◎P/2001 J1の連結軌道です
上尾の門田健一氏は，2008年11月に近日点を通過するこの彗星を10月15日に
検出し，17日にこれを確認しました．氏のCCD全光度は，15日に16.4等，17日に
16.5等と予報光度に良く一致していました．検出時，彗星には，集光のある30"
ほどのコマが見られたとのことです．
検出位置は，予報軌道（NK 802）から赤経方向に+0ﾟ.47，赤緯方向に-0ﾟ.10
のずれがあり，近日点通過時刻の補正値にして儺= -0.54日でした．
207P/2001 J1 = 2008 T5 (NEAT) [Temporary designated and numbered]
Epoch 2008 Oct. 21.0 TT = JDT 2454760.5
T 2008 Nov. 6.25512 TT Nakano
q 0.9441516 (2000.0) P Q
n 0.12857975 Peri. 271.17318 -0.36661584 -0.92828970
a 3.8876546 Node 200.67448 +0.90823787 -0.34259204
e 0.7571411 Incl. 10.14998 +0.20173449 -0.14459920
P 7.67
From 61 observations 2000-2008, mean residual 0".86.
Residuals in seconds of arc
2000/ 010513 118 0.9+ 1.4- 010517 926 0.3+ 1.1+
001007 691 0.1- 0.6- 010513 118 1.2+ 0.5+ 010517 867 0.7- 0.3+
001007 691 0.2+ 0.0 010513 118 0.1+ 0.4- 010517 867 1.1- 0.5+
001007 691 0.1+ 0.1- 010513 046 0.1+ 0.9+ 010517 867 0.7+ 0.2-
2001/ 010513 046 (0.3- 2.1+) 010517 402 (7.5+ 2.6-)
010511 608 0.7- 0.2+ 010513 046 (0.7+ 2.5+) 010517 402 (1.3- 2.6-)
010511 608 0.6- 0.0 010513 046 (2.4- 2.1+) 010517 402 (2.0- 0.6-)
010511 608 1.1- 0.6- 010513 046 (4.5+ 2.5+) 010517 402 0.7- 0.7+
010511 557 1.7+ 1.1- 010514 649 0.2- 0.0 010519 360 0.7- 0.2-
010511 557 0.5+ 1.0- 010514 649 1.2+ 0.3- 010519 360 0.6- 0.2+
010511 557 1.6- 0.7- 010514 649 0.2+ 0.1- 010519 360 1.1- 0.5-
010511 046 (3.9- 2.7+) 010515 926 1.5- 1.4+ 010519 300 0.3+ 0.9+
010511 046 (3.7- 1.3+) 010515 926 (1.1- 2.1+) 010519 300 (2.8+ 3.4-)
010511 046 (2.0- 1.7-) 010515 926 1.6- 1.2+ 010519 046 (1.1+ 2.1-)
010511 046 0.2- 1.7- 010515 926 0.8- 1.0+ 010519 046 1.3+ 1.8-
010511 046 0.3+ 1.5- 010515 926 1.7- 1.4+ 010519 046 0.1- 0.1-
010512 649 0.3- 0.0 010516 360 0.5- 0.7+ 010519 046 1.0+ 0.1-
010512 649 0.6+ 0.0 010516 360 0.7+ 1.0+ 010527 290 0.0 0.6+
010512 046 1.2+ 0.6- 010516 360 0.9+ 0.1+ 010527 290 0.4+ 0.8+
010512 046 0.8- 0.4+ 010516 046 (0.4- 2.3+) 010527 290 0.0 0.7+
010512 046 (2.3- 0.1+) 010516 046 1.7+ 0.2- 2008/
010512 046 0.1+ 0.2- 010516 046 0.9+ 1.9+ 081015 349 0.6- 0.0
010512 118 (3.3- 0.2+) 010516 046 0.4+ 0.5+ 081015 349 0.5- 0.3-
010512 201 (2.0+ 1.2-) 010516 046 (2.6- 0.6+) 081015 349 0.0 0.6-
010512 118 0.7- 1.4- 010516 046 1.4+ 0.7+ 081017 349 0.6+ 0.4+
