103P/Hartley 2
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 103P/Hartley 2 |
| Type | P |
| Perihelion (tp_cal, UTC) | 2017-04-20T10:59:29.739840Z |
| Orbit solution date (soln_date, UTC) | 2025-05-01T10:45:38Z |
| Obs used | 8768 |
| NEO | Yes |
| M1 | 16.000 |
| K1 | 4.500 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2015-05-10.0000000 |
| e | 0.69359786 |
| q (au) | 1.064947 |
| a (au) | 3.475652 |
| i (deg) | 13.599468 |
| Ω (om, deg) | 219.742174 |
| ω (w, deg) | 181.321844 |
| M (ma, deg) | 251.782173 |
等級
散乱 + 全体線形
$$ M_a = (15.166 + 3.231\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 15.166 |
| n | 3.231 |
| gf | 1.000 |
| gb | -0.819 |
| k | 0.959 |
| 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 |
|---|---|---|---|
| 2023-04-17 | 2025-04-28 | +5.4961 | -1.916 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 14:19:09.01 | -16:59:59.8 | HIP 70031 | 14.33 |
| 2026-02-03 12:00 | 14:19:11.57 | -17:00:10.3 | HIP 70031 | 14.07 |
| 2026-02-04 00:00 | 14:19:13.95 | -17:00:19.9 | HIP 70031 | 13.85 |
| 2026-02-04 12:00 | 14:19:16.14 | -17:00:28.5 | HIP 70031 | 13.67 |
| 2026-02-05 00:00 | 14:19:18.15 | -17:00:36.2 | HIP 70031 | 13.51 |
| 2026-02-05 12:00 | 14:19:19.97 | -17:00:42.9 | HIP 70031 | 13.38 |
| 2026-02-06 00:00 | 14:19:21.61 | -17:00:48.7 | HIP 70031 | 13.27 |
| 2026-02-06 12:00 | 14:19:23.06 | -17:00:53.6 | HIP 70031 | 13.18 |
| 2026-02-07 00:00 | 14:19:24.32 | -17:00:57.4 | HIP 70031 | 13.11 |
| 2026-02-07 12:00 | 14:19:25.40 | -17:01:00.3 | HIP 70031 | 13.04 |
| 2026-02-08 00:00 | 14:19:26.29 | -17:01:02.3 | HIP 70031 | 12.98 |
| 2026-02-08 12:00 | 14:19:26.99 | -17:01:03.3 | HIP 70031 | 12.93 |
| 2026-02-09 00:00 | 14:19:27.51 | -17:01:03.3 | HIP 70031 | 12.88 |
| 2026-02-09 12:00 | 14:19:27.83 | -17:01:02.3 | HIP 70031 | 12.84 |
| 2026-02-10 00:00 | 14:19:27.96 | -17:01:00.3 | HIP 70031 | 12.79 |
| 2026-02-10 12:00 | 14:19:27.91 | -17:00:57.4 | HIP 70031 | 12.75 |
| 2026-02-11 00:00 | 14:19:27.66 | -17:00:53.5 | HIP 70031 | 12.72 |
| 2026-02-11 12:00 | 14:19:27.22 | -17:00:48.5 | HIP 70031 | 12.68 |
| 2026-02-12 00:00 | 14:19:26.60 | -17:00:42.6 | HIP 70031 | 12.65 |
| 2026-02-12 12:00 | 14:19:25.78 | -17:00:35.7 | HIP 70031 | 12.63 |
| 2026-02-13 00:00 | 14:19:24.76 | -17:00:27.8 | HIP 70031 | 12.61 |
| 2026-02-13 12:00 | 14:19:23.56 | -17:00:18.9 | HIP 70031 | 12.61 |
| 2026-02-14 00:00 | 14:19:22.16 | -17:00:08.9 | HIP 70031 | 12.63 |
| 2026-02-14 12:00 | 14:19:20.57 | -16:59:58.0 | HIP 70031 | 12.66 |
| 2026-02-15 00:00 | 14:19:18.79 | -16:59:46.0 | HIP 70031 | 12.73 |
| 2026-02-15 12:00 | 14:19:16.82 | -16:59:33.0 | HIP 70031 | 12.82 |
| 2026-02-16 00:00 | 14:19:14.65 | -16:59:19.0 | HIP 70031 | 12.94 |
| 2026-02-16 12:00 | 14:19:12.29 | -16:59:04.0 | HIP 70031 | 13.11 |
| 2026-02-17 00:00 | 14:19:09.73 | -16:58:47.9 | HIP 70031 | 13.32 |
| 2026-02-17 12:00 | 14:19:06.98 | -16:58:30.8 | HIP 70031 | 13.59 |
| 2026-02-18 00:00 | 14:19:04.04 | -16:58:12.7 | HIP 70031 | 13.91 |
| 2026-02-18 12:00 | 14:19:00.90 | -16:57:53.5 | HIP 70031 | 14.29 |
| 2026-02-19 00:00 | 14:18:57.57 | -16:57:33.4 | HIP 70031 | 14.73 |
| 2026-02-19 12:00 | 14:18:54.05 | -16:57:12.1 | HIP 70031 | 15.25 |
| 2026-02-20 00:00 | 14:18:50.33 | -16:56:49.9 | HIP 70031 | 15.82 |
| 2026-02-20 12:00 | 14:18:46.42 | -16:56:26.6 | HIP 70031 | 16.47 |
| 2026-02-21 00:00 | 14:18:42.32 | -16:56:02.2 | HIP 70031 | 17.19 |
| 2026-02-21 12:00 | 14:18:38.02 | -16:55:36.9 | HIP 70031 | 17.98 |
| 2026-02-22 00:00 | 14:18:33.53 | -16:55:10.4 | HIP 70031 | 18.85 |
| 2026-02-22 12:00 | 14:18:28.85 | -16:54:43.0 | HIP 70031 | 19.78 |
| 2026-02-23 00:00 | 14:18:23.98 | -16:54:14.4 | HIP 70031 | 20.78 |
| 2026-02-23 12:00 | 14:18:18.92 | -16:53:44.9 | HIP 70031 | 21.85 |
| 2026-02-24 00:00 | 14:18:13.66 | -16:53:14.3 | HIP 70031 | 22.98 |