◎P/1998 X1 = 2006 B7 (ODAS)の連結軌道
2005年の観測が報告され，氷の昇華による非重力効果の係数が信頼できるほど
十分小さくなったので，新しい連結軌道を計算しました．
198P/ODAS (1998 X1 = 2006 B7); [Temporary numbered]
Epoch 2005 Apr. 20.0 TT = JDT 2453480.5
T 2005 May 3.25918 TT Nakano
q 1.9808484 (2000.0) P Q
n 0.14529644 Peri. 69.05231 +0.37817858 -0.92573251
a 3.5834339 Node 358.72643 +0.84036201 +0.34354004
e 0.4472206 Incl. 1.34839 +0.38829455 +0.15811246
P 6.78 (+/- 0.04 day)
From 186 observations 1998-2006, mean residual 0".60.
Nongravitational parameters A1 = -2.41 +/- 0.35, A2 = +1.0205 +/- 0.3479,
A3 = -2.29 +/- 0.04.
Orbit will be changed to q= 3.357 AU, e= 0.231, Peri.= 189.5, Node= 240.5,
i= 8.8 since the comet will pass 0.15 AU from Jupiter on 2042 Sept. 24
Residuals in seconds of arc
1998/ 981221 360 0.5+ 0.2+ 990213 691 0.5+ 0.7+
981215 910 0.3+ 0.4- 981221 360 0.1- 0.5+ 990214 693 0.1+ 0.2-
981215 910 0.1- 0.8- 981222 958 0.6+ 0.9+ 990214 693 0.2+ 0.3-
981215 910 0.5+ 0.8- 981222 958 0.8- 0.5+ 990214 693 0.1+ 0.3-
981216 046 0.5- 0.3+ 981222 958 0.4+ 0.1+ 990214 360 0.2+ 0.5-
981216 046 0.7- 0.6- 981224 360 0.2- 0.1+ 990214 360 0.3+ 0.3-
981216 046 0.5+ 1.0- 981224 360 0.5- 0.6+ 990214 360 0.1+ 0.7-
981216 557 0.5- 0.5- 981224 360 0.4+ 0.1+ 990215 118 0.2+ 0.3-
981216 910 0.5+ 0.2- 981226 910 0.1- 0.3- 990215 118 0.2- 0.2+
981216 046 0.5- 1.2- 981227 958 (0.1- 4.0+) 990216 691 0.8- 0.5-
981216 046 1.0- 1.4- 981227 958 1.9- 0.6+ 990216 691 0.2- 0.0
981216 910 0.2+ 0.1- 981227 402 0.3+ 0.0 990216 691 1.2- 0.2-
981216 910 0.0 0.4- 981227 402 0.1+ 0.4- 990216 615 0.4+ 0.5+
981216 910 0.1- 0.5- 981227 402 0.6+ 0.1+ 990216 615 0.8+ 0.3-
981216 910 0.4- 1.1- 1999/ 990216 615 0.1- 0.1+
981216 586 0.7+ 0.3+ 990107 897 1.6- 1.7+ 990216 615 0.3+ 0.2+
981216 910 0.1- 0.6- 990107 897 0.2+ 1.4+ 990216 615 0.1- 0.1+
981216 586 0.6+ 0.5+ 990107 897 0.4- 1.6+ 990216 615 0.2- 0.1-
981216 586 0.6+ 0.3+ 990110 372 0.4- 1.3+ 990216 615 0.4- 0.1+
981216 586 0.8+ 0.5+ 990113 693 0.6- 0.0 990216 615 0.8- 0.7+
981216 586 0.6+ 0.3+ 990113 693 0.6- 0.0 990216 615 0.2+ 0.1+
981216 586 0.4+ 0.3+ 990113 693 0.4- 0.1- 990216 615 0.1+ 0.5+
981216 586 0.3+ 0.5+ 990114 910 0.9+ 0.0 990216 615 0.1- 0.5+
