156P/Russell-LINEAR
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 156P/Russell-LINEAR |
| Type | P |
| Perihelion (tp_cal, UTC) | 2020-11-17T19:50:25.532160Z |
| Orbit solution date (soln_date, UTC) | 2026-07-28T14:33:39Z |
| Obs used | 2333 |
| NEO | - |
| M1 | 12.700 |
| K1 | 9.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2020-03-21.0000000 |
| e | 0.61492244 |
| q (au) | 1.333114 |
| a (au) | 3.461937 |
| i (deg) | 17.263540 |
| Ω (om, deg) | 35.396898 |
| ω (w, deg) | 0.378461 |
| M (ma, deg) | 322.997635 |
等級
散乱 + 全体線形
$$ M_a = (11.922 + 3.065\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.922 |
| n | 3.065 |
| gf | 1.000 |
| gb | -0.500 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2020-01-20 | 2020-07-21 | -49.3673 | +17.357 |
| 2020-07-21 | 2020-09-16 | +3.1689 | +2.883 |
| 2020-09-16 | 2020-11-17 | +72.1414 | -9.382 |
| 2020-11-17 | 2021-03-31 | -0.7137 | -0.628 |
| 2021-03-31 | 2022-03-31 | +7.9952 | -3.473 |
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 | 17:34:29.39 | -44:52:14.2 | HIP 85967 | 8.80 |
| 2026-07-29 12:00 | 17:34:02.50 | -44:50:43.0 | HIP 85967 | 9.77 |
| 2026-07-30 00:00 | 17:33:36.08 | -44:49:10.0 | HIP 85967 | 12.77 |
| 2026-07-30 12:00 | 17:33:10.12 | -44:47:35.2 | HIP 85967 | 16.68 |
| 2026-07-31 00:00 | 17:32:44.64 | -44:45:58.5 | HIP 85886 | 16.49 |
| 2026-07-31 12:00 | 17:32:19.64 | -44:44:20.1 | HIP 85886 | 16.61 |
| 2026-08-01 00:00 | 17:31:55.12 | -44:42:39.9 | HIP 85886 | 17.94 |
| 2026-08-01 12:00 | 17:31:31.09 | -44:40:58.1 | HIP 85628 | 17.93 |
| 2026-08-02 00:00 | 17:31:07.55 | -44:39:14.7 | HIP 85628 | 14.39 |
| 2026-08-02 12:00 | 17:30:44.50 | -44:37:29.6 | HIP 85628 | 11.64 |
| 2026-08-03 00:00 | 17:30:21.95 | -44:35:43.0 | HIP 85628 | 10.25 |
| 2026-08-03 12:00 | 17:29:59.91 | -44:33:54.9 | HIP 85628 | 10.67 |
| 2026-08-04 00:00 | 17:29:38.36 | -44:32:05.4 | HIP 85544 | 8.11 |
| 2026-08-04 12:00 | 17:29:17.33 | -44:30:14.4 | HIP 85544 | 6.43 |
| 2026-08-05 00:00 | 17:28:56.80 | -44:28:22.0 | HIP 85544 | 7.22 |
| 2026-08-05 12:00 | 17:28:36.79 | -44:26:28.3 | HIP 85544 | 9.82 |
| 2026-08-06 00:00 | 17:28:17.30 | -44:24:33.3 | HIP 85544 | 13.13 |
| 2026-08-06 12:00 | 17:27:58.32 | -44:22:37.1 | HIP 85544 | 16.70 |
| 2026-08-07 00:00 | 17:27:39.87 | -44:20:39.6 | HIP 85544 | 20.33 |
| 2026-08-07 12:00 | 17:27:21.95 | -44:18:41.0 | HIP 85357 | 21.06 |
| 2026-08-08 00:00 | 17:27:04.55 | -44:16:41.2 | HIP 85357 | 21.86 |
| 2026-08-08 12:00 | 17:26:47.68 | -44:14:40.4 | HIP 85357 | 23.26 |
| 2026-08-09 00:00 | 17:26:31.34 | -44:12:38.5 | HIP 85162 | 24.95 |
| 2026-08-09 12:00 | 17:26:15.54 | -44:10:35.5 | HIP 85162 | 21.97 |
| 2026-08-10 00:00 | 17:26:00.28 | -44:08:31.7 | HIP 85162 | 19.27 |
| 2026-08-10 12:00 | 17:25:45.55 | -44:06:26.8 | HIP 85162 | 16.92 |
| 2026-08-11 00:00 | 17:25:31.37 | -44:04:21.1 | HIP 85168 | 13.94 |
| 2026-08-11 12:00 | 17:25:17.73 | -44:02:14.6 | HIP 85168 | 10.98 |
| 2026-08-12 00:00 | 17:25:04.63 | -44:00:07.2 | HIP 85168 | 8.33 |
| 2026-08-12 12:00 | 17:24:52.07 | -43:57:59.0 | HIP 85168 | 6.29 |
| 2026-08-13 00:00 | 17:24:40.06 | -43:55:50.1 | HIP 85168 | 5.46 |
| 2026-08-13 12:00 | 17:24:28.60 | -43:53:40.5 | HIP 85159 | 6.24 |
| 2026-08-14 00:00 | 17:24:17.68 | -43:51:30.3 | HIP 85159 | 3.42 |
| 2026-08-14 12:00 | 17:24:07.31 | -43:49:19.4 | HIP 85159 | 1.23 |
| 2026-08-15 00:00 | 17:23:57.50 | -43:47:07.9 | HIP 85159 | 2.72 |
| 2026-08-15 12:00 | 17:23:48.22 | -43:44:55.9 | HIP 85159 | 5.33 |
| 2026-08-16 00:00 | 17:23:39.50 | -43:42:43.3 | HIP 85159 | 7.98 |
| 2026-08-16 12:00 | 17:23:31.33 | -43:40:30.3 | HIP 85159 | 10.60 |
| 2026-08-17 00:00 | 17:23:23.70 | -43:38:16.7 | HIP 85159 | 13.18 |
| 2026-08-17 12:00 | 17:23:16.62 | -43:36:02.8 | HIP 85159 | 15.72 |
| 2026-08-18 00:00 | 17:23:10.09 | -43:33:48.5 | HIP 85159 | 18.21 |
| 2026-08-18 12:00 | 17:23:04.10 | -43:31:33.8 | HIP 85156 | 18.84 |
| 2026-08-19 00:00 | 17:22:58.66 | -43:29:18.8 | HIP 85156 | 17.75 |