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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 18:32:39.33 | -27:43:51.2 | HIP 90739 | 26.86 |
| 2026-03-26 12:00 | 18:32:47.39 | -27:43:50.8 | HIP 91075 | 26.34 |
| 2026-03-27 00:00 | 18:32:55.26 | -27:43:50.5 | HIP 91075 | 24.73 |
| 2026-03-27 12:00 | 18:33:02.95 | -27:43:50.4 | HIP 91075 | 23.17 |
| 2026-03-28 00:00 | 18:33:10.45 | -27:43:50.4 | HIP 91075 | 21.68 |
| 2026-03-28 12:00 | 18:33:17.76 | -27:43:50.6 | HIP 91075 | 20.26 |
| 2026-03-29 00:00 | 18:33:24.89 | -27:43:50.8 | HIP 91075 | 18.90 |
| 2026-03-29 12:00 | 18:33:31.82 | -27:43:51.3 | HIP 91075 | 17.61 |
| 2026-03-30 00:00 | 18:33:38.57 | -27:43:51.8 | HIP 91075 | 16.40 |
| 2026-03-30 12:00 | 18:33:45.13 | -27:43:52.5 | HIP 91075 | 15.27 |
| 2026-03-31 00:00 | 18:33:51.49 | -27:43:53.4 | HIP 91075 | 14.24 |
| 2026-03-31 12:00 | 18:33:57.66 | -27:43:54.4 | HIP 91075 | 13.31 |
| 2026-04-01 00:00 | 18:34:03.64 | -27:43:55.5 | HIP 91075 | 12.48 |
| 2026-04-01 12:00 | 18:34:09.43 | -27:43:56.7 | HIP 91075 | 11.77 |
| 2026-04-02 00:00 | 18:34:15.02 | -27:43:58.1 | HIP 91075 | 11.18 |
| 2026-04-02 12:00 | 18:34:20.42 | -27:43:59.7 | HIP 91075 | 10.72 |
| 2026-04-03 00:00 | 18:34:25.62 | -27:44:01.4 | HIP 91075 | 10.40 |
| 2026-04-03 12:00 | 18:34:30.62 | -27:44:03.2 | HIP 91075 | 10.20 |
| 2026-04-04 00:00 | 18:34:35.43 | -27:44:05.2 | HIP 91075 | 10.13 |
| 2026-04-04 12:00 | 18:34:40.04 | -27:44:07.3 | HIP 91075 | 10.16 |
| 2026-04-05 00:00 | 18:34:44.45 | -27:44:09.5 | HIP 91075 | 10.30 |
| 2026-04-05 12:00 | 18:34:48.67 | -27:44:11.9 | HIP 91075 | 10.51 |
| 2026-04-06 00:00 | 18:34:52.68 | -27:44:14.5 | HIP 91075 | 10.80 |
| 2026-04-06 12:00 | 18:34:56.49 | -27:44:17.1 | HIP 91075 | 11.13 |
| 2026-04-07 00:00 | 18:35:00.10 | -27:44:19.9 | HIP 91075 | 11.49 |
| 2026-04-07 12:00 | 18:35:03.50 | -27:44:22.9 | HIP 91075 | 11.88 |
| 2026-04-08 00:00 | 18:35:06.71 | -27:44:26.0 | HIP 91075 | 12.28 |
| 2026-04-08 12:00 | 18:35:09.71 | -27:44:29.2 | HIP 91075 | 12.69 |
| 2026-04-09 00:00 | 18:35:12.50 | -27:44:32.6 | HIP 91075 | 13.09 |
| 2026-04-09 12:00 | 18:35:15.09 | -27:44:36.1 | HIP 91075 | 13.48 |
| 2026-04-10 00:00 | 18:35:17.48 | -27:44:39.7 | HIP 91075 | 13.86 |
| 2026-04-10 12:00 | 18:35:19.65 | -27:44:43.5 | HIP 91075 | 14.22 |
| 2026-04-11 00:00 | 18:35:21.62 | -27:44:47.4 | HIP 91075 | 14.56 |
| 2026-04-11 12:00 | 18:35:23.38 | -27:44:51.5 | HIP 91075 | 14.87 |
| 2026-04-12 00:00 | 18:35:24.94 | -27:44:55.6 | HIP 91075 | 15.16 |
| 2026-04-12 12:00 | 18:35:26.28 | -27:45:00.0 | HIP 91075 | 15.41 |
| 2026-04-13 00:00 | 18:35:27.42 | -27:45:04.4 | HIP 91075 | 15.64 |
| 2026-04-13 12:00 | 18:35:28.34 | -27:45:09.0 | HIP 91075 | 15.84 |
| 2026-04-14 00:00 | 18:35:29.05 | -27:45:13.7 | HIP 91075 | 16.01 |
| 2026-04-14 12:00 | 18:35:29.55 | -27:45:18.5 | HIP 91075 | 16.14 |
| 2026-04-15 00:00 | 18:35:29.84 | -27:45:23.4 | HIP 91075 | 16.25 |
| 2026-04-15 12:00 | 18:35:29.92 | -27:45:28.5 | HIP 91075 | 16.32 |
| 2026-04-16 00:00 | 18:35:29.78 | -27:45:33.7 | HIP 91075 | 16.36 |