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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 02:26:58.90 | +29:23:09.9 | HIP 11486 | 22.99 |
| 2026-02-03 12:00 | 02:26:59.04 | +29:23:04.2 | HIP 11486 | 23.04 |
| 2026-02-04 00:00 | 02:26:59.20 | +29:22:58.5 | HIP 11486 | 23.08 |
| 2026-02-04 12:00 | 02:26:59.37 | +29:22:53.0 | HIP 11486 | 23.13 |
| 2026-02-05 00:00 | 02:26:59.55 | +29:22:47.4 | HIP 11486 | 23.17 |
| 2026-02-05 12:00 | 02:26:59.75 | +29:22:42.0 | HIP 11486 | 23.21 |
| 2026-02-06 00:00 | 02:26:59.97 | +29:22:36.6 | HIP 11486 | 23.25 |
| 2026-02-06 12:00 | 02:27:00.20 | +29:22:31.4 | HIP 11486 | 23.28 |
| 2026-02-07 00:00 | 02:27:00.44 | +29:22:26.1 | HIP 11486 | 23.31 |
| 2026-02-07 12:00 | 02:27:00.70 | +29:22:21.0 | HIP 11486 | 23.34 |
| 2026-02-08 00:00 | 02:27:00.98 | +29:22:15.9 | HIP 11486 | 23.37 |
| 2026-02-08 12:00 | 02:27:01.26 | +29:22:10.9 | HIP 11486 | 23.39 |
| 2026-02-09 00:00 | 02:27:01.57 | +29:22:05.9 | HIP 11486 | 23.41 |
| 2026-02-09 12:00 | 02:27:01.88 | +29:22:01.1 | HIP 11486 | 23.43 |
| 2026-02-10 00:00 | 02:27:02.22 | +29:21:56.3 | HIP 11486 | 23.45 |
| 2026-02-10 12:00 | 02:27:02.56 | +29:21:51.6 | HIP 11486 | 23.46 |
| 2026-02-11 00:00 | 02:27:02.92 | +29:21:46.9 | HIP 11486 | 23.48 |
| 2026-02-11 12:00 | 02:27:03.30 | +29:21:42.3 | HIP 11486 | 23.48 |
| 2026-02-12 00:00 | 02:27:03.69 | +29:21:37.8 | HIP 11486 | 23.49 |
| 2026-02-12 12:00 | 02:27:04.09 | +29:21:33.4 | HIP 11486 | 23.50 |
| 2026-02-13 00:00 | 02:27:04.51 | +29:21:29.1 | HIP 11486 | 23.50 |
| 2026-02-13 12:00 | 02:27:04.94 | +29:21:24.8 | HIP 11486 | 23.50 |
| 2026-02-14 00:00 | 02:27:05.38 | +29:21:20.6 | HIP 11486 | 23.50 |
| 2026-02-14 12:00 | 02:27:05.84 | +29:21:16.5 | HIP 11486 | 23.49 |
| 2026-02-15 00:00 | 02:27:06.32 | +29:21:12.4 | HIP 11486 | 23.49 |
| 2026-02-15 12:00 | 02:27:06.81 | +29:21:08.5 | HIP 11486 | 23.48 |
| 2026-02-16 00:00 | 02:27:07.31 | +29:21:04.6 | HIP 11486 | 23.47 |
| 2026-02-16 12:00 | 02:27:07.83 | +29:21:00.7 | HIP 11486 | 23.45 |
| 2026-02-17 00:00 | 02:27:08.36 | +29:20:57.0 | HIP 11486 | 23.44 |
| 2026-02-17 12:00 | 02:27:08.90 | +29:20:53.3 | HIP 11486 | 23.42 |
| 2026-02-18 00:00 | 02:27:09.46 | +29:20:49.8 | HIP 11486 | 23.40 |
| 2026-02-18 12:00 | 02:27:10.03 | +29:20:46.2 | HIP 11486 | 23.38 |
| 2026-02-19 00:00 | 02:27:10.61 | +29:20:42.8 | HIP 11486 | 23.36 |
| 2026-02-19 12:00 | 02:27:11.21 | +29:20:39.5 | HIP 11486 | 23.33 |
| 2026-02-20 00:00 | 02:27:11.82 | +29:20:36.2 | HIP 11486 | 23.30 |
| 2026-02-20 12:00 | 02:27:12.45 | +29:20:33.0 | HIP 11486 | 23.28 |
| 2026-02-21 00:00 | 02:27:13.09 | +29:20:29.9 | HIP 11486 | 23.25 |
| 2026-02-21 12:00 | 02:27:13.74 | +29:20:26.8 | HIP 11486 | 23.21 |
| 2026-02-22 00:00 | 02:27:14.41 | +29:20:23.9 | HIP 11486 | 23.18 |
| 2026-02-22 12:00 | 02:27:15.09 | +29:20:21.0 | HIP 11486 | 23.14 |
| 2026-02-23 00:00 | 02:27:15.78 | +29:20:18.2 | HIP 11486 | 23.11 |
| 2026-02-23 12:00 | 02:27:16.49 | +29:20:15.4 | HIP 11486 | 23.07 |
| 2026-02-24 00:00 | 02:27:17.21 | +29:20:12.8 | HIP 11486 | 23.03 |