◎P/2001 X2 = 1929 WW = 2008 R2の連結軌道と予報位置
2007/2008年の検出は，この彗星と小惑星1929 WWとの同定（NK 1070; YC 2431）
が正しいことを確認しました．検出位置には，2001年の出現の軌道（NK 879(= MPC
56802)）から，赤経方向に+125",赤緯方向に+22"のずれがあり，近日点通過時刻へ
の補正値は，儺= -0.15日，1930年と2001年出現時の連結軌道（NK 1070(= YC 2431)）
からは，それぞれ，+15",+3"のずれがあり，儺= -0.015日でした．
202P/1929 WW (see NK 1070; YC 2431) = 2001 X2 = 2008 R2 (Scotti) [Temporary nu
mbered]
Epoch 2009 Feb. 18.0 TT = JDT 2454880.5
T 2009 Feb. 7.00621 TT Nakano
q 2.5270720 (2000.0) P Q
n 0.13430694 Peri. 255.55531 -0.00219010 -0.99995154
a 3.7763341 Node 194.58033 +0.93154024 +0.00144990
e 0.3308134 Incl. 2.18494 +0.36363166 -0.00973685
P 7.34
From 134 observations 1929-2008, mean residual 0".68.
The comet has passed 0.67 AU from Jupiter on 1960 Mar. 24.
The delta-T corrections are -0.15 day from the prediction in NK 879 (MPC
56802) and -0.015 day from the prediction in NK 1070 (= YC 2431).
Residuals in seconds of arc
1929/ 011221 170 (0.2+ 2.3-) 020119 704 0.5+ 0.1+
291127 690(20.6+ 11.7-)Y 011221 170 0.4- 0.0 020119 704 0.7+ 1.2+
291203 690 0.0 0.5- 011222 204 (1.0- 2.1-) 020119 704 0.7+ 0.6+
2001/ 011222 204 0.2- 0.1+ 020124 691 0.4- 0.4+
011214 691 1.3- 0.2- 011222 204 0.4- 0.0 020124 691 0.8+ 0.2+
011214 704 0.5+ 0.6- 011222 372 0.2+ 1.2- 020124 691 0.7+ 0.0
011214 704 0.5+ 0.9- 011222 372 0.1- 1.9- 020201 360 0.6+ 0.4-
011214 691 1.2- 0.8- 011225 291 0.1+ 1.9+ 020201 360 0.3+ 0.1-
011214 704 0.3- 0.2- 011225 291 0.0 1.7+ 020201 402 1.1+ 0.6-
011214 691 0.8- 0.5- 011225 291 0.0 1.6+ 020201 402 0.4- 0.0
011214 704 0.5+ 0.7+ 2002/ 020201 402 1.2- 0.2+
011214 046 1.4- 0.3+ 020104 691 0.7- 0.1+ 020204 608 0.8- 0.9+
011214 046 0.1+ 1.0+ 020104 691 0.5- 0.2- 020204 608 0.0 1.0+
011214 046 0.0 1.5+ 020104 691 0.1- 0.2- 020204 608 0.5- 0.3+
011214 046 1.2- 0.0 020104 046 0.5+ 0.7- 020206 644 0.7+ 0.6+
011214 046 (2.2- 0.3+) 020104 046 1.1- 0.5- 020206 644 0.7+ 0.6+
011214 611 1.0- 0.1+ 020104 046 0.8+ 0.7- 020206 644 0.3+ 0.7+
011215 611 1.0- 0.1- 020104 046 0.4- 0.3- 020207 704 1.7+ 0.1+
011217 734 1.8- 1.4- 020105 608 0.7+ 0.8- 020207 704 0.1+ 0.1+
011217 333 0.2+ 1.4- 020105 608 0.1+ 0.2+ 020207 704 0.2+ 0.4-
011217 333 0.1- 0.5- 020105 608 0.4+ 0.5+ 020211 704 0.1- 0.6-
011217 333 0.6- 0.6+ 020108 291 0.5+ 2.0+ 020211 704 0.1+ 1.0-
011217 734 0.4- 0.5- 020108 291 0.6+ 1.2+ 020211 704 0.6+ 1.1-
011217 691 (0.9+ 2.5+) 020109 704 0.6+ 0.2- 020214 691 0.5+ 0.3+
011217 691 (1.1+ 2.1+) 020109 704 1.4- 0.1- 020214 691 1.5+ 0.2-
011217 691 (0.4+ 2.7+) 020109 704 0.4- 0.4- 020215 691 0.8+ 0.5-