981216 586 0.4+ 0.5+ 990114 910 1.0+ 0.5- 990216 615 0.7- 0.3+
981216 586 0.8+ 0.5+ 990114 910 0.4- 0.9- 990216 615 0.2- 0.2+
981216 586 0.7+ 0.4+ 990115 910 0.1+ 0.9- 990216 615 0.2- 0.1+
981216 586 0.5+ 0.5+ 990115 910 0.7+ 0.7- 990216 615 0.2+ 0.5+
981216 586 0.6+ 0.6+ 990115 910 0.8+ 1.3- 990223 897 (1.2+ 2.6+)
981216 586 0.6+ 0.6+ 990115 910 0.0 1.5- 990223 897 (3.2+ 0.1-)
981216 611 0.2+ 0.7- 990115 910 0.2+ 1.3- 990223 897 0.5+ 0.9-
981217 611 (2.6- 0.8-) 990115 910 0.2- 0.5- 990316 402 0.3- 0.2+
981217 586 0.6- 0.2+ 990115 910 0.1- 1.1- 990316 402 (0.5- 2.5-)
981217 586 0.1+ 0.3+ 990119 910 0.2+ 0.4+ 990316 402 1.9- 1.3-
981217 046 0.9- 0.3- 990119 910 0.4+ 0.2+ 990404 402 2.0- 0.2-
981217 586 0.1- 0.0 990119 910 0.5+ 0.0 990404 402 0.3- 0.5-
981217 046 0.8- 0.3+ 990119 910 0.4- 0.0 990414 693 (2.5- 1.0-)
981217 046 0.3+ 0.0 990119 910 0.1+ 0.2+ 990414 693 (5.4- 0.3+)
981217 586 0.0 0.2+ 990119 910 0.0 0.2+ 2005/
981217 046 0.2+ 0.0 990119 910 0.0 0.1+ 051007 G96 1.6- 1.9-
981217 046 0.7+ 0.1- 990119 910 0.2+ 0.2+ 051007 G96 0.7- 1.4-
981217 586 0.5- 0.2+ 990119 910 0.2+ 0.0 051007 G96 0.9- 0.9-
981217 586 0.2- 0.3+ 990119 910 0.0 0.6+ 051007 G96 0.9+ 1.7-
981217 586 0.5- 0.4+ 990121 360 0.7+ 0.6- 2006/
981217 586 0.3- 0.3+ 990121 360 0.5+ 0.2- 060130 691 0.1- 0.0
981217 586 0.5- 0.4+ 990121 360 0.2+ 0.3- 060130 691 0.4- 0.3-
981217 586 0.6- 0.2+ 990126 402 (2.3+ 0.8+) 060130 691 0.4- 0.4-
981217 586 0.1- 0.4+ 990126 360 0.4+ 0.1+ 060207 691 0.4- 0.2+
981217 586 0.0 0.2+ 990126 360 0.2- 0.3- 060207 691 0.3- 0.0
981218 511 0.1+ 0.6+ 990126 360 0.5+ 0.2- 060207 691 0.0 0.1+
981218 511 0.0 0.5+ 990205 897 0.7+ 0.0 060220 691 0.3+ 0.0
981218 511 0.1- 0.3+ 990205 897 0.5- 1.1- 060220 691 0.0 0.0
981218 511 0.1- 0.4+ 990206 402 0.3+ 0.7- 060220 691 0.0 0.3+
981218 511 0.2- 0.5+ 990206 402 0.8+ 0.3- 060224 691 0.3+ 0.4+
981218 511 0.1+ 0.5+ 990206 402 1.3+ 0.5+ 060224 691 0.3+ 0.2+
981218 511 0.1- 0.5+ 990208 402 1.4+ 0.7- 060224 691 0.7+ 0.9-
981218 511 0.1- 0.7+ 990208 402 1.5+ 0.3- 060302 691 0.2- 0.1+
981218 511 0.1- 0.6- 990208 402 1.3+ 0.6- 060302 691 0.6+ 0.5+
