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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 17:43:21.30 | -27:04:53.7 | HIP 86730 | 9.62 |
| 2026-07-29 12:00 | 17:43:07.47 | -27:04:10.4 | HIP 86730 | 10.76 |
| 2026-07-30 00:00 | 17:42:53.83 | -27:03:27.1 | HIP 86730 | 12.58 |
| 2026-07-30 12:00 | 17:42:40.37 | -27:02:43.6 | HIP 86633 | 14.31 |
| 2026-07-31 00:00 | 17:42:27.09 | -27:02:00.1 | HIP 86633 | 12.27 |
| 2026-07-31 12:00 | 17:42:14.01 | -27:01:16.5 | HIP 86633 | 10.72 |
| 2026-08-01 00:00 | 17:42:01.11 | -27:00:32.8 | HIP 86633 | 9.86 |
| 2026-08-01 12:00 | 17:41:48.40 | -26:59:49.1 | HIP 86633 | 9.83 |
| 2026-08-02 00:00 | 17:41:35.88 | -26:59:05.3 | HIP 86633 | 10.62 |
| 2026-08-02 12:00 | 17:41:23.56 | -26:58:21.4 | HIP 86633 | 12.03 |
| 2026-08-03 00:00 | 17:41:11.43 | -26:57:37.5 | HIP 86633 | 13.84 |
| 2026-08-03 12:00 | 17:40:59.49 | -26:56:53.6 | HIP 86633 | 15.91 |
| 2026-08-04 00:00 | 17:40:47.74 | -26:56:09.7 | HIP 86633 | 18.12 |
| 2026-08-04 12:00 | 17:40:36.20 | -26:55:25.7 | HIP 86385 | 20.13 |
| 2026-08-05 00:00 | 17:40:24.85 | -26:54:41.7 | HIP 86385 | 17.65 |
| 2026-08-05 12:00 | 17:40:13.70 | -26:53:57.7 | HIP 86385 | 15.27 |
| 2026-08-06 00:00 | 17:40:02.75 | -26:53:13.7 | HIP 86385 | 13.01 |
| 2026-08-06 12:00 | 17:39:52.00 | -26:52:29.7 | HIP 86385 | 10.93 |
| 2026-08-07 00:00 | 17:39:41.45 | -26:51:45.7 | HIP 86385 | 9.09 |
| 2026-08-07 12:00 | 17:39:31.11 | -26:51:01.7 | HIP 86385 | 7.66 |
| 2026-08-08 00:00 | 17:39:20.96 | -26:50:17.7 | HIP 86385 | 6.82 |
| 2026-08-08 12:00 | 17:39:11.03 | -26:49:33.8 | HIP 86385 | 6.77 |
| 2026-08-09 00:00 | 17:39:01.30 | -26:48:49.8 | HIP 86385 | 7.48 |
| 2026-08-09 12:00 | 17:38:51.77 | -26:48:06.0 | HIP 86385 | 8.74 |
| 2026-08-10 00:00 | 17:38:42.46 | -26:47:22.1 | HIP 86385 | 10.31 |
| 2026-08-10 12:00 | 17:38:33.35 | -26:46:38.3 | HIP 86385 | 12.05 |
| 2026-08-11 00:00 | 17:38:24.45 | -26:45:54.6 | HIP 86265 | 10.96 |
| 2026-08-11 12:00 | 17:38:15.76 | -26:45:10.9 | HIP 86265 | 9.25 |
| 2026-08-12 00:00 | 17:38:07.28 | -26:44:27.3 | HIP 86265 | 7.75 |
| 2026-08-12 12:00 | 17:37:59.02 | -26:43:43.7 | HIP 86265 | 6.58 |
| 2026-08-13 00:00 | 17:37:50.96 | -26:43:00.2 | HIP 86265 | 5.89 |
| 2026-08-13 12:00 | 17:37:43.12 | -26:42:16.8 | HIP 86265 | 5.81 |
| 2026-08-14 00:00 | 17:37:35.50 | -26:41:33.4 | HIP 86265 | 6.32 |
| 2026-08-14 12:00 | 17:37:28.08 | -26:40:50.2 | HIP 86265 | 7.27 |
| 2026-08-15 00:00 | 17:37:20.88 | -26:40:07.0 | HIP 86265 | 8.47 |
| 2026-08-15 12:00 | 17:37:13.90 | -26:39:23.9 | HIP 86265 | 9.83 |
| 2026-08-16 00:00 | 17:37:07.13 | -26:38:41.0 | HIP 86265 | 11.25 |
| 2026-08-16 12:00 | 17:37:00.57 | -26:37:58.1 | HIP 86265 | 12.70 |
| 2026-08-17 00:00 | 17:36:54.23 | -26:37:15.3 | HIP 86265 | 14.16 |
| 2026-08-17 12:00 | 17:36:48.11 | -26:36:32.7 | HIP 86265 | 15.60 |
| 2026-08-18 00:00 | 17:36:42.20 | -26:35:50.1 | HIP 86265 | 17.03 |
| 2026-08-18 12:00 | 17:36:36.51 | -26:35:07.7 | HIP 86265 | 18.44 |
| 2026-08-19 00:00 | 17:36:31.03 | -26:34:25.4 | HIP 86265 | 19.81 |