011217 704 0.1+ 1.2+ 020109 704 1.4- 0.2- 020215 691 1.0+ 0.6-
011217 704 0.0 0.0 020109 704 0.6- 0.7- 020215 691 0.9+ 0.7-
011217 704 0.3+ 0.8+ 020111 360 0.0 0.3- 020216 046 1.3+ 0.2-
011217 704 1.0- 0.0 020111 360 0.3+ 0.1- 020216 046 0.7+ 0.4-
011218 734 0.5- 1.3+ 020113 704 0.1- 0.4+ 020216 046 0.8+ 0.0
011218 691 0.5- 0.0 020113 704 0.9- 0.3+ 020318 691 1.3+ 0.5+
011218 691 0.6- 0.1- 020113 704 0.4- 0.6+ 020318 691 (2.7+ 1.1+)
011218 734 0.3- 0.8- 020113 704 1.0- 0.4+ 2007/
011218 691 0.0 0.0 020113 704 0.4- 1.4+ 070913 G96 0.7- 0.4-
011218 360 0.5+ 0.2- 020115 704 0.4+ 0.4- 070913 G96 0.4- 0.5+
011218 360 0.4- 0.3- 020115 704 0.7+ 0.6- 070913 G96 0.3+ 0.7+
011218 360 0.9- 0.6- 020115 704 0.0 0.9- 070913 G96 0.5- 0.2-
011218 104 0.0 0.3- 020116 608 0.1+ 0.1+ 071008 G96 0.8+ 0.6-
011218 104 0.4- 0.4- 020116 608 0.3+ 0.0 071008 G96 1.1+ 0.4+
011218 104 1.1- 0.4- 020116 608 0.1+ 0.8- 071008 G96 0.2- 1.0+
011218 104 (4.4- 0.6-) 020117 046 0.4+ 0.7+ 071008 G96 0.4- 0.2+
011219 691 0.2+ 0.2- 020117 046 1.3+ 0.5+ 2008/
011219 691 0.5+ 0.7- 020117 046 0.3+ 0.4+ 080807 691 0.9+ 0.0
011219 691 0.6+ 0.8- 020117 046 0.2- 0.0 080807 691 0.1+ 0.3-
011220 704 0.5- 0.8+ 020118 704 0.8+ 0.4+ 080807 691 (2.4- 0.1+)
011220 704 0.1- 0.3- 020118 704 0.3+ 0.5- 080905 291 0.0 0.3+
011220 704 0.4+ 0.4+ 020118 704 0.1+ 0.0 080905 291 0.3+ 0.2+
011220 704 1.1- 0.9+ 020118 704 0.3+ 0.5- 080905 291 0.1+ 0.2+
011220 704 0.9- 0.3+ 020119 704 0.0 0.5+
Date/ TT R.A.(2000) Decl. Delta r Daily motion Mag. Moon Age
h h m ｡ , , / PA ｡ m1 ｡
2008 Sept. 1 18 04 31.14 +20 34.6 2.506 2.706 15.4 / 85 19.3 114 .04
2 18 04 32.23 +20 36.0 2.491 2.704 15.2 / 85 19.3 126 .10
3 18 04 33.31 +20 37.3 2.476 2.702 15.0 / 85 19.3 138 .16
4 18 04 34.37 +20 38.6 2.462 2.700 14.8 / 85 19.3 150 .24
5 18 04 35.42 +20 39.8 2.447 2.697 14.6 / 85 19.3 162 .33
6 18 04 36.46 +20 40.9 2.433 2.695 14.4 / 86 19.2 172 .42
7 18 04 37.48 +20 42.0 2.418 2.693 14.1 / 86 19.2 171 .52
8 18 04 38.48 +20 43.0 2.404 2.691 13.9 / 86 19.2 161 .61
9 18 04 39.47 +20 44.0 2.389 2.689 13.7 / 86 19.2 150 .70
10 18 04 40.44 +20 44.9 2.375 2.687 13.5 / 86 19.2 138 .79
11 18 04 41.40 +20 45.7 2.360 2.685 13.2 / 87 19.2 126 .86
12 18 04 42.34 +20 46.5 2.346 2.683 13.0 / 87 19.1 114 .92
13 18 04 43.27 +20 47.2 2.332 2.681 12.7 / 87 19.1 101 .97
14 18 04 44.17 +20 47.8 2.317 2.679 12.5 / 87 19.1 88 .99
15 18 04 45.06 +20 48.4 2.303 2.677 12.2 / 88 19.1 75 1.00
