池谷・張彗星（C/2002 C1）の軌道要素（提供：村岡健治氏） （上のものほど新しい） --------------------------------------------------------------- C/2002 C1 (Ikeya-Zhang) Epoch 2002 June 15.0 TT = JDT 2452440.5 T 2002 Mar. 18.98287 TT Muraoka q 0.5070841 (2000.0) P Q n 0.00265359 Peri. 34.67150 -0.54919236 -0.69064081 a 51.6709695 Node 93.37010 +0.61953866 -0.71434535 e 0.9901863 Incl. 28.12196 +0.56085613 +0.11280951 P 371.42 >From 805 observations 2002 Feb. 1-May 12, mean residual 0".66. Nongravitational parameters A1 = +3.27 +/- 0.34, A2 = +1.4399 +/- 0.2295. H1 = 7.0 K1 = 9.0 --------------------------------------------------------------- Comet C/2002 C1 ( Ikeya-Zhang ) The following improved orbital elements by Kenji Muraoka, are from 713 observations 2002 Feb. 1 to Apr. 29, including 8 Planets, Moon and 3 minor planets perturbations and non-gravitational effect of style II. The mean residual is +/- 0.65 arc seconds. Epoch = 2002 Mar. 27.0 TT JDT = 2452360.5 T = 2002 Mar. 18.97939 +/- 0.00019 (m.e.) TT Peri. = 34.66534 +/- 0.00198 Node = 93.37024 +/- 0.00056 (2000.0) Incl. = 28.12166 +/- 0.00016 q = 0.5070594 +/- 0.0000132 AU e = 0.9899595 +/- 0.0000374 1/a = +0.0198015 +/- 0.0000738 1/AU A1 = +2.84 +/- 0.38 A2 = +1.0685 +/- 0.2633 ( P = 359 years ) C/2002 C1 (Ikeya-Zhang) Epoch 2002 May 6.0 TT = JDT 2452400.5 T 2002 Mar. 18.98114 TT Muraoka M 0.5070556 (2000.0) P Q n 0.00267679 Peri. 34.66753 -0.54913647 -0.69068643 a 51.3720055 Node 93.36948 +0.61959410 -0.71429488 e 0.9901297 Incl. 28.12183 +0.56084961 +0.11284984 P 368.2 --------------------------------------------------------------- C/2002 C1 ( Ikeya-Zhang ) Epoch 2002 May 6.0 TT = JDT 2452400.5 T 2002 Mar. 18.98101 TT Muraoka M 0.5070534 (2000.0) P Q n 0.00267871 Peri. 34.66687 -0.54913129 -0.69069140 a 51.3474250 Node 93.36965 +0.61960102 -0.71428932 e 0.9901250 Incl. 28.12175 +0.56084704 +0.11285453 P 367.94 >From 632 observations 2002 Feb. 1-Apr. 13, mean residual 0".65. Nongravitational parameters A1 = +2.93 +/- 0.42, A2 = +1.0158 +/- 0.3411. H1 = 7.0 K1 = 10.0 ------------------------------------------------------------------------ Comet C/2002 C1 ( Ikeya-Zhang ) The following improved orbital elements by Kenji Muraoka, are from 602 observations 2002 Feb. 1 to Apr. 5 including 8 Planets, Moon and 3 minor planets perturbations and non- gravitational effect of style II. The mean residual is +/- 0.63 arc seconds. Epoch = 2002 Mar. 27.0 TT JDT = 2452360.5 T = 2002 Mar. 18.97926 +/- 0.00079 (m.e.) TT Peri. = 34.66513 +/- 0.00359 Node = 93.37042 +/- 0.00103 (2000.0) Incl. = 28.12140 +/- 0.00032 q = 0.5070596 +/- 0.0000199 AU e = 0.9899472 +/- 0.0000543 1/a = +0.0198257 +/- 0.0001071 1/AU A1 = +2.61 +/- 0.54 A2 = +0.5281 +/- 0.5041 ( P = 358 years ) ---------------------------------------------------------------- Comet C/2002 C1 ( Ikeya-Zhang ) The following improved orbital elements by Kenji Muraoka, are from 470 observations 2002 Feb. 1 to Mar. 21, perturbations by 9 Planets, Moon and 5 minor planets were taken into account. The mean residual is +/- 0.67 arc