around the aphelion now. But the position is good. The recent magnitude is 18-19 mag.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 3 18.01 15 33.8 3.393 4.230 144 17.4 6.5 266.8 21:26 ( 0, 71)
Dec. 26 3 15.24 15 32.7 3.454 4.222 136 17.4 5.0 270.6 20:55 ( 0, 71)
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 1 31.34 12 52.1 1.428 2.090 118 17.6 13.6 72.3 19:40 ( 0, 68)
Dec. 26 1 38.10 13 23.8 1.510 2.106 113 17.7 16.0 72.1 19:19 ( 0, 68)
|
|
Not yet recovered. Because the position is good, it may be fainter than the ephemeris. Delta-T is large as 3.6 days. It should reach to about 17.5 mag soon.
|
Date(TT) R.A. (2000) Decl. Delta r Elong. m1 Mot.(') p.a. Best Time(A, h)
Dec. 19 7 49.21 26 36.4 1.447 2.361 152 17.9 3.6 290.2 2:00 ( 0, 82)
Dec. 26 7 46.78 26 45.4 1.378 2.325 159 17.7 6.0 282.5 1:30 ( 0, 82)
|