210P/Christensen
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 210P/Christensen |
| Type | P |
| Perihelion (tp_cal, UTC) | 2025-11-22T16:57:28.010880Z |
| Orbit solution date (soln_date, UTC) | 2026-01-26T12:14:39Z |
| Obs used | 59 |
| NEO | Yes |
| M1 | 14.500 |
| K1 | 19.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-05-12.0000000 |
| e | 0.83400677 |
| q (au) | 0.524882 |
| a (au) | 3.162071 |
| i (deg) | 10.284995 |
| Ω (om, deg) | 93.797239 |
| ω (w, deg) | 345.925962 |
| M (ma, deg) | 261.891414 |
等級
散乱 + 全体線形
$$ M_a = (16.449 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 16.449 |
| n | 6.000 |
| gf | 0.800 |
| gb | -0.838 |
| k | 0.984 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2025-07-19 | 2025-08-18 | -6.3929 | +1.728 |
| 2025-08-18 | 2025-10-23 | -0.6829 | +0.180 |
| 2025-10-23 | 2025-11-02 | -2.5493 | -0.257 |
| 2025-11-26 | 2026-01-31 | -4.4086 | -2.888 |
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 | 15:46:26.25 | -07:59:29.5 | HIP 77097 | 28.66 |
| 2026-02-03 12:00 | 15:46:46.03 | -07:57:58.7 | HIP 77329 | 30.09 |
| 2026-02-04 00:00 | 15:47:05.25 | -07:56:25.8 | HIP 77461 | 27.18 |
| 2026-02-04 12:00 | 15:47:23.91 | -07:54:50.7 | HIP 77461 | 22.72 |
| 2026-02-05 00:00 | 15:47:42.02 | -07:53:13.5 | HIP 77461 | 18.63 |
| 2026-02-05 12:00 | 15:47:59.57 | -07:51:34.2 | HIP 77461 | 15.07 |
| 2026-02-06 00:00 | 15:48:16.56 | -07:49:52.7 | HIP 77461 | 12.41 |
| 2026-02-06 12:00 | 15:48:32.97 | -07:48:09.1 | HIP 77461 | 11.13 |
| 2026-02-07 00:00 | 15:48:48.82 | -07:46:23.3 | HIP 77461 | 11.59 |
| 2026-02-07 12:00 | 15:49:04.10 | -07:44:35.3 | HIP 77461 | 13.48 |
| 2026-02-08 00:00 | 15:49:18.79 | -07:42:45.1 | HIP 77461 | 16.24 |
| 2026-02-08 12:00 | 15:49:32.91 | -07:40:52.8 | HIP 77461 | 19.43 |
| 2026-02-09 00:00 | 15:49:46.45 | -07:38:58.4 | HIP 77461 | 22.82 |
| 2026-02-09 12:00 | 15:49:59.40 | -07:37:01.7 | HIP 77461 | 26.27 |
| 2026-02-10 00:00 | 15:50:11.76 | -07:35:02.9 | HIP 77461 | 29.73 |
| 2026-02-10 12:00 | 15:50:23.53 | -07:33:01.9 | HIP 77734 | 27.71 |
| 2026-02-11 00:00 | 15:50:34.71 | -07:30:58.7 | HIP 77734 | 24.80 |
| 2026-02-11 12:00 | 15:50:45.29 | -07:28:53.4 | HIP 77734 | 22.19 |
| 2026-02-12 00:00 | 15:50:55.27 | -07:26:45.9 | HIP 77734 | 19.96 |
| 2026-02-12 12:00 | 15:51:04.64 | -07:24:36.2 | HIP 77734 | 18.20 |
| 2026-02-13 00:00 | 15:51:13.41 | -07:22:24.3 | HIP 77734 | 17.01 |
| 2026-02-13 12:00 | 15:51:21.56 | -07:20:10.3 | HIP 77734 | 16.47 |
| 2026-02-14 00:00 | 15:51:29.11 | -07:17:54.1 | HIP 77734 | 16.60 |
| 2026-02-14 12:00 | 15:51:36.03 | -07:15:35.8 | HIP 77734 | 17.35 |
| 2026-02-15 00:00 | 15:51:42.34 | -07:13:15.3 | HIP 77734 | 18.62 |
| 2026-02-15 12:00 | 15:51:48.03 | -07:10:52.6 | HIP 77734 | 20.29 |
| 2026-02-16 00:00 | 15:51:53.09 | -07:08:27.8 | HIP 77734 | 22.25 |
| 2026-02-16 12:00 | 15:51:57.52 | -07:06:00.9 | HIP 77734 | 24.41 |
| 2026-02-17 00:00 | 15:52:01.33 | -07:03:31.8 | HIP 77734 | 26.73 |
| 2026-02-17 12:00 | 15:52:04.50 | -07:01:00.6 | HIP 77734 | 29.15 |
| 2026-02-18 00:00 | 15:52:07.03 | -06:58:27.3 | HIP 77734 | 31.66 |
| 2026-02-18 12:00 | 15:52:08.93 | -06:55:51.9 | HIP 77734 | 34.22 |
| 2026-02-19 00:00 | 15:52:10.19 | -06:53:14.4 | HIP 77568 | 36.21 |
| 2026-02-19 12:00 | 15:52:10.80 | -06:50:34.8 | HIP 77568 | 34.87 |
| 2026-02-20 00:00 | 15:52:10.78 | -06:47:53.1 | HIP 77568 | 33.53 |
| 2026-02-20 12:00 | 15:52:10.10 | -06:45:09.4 | HIP 77633 | 31.23 |
| 2026-02-21 00:00 | 15:52:08.78 | -06:42:23.6 | HIP 77633 | 28.82 |
| 2026-02-21 12:00 | 15:52:06.80 | -06:39:35.8 | HIP 77633 | 26.35 |
| 2026-02-22 00:00 | 15:52:04.18 | -06:36:46.0 | HIP 77633 | 23.82 |
| 2026-02-22 12:00 | 15:52:00.90 | -06:33:54.1 | HIP 77633 | 21.25 |
| 2026-02-23 00:00 | 15:51:56.96 | -06:31:00.3 | HIP 77633 | 18.65 |
| 2026-02-23 12:00 | 15:51:52.37 | -06:28:04.4 | HIP 77633 | 16.05 |
| 2026-02-24 00:00 | 15:51:47.12 | -06:25:06.6 | HIP 77633 | 13.51 |