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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 17:44:27.25 | -10:21:30.8 | HIP 86832 | 2.26 |
| 2026-07-29 12:00 | 17:44:23.86 | -10:21:39.4 | HIP 86832 | 3.04 |
| 2026-07-30 00:00 | 17:44:20.49 | -10:21:48.2 | HIP 86832 | 3.85 |
| 2026-07-30 12:00 | 17:44:17.15 | -10:21:57.0 | HIP 86832 | 4.66 |
| 2026-07-31 00:00 | 17:44:13.84 | -10:22:06.0 | HIP 86832 | 5.47 |
| 2026-07-31 12:00 | 17:44:10.55 | -10:22:15.0 | HIP 86832 | 6.29 |
| 2026-08-01 00:00 | 17:44:07.28 | -10:22:24.1 | HIP 86832 | 7.09 |
| 2026-08-01 12:00 | 17:44:04.04 | -10:22:33.3 | HIP 86832 | 7.90 |
| 2026-08-02 00:00 | 17:44:00.83 | -10:22:42.6 | HIP 86832 | 8.70 |
| 2026-08-02 12:00 | 17:43:57.64 | -10:22:52.0 | HIP 86832 | 9.50 |
| 2026-08-03 00:00 | 17:43:54.48 | -10:23:01.5 | HIP 86832 | 10.29 |
| 2026-08-03 12:00 | 17:43:51.35 | -10:23:11.0 | HIP 86832 | 11.07 |
| 2026-08-04 00:00 | 17:43:48.24 | -10:23:20.7 | HIP 86832 | 11.85 |
| 2026-08-04 12:00 | 17:43:45.16 | -10:23:30.4 | HIP 86832 | 12.62 |
| 2026-08-05 00:00 | 17:43:42.10 | -10:23:40.2 | HIP 86832 | 13.39 |
| 2026-08-05 12:00 | 17:43:39.08 | -10:23:50.1 | HIP 86832 | 14.15 |
| 2026-08-06 00:00 | 17:43:36.08 | -10:24:00.1 | HIP 86832 | 14.91 |
| 2026-08-06 12:00 | 17:43:33.11 | -10:24:10.2 | HIP 86832 | 15.66 |
| 2026-08-07 00:00 | 17:43:30.16 | -10:24:20.4 | HIP 86832 | 16.40 |
| 2026-08-07 12:00 | 17:43:27.25 | -10:24:30.6 | HIP 86832 | 17.14 |
| 2026-08-08 00:00 | 17:43:24.36 | -10:24:41.0 | HIP 86832 | 17.87 |
| 2026-08-08 12:00 | 17:43:21.50 | -10:24:51.4 | HIP 86832 | 18.59 |
| 2026-08-09 00:00 | 17:43:18.67 | -10:25:01.9 | HIP 86832 | 19.31 |
| 2026-08-09 12:00 | 17:43:15.87 | -10:25:12.4 | HIP 86832 | 20.02 |
| 2026-08-10 00:00 | 17:43:13.10 | -10:25:23.1 | HIP 86832 | 20.73 |
| 2026-08-10 12:00 | 17:43:10.35 | -10:25:33.8 | HIP 86832 | 21.42 |
| 2026-08-11 00:00 | 17:43:07.64 | -10:25:44.6 | HIP 86832 | 22.11 |
| 2026-08-11 12:00 | 17:43:04.96 | -10:25:55.5 | HIP 86702 | 21.90 |
| 2026-08-12 00:00 | 17:43:02.31 | -10:26:06.5 | HIP 86702 | 21.65 |
| 2026-08-12 12:00 | 17:42:59.68 | -10:26:17.5 | HIP 86702 | 21.43 |
| 2026-08-13 00:00 | 17:42:57.09 | -10:26:28.6 | HIP 86702 | 21.22 |
| 2026-08-13 12:00 | 17:42:54.53 | -10:26:39.8 | HIP 86702 | 21.02 |
| 2026-08-14 00:00 | 17:42:52.00 | -10:26:51.1 | HIP 86702 | 20.85 |
| 2026-08-14 12:00 | 17:42:49.50 | -10:27:02.4 | HIP 86702 | 20.69 |
| 2026-08-15 00:00 | 17:42:47.03 | -10:27:13.8 | HIP 86702 | 20.55 |
| 2026-08-15 12:00 | 17:42:44.59 | -10:27:25.3 | HIP 86702 | 20.42 |
| 2026-08-16 00:00 | 17:42:42.18 | -10:27:36.8 | HIP 86702 | 20.31 |
| 2026-08-16 12:00 | 17:42:39.81 | -10:27:48.5 | HIP 86702 | 20.22 |
| 2026-08-17 00:00 | 17:42:37.46 | -10:28:00.1 | HIP 86702 | 20.14 |
| 2026-08-17 12:00 | 17:42:35.15 | -10:28:11.9 | HIP 86702 | 20.08 |
| 2026-08-18 00:00 | 17:42:32.87 | -10:28:23.7 | HIP 86702 | 20.03 |
| 2026-08-18 12:00 | 17:42:30.62 | -10:28:35.6 | HIP 86702 | 20.00 |
| 2026-08-19 00:00 | 17:42:28.41 | -10:28:47.5 | HIP 86702 | 19.98 |