010512 201 (5.9+ 1.2+) 010517 926 1.2+ 1.8- 081017 349 0.5+ 0.6+
010513 734 0.8+ 1.1- 010517 926 1.9- 1.2- 081017 349 0.2+ 0.7+
010513 734 0.3- 1.2- 010517 926 (1.3- 2.0+)
010513 734 (1.1- 2.6-) 010517 926 0.4- 0.8+
Date/ TT R.A.(2000) Decl. Delta r Daily motion Mag. Moon Age
h h m ｡ , , / PA ｡ m1 ｡
2008 Oct. 15 18 09 28.77 +05 25.9 0.995 1.000 81.9 / 110 16.5 108 .99
16 18 09 33.91 +04 57.1 0.997 0.995 81.6 / 111 16.5 95 .95
17 18 09 39.01 +04 28.3 0.999 0.990 81.2 / 111 16.5 82 .88
18 18 09 44.09 +03 59.5 1.002 0.986 80.8 / 111 16.4 69 .80
19 18 09 49.13 +03 30.8 1.004 0.982 80.4 / 111 16.4 56 .69
20 18 09 54.15 +03 02.1 1.007 0.978 80.0 / 111 16.4 43 .58
21 18 09 59.13 +02 33.4 1.011 0.974 79.5 / 111 16.4 31 .47
22 18 10 04.08 +02 04.9 1.014 0.970 79.0 / 111 16.4 19 .36
23 18 10 09.00 +01 36.5 1.018 0.967 78.5 / 111 16.4 9 .26
24 18 10 13.89 +01 08.2 1.022 0.964 78.0 / 111 16.4 10 .18
25 18 10 18.74 +00 40.1 1.026 0.961 77.4 / 111 16.4 20 .10
26 18 10 23.55 +00 12.2 1.030 0.958 76.9 / 111 16.4 30 .05
27 18 10 28.33 -00 15.5 1.034 0.955 76.3 / 111 16.4 42 .02
28 18 10 33.08 -00 43.0 1.039 0.953 75.7 / 111 16.4 53 .00
29 18 10 37.79 -01 10.3 1.044 0.951 75.1 / 111 16.4 63 .01
30 18 10 42.46 -01 37.3 1.049 0.949 74.5 / 111 16.4 74 .03
31 18 10 47.10 -02 04.0 1.054 0.948 73.9 / 111 16.4 85 .07
Nov. 1 18 10 51.70 -02 30.4 1.059 0.947 73.2 / 111 16.4 95 .13
2 18 10 56.27 -02 56.6 1.065 0.946 72.6 / 111 16.4 106 .20
3 18 11 00.80 -03 22.4 1.070 0.945 72.0 / 111 16.4 116 .28
4 18 11 05.29 -03 47.9 1.076 0.944 71.3 / 111 16.4 127 .36
5 18 11 09.75 -04 13.1 1.082 0.944 70.7 / 111 16.4 138 .46
6 18 11 14.18 -04 38.0 1.088 0.944 70.0 / 111 16.4 149 .56
7 18 11 18.56 -05 02.5 1.094 0.944 69.3 / 110 16.4 160 .66
8 18 11 22.91 -05 26.7 1.100 0.945 68.7 / 110 16.5 171 .75
9 18 11 27.23 -05 50.5 1.106 0.946 68.0 / 110 16.5 173 .84
10 18 11 31.51 -06 14.0 1.112 0.947 67.4 / 110 16.5 162 .91
11 18 11 35.76 -06 37.1 1.119 0.948 66.7 / 110 16.5 149 .97
12 18 11 39.97 -06 59.8 1.125 0.949 66.0 / 110 16.5 135 .99
13 18 11 44.14 -07 22.2 1.132 0.951 65.4 / 110 16.6 121 .99
14 18 11 48.28 -07 44.2 1.138 0.953 64.7 / 110 16.6 107 .97
15 18 11 52.39 -08 05.8 1.145 0.955 64.1 / 109 16.6 93 .91
