C/2014 E2 (Jacques)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2014 E2 (Jacques) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2014-07-02T12:20:22.404480Z |
| Orbit solution date (soln_date, UTC) | 2021-04-15T23:32:50Z |
| Obs used | 4812 |
| NEO | - |
| M1 | 12.000 |
| K1 | 6.500 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2014-08-02.0000000 |
| e | 0.99903625 |
| q (au) | 0.663916 |
| a (au) | 688.887878 |
| i (deg) | 156.392754 |
| Ω (om, deg) | 56.391597 |
| ω (w, deg) | 344.037051 |
| M (ma, deg) | 0.001662 |
等級
散乱 + 全体線形
$$ M_a = (11.111 + 3.563\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.111 |
| n | 3.563 |
| gf | 1.000 |
| gb | -0.909 |
| k | 0.991 |
| δ90 | 9.677 |
| 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 |
|---|---|---|---|
| 2014-02-23 | 2014-04-03 | +6.1865 | -2.097 |
| 2014-04-03 | 2014-06-29 | +14.8621 | -3.609 |
| 2014-07-08 | 2014-08-30 | +9.4649 | -1.555 |
| 2014-08-30 | 2015-06-08 | -2.1676 | -0.724 |
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 | 17:58:32.39 | -10:39:21.5 | HIP 87829 | 41.67 |
| 2026-03-26 12:00 | 17:58:31.84 | -10:39:08.4 | HIP 87829 | 41.42 |
| 2026-03-27 00:00 | 17:58:31.25 | -10:38:55.3 | HIP 87829 | 41.17 |
| 2026-03-27 12:00 | 17:58:30.62 | -10:38:42.3 | HIP 87829 | 40.91 |
| 2026-03-28 00:00 | 17:58:29.96 | -10:38:29.2 | HIP 87829 | 40.64 |
| 2026-03-28 12:00 | 17:58:29.26 | -10:38:16.1 | HIP 87829 | 40.36 |
| 2026-03-29 00:00 | 17:58:28.52 | -10:38:03.1 | HIP 87829 | 40.08 |
| 2026-03-29 12:00 | 17:58:27.74 | -10:37:50.0 | HIP 87829 | 39.80 |
| 2026-03-30 00:00 | 17:58:26.93 | -10:37:37.0 | HIP 87829 | 39.50 |
| 2026-03-30 12:00 | 17:58:26.08 | -10:37:24.0 | HIP 87829 | 39.20 |
| 2026-03-31 00:00 | 17:58:25.20 | -10:37:11.0 | HIP 87829 | 38.90 |
| 2026-03-31 12:00 | 17:58:24.28 | -10:36:58.0 | HIP 87829 | 38.58 |
| 2026-04-01 00:00 | 17:58:23.32 | -10:36:45.0 | HIP 87829 | 38.27 |
| 2026-04-01 12:00 | 17:58:22.33 | -10:36:32.0 | HIP 87829 | 37.94 |
| 2026-04-02 00:00 | 17:58:21.29 | -10:36:19.1 | HIP 87829 | 37.61 |
| 2026-04-02 12:00 | 17:58:20.23 | -10:36:06.2 | HIP 87829 | 37.27 |
| 2026-04-03 00:00 | 17:58:19.12 | -10:35:53.3 | HIP 87829 | 36.92 |
| 2026-04-03 12:00 | 17:58:17.98 | -10:35:40.4 | HIP 87829 | 36.57 |
| 2026-04-04 00:00 | 17:58:16.81 | -10:35:27.5 | HIP 87829 | 36.21 |
| 2026-04-04 12:00 | 17:58:15.60 | -10:35:14.7 | HIP 87829 | 35.85 |
| 2026-04-05 00:00 | 17:58:14.35 | -10:35:01.9 | HIP 87829 | 35.48 |
| 2026-04-05 12:00 | 17:58:13.06 | -10:34:49.1 | HIP 87829 | 35.10 |
| 2026-04-06 00:00 | 17:58:11.74 | -10:34:36.3 | HIP 87829 | 34.71 |
| 2026-04-06 12:00 | 17:58:10.39 | -10:34:23.5 | HIP 87829 | 34.33 |
| 2026-04-07 00:00 | 17:58:08.99 | -10:34:10.8 | HIP 87829 | 33.93 |
| 2026-04-07 12:00 | 17:58:07.57 | -10:33:58.1 | HIP 87829 | 33.53 |
| 2026-04-08 00:00 | 17:58:06.10 | -10:33:45.5 | HIP 87829 | 33.12 |
| 2026-04-08 12:00 | 17:58:04.60 | -10:33:32.9 | HIP 87829 | 32.71 |
| 2026-04-09 00:00 | 17:58:03.07 | -10:33:20.3 | HIP 87829 | 32.29 |
| 2026-04-09 12:00 | 17:58:01.50 | -10:33:07.7 | HIP 87829 | 31.86 |
| 2026-04-10 00:00 | 17:57:59.89 | -10:32:55.2 | HIP 87829 | 31.43 |
| 2026-04-10 12:00 | 17:57:58.25 | -10:32:42.7 | HIP 87829 | 31.00 |
| 2026-04-11 00:00 | 17:57:56.58 | -10:32:30.2 | HIP 87829 | 30.55 |
| 2026-04-11 12:00 | 17:57:54.86 | -10:32:17.8 | HIP 87829 | 30.11 |
| 2026-04-12 00:00 | 17:57:53.12 | -10:32:05.4 | HIP 87829 | 29.66 |
| 2026-04-12 12:00 | 17:57:51.34 | -10:31:53.0 | HIP 87829 | 29.20 |
| 2026-04-13 00:00 | 17:57:49.52 | -10:31:40.7 | HIP 87829 | 28.74 |
| 2026-04-13 12:00 | 17:57:47.67 | -10:31:28.4 | HIP 87829 | 28.27 |
| 2026-04-14 00:00 | 17:57:45.78 | -10:31:16.2 | HIP 87829 | 27.80 |
| 2026-04-14 12:00 | 17:57:43.86 | -10:31:04.0 | HIP 87829 | 27.33 |
| 2026-04-15 00:00 | 17:57:41.91 | -10:30:51.8 | HIP 87829 | 26.85 |
| 2026-04-15 12:00 | 17:57:39.92 | -10:30:39.7 | HIP 87829 | 26.37 |
| 2026-04-16 00:00 | 17:57:37.90 | -10:30:27.7 | HIP 87829 | 25.88 |