C/1969 Y1 (Bennett)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/1969 Y1 (Bennett) |
| Type | C |
| Perihelion (tp_cal, UTC) | 1970-03-20T01:05:24.547200Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:29:19Z |
| Obs used | 529 |
| NEO | - |
| M1 | 4.600 |
| K1 | 12.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 1970-04-12.0000000 |
| e | 0.99629328 |
| q (au) | 0.537620 |
| a (au) | 145.039330 |
| i (deg) | 90.039811 |
| Ω (om, deg) | 224.657683 |
| ω (w, deg) | 354.149089 |
| M (ma, deg) | 0.012952 |
等級
散乱 + 全体線形
$$ M_a = (4.085 + 3.365\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 4.085 |
| n | 3.365 |
| gf | 0.800 |
| gb | -0.500 |
| k | 1.000 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 1969-12-28 | 1970-03-20 | +3.0975 | +0.766 |
| 1970-03-20 | 1970-04-13 | -4.8648 | -1.069 |
| 1970-04-13 | 1970-05-01 | +0.0535 | -0.380 |
| 1970-05-01 | 1970-11-20 | +1.8732 | -0.612 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 02:31:51.04 | +29:33:18.1 | HIP 11823 | 17.19 |
| 2026-06-01 12:00 | 02:31:52.46 | +29:33:26.5 | HIP 11823 | 17.15 |
| 2026-06-02 00:00 | 02:31:53.89 | +29:33:34.9 | HIP 11823 | 17.12 |
| 2026-06-02 12:00 | 02:31:55.30 | +29:33:43.4 | HIP 11823 | 17.09 |
| 2026-06-03 00:00 | 02:31:56.71 | +29:33:51.9 | HIP 11823 | 17.07 |
| 2026-06-03 12:00 | 02:31:58.11 | +29:34:00.4 | HIP 11823 | 17.06 |
| 2026-06-04 00:00 | 02:31:59.50 | +29:34:08.8 | HIP 11823 | 17.06 |
| 2026-06-04 12:00 | 02:32:00.89 | +29:34:17.3 | HIP 11823 | 17.06 |
| 2026-06-05 00:00 | 02:32:02.27 | +29:34:25.9 | HIP 11823 | 17.07 |
| 2026-06-05 12:00 | 02:32:03.64 | +29:34:34.4 | HIP 11823 | 17.09 |
| 2026-06-06 00:00 | 02:32:05.00 | +29:34:42.9 | HIP 11823 | 17.12 |
| 2026-06-06 12:00 | 02:32:06.36 | +29:34:51.4 | HIP 11823 | 17.15 |
| 2026-06-07 00:00 | 02:32:07.71 | +29:35:00.0 | HIP 11823 | 17.19 |
| 2026-06-07 12:00 | 02:32:09.05 | +29:35:08.5 | HIP 11823 | 17.23 |
| 2026-06-08 00:00 | 02:32:10.38 | +29:35:17.1 | HIP 11823 | 17.29 |
| 2026-06-08 12:00 | 02:32:11.71 | +29:35:25.6 | HIP 11823 | 17.35 |
| 2026-06-09 00:00 | 02:32:13.02 | +29:35:34.2 | HIP 11823 | 17.41 |
| 2026-06-09 12:00 | 02:32:14.33 | +29:35:42.7 | HIP 11823 | 17.48 |
| 2026-06-10 00:00 | 02:32:15.63 | +29:35:51.3 | HIP 11823 | 17.56 |
| 2026-06-10 12:00 | 02:32:16.92 | +29:35:59.9 | HIP 11823 | 17.64 |
| 2026-06-11 00:00 | 02:32:18.21 | +29:36:08.4 | HIP 11823 | 17.73 |
| 2026-06-11 12:00 | 02:32:19.48 | +29:36:17.0 | HIP 11823 | 17.82 |
| 2026-06-12 00:00 | 02:32:20.75 | +29:36:25.6 | HIP 11823 | 17.92 |
| 2026-06-12 12:00 | 02:32:22.01 | +29:36:34.1 | HIP 11823 | 18.03 |
| 2026-06-13 00:00 | 02:32:23.25 | +29:36:42.7 | HIP 11823 | 18.14 |
| 2026-06-13 12:00 | 02:32:24.49 | +29:36:51.3 | HIP 11823 | 18.25 |
| 2026-06-14 00:00 | 02:32:25.72 | +29:36:59.8 | HIP 11823 | 18.37 |
| 2026-06-14 12:00 | 02:32:26.95 | +29:37:08.4 | HIP 11823 | 18.49 |
| 2026-06-15 00:00 | 02:32:28.16 | +29:37:17.0 | HIP 11823 | 18.62 |
| 2026-06-15 12:00 | 02:32:29.36 | +29:37:25.5 | HIP 11823 | 18.75 |
| 2026-06-16 00:00 | 02:32:30.56 | +29:37:34.1 | HIP 11823 | 18.88 |
| 2026-06-16 12:00 | 02:32:31.74 | +29:37:42.6 | HIP 11823 | 19.02 |
| 2026-06-17 00:00 | 02:32:32.91 | +29:37:51.2 | HIP 11823 | 19.16 |
| 2026-06-17 12:00 | 02:32:34.08 | +29:37:59.7 | HIP 11823 | 19.31 |
| 2026-06-18 00:00 | 02:32:35.23 | +29:38:08.2 | HIP 11823 | 19.45 |
| 2026-06-18 12:00 | 02:32:36.38 | +29:38:16.7 | HIP 11823 | 19.60 |
| 2026-06-19 00:00 | 02:32:37.51 | +29:38:25.2 | HIP 11823 | 19.76 |
| 2026-06-19 12:00 | 02:32:38.64 | +29:38:33.7 | HIP 11823 | 19.91 |
| 2026-06-20 00:00 | 02:32:39.75 | +29:38:42.2 | HIP 11823 | 20.07 |
| 2026-06-20 12:00 | 02:32:40.86 | +29:38:50.7 | HIP 11869 | 19.93 |
| 2026-06-21 00:00 | 02:32:41.95 | +29:38:59.2 | HIP 11869 | 19.72 |
| 2026-06-21 12:00 | 02:32:43.04 | +29:39:07.6 | HIP 11869 | 19.52 |
| 2026-06-22 00:00 | 02:32:44.11 | +29:39:16.1 | HIP 11869 | 19.32 |