C/2002 X5 (Kudo-Fujikawa)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2002 X5 (Kudo-Fujikawa) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2003-01-29T00:03:18.599040Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:30:24Z |
| Obs used | 514 |
| NEO | - |
| M1 | 10.600 |
| K1 | 11.500 |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2003-01-20.0000000 |
| e | 0.99984090 |
| q (au) | 0.189934 |
| a (au) | 1193.800858 |
| i (deg) | 94.152279 |
| Ω (om, deg) | 119.065024 |
| ω (w, deg) | 187.584474 |
| M (ma, deg) | 359.999785 |
等級
散乱 + 全体線形
$$ M_a = (7.886 + 4.159\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 7.886 |
| n | 4.159 |
| gf | 1.000 |
| gb | -0.998 |
| k | 1.000 |
| δ90 | 10.000 |
| パラメータ | 記号 | 範囲 | 説明 |
|---|---|---|---|
| 太陽・地球距離が1 AUのときの絶対等級 | H0 | -5 to 20 | 彗星の固有の明るさ |
| 測光スロープパラメータ | n | 2 to 6 | 太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 | gf |
0.8 to 1 | 前方散乱の強さ |
| 後方散乱非対称係数 | gb |
-1 to -0.5 | 後方散乱の強さ |
| 分配係数 | k | 0.8 to 1 | 前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 | δ90 | 1 to 10 | ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) | 終了日 (UTC) | a | b |
|---|---|---|---|
| 2002-12-14 | 2002-12-23 | +17.1755 | -0.401 |
| 2002-12-23 | 2002-12-31 | -8.3536 | +0.041 |
| 2002-12-31 | 2003-01-19 | -3.8086 | -0.506 |
| 2003-02-07 | 2003-02-20 | -3.9273 | +0.459 |
| 2003-02-20 | 2003-02-27 | -12.3277 | -0.141 |
| 2003-02-27 | 2003-03-18 | -7.0995 | +0.825 |
| 2003-03-18 | 2003-03-31 | +6.6412 | -0.016 |
| 2003-03-31 | 2003-04-22 | +52.0092 | -8.310 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 08:00:01.21 | +20:51:08.5 | HIP 39064 | 6.41 |
| 2026-05-12 12:00 | 08:00:02.25 | +20:51:05.9 | HIP 39064 | 6.65 |
| 2026-05-13 00:00 | 08:00:03.30 | +20:51:03.3 | HIP 39064 | 6.90 |
| 2026-05-13 12:00 | 08:00:04.38 | +20:51:00.6 | HIP 39064 | 7.15 |
| 2026-05-14 00:00 | 08:00:05.48 | +20:50:57.8 | HIP 39064 | 7.40 |
| 2026-05-14 12:00 | 08:00:06.60 | +20:50:55.0 | HIP 39064 | 7.66 |
| 2026-05-15 00:00 | 08:00:07.74 | +20:50:52.1 | HIP 39064 | 7.93 |
| 2026-05-15 12:00 | 08:00:08.89 | +20:50:49.2 | HIP 39064 | 8.19 |
| 2026-05-16 00:00 | 08:00:10.07 | +20:50:46.2 | HIP 39064 | 8.47 |
| 2026-05-16 12:00 | 08:00:11.27 | +20:50:43.2 | HIP 39064 | 8.75 |
| 2026-05-17 00:00 | 08:00:12.49 | +20:50:40.1 | HIP 39064 | 9.03 |
| 2026-05-17 12:00 | 08:00:13.73 | +20:50:36.9 | HIP 39064 | 9.32 |
| 2026-05-18 00:00 | 08:00:14.98 | +20:50:33.7 | HIP 39064 | 9.62 |
| 2026-05-18 12:00 | 08:00:16.26 | +20:50:30.4 | HIP 39064 | 9.92 |
| 2026-05-19 00:00 | 08:00:17.55 | +20:50:27.1 | HIP 39064 | 10.22 |
| 2026-05-19 12:00 | 08:00:18.87 | +20:50:23.7 | HIP 39064 | 10.53 |
| 2026-05-20 00:00 | 08:00:20.20 | +20:50:20.3 | HIP 39064 | 10.84 |
| 2026-05-20 12:00 | 08:00:21.55 | +20:50:16.8 | HIP 39064 | 11.16 |
| 2026-05-21 00:00 | 08:00:22.93 | +20:50:13.3 | HIP 39064 | 11.48 |
| 2026-05-21 12:00 | 08:00:24.32 | +20:50:09.7 | HIP 39064 | 11.81 |
| 2026-05-22 00:00 | 08:00:25.72 | +20:50:06.0 | HIP 39064 | 12.14 |
| 2026-05-22 12:00 | 08:00:27.15 | +20:50:02.4 | HIP 39064 | 12.48 |
| 2026-05-23 00:00 | 08:00:28.60 | +20:49:58.6 | HIP 39064 | 12.82 |
| 2026-05-23 12:00 | 08:00:30.06 | +20:49:54.8 | HIP 39064 | 13.16 |
| 2026-05-24 00:00 | 08:00:31.54 | +20:49:50.9 | HIP 39064 | 13.51 |
| 2026-05-24 12:00 | 08:00:33.04 | +20:49:47.0 | HIP 39064 | 13.87 |
| 2026-05-25 00:00 | 08:00:34.56 | +20:49:43.1 | HIP 39064 | 14.23 |
| 2026-05-25 12:00 | 08:00:36.09 | +20:49:39.1 | HIP 39064 | 14.59 |
| 2026-05-26 00:00 | 08:00:37.64 | +20:49:35.0 | HIP 39064 | 14.95 |
| 2026-05-26 12:00 | 08:00:39.21 | +20:49:30.9 | HIP 39064 | 15.33 |
| 2026-05-27 00:00 | 08:00:40.80 | +20:49:26.8 | HIP 39064 | 15.70 |
| 2026-05-27 12:00 | 08:00:42.40 | +20:49:22.6 | HIP 39064 | 16.08 |
| 2026-05-28 00:00 | 08:00:44.02 | +20:49:18.3 | HIP 39064 | 16.46 |
| 2026-05-28 12:00 | 08:00:45.66 | +20:49:14.0 | HIP 39064 | 16.85 |
| 2026-05-29 00:00 | 08:00:47.31 | +20:49:09.7 | HIP 39064 | 17.24 |
| 2026-05-29 12:00 | 08:00:48.98 | +20:49:05.3 | HIP 39064 | 17.64 |
| 2026-05-30 00:00 | 08:00:50.67 | +20:49:00.8 | HIP 39064 | 18.04 |
| 2026-05-30 12:00 | 08:00:52.37 | +20:48:56.3 | HIP 39064 | 18.44 |
| 2026-05-31 00:00 | 08:00:54.09 | +20:48:51.8 | HIP 39064 | 18.85 |
| 2026-05-31 12:00 | 08:00:55.83 | +20:48:47.2 | HIP 39064 | 19.26 |
| 2026-06-01 00:00 | 08:00:57.58 | +20:48:42.6 | HIP 39064 | 19.67 |
| 2026-06-01 12:00 | 08:00:59.35 | +20:48:37.9 | HIP 39064 | 20.09 |
| 2026-06-02 00:00 | 08:01:01.13 | +20:48:33.2 | HIP 39064 | 20.52 |