C/1963 A1 (Ikeya)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1963 A1 (Ikeya) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1963-03-21T11:23:55.291200Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:16Z |
| Obs used | 33 |
| NEO | - |
| M1 | - |
| K1 | - |
| PC | 0.030 |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1963-04-26.0000000 |
| e | 0.99338425 |
| q (au) | 0.632140 |
| a (au) | 95.550699 |
| i (deg) | 160.648837 |
| Ω (om, deg) | 53.219499 |
| ω (w, deg) | 336.302578 |
| M (ma, deg) | 0.037488 |
等級
散乱 + 全体線形
$$ M_a = (6.550 + 5.309\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 6.550 |
| n | 5.309 |
| gf | 0.800 |
| gb | -1.000 |
| k | 0.883 |
| δ90 | 5.499 |
| 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 |
|---|---|---|---|
| 1963-01-14 | 1963-03-21 | +1.7201 | +0.327 |
| 1963-03-21 | 1963-10-12 | -1.6935 | +2.278 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 17:35:43.03 | -13:20:41.5 | HIP 86049 | 19.58 |
| 2026-03-26 12:00 | 17:35:42.74 | -13:20:37.6 | HIP 86049 | 19.61 |
| 2026-03-27 00:00 | 17:35:42.44 | -13:20:33.7 | HIP 86049 | 19.64 |
| 2026-03-27 12:00 | 17:35:42.13 | -13:20:29.8 | HIP 86049 | 19.67 |
| 2026-03-28 00:00 | 17:35:41.80 | -13:20:25.9 | HIP 86049 | 19.69 |
| 2026-03-28 12:00 | 17:35:41.46 | -13:20:22.0 | HIP 86049 | 19.71 |
| 2026-03-29 00:00 | 17:35:41.11 | -13:20:18.1 | HIP 86049 | 19.74 |
| 2026-03-29 12:00 | 17:35:40.75 | -13:20:14.2 | HIP 86049 | 19.76 |
| 2026-03-30 00:00 | 17:35:40.37 | -13:20:10.3 | HIP 86049 | 19.78 |
| 2026-03-30 12:00 | 17:35:39.98 | -13:20:06.4 | HIP 86049 | 19.80 |
| 2026-03-31 00:00 | 17:35:39.58 | -13:20:02.5 | HIP 86049 | 19.83 |
| 2026-03-31 12:00 | 17:35:39.17 | -13:19:58.6 | HIP 86049 | 19.85 |
| 2026-04-01 00:00 | 17:35:38.74 | -13:19:54.7 | HIP 86049 | 19.87 |
| 2026-04-01 12:00 | 17:35:38.30 | -13:19:50.8 | HIP 86049 | 19.89 |
| 2026-04-02 00:00 | 17:35:37.85 | -13:19:46.9 | HIP 86049 | 19.91 |
| 2026-04-02 12:00 | 17:35:37.38 | -13:19:43.0 | HIP 86049 | 19.92 |
| 2026-04-03 00:00 | 17:35:36.90 | -13:19:39.1 | HIP 86049 | 19.94 |
| 2026-04-03 12:00 | 17:35:36.41 | -13:19:35.2 | HIP 86049 | 19.96 |
| 2026-04-04 00:00 | 17:35:35.91 | -13:19:31.3 | HIP 86049 | 19.98 |
| 2026-04-04 12:00 | 17:35:35.40 | -13:19:27.4 | HIP 86049 | 20.00 |
| 2026-04-05 00:00 | 17:35:34.87 | -13:19:23.5 | HIP 86049 | 20.01 |
| 2026-04-05 12:00 | 17:35:34.33 | -13:19:19.7 | HIP 86049 | 20.03 |
| 2026-04-06 00:00 | 17:35:33.78 | -13:19:15.8 | HIP 86049 | 20.05 |
| 2026-04-06 12:00 | 17:35:33.21 | -13:19:11.9 | HIP 86049 | 20.07 |
| 2026-04-07 00:00 | 17:35:32.64 | -13:19:08.0 | HIP 86049 | 20.09 |
| 2026-04-07 12:00 | 17:35:32.05 | -13:19:04.2 | HIP 86049 | 20.11 |
| 2026-04-08 00:00 | 17:35:31.45 | -13:19:00.3 | HIP 86049 | 20.12 |
| 2026-04-08 12:00 | 17:35:30.83 | -13:18:56.4 | HIP 86049 | 20.14 |
| 2026-04-09 00:00 | 17:35:30.21 | -13:18:52.6 | HIP 86049 | 20.16 |
| 2026-04-09 12:00 | 17:35:29.57 | -13:18:48.7 | HIP 86049 | 20.18 |
| 2026-04-10 00:00 | 17:35:28.92 | -13:18:44.9 | HIP 86049 | 20.20 |
| 2026-04-10 12:00 | 17:35:28.26 | -13:18:41.1 | HIP 86049 | 20.22 |
| 2026-04-11 00:00 | 17:35:27.59 | -13:18:37.2 | HIP 86049 | 20.25 |
| 2026-04-11 12:00 | 17:35:26.90 | -13:18:33.4 | HIP 86049 | 20.27 |
| 2026-04-12 00:00 | 17:35:26.20 | -13:18:29.6 | HIP 86049 | 20.29 |
| 2026-04-12 12:00 | 17:35:25.49 | -13:18:25.8 | HIP 86049 | 20.32 |
| 2026-04-13 00:00 | 17:35:24.77 | -13:18:22.0 | HIP 86049 | 20.34 |
| 2026-04-13 12:00 | 17:35:24.04 | -13:18:18.2 | HIP 86049 | 20.37 |
| 2026-04-14 00:00 | 17:35:23.30 | -13:18:14.4 | HIP 86049 | 20.39 |
| 2026-04-14 12:00 | 17:35:22.54 | -13:18:10.6 | HIP 86049 | 20.42 |
| 2026-04-15 00:00 | 17:35:21.77 | -13:18:06.9 | HIP 86049 | 20.45 |
| 2026-04-15 12:00 | 17:35:20.99 | -13:18:03.1 | HIP 86049 | 20.48 |
| 2026-04-16 00:00 | 17:35:20.20 | -13:17:59.3 | HIP 86049 | 20.51 |