157P/Tritton
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 157P/Tritton |
| Type | P |
| Perihelion (tp_cal, UTC) | 2022-08-02T01:39:34.369920Z |
| Orbit solution date (soln_date, UTC) | 2024-02-22T12:32:46Z |
| Obs used | 434 |
| NEO | Yes |
| M1 | 15.200 |
| 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) | 2020-01-28.0000000 |
| e | 0.62745613 |
| q (au) | 1.254895 |
| a (au) | 3.368450 |
| i (deg) | 11.182660 |
| Ω (om, deg) | 289.427253 |
| ω (w, deg) | 157.441955 |
| M (ma, deg) | 213.795421 |
等級
散乱 + 全体線形
$$ M_a = (15.000 + 4.182\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 15.000 |
| n | 4.182 |
| gf | 1.000 |
| gb | -0.518 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2021-07-17 | 2022-07-28 | -0.9870 | -0.126 |
| 2022-08-02 | 2023-01-23 | +18.9647 | -3.987 |
| 2023-01-23 | 2023-04-13 | -1.8941 | +2.281 |
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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 17:37:59.37 | -25:55:11.1 | HIP 86307 | 27.09 |
| 2026-09-20 12:00 | 17:38:07.30 | -25:54:40.3 | HIP 86307 | 27.56 |
| 2026-09-21 00:00 | 17:38:15.41 | -25:54:09.7 | HIP 86307 | 28.15 |
| 2026-09-21 12:00 | 17:38:23.71 | -25:53:39.2 | HIP 86307 | 28.85 |
| 2026-09-22 00:00 | 17:38:32.19 | -25:53:08.9 | HIP 86307 | 29.66 |
| 2026-09-22 12:00 | 17:38:40.85 | -25:52:38.8 | HIP 86498 | 29.85 |
| 2026-09-23 00:00 | 17:38:49.70 | -25:52:08.9 | HIP 86498 | 27.88 |
| 2026-09-23 12:00 | 17:38:58.73 | -25:51:39.1 | HIP 86498 | 25.90 |
| 2026-09-24 00:00 | 17:39:07.94 | -25:51:09.5 | HIP 86498 | 23.91 |
| 2026-09-24 12:00 | 17:39:17.33 | -25:50:40.0 | HIP 86498 | 21.91 |
| 2026-09-25 00:00 | 17:39:26.89 | -25:50:10.7 | HIP 86498 | 19.92 |
| 2026-09-25 12:00 | 17:39:36.64 | -25:49:41.5 | HIP 86498 | 17.95 |
| 2026-09-26 00:00 | 17:39:46.56 | -25:49:12.5 | HIP 86498 | 16.03 |
| 2026-09-26 12:00 | 17:39:56.66 | -25:48:43.6 | HIP 86498 | 14.19 |
| 2026-09-27 00:00 | 17:40:06.93 | -25:48:14.9 | HIP 86498 | 12.50 |
| 2026-09-27 12:00 | 17:40:17.38 | -25:47:46.3 | HIP 86498 | 11.05 |
| 2026-09-28 00:00 | 17:40:28.00 | -25:47:17.9 | HIP 86498 | 9.96 |
| 2026-09-28 12:00 | 17:40:38.79 | -25:46:49.6 | HIP 86498 | 9.41 |
| 2026-09-29 00:00 | 17:40:49.76 | -25:46:21.5 | HIP 86498 | 9.50 |
| 2026-09-29 12:00 | 17:41:00.90 | -25:45:53.4 | HIP 86498 | 10.26 |
| 2026-09-30 00:00 | 17:41:12.20 | -25:45:25.6 | HIP 86498 | 11.57 |
| 2026-09-30 12:00 | 17:41:23.68 | -25:44:57.8 | HIP 86498 | 13.29 |
| 2026-10-01 00:00 | 17:41:35.32 | -25:44:30.2 | HIP 86583 | 13.87 |
| 2026-10-01 12:00 | 17:41:47.14 | -25:44:02.7 | HIP 86583 | 14.39 |
| 2026-10-02 00:00 | 17:41:59.12 | -25:43:35.3 | HIP 86583 | 15.39 |
| 2026-10-02 12:00 | 17:42:11.26 | -25:43:08.0 | HIP 86583 | 16.79 |
| 2026-10-03 00:00 | 17:42:23.57 | -25:42:40.9 | HIP 86583 | 18.51 |
| 2026-10-03 12:00 | 17:42:36.05 | -25:42:13.9 | HIP 86583 | 20.51 |
| 2026-10-04 00:00 | 17:42:48.69 | -25:41:46.9 | HIP 86583 | 22.70 |
| 2026-10-04 12:00 | 17:43:01.50 | -25:41:20.1 | HIP 86583 | 25.06 |
| 2026-10-05 00:00 | 17:43:14.46 | -25:40:53.4 | HIP 86583 | 27.56 |
| 2026-10-05 12:00 | 17:43:27.59 | -25:40:26.8 | HIP 86583 | 30.17 |
| 2026-10-06 00:00 | 17:43:40.88 | -25:40:00.3 | HIP 86719 | 31.49 |
| 2026-10-06 12:00 | 17:43:54.33 | -25:39:33.9 | HIP 86719 | 32.74 |
| 2026-10-07 00:00 | 17:44:07.94 | -25:39:07.6 | HIP 86719 | 34.24 |
| 2026-10-07 12:00 | 17:44:21.71 | -25:38:41.4 | HIP 87009 | 32.52 |
| 2026-10-08 00:00 | 17:44:35.63 | -25:38:15.2 | HIP 87009 | 29.56 |
| 2026-10-08 12:00 | 17:44:49.71 | -25:37:49.2 | HIP 87009 | 26.61 |
| 2026-10-09 00:00 | 17:45:03.95 | -25:37:23.2 | HIP 87009 | 23.69 |
| 2026-10-09 12:00 | 17:45:18.34 | -25:36:57.3 | HIP 87009 | 20.83 |
| 2026-10-10 00:00 | 17:45:32.88 | -25:36:31.5 | HIP 87009 | 18.08 |
| 2026-10-10 12:00 | 17:45:47.58 | -25:36:05.8 | HIP 87009 | 15.52 |
| 2026-10-11 00:00 | 17:46:02.43 | -25:35:40.1 | HIP 87009 | 13.28 |