16 18 04 45.94 +20 48.9 2.289 2.675 12.0 / 88 19.1 61 .98
17 18 04 46.79 +20 49.4 2.275 2.673 11.7 / 88 19.1 48 .93
18 18 04 47.63 +20 49.8 2.261 2.671 11.5 / 88 19.0 34 .86
19 18 04 48.44 +20 50.1 2.247 2.670 11.2 / 88 19.0 20 .77
20 18 04 49.24 +20 50.4 2.233 2.668 10.9 / 89 19.0 8 .67
21 18 04 50.02 +20 50.7 2.219 2.666 10.6 / 89 19.0 11 .55
22 18 04 50.78 +20 50.8 2.205 2.664 10.4 / 89 19.0 24 .44
23 18 04 51.52 +20 50.9 2.191 2.662 10.1 / 90 19.0 37 .33
24 18 04 52.24 +20 51.0 2.177 2.660 9.8 / 90 18.9 51 .23
25 18 04 52.94 +20 51.0 2.163 2.658 9.5 / 90 18.9 64 .14
26 18 04 53.61 +20 51.0 2.150 2.656 9.2 / 91 18.9 78 .07
27 18 04 54.27 +20 50.9 2.136 2.654 8.9 / 91 18.9 91 .03
28 18 04 54.90 +20 50.7 2.123 2.653 8.6 / 91 18.9 104 .00
29 18 04 55.51 +20 50.5 2.109 2.651 8.2 / 92 18.9 116 .00
30 18 04 56.10 +20 50.2 2.096 2.649 7.9 / 92 18.8 129 .02
Oct. 1 18 04 56.66 +20 49.9 2.083 2.647 7.6 / 93 18.8 141 .06
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P/2001 X2 (Scotti) = 1929 WW ( ? )
Epoch 2009 Feb. 18.0 TT = JDT 2454880.5
T 2009 Feb. 7.02343 TT Nakano
q 2.5269469 (2000.0) P Q
n 0.13430736 Peri. 255.56297 -0.00227216 -0.99995138
a 3.7763263 Node 194.57737 +0.93154022 +0.00137267
e 0.3308452 Incl. 2.18488 +0.36363121 -0.00976471
P 7.34 (+/- 0.03 day)
From 122 observations 1929-2002, mean residual 0".65.
See note in http://www.oaa.gr.jp/~oaacs/nk/nk1070.htm
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P/2001 X2 (Scotti)
Epoch 2009 Feb. 18.0 TT = JDT 2454880.5
T 2009 Feb. 7.12929 TT Nakano
q 2.5269478 (2000.0) P Q
n 0.13430077 Peri. 255.55600 -0.00214574 -0.99995166
a 3.7764499 Node 194.57709 +0.93154020 +0.00149042
e 0.3308668 Incl. 2.18491 +0.36363204 -0.00971866
P 7.34 (+/- 0.04 day)
From 121 observations 2001 Dec. 14-2002 Mar. 18, mean residual 0".65.
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P/2001 X2 (Scotti) = 1929 WW ( ? )
Epoch 2001 Oct. 18.0 TT = JDT 2452200.5
T 2001 Oct. 14.78075 TT Nakano
q 2.5240346 (2000.0) P Q
n 0.13424671 Peri. 255.93899 -0.01023111 -0.99990115
a 3.7774635 Node 194.65744 +0.93151372 -0.00602370
e 0.3318176 Incl. 2.18436 +0.36356225 -0.01270470
P 7.34
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P/2001 X2 (Scotti)
T 2001 Oct. 14.72295 TT Nakano
q 2.5238704 (2000.0) P Q
n 0.13430257 Peri. 255.94708 -0.00991584 -0.99990449
a 3.7764160 Node 194.63126 +0.93151642 -0.00573632
e 0.3316757 Incl. 2.18425 +0.36356408 -0.01257389
P 7.34
From 119 observations 2001 Dec. 14-2002 Feb. 16.
