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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 17:52:32.33 | -10:17:06.9 | HIP 87552 | 10.96 |
| 2026-06-01 12:00 | 17:52:28.07 | -10:17:02.5 | HIP 87552 | 11.93 |
| 2026-06-02 00:00 | 17:52:23.80 | -10:16:58.3 | HIP 87552 | 12.91 |
| 2026-06-02 12:00 | 17:52:19.52 | -10:16:54.2 | HIP 87552 | 13.90 |
| 2026-06-03 00:00 | 17:52:15.22 | -10:16:50.2 | HIP 87552 | 14.90 |
| 2026-06-03 12:00 | 17:52:10.92 | -10:16:46.3 | HIP 87552 | 15.91 |
| 2026-06-04 00:00 | 17:52:06.61 | -10:16:42.6 | HIP 87552 | 16.93 |
| 2026-06-04 12:00 | 17:52:02.29 | -10:16:38.9 | HIP 87552 | 17.96 |
| 2026-06-05 00:00 | 17:51:57.96 | -10:16:35.3 | HIP 87436 | 17.91 |
| 2026-06-05 12:00 | 17:51:53.62 | -10:16:31.9 | HIP 87436 | 17.93 |
| 2026-06-06 00:00 | 17:51:49.27 | -10:16:28.6 | HIP 87436 | 18.01 |
| 2026-06-06 12:00 | 17:51:44.92 | -10:16:25.4 | HIP 87436 | 18.16 |
| 2026-06-07 00:00 | 17:51:40.55 | -10:16:22.3 | HIP 87436 | 18.38 |
| 2026-06-07 12:00 | 17:51:36.18 | -10:16:19.3 | HIP 87436 | 18.65 |
| 2026-06-08 00:00 | 17:51:31.80 | -10:16:16.4 | HIP 87436 | 18.99 |
| 2026-06-08 12:00 | 17:51:27.42 | -10:16:13.6 | HIP 87436 | 19.38 |
| 2026-06-09 00:00 | 17:51:23.02 | -10:16:11.0 | HIP 87436 | 19.82 |
| 2026-06-09 12:00 | 17:51:18.63 | -10:16:08.5 | HIP 87436 | 20.32 |
| 2026-06-10 00:00 | 17:51:14.22 | -10:16:06.1 | HIP 87436 | 20.86 |
| 2026-06-10 12:00 | 17:51:09.81 | -10:16:03.8 | HIP 87436 | 21.45 |
| 2026-06-11 00:00 | 17:51:05.39 | -10:16:01.6 | HIP 87436 | 22.07 |
| 2026-06-11 12:00 | 17:51:00.97 | -10:15:59.5 | HIP 87256 | 22.31 |
| 2026-06-12 00:00 | 17:50:56.54 | -10:15:57.6 | HIP 87256 | 21.44 |
| 2026-06-12 12:00 | 17:50:52.11 | -10:15:55.8 | HIP 87256 | 20.58 |
| 2026-06-13 00:00 | 17:50:47.68 | -10:15:54.1 | HIP 87256 | 19.75 |
| 2026-06-13 12:00 | 17:50:43.24 | -10:15:52.5 | HIP 87256 | 18.94 |
| 2026-06-14 00:00 | 17:50:38.80 | -10:15:51.0 | HIP 87256 | 18.16 |
| 2026-06-14 12:00 | 17:50:34.36 | -10:15:49.6 | HIP 87256 | 17.40 |
| 2026-06-15 00:00 | 17:50:29.91 | -10:15:48.4 | HIP 87256 | 16.69 |
| 2026-06-15 12:00 | 17:50:25.46 | -10:15:47.3 | HIP 87256 | 16.01 |
| 2026-06-16 00:00 | 17:50:21.01 | -10:15:46.3 | HIP 87256 | 15.39 |
| 2026-06-16 12:00 | 17:50:16.56 | -10:15:45.4 | HIP 87256 | 14.81 |
| 2026-06-17 00:00 | 17:50:12.10 | -10:15:44.6 | HIP 87256 | 14.29 |
| 2026-06-17 12:00 | 17:50:07.65 | -10:15:44.0 | HIP 87256 | 13.84 |
| 2026-06-18 00:00 | 17:50:03.19 | -10:15:43.5 | HIP 87256 | 13.46 |
| 2026-06-18 12:00 | 17:49:58.74 | -10:15:43.1 | HIP 87256 | 13.16 |
| 2026-06-19 00:00 | 17:49:54.28 | -10:15:42.8 | HIP 87256 | 12.95 |
| 2026-06-19 12:00 | 17:49:49.83 | -10:15:42.6 | HIP 87256 | 12.82 |
| 2026-06-20 00:00 | 17:49:45.38 | -10:15:42.5 | HIP 87256 | 12.78 |
| 2026-06-20 12:00 | 17:49:40.93 | -10:15:42.6 | HIP 87256 | 12.84 |
| 2026-06-21 00:00 | 17:49:36.48 | -10:15:42.8 | HIP 87256 | 12.98 |
| 2026-06-21 12:00 | 17:49:32.03 | -10:15:43.1 | HIP 87177 | 13.12 |
| 2026-06-22 00:00 | 17:49:27.58 | -10:15:43.5 | HIP 87177 | 12.03 |