981218 402 0.8- 0.5+ 990212 699 0.6- 0.9+ 060302 691 0.4+ 0.4+
981218 402 0.6- 0.3+ 990212 699 0.3- 0.1+ 060323 G96 1.0- 0.3+
981218 402 0.3+ 0.2+ 990212 699 0.1- 0.0 060323 G96 0.6+ 0.2+
981218 402 0.5- 0.6+ 990213 691 0.5- 0.1- 060323 G96 1.0- 0.4+
981219 897 0.8- 1.6- 990213 691 0.6- 0.2- 060323 G96 0.5+ 0.4+
981219 897 (3.2- 1.7-) 990213 691 0.1+ 0.1+ 060324 G96 0.1+ 0.1+
981219 372 (1.0+ 2.2+) 990213 691 0.2- 0.2- 060324 G96 1.3+ 0.0
981219 372 0.7+ 1.8+ 990213 691 0.7- 0.5+ 060324 G96 0.4- 0.1+
981220 897 (3.7- 0.2-) 990213 691 0.5- 0.5- 060324 G96 0.1+ 0.4+
981221 372 (2.5+ 0.5+) 990213 691 0.8- 0.8+
981221 360 0.8+ 0.8+ 990213 691 0.3- 0.2-
NAKANO
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◎P/1998 X1 = 2006 B7 (ODAS)の軌道
IAUC 8929とIAUC 8930にあるとおり，1998年出現のこの彗星が2006年に行なわ
れていたキットピークとレモン山の観測中に見つけられました．IAUCに紹介され
ているとおり，重力のみによる２回の出現の連結軌道では，約5"の残差のずれが
生じます．従来よりの非重力効果（氷の気化）でＡ３項まで加えるとそのずれは
消えますが，係数がA1 = +15.81, A2 = -0.3861 and A3 = -2.07と大きいもので
す．非重力効果がCOの気化によるものとすると，その係数は，Y1 = +3.87, Y2 =
+0.1036, Y3 = -1.72まで小さくできます．ただし，これは，COの気化は，その軌
道の全周で起きていますから，当然の結果です．
Following observations were included:
12C103 C1999 02 12.18392 09 31 58.68 +16 02 51.9 17.8 Rc 699
12C103 C1999 02 12.20944 09 31 57.33 +16 02 56.7 c 699
12C103 C1999 02 12.23499 09 31 55.97 +16 03 02.2 c 699
198P/1998 X1 = 2006 B7 (ODAS) [Temporary numbered]
Epoch 2005 Apr. 20.0 TT = JDT 2453480.5
T 2005 May 3.11104 TT Nakano
q 1.9812179 (2000.0) P Q
n 0.14537172 Peri. 68.95751 +0.37827623 -0.92569264
a 3.5821968 Node 358.81521 +0.84033161 +0.34361455
e 0.4469265 Incl. 1.34834 +0.38826521 +0.15818401
P 6.78 (+/- 0.03 day)
From 183 observations 1998-2006, mean residual 0".56.
Nongravitational parameters Y1 = +3.87 +/- 0.65, Y2 = +0.1036 +/- 0.0418,
Y3 = -1.72 +/- 0.03. Sublimating molecule = CO (or N2) using Yabushita's
theory (MN 283, 347).
Water-Ice vaporization gives A1 = +15.81, A2 = -0.3861 and A3 = -2.07.
Orbit will be changed to q= 3.341 AU, e= 0.232, Peri.= 189.3, Node= 240.7,
Inc.= 8.7 since the approach to Jupiter (0.15 AU) on 2042 Sept..
NAKANO
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write mail from CFAD0::NAKANO on 2008-04-02 02:34:22(JST).