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P/2001 X2 (Scotti)
T 2001 Oct. 14.38284 TT Nakano
q 2.5226006 (2000.0) P Q
n 0.13423731 Peri. 255.82069 -0.00789982 -0.99992240
a 3.7776399 Node 194.64214 +0.93152278 -0.00385624
e 0.3322284 Incl. 2.18381 +0.36359717 -0.01184563
P 7.34
From 93 observations 2001 Dec. 14-2002 Jan. 24.
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◎P/2001 X2の軌道と予報位置です
彗星は，周期が８年ほどの新周期彗星でした．
P/2001 X2 (Scotti)
T 2001 Sept. 23.30157 TT Nakano
q 2.4698217 (2000.0) P Q
n 0.12603329 Peri. 247.99972 +0.11346301 -0.99349062
a 3.9398456 Node 195.49557 +0.92496562 +0.10934689
e 0.3731171 Incl. 2.17217 +0.36271854 +0.03193199
P 7.82
From 49 observations 2001 Dec. 14-25.
Date/ TT R.A.(2000) Decl. Delta r Daily motion Mag. Moon Age
h h m ｡ , , / PA ｡ m1 ｡
2001 Dec. 28 16 08 07.17 +16 44.9 1.620 2.551 8.7 / 279 18.6 46 .96
29 16 08 06.57 +16 46.3 1.616 2.553 9.0 / 280 18.6 33 .99
30 16 08 05.96 +16 47.8 1.613 2.555 9.2 / 280 18.6 19 1.00
31 16 08 05.32 +16 49.3 1.611 2.556 9.5 / 280 18.6 7 .98
2002 Jan. 1 16 08 04.67 +16 50.9 1.608 2.558 9.7 / 280 18.6 13 .93
2 16 08 04.01 +16 52.6 1.606 2.560 9.9 / 280 18.6 27 .86
3 16 08 03.33 +16 54.4 1.604 2.561 10.1 / 280 18.6 41 .77
4 16 08 02.64 +16 56.3 1.602 2.563 10.3 / 281 18.6 56 .67
5 16 08 01.93 +16 58.2 1.601 2.565 10.5 / 281 18.6 70 .56
6 16 08 01.21 +17 00.1 1.599 2.567 10.6 / 281 18.6 84 .44
7 16 08 00.49 +17 02.1 1.599 2.568 10.8 / 281 18.6 98 .34
8 16 07 59.75 +17 04.2 1.598 2.570 10.9 / 281 18.6 112 .24
9 16 07 59.01 +17 06.3 1.597 2.572 11.0 / 281 18.6 125 .15
10 16 07 58.26 +17 08.5 1.597 2.574 11.1 / 282 18.6 138 .08
11 16 07 57.50 +17 10.7 1.597 2.576 11.1 / 282 18.6 151 .04
12 16 07 56.74 +17 13.0 1.598 2.577 11.2 / 282 18.6 163 .01
13 16 07 55.97 +17 15.2 1.599 2.579 11.2 / 282 18.6 173 .00
14 16 07 55.20 +17 17.6 1.600 2.581 11.3 / 282 18.6 168 .01
15 16 07 54.43 +17 19.9 1.601 2.583 11.3 / 282 18.6 157 .04
16 16 07 53.67 +17 22.3 1.602 2.585 11.2 / 282 18.6 145 .09
17 16 07 52.90 +17 24.7 1.604 2.587 11.2 / 282 18.7 133 .15
18 16 07 52.13 +17 27.1 1.606 2.589 11.2 / 283 18.7 121 .22
19 16 07 51.37 +17 29.5 1.609 2.591 11.1 / 283 18.7 109 .31
20 16 07 50.62 +17 32.0 1.611 2.593 11.0 / 283 18.7 97 .40
21 16 07 49.87 +17 34.4 1.614 2.595 10.9 / 283 18.7 85 .49
22 16 07 49.13 +17 36.9 1.618 2.597 10.8 / 283 18.7 73 .59
23 16 07 48.39 +17 39.3 1.621 2.599 10.7 / 283 18.7 60 .69
24 16 07 47.66 +17 41.8 1.625 2.601 10.5 / 284 18.7 47 .78
25 16 07 46.95 +17 44.3 1.629 2.603 10.4 / 284 18.7 34 .86
26 16 07 46.25 +17 46.7 1.633 2.605 10.2 / 284 18.7 20 .93
27 16 07 45.55 +17 49.1 1.638 2.607 10.0 / 284 18.7 7 .98
28 16 07 44.87 +17 51.6 1.642 2.609 9.8 / 284 18.7 12 1.00
29 16 07 44.21 +17 54.0 1.648 2.611 9.6 / 284 18.8 26 .99
30 16 07 43.56 +17 56.4 1.653 2.613 9.4 / 285 18.8 41 .96
31 16 07 42.93 +17 58.7 1.659 2.615 9.1 / 285 18.8 56 .89
Feb. 1 16 07 42.31 +18 01.1 1.664 2.617 8.9 / 285 18.8 71 .81
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◎C/2001 X2の軌道と予報位置です
久万の中村彰正氏は，12月18日にこの彗星の観測に成功しました．氏のCCD
全光度は，19.1等でした．なお，彗星は，短周期彗星の可能性があります．
C/2001 X2
T 2002 June 20.48866 TT Nakano
q 1.2017475 (2000.0) P Q
Peri. 37.29746 -0.87513690 +0.48382985
Node 171.63049 -0.45421667 -0.81668877
e 1.0 Incl. 2.61440 -0.16680116 -0.31452843
From 28 observations 2001 Dec. 14-Dec. 18.
