64P/Swift-Gehrels
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 64P/Swift-Gehrels |
| Type | P |
| Perihelion (tp_cal, UTC) | 2018-11-03T21:53:15.495360Z |
| Orbit solution date (soln_date, UTC) | 2023-12-21T08:26:18Z |
| Obs used | 3436 |
| NEO | - |
| M1 | 14.500 |
| K1 | 6.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2017-12-09.0000000 |
| e | 0.68732017 |
| q (au) | 1.393350 |
| a (au) | 4.456157 |
| i (deg) | 8.948393 |
| Ω (om, deg) | 300.000979 |
| ω (w, deg) | 97.144197 |
| M (ma, deg) | 325.433022 |
等級
散乱 + 全体線形
$$ M_a = (12.980 + 2.682\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.980 |
| n | 2.682 |
| gf | 1.000 |
| gb | -0.500 |
| 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 |
|---|---|---|---|
| 2018-05-25 | 2018-08-18 | +18.4191 | -3.252 |
| 2018-08-18 | 2018-11-03 | +26.1368 | -4.376 |
| 2018-11-03 | 2019-05-06 | +1.5754 | -1.769 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
ファインディングチャート
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 16:40:27.13 | -30:24:42.3 | HIP 81552 | 14.66 |
| 2026-06-01 12:00 | 16:40:05.50 | -30:23:56.9 | HIP 81552 | 10.42 |
| 2026-06-02 00:00 | 16:39:43.85 | -30:23:10.8 | HIP 81552 | 6.85 |
| 2026-06-02 12:00 | 16:39:22.17 | -30:22:23.8 | HIP 81552 | 5.50 |
| 2026-06-03 00:00 | 16:39:00.48 | -30:21:36.1 | HIP 81552 | 7.65 |
| 2026-06-03 12:00 | 16:38:38.77 | -30:20:47.7 | HIP 81552 | 11.49 |
| 2026-06-04 00:00 | 16:38:17.05 | -30:19:58.5 | HIP 81552 | 15.85 |
| 2026-06-04 12:00 | 16:37:55.33 | -30:19:08.5 | HIP 81392 | 14.27 |
| 2026-06-05 00:00 | 16:37:33.60 | -30:18:17.8 | HIP 81392 | 11.72 |
| 2026-06-05 12:00 | 16:37:11.86 | -30:17:26.4 | HIP 81392 | 10.79 |
| 2026-06-06 00:00 | 16:36:50.13 | -30:16:34.3 | HIP 81392 | 11.86 |
| 2026-06-06 12:00 | 16:36:28.41 | -30:15:41.5 | HIP 81236 | 12.78 |
| 2026-06-07 00:00 | 16:36:06.69 | -30:14:47.9 | HIP 81236 | 8.19 |
| 2026-06-07 12:00 | 16:35:44.98 | -30:13:53.6 | HIP 81236 | 4.03 |
| 2026-06-08 00:00 | 16:35:23.29 | -30:12:58.7 | HIP 81236 | 3.34 |
| 2026-06-08 12:00 | 16:35:01.62 | -30:12:03.0 | HIP 81236 | 7.18 |
| 2026-06-09 00:00 | 16:34:39.97 | -30:11:06.7 | HIP 81236 | 11.73 |
| 2026-06-09 12:00 | 16:34:18.35 | -30:10:09.7 | HIP 81236 | 16.41 |
| 2026-06-10 00:00 | 16:33:56.75 | -30:09:12.0 | HIP 81009 | 17.53 |
| 2026-06-10 12:00 | 16:33:35.19 | -30:08:13.6 | HIP 81009 | 13.16 |
| 2026-06-11 00:00 | 16:33:13.66 | -30:07:14.7 | HIP 81009 | 9.20 |
| 2026-06-11 12:00 | 16:32:52.17 | -30:06:15.0 | HIP 81009 | 6.44 |
| 2026-06-12 00:00 | 16:32:30.72 | -30:05:14.7 | HIP 81009 | 6.60 |
| 2026-06-12 12:00 | 16:32:09.32 | -30:04:13.8 | HIP 81009 | 9.52 |
| 2026-06-13 00:00 | 16:31:47.96 | -30:03:12.3 | HIP 80896 | 8.65 |
| 2026-06-13 12:00 | 16:31:26.66 | -30:02:10.2 | HIP 80896 | 4.08 |
| 2026-06-14 00:00 | 16:31:05.42 | -30:01:07.5 | HIP 80896 | 1.75 |
| 2026-06-14 12:00 | 16:30:44.24 | -30:00:04.2 | HIP 80896 | 5.81 |
| 2026-06-15 00:00 | 16:30:23.11 | -29:59:00.3 | HIP 80896 | 10.42 |
| 2026-06-15 12:00 | 16:30:02.06 | -29:57:55.9 | HIP 80779 | 8.27 |
| 2026-06-16 00:00 | 16:29:41.07 | -29:56:50.9 | HIP 80779 | 7.68 |
| 2026-06-16 12:00 | 16:29:20.16 | -29:55:45.3 | HIP 80779 | 9.67 |
| 2026-06-17 00:00 | 16:28:59.33 | -29:54:39.3 | HIP 80779 | 13.08 |
| 2026-06-17 12:00 | 16:28:38.57 | -29:53:32.7 | HIP 80779 | 17.08 |
| 2026-06-18 00:00 | 16:28:17.90 | -29:52:25.6 | HIP 80779 | 21.32 |
| 2026-06-18 12:00 | 16:27:57.31 | -29:51:18.0 | HIP 80779 | 25.68 |
| 2026-06-19 00:00 | 16:27:36.82 | -29:50:09.9 | HIP 80490 | 23.98 |
| 2026-06-19 12:00 | 16:27:16.42 | -29:49:01.3 | HIP 80490 | 19.99 |
| 2026-06-20 00:00 | 16:26:56.11 | -29:47:52.3 | HIP 80490 | 16.33 |
| 2026-06-20 12:00 | 16:26:35.90 | -29:46:42.8 | HIP 80490 | 13.26 |
| 2026-06-21 00:00 | 16:26:15.79 | -29:45:32.9 | HIP 80490 | 11.24 |
| 2026-06-21 12:00 | 16:25:55.79 | -29:44:22.6 | HIP 80490 | 10.85 |
| 2026-06-22 00:00 | 16:25:35.89 | -29:43:11.8 | HIP 80399 | 12.23 |