P/1998 X1 (ODAS)
Epoch 2005 Apr. 20.0 TT = JDT 2453480.5
T 2005 May 2.52901 TT Nakano
q 1.9810287 (2000.0) P Q
n 0.14535234 Peri. 69.02995 +0.37817745 -0.92573298
a 3.5825151 Node 358.74886 +0.84035621 +0.34353250
e 0.4470285 Incl. 1.34951 +0.38830820 +0.15812611
P 6.78 (+/- 0.05 day)
From 157 observations 1998 Dec. 15-1999 Apr. 14, mean residual 0".58.
NAKANO
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write mail from CFAD0::NAKANO on 2002-05-10 00:07:37(JST).
P/1998 X1 (ODAS)
Epoch 1998 July 6.0 TT = JDT 2451000.5
T 1998 July 20.93373 TT Nakano
q 1.9744650 (2000.0) P Q
n 0.14570785 Peri. 68.79911 +0.38045093 -0.92480098
a 3.5766855 Node 358.83895 +0.83949722 +0.34557488
e 0.4479624 Incl. 1.35214 +0.38794523 +0.15912618
P 6.76
From 154 observations 1998 Dec. 15-1999 Apr. 14, mean residual 0".57.
NAKANO
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write mail from CFAD0::NAKANO on 1999-09-28 01:08:24(JST).
P/1998 X1 (ODAS)
Epoch 1998 Aug. 15.0 TT = JDT 2451040.5
T 1998 July 20.93621 TT Nakano
q 1.9745024 (2000.0) P Q
n 0.14571734 Peri. 68.80160 +0.38039770 -0.92482288
a 3.5765301 Node 358.83976 +0.83951727 +0.34552648
e 0.4479279 Incl. 1.35212 +0.38795404 +0.15910404
P 6.76
From 146 observations 1998 Dec. 15-1999 Mar. 16, mean residual 0".52.
P/1998 X1 (ODAS)
T 1998 July 20.90590 TT Nakano
q 1.9750237 (2000.0) P Q
n 0.14575595 Peri. 68.82371 +0.38014971 -0.92492485
a 3.5758985 Node 358.83301 +0.83960754 +0.34530170
e 0.4476846 Incl. 1.35240 +0.38800177 +0.15899927
P 6.76
From 130 observations 1998 Dec. 15-1999 Feb. 16.
P/1998 X1 (ODAS)
T 1998 July 20.85716 TT Nakano
q 1.9752955 (2000.0) P Q
n 0.14594537 Peri. 68.83402 +0.38017029 -0.92491638
a 3.5728038 Node 358.82142 +0.83959774 +0.34532171
e 0.4471302 Incl. 1.35261 +0.38800281 +0.15900503
P 6.75
From 100 observations 1998 Dec. 15-1999 Jan. 26.
◎C/1998 X1の軌道と予報位置です
この彗星もまた，予想されたとおり，短周期彗星の１つでした．
C/1998 X1 (ODAS)
T 1998 July 20.74958 TT Nakano
q 1.9759603 (2000.0) P Q
n 0.14627159 Peri. 68.85253 +0.38017320 -0.92491518
a 3.5674897 Node 358.80272 +0.83959263 +0.34532627
e 0.4461203 Incl. 1.35303 +0.38801103 +0.15900213
P 6.74
From 97 observations 1998 Dec. 15-1999 Jan. 21.