16 18 11 56.46 -08 27.1 1.151 0.958 63.4 / 109 16.6 80 .83
17 18 12 00.50 -08 48.0 1.158 0.961 62.8 / 109 16.6 66 .73
18 18 12 04.50 -09 08.5 1.165 0.963 62.1 / 109 16.7 53 .63
19 18 12 08.47 -09 28.6 1.171 0.967 61.5 / 109 16.7 40 .52
20 18 12 12.41 -09 48.4 1.178 0.970 60.8 / 109 16.7 28 .41
21 18 12 16.31 -10 07.7 1.185 0.974 60.2 / 108 16.8 16 .31
22 18 12 20.17 -10 26.7 1.191 0.977 59.5 / 108 16.8 5 .22
23 18 12 24.01 -10 45.4 1.198 0.982 58.9 / 108 16.8 8 .14
24 18 12 27.81 -11 03.6 1.205 0.986 58.2 / 108 16.8 19 .08
25 18 12 31.57 -11 21.5 1.211 0.990 57.6 / 108 16.9 30 .04
26 18 12 35.31 -11 39.0 1.218 0.995 56.9 / 108 16.9 41 .01
27 18 12 39.00 -11 56.1 1.224 1.000 56.3 / 107 16.9 52 .00
28 18 12 42.67 -12 12.9 1.231 1.005 55.7 / 107 17.0 63 .01
29 18 12 46.30 -12 29.3 1.237 1.010 55.1 / 107 17.0 74 .04
30 18 12 49.90 -12 45.3 1.244 1.016 54.4 / 107 17.0 85 .08
Dec. 1 18 12 53.46 -13 01.0 1.250 1.021 53.8 / 107 17.1 96 .14
NAKANO
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write mail from CFAD0::NAKANO on 2008-10-18 06:17:23(JST).
P/2001 J1 (NEAT)
Epoch 2001 Apr. 1.0 TT = JDT 2452000.5
T 2001 Mar. 14.10555 TT Nakano
q 0.9370699 (2000.0) P Q
n 0.12909218 Peri. 271.02538 -0.36613868 -0.92845068
a 3.8773597 Node 200.79540 +0.90845175 -0.34204723
e 0.7583227 Incl. 10.15958 +0.20163802 -0.14485516
P 7.63
From 55 observations 2000 Oct. 7-2001 May 27, mean residual 0".86.
NAKANO
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write mail from CFAD0::NAKANO on 2001-07-03 00:46:31(JST).
P/2001 J1 (NEAT)
Epoch 2001 Apr. 1.0 TT = JDT 2452000.5
T 2001 Mar. 14.10558 TT Nakano
q 0.9370704 (2000.0) P Q
n 0.12909943 Peri. 271.02526 -0.36614311 -0.92844895
a 3.8772146 Node 200.79579 +0.90844937 -0.34205105
e 0.7583135 Incl. 10.15938 +0.20164069 -0.14485729
P 7.63
From 62 observations 2000 Oct. 7-2001 May 27, mean residual 0".98.
NAKANO
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write mail from CFAD0::NAKANO on 2001-06-02 22:39:55(JST).
C/2001 J1 (NEAT)
T 2001 Mar. 20.42185 TT Nakano
q 1.0095627 (2000.0) P Q
Peri. 279.49515 -0.45774564 -0.88728271
Node 198.07741 +0.87037478 -0.43422584
e 1.0 Incl. 10.50107 +0.18142954 -0.15549053
From 52 observations 2001 May 11-19.