seconds. Epoch = 2002 Mar. 27.0 TT JDT = 2452360.5 T = 2002 Mar. 18.98073 +/- 0.00011 (m.e.) TT Peri. = 34.67199 +/- 0.00036 Node = 93.36759 +/- 0.00036 (2000.0) Incl. = 28.12158 +/- 0.00011 q = 0.5070609 +/- 0.0000005 AU e = 0.9900561 +/- 0.0000064 1/a = +0.0196108 +/- 0.0000127 1/AU ( P = 364.13 years ) ---------------------------------------------------------------- Comet C/2002 C1 ( Ikeya-Zhang ) The following improved orbital elements by Kenji Muraoka, are from 461 observations 2002 Feb. 1 to Mar. 16, perturbations by 9 Planets, Moon and 5 minor planets were taken into account. The mean residual is +/- 0.66 arc seconds. Epoch = 2002 Mar. 27.0 TT JDT = 2452360.5 T = 2002 Mar. 18.98033 +/- 0.00015 (m.e.) TT Peri. = 34.67077 +/- 0.00045 Node = 93.36809 +/- 0.00045 (2000.0) Incl. = 28.12138 +/- 0.00014 q = 0.5070626 +/- 0.0000007 AU e = 0.9900770 +/- 0.0000079 1/a = +0.0195695 +/- 0.0000155 1/AU ( P = 365.28 years ) ---------------------------------------------------------------------- Comet C/2002 C1 ( Ikeya-Zhang ) The following improved orbital elements by Kenji Muraoka, are from 370 observations 2002 Feb. 1 to Mar. 9, perturbations by 8 Planets, Moon and 3 minor planets were taken into account. The mean residual is +/- 0.65 arc seconds. Epoch = 2002 Mar. 27.0 TT JDT = 2452360.5 T = 2002 Mar. 18.979856 +/- 0.000284 (m.e.) TT Peri. = 34.669673 +/- 0.000780 Node = 93.369785 +/- 0.000805 (2000.0) Incl. = 28.121040 +/- 0.000276 q = 0.50705968 +/- 0.00000179 AU e = 0.99007070 +/- 0.00001308 1/a = +0.01958212 +/- 0.00002580 1/AU ( P = 364.93 years ) ---------------------------------------------------------------------- Comet C/2002 C1 ( Ikeya-Zhang ) The following improved orbital elements by Kenji Muraoka are from 314 observations 2002 Feb. 1 to Mar. 3, perturbations by 9 Planets, Moon and 5 minor planets were taken into account. The mean residual is +/- 0.64 arc seconds. Epoch = 2002 Mar. 27.0 TT JDT = 2452360.5 T = 2002 Mar. 18.97960 +/- 0.00064 (m.e.) TT Peri. = 34.66944 +/- 0.00156 Node = 93.37042 +/- 0.00169 (2000.0) Incl. = 28.12094 +/- 0.00064 q = 0.5070571 +/- 0.0000051 AU e = 0.9900679 +/- 0.0000260 1/a = +0.0195876 +/- 0.0000512 1/AU ( P = 364.78 years ) ---------------------------------------------------------------------- Comet C/2002 C1 ( Ikeya-Zhang ) = C/1661 C1 The following improved orbital elements by Kenji Muraoka, are from 325 observations 1661 to 2002, perturbations by 8 Plantes and Ceres were taken into account. The mean residual is +/- 1.28 arc seconds. Epoch = 2002 Mar. 27.0 TT JDT = 2452360.5 T = 2002 Mar. 18.99691 +/- 0.00074 (m.e.) TT Peri. = 34.69394 +/- 0.00292 Node = 93.33212 +/- 0.00322 (2000.0) Incl. = 28.12774 +/- 0.00062 q = 0.5071640 +/- 0.0000001 AU e = 0.9900779 +/- 0.0000000 a = 51.1148172 +/- 0.0000002 AU n゜= 0.00269702 +/- 0.00000000 P = 365.443 +/- 0.0000018 years T = 1661 Jan. 28.91823 TT Epoch = 1661 Feb. 2.0 TT Peri. = 35.09102 e = 0.9902791 Node = 93.36968 (2000.0) a = 52.7773334 AU Incl. = 28.07592 n゜= 0.002570591 q = 0.5130407 AU P = 383.417 years