Date/ TT R.A.(2000) Decl. Delta r Daily motion Mag. Moon Age
h h m ｡ , , / PA ｡ m1 ｡
1999 Jan. 25 14 09 47.18 +14 55.7 1.510 2.462 12.3 / 288 18.3 99 .59
26 14 09 46.38 +14 59.5 1.510 2.466 12.5 / 288 18.3 84 .70
27 14 09 45.56 +15 03.3 1.510 2.471 12.6 / 288 18.3 70 .80
28 14 09 44.73 +15 07.2 1.511 2.475 12.8 / 288 18.3 55 .88
29 14 09 43.89 +15 11.0 1.512 2.479 12.9 / 288 18.3 41 .95
30 14 09 43.04 +15 14.9 1.513 2.483 13.0 / 287 18.3 27 .99
31 14 09 42.18 +15 18.8 1.515 2.488 13.1 / 287 18.4 13 1.00
Feb. 1 14 09 41.31 +15 22.7 1.516 2.492 13.2 / 287 18.4 2 .99
2 14 09 40.44 +15 26.6 1.518 2.496 13.3 / 287 18.4 14 .96
3 14 09 39.56 +15 30.5 1.521 2.501 13.3 / 287 18.4 28 .91
4 14 09 38.68 +15 34.4 1.523 2.505 13.4 / 287 18.4 40 .84
5 14 09 37.79 +15 38.2 1.526 2.509 13.4 / 287 18.4 53 .76
6 14 09 36.90 +15 42.1 1.529 2.513 13.4 / 287 18.4 65 .68
7 14 09 36.02 +15 45.9 1.532 2.518 13.3 / 286 18.4 77 .59
8 14 09 35.13 +15 49.7 1.536 2.522 13.3 / 286 18.4 89 .49
9 14 09 34.25 +15 53.4 1.540 2.526 13.2 / 286 18.5 101 .40
10 14 09 33.37 +15 57.1 1.544 2.531 13.1 / 286 18.5 113 .31
11 14 09 32.49 +16 00.8 1.549 2.535 13.0 / 286 18.5 126 .22
12 14 09 31.62 +16 04.3 1.554 2.540 12.9 / 286 18.5 138 .15
13 14 09 30.76 +16 07.9 1.559 2.544 12.8 / 286 18.5 151 .08
14 14 09 29.90 +16 11.3 1.564 2.548 12.6 / 286 18.5 164 .03
15 14 09 29.06 +16 14.7 1.570 2.553 12.5 / 285 18.5 178 .01
16 14 09 28.22 +16 18.0 1.575 2.557 12.3 / 285 18.6 168 .00
17 14 09 27.40 +16 21.3 1.582 2.561 12.1 / 285 18.6 154 .02
18 14 09 26.59 +16 24.4 1.588 2.566 11.9 / 285 18.6 139 .07
19 14 09 25.79 +16 27.5 1.595 2.570 11.6 / 285 18.6 125 .14
20 14 09 25.01 +16 30.5 1.602 2.575 11.4 / 285 18.6 111 .22
21 14 09 24.24 +16 33.3 1.609 2.579 11.1 / 285 18.6 96 .33
22 14 09 23.49 +16 36.1 1.617 2.583 10.9 / 284 18.7 82 .44
23 14 09 22.75 +16 38.8 1.624 2.588 10.6 / 284 18.7 67 .55
24 14 09 22.04 +16 41.4 1.632 2.592 10.3 / 284 18.7 53 .66
25 14 09 21.34 +16 43.9 1.641 2.597 10.0 / 284 18.7 39 .76
26 14 09 20.67 +16 46.3 1.649 2.601 9.7 / 284 18.7 25 .85
27 14 09 20.01 +16 48.5 1.658 2.605 9.4 / 283 18.8 12 .92
28 14 09 19.37 +16 50.7 1.667 2.610 9.1 / 283 18.8 2 .97
Mar. 1 14 09 18.76 +16 52.8 1.677 2.614 8.7 / 283 18.8 15 .99
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C/1998 X1 (ODAS)
T 1998 July 18.59629 TT Nakano
q 1.9853743 (2000.0) P Q
n 0.15370276 Peri. 68.98946 +0.38292000 -0.92378130
a 3.4515561 Node 358.49544 +0.83850634 +0.34785498
e 0.4247886 Incl. 1.35847 +0.38765886 +0.16007820
P 6.41
From 70 observations 1998 Dec. 15-27.
戻ります。