Date/ TT R.A.(2000) Decl. Delta r Daily motion Mag. Moon Age
h h m ｡ , , / PA ｡ m1 ｡
2001 May 15 12 08 59.14 +12 57.2 1.146 1.373 69.4 / 98 17.7 166 .49
16 12 09 03.83 +12 47.0 1.158 1.384 68.5 / 99 17.7 156 .40
17 12 09 08.45 +12 36.5 1.169 1.395 67.6 / 99 17.8 145 .31
18 12 09 13.01 +12 25.9 1.182 1.406 66.7 / 99 17.8 134 .22
19 12 09 17.51 +12 15.0 1.194 1.417 65.9 / 100 17.9 123 .14
20 12 09 21.93 +12 03.9 1.207 1.428 65.0 / 100 18.0 112 .08
21 12 09 26.29 +11 52.6 1.220 1.439 64.1 / 100 18.0 100 .03
22 12 09 30.59 +11 41.1 1.233 1.450 63.3 / 100 18.1 87 .01
23 12 09 34.82 +11 29.5 1.246 1.461 62.4 / 101 18.1 75 .00
24 12 09 38.99 +11 17.8 1.260 1.472 61.6 / 101 18.2 62 .02
25 12 09 43.09 +11 05.9 1.274 1.483 60.7 / 101 18.2 49 .07
26 12 09 47.14 +10 53.9 1.288 1.495 59.9 / 102 18.3 36 .14
27 12 09 51.12 +10 41.8 1.303 1.506 59.1 / 102 18.4 23 .23
28 12 09 55.04 +10 29.6 1.318 1.517 58.3 / 102 18.4 11 .34
29 12 09 58.90 +10 17.3 1.333 1.529 57.5 / 102 18.5 8 .45
30 12 10 02.70 +10 05.0 1.348 1.540 56.7 / 103 18.5 19 .57
31 12 10 06.44 +09 52.6 1.363 1.552 55.9 / 103 18.6 31 .68
June 1 12 10 10.13 +09 40.1 1.379 1.563 55.1 / 103 18.6 44 .78
2 12 10 13.76 +09 27.6 1.395 1.575 54.4 / 103 18.7 57 .86
3 12 10 17.33 +09 15.1 1.411 1.587 53.6 / 103 18.8 69 .93
4 12 10 20.85 +09 02.5 1.427 1.598 52.9 / 104 18.8 81 .97
5 12 10 24.32 +08 49.9 1.444 1.610 52.2 / 104 18.9 94 1.00
6 12 10 27.74 +08 37.3 1.461 1.622 51.5 / 104 18.9 105 1.00
7 12 10 31.10 +08 24.7 1.477 1.634 50.8 / 104 19.0 117 .98
8 12 10 34.42 +08 12.1 1.495 1.645 50.1 / 104 19.0 129 .94
9 12 10 37.69 +07 59.5 1.512 1.657 49.5 / 105 19.1 140 .89
10 12 10 40.91 +07 46.9 1.529 1.669 48.8 / 105 19.1 151 .82
11 12 10 44.09 +07 34.4 1.547 1.681 48.2 / 105 19.2 162 .74
12 12 10 47.22 +07 21.8 1.565 1.693 47.6 / 105 19.3 172 .65
13 12 10 50.30 +07 09.3 1.583 1.705 47.0 / 105 19.3 173 .56
14 12 10 53.35 +06 56.8 1.601 1.716 46.4 / 106 19.4 164 .47
15 12 10 56.35 +06 44.3 1.619 1.728 45.8 / 106 19.4 153 .37
ところで，3D/Bielaとの同定の可能性ですが，たとえば，Ｂ核の私の次の予報
軌道（この核の方が多少，近日点通過が遅くなる）の軌道長半径を使用して，
T= 1999 Jan, q= 0.824 AU, e= 0.767, Peri.= 268.46, Node= 200.83, Inc.= 8.07
長半径を固定して軌道改良を行なうと，下の軌道が得られます．なお，多分，1852年
には，Ａ核の方が明るかったものと思われますが，明るいものが大きい核とは，
限りません．たとえ大きくとも，多量のガスを放出したため，早く，小さくなる
こともありえます．
C/2001 J1 (NEAT); a-assumed orbit.
T 2001 Mar. 13.36989 TT Nakano
q 0.9293246 (2000.0) P Q
n 0.14845347 Peri. 269.97553 -0.35385513 -0.93316053
a 3.5324483 Node 201.09112 +0.91273559 -0.32976816
e 0.7369177 Incl. 10.11995 +0.20420649 -0.14305379
P 6.64
From 52 observations 2001 May 11-19.
NAKANO
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write mail from CFAD0::NAKANO on 2001-05-21 04:48:54(JST).
