164P/Christensen
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 164P/Christensen |
| Type | P |
| Perihelion (tp_cal, UTC) | 2018-05-31T11:31:05.088000Z |
| Orbit solution date (soln_date, UTC) | 2026-01-13T22:30:54Z |
| Obs used | 1438 |
| NEO | - |
| M1 | 14.200 |
| K1 | 5.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2016-07-09.0000000 |
| e | 0.53970320 |
| q (au) | 1.684335 |
| a (au) | 3.659238 |
| i (deg) | 16.256353 |
| Ω (om, deg) | 88.313239 |
| ω (w, deg) | 325.975975 |
| M (ma, deg) | 262.636152 |
等級
散乱 + 全体線形
$$ M_a = (11.584 + 3.837\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.584 |
| n | 3.837 |
| gf | 0.993 |
| gb | -0.500 |
| k | 1.000 |
| δ90 | 9.998 |
| 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 |
|---|---|---|---|
| 2024-06-29 | 2025-05-14 | -5.2329 | +1.882 |
| 2025-05-14 | 2026-01-23 | +35.7967 | -15.862 |
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 | 11:19:09.43 | +27:50:10.0 | HIP 55206 | 13.76 |
| 2026-02-03 12:00 | 11:18:49.02 | +27:55:06.1 | HIP 55206 | 7.57 |
| 2026-02-04 00:00 | 11:18:28.26 | +28:00:01.0 | HIP 55206 | 3.78 |
| 2026-02-04 12:00 | 11:18:07.16 | +28:04:54.7 | HIP 55206 | 7.84 |
| 2026-02-05 00:00 | 11:17:45.74 | +28:09:46.9 | HIP 55206 | 14.16 |
| 2026-02-05 12:00 | 11:17:23.99 | +28:14:37.7 | HIP 55206 | 20.79 |
| 2026-02-06 00:00 | 11:17:01.92 | +28:19:27.1 | HIP 55012 | 17.47 |
| 2026-02-06 12:00 | 11:16:39.54 | +28:24:14.8 | HIP 55012 | 11.30 |
| 2026-02-07 00:00 | 11:16:16.85 | +28:29:00.9 | HIP 55012 | 6.61 |
| 2026-02-07 12:00 | 11:15:53.86 | +28:33:45.2 | HIP 55012 | 7.38 |
| 2026-02-08 00:00 | 11:15:30.57 | +28:38:27.7 | HIP 55012 | 12.69 |
| 2026-02-08 12:00 | 11:15:06.99 | +28:43:08.4 | HIP 55012 | 19.08 |
| 2026-02-09 00:00 | 11:14:43.13 | +28:47:47.1 | HIP 54868 | 13.05 |
| 2026-02-09 12:00 | 11:14:19.00 | +28:52:23.8 | HIP 54868 | 6.17 |
| 2026-02-10 00:00 | 11:13:54.59 | +28:56:58.4 | HIP 54868 | 2.14 |
| 2026-02-10 12:00 | 11:13:29.93 | +29:01:30.9 | HIP 54868 | 8.40 |
| 2026-02-11 00:00 | 11:13:05.00 | +29:06:01.1 | HIP 54868 | 15.38 |
| 2026-02-11 12:00 | 11:12:39.83 | +29:10:29.0 | HIP 54778 | 21.98 |
| 2026-02-12 00:00 | 11:12:14.42 | +29:14:54.5 | HIP 54778 | 19.25 |
| 2026-02-12 12:00 | 11:11:48.78 | +29:19:17.7 | HIP 54778 | 18.98 |
| 2026-02-13 00:00 | 11:11:22.90 | +29:23:38.3 | HIP 54778 | 21.29 |
| 2026-02-13 12:00 | 11:10:56.82 | +29:27:56.3 | HIP 54778 | 25.50 |
| 2026-02-14 00:00 | 11:10:30.52 | +29:32:11.7 | HIP 54488 | 21.83 |
| 2026-02-14 12:00 | 11:10:04.01 | +29:36:24.4 | HIP 54488 | 17.33 |
| 2026-02-15 00:00 | 11:09:37.32 | +29:40:34.3 | HIP 54488 | 14.97 |
| 2026-02-15 12:00 | 11:09:10.43 | +29:44:41.4 | HIP 54488 | 15.77 |
| 2026-02-16 00:00 | 11:08:43.37 | +29:48:45.6 | HIP 54504 | 14.29 |
| 2026-02-16 12:00 | 11:08:16.14 | +29:52:46.9 | HIP 54504 | 13.94 |
| 2026-02-17 00:00 | 11:07:48.75 | +29:56:45.1 | HIP 54504 | 16.96 |
| 2026-02-17 12:00 | 11:07:21.20 | +30:00:40.3 | HIP 54240 | 19.82 |
| 2026-02-18 00:00 | 11:06:53.51 | +30:04:32.3 | HIP 54240 | 14.57 |
| 2026-02-18 12:00 | 11:06:25.69 | +30:08:21.1 | HIP 54240 | 11.49 |
| 2026-02-19 00:00 | 11:05:57.73 | +30:12:06.8 | HIP 54240 | 12.33 |
| 2026-02-19 12:00 | 11:05:29.66 | +30:15:49.1 | HIP 54240 | 16.49 |
| 2026-02-20 00:00 | 11:05:01.48 | +30:19:28.0 | HIP 54230 | 18.83 |
| 2026-02-20 12:00 | 11:04:33.20 | +30:23:03.6 | HIP 54230 | 20.06 |
| 2026-02-21 00:00 | 11:04:04.83 | +30:26:35.8 | HIP 54028 | 14.04 |
| 2026-02-21 12:00 | 11:03:36.38 | +30:30:04.4 | HIP 54028 | 7.20 |
| 2026-02-22 00:00 | 11:03:07.85 | +30:33:29.6 | HIP 54028 | 2.50 |
| 2026-02-22 12:00 | 11:02:39.26 | +30:36:51.2 | HIP 54028 | 7.71 |
| 2026-02-23 00:00 | 11:02:10.62 | +30:40:09.1 | HIP 53950 | 9.39 |
| 2026-02-23 12:00 | 11:01:41.92 | +30:43:23.4 | HIP 53950 | 9.75 |
| 2026-02-24 00:00 | 11:01:13.19 | +30:46:34.1 | HIP 53950 | 14.11 |