Date/ TT R.A.(2000) Decl. Delta r Daily motion Mag. Moon Age
h h m ｡ , , / PA ｡ m1 ｡
2001 Dec. 20 15 08 11.25 +16 36.7 1.939 2.818 6.3 / 276 18.4 146 .29
21 15 08 10.82 +16 37.4 1.921 2.807 6.7 / 276 18.4 134 .38
22 15 08 10.35 +16 38.1 1.903 2.796 7.1 / 277 18.4 122 .48
23 15 08 09.86 +16 38.9 1.885 2.785 7.5 / 277 18.3 111 .57
24 15 08 09.35 +16 39.8 1.868 2.774 7.9 / 277 18.3 98 .66
25 15 08 08.81 +16 40.8 1.850 2.763 8.3 / 278 18.2 86 .75
26 15 08 08.24 +16 41.9 1.833 2.752 8.6 / 278 18.2 73 .84
27 15 08 07.64 +16 43.1 1.817 2.741 9.0 / 278 18.2 60 .91
28 15 08 07.02 +16 44.4 1.800 2.730 9.4 / 278 18.1 47 .96
29 15 08 06.37 +16 45.8 1.784 2.719 9.8 / 279 18.1 33 .99
30 15 08 05.70 +16 47.3 1.768 2.708 10.2 / 279 18.1 19 1.00
31 15 08 05.00 +16 48.8 1.752 2.697 10.5 / 279 18.0 7 .98
2002 Jan. 1 15 08 04.27 +16 50.5 1.736 2.686 10.9 / 279 18.0 13 .94
2 15 08 03.52 +16 52.2 1.721 2.674 11.3 / 279 18.0 26 .87
3 15 08 02.74 +16 54.1 1.706 2.663 11.7 / 280 17.9 41 .78
4 15 08 01.94 +16 56.0 1.692 2.652 12.0 / 280 17.9 55 .67
5 15 08 01.12 +16 58.0 1.677 2.641 12.4 / 280 17.8 70 .56
6 15 08 00.27 +17 00.1 1.663 2.630 12.7 / 280 17.8 84 .45
7 15 07 59.39 +17 02.2 1.649 2.619 13.0 / 280 17.8 98 .34
8 15 07 58.50 +17 04.5 1.635 2.608 13.4 / 280 17.7 111 .24
9 15 07 57.58 +17 06.8 1.622 2.597 13.7 / 280 17.7 125 .16
10 15 07 56.64 +17 09.3 1.609 2.586 14.0 / 280 17.7 138 .09
11 15 07 55.68 +17 11.8 1.596 2.575 14.3 / 280 17.6 151 .04
12 15 07 54.70 +17 14.3 1.584 2.564 14.6 / 280 17.6 163 .01
13 15 07 53.70 +17 17.0 1.572 2.553 14.8 / 281 17.6 173 .00
14 15 07 52.68 +17 19.7 1.560 2.542 15.1 / 281 17.5 168 .01
15 15 07 51.64 +17 22.4 1.548 2.531 15.3 / 281 17.5 157 .04
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戻ります。