◎C/2001 J1の軌道と予報位置です
3D/Bielaと同定できる可能性があります．ぜひ，追跡観測してください．
C/2001 J1 (NEAT)
T 2001 Mar. 19.88859 TT Nakano
q 1.0010408 (2000.0) P Q
Peri. 278.65636 -0.44210019 -0.89519356
Node 197.91093 +0.87805149 -0.41908818
e 1.0 Incl. 10.55892 +0.18322938 -0.15163639
From 32 observations 2001 May 11-15.
Date/ TT R.A.(2000) Decl. Delta r Daily motion Mag. Moon Age
h h m ｡ , , / PA ｡ m1 ｡
2001 May 15 12 08 59.14 +12 57.2 1.149 1.375 69.3 / 98 16.7 166 .49
16 12 09 03.82 +12 47.0 1.160 1.386 68.4 / 99 16.7 156 .40
17 12 09 08.44 +12 36.6 1.172 1.397 67.5 / 99 16.8 145 .31
18 12 09 13.00 +12 25.9 1.185 1.408 66.6 / 99 16.9 134 .22
19 12 09 17.48 +12 15.0 1.197 1.419 65.7 / 100 16.9 123 .14
20 12 09 21.90 +12 04.0 1.210 1.430 64.8 / 100 17.0 112 .08
21 12 09 26.25 +11 52.7 1.223 1.441 64.0 / 100 17.0 100 .03
22 12 09 30.54 +11 41.3 1.237 1.452 63.1 / 100 17.1 87 .01
23 12 09 34.76 +11 29.7 1.250 1.464 62.2 / 101 17.1 75 .00
24 12 09 38.91 +11 18.0 1.264 1.475 61.4 / 101 17.2 62 .02
25 12 09 43.01 +11 06.2 1.279 1.486 60.5 / 101 17.3 49 .07
26 12 09 47.04 +10 54.2 1.293 1.498 59.7 / 102 17.3 36 .14
27 12 09 51.00 +10 42.2 1.308 1.509 58.9 / 102 17.4 23 .23
28 12 09 54.91 +10 30.0 1.323 1.521 58.0 / 102 17.4 10 .34
29 12 09 58.76 +10 17.8 1.338 1.532 57.2 / 102 17.5 8 .45
30 12 10 02.54 +10 05.5 1.353 1.544 56.4 / 103 17.5 19 .57
31 12 10 06.27 +09 53.1 1.369 1.556 55.7 / 103 17.6 31 .68
June 1 12 10 09.94 +09 40.7 1.385 1.567 54.9 / 103 17.7 44 .78
2 12 10 13.56 +09 28.3 1.401 1.579 54.1 / 103 17.7 57 .86
3 12 10 17.11 +09 15.8 1.417 1.591 53.4 / 103 17.8 69 .93
4 12 10 20.62 +09 03.3 1.434 1.602 52.7 / 104 17.8 82 .97
5 12 10 24.07 +08 50.8 1.450 1.614 51.9 / 104 17.9 94 1.00
6 12 10 27.47 +08 38.3 1.467 1.626 51.2 / 104 17.9 105 1.00
7 12 10 30.82 +08 25.8 1.484 1.638 50.6 / 104 18.0 117 .98
8 12 10 34.12 +08 13.2 1.502 1.650 49.9 / 104 18.1 129 .94
9 12 10 37.37 +08 00.7 1.519 1.662 49.2 / 105 18.1 140 .89
10 12 10 40.58 +07 48.2 1.537 1.674 48.6 / 105 18.2 151 .82
11 12 10 43.74 +07 35.7 1.554 1.685 48.0 / 105 18.2 162 .74
12 12 10 46.85 +07 23.2 1.572 1.697 47.3 / 105 18.3 172 .65
13 12 10 49.92 +07 10.8 1.591 1.709 46.7 / 105 18.3 173 .56
14 12 10 52.95 +06 58.3 1.609 1.721 46.2 / 106 18.4 164 .47
15 12 10 55.94 +06 46.0 1.627 1.733 45.6 / 106 18.4 152 .37
NAKANO
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write mail from CFAD0::NAKANO on 2001-05-17 05:02:47(JST).
戻ります。