210P/Christensen
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 210P/Christensen |
| Type | P |
| Perihelion (tp_cal, UTC) | 2025-11-22T17:09:12.265920Z |
| Orbit solution date (soln_date, UTC) | 2026-05-29T11:29:15Z |
| Obs used | 250 |
| NEO | Yes |
| M1 | 14.300 |
| K1 | 14.750 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-09-24.0000000 |
| e | 0.83405167 |
| q (au) | 0.524678 |
| a (au) | 3.161695 |
| i (deg) | 10.286556 |
| Ω (om, deg) | 93.798057 |
| ω (w, deg) | 345.932617 |
| M (ma, deg) | 285.540273 |
等級
散乱 + 全体線形
$$ M_a = (15.262 + 2.954\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 15.262 |
| n | 2.954 |
| gf | 0.800 |
| gb | -0.500 |
| k | 1.000 |
| 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 | 2025-11-04 | +5.8982 | +1.198 |
| 2025-11-26 | 2026-05-09 | +1.5482 | -1.408 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 13:52:49.87 | +00:56:42.8 | HIP 67743 | 7.77 |
| 2026-06-01 12:00 | 13:52:32.96 | +00:55:14.7 | HIP 67743 | 5.90 |
| 2026-06-02 00:00 | 13:52:16.52 | +00:53:44.8 | HIP 67743 | 6.90 |
| 2026-06-02 12:00 | 13:52:00.53 | +00:52:12.9 | HIP 67743 | 9.82 |
| 2026-06-03 00:00 | 13:51:44.99 | +00:50:39.2 | HIP 67743 | 13.37 |
| 2026-06-03 12:00 | 13:51:29.89 | +00:49:03.6 | HIP 67607 | 16.35 |
| 2026-06-04 00:00 | 13:51:15.25 | +00:47:26.1 | HIP 67607 | 14.01 |
| 2026-06-04 12:00 | 13:51:01.05 | +00:45:46.9 | HIP 67607 | 12.48 |
| 2026-06-05 00:00 | 13:50:47.28 | +00:44:05.9 | HIP 67607 | 12.01 |
| 2026-06-05 12:00 | 13:50:33.96 | +00:42:23.1 | HIP 67607 | 12.64 |
| 2026-06-06 00:00 | 13:50:21.07 | +00:40:38.6 | HIP 67607 | 14.14 |
| 2026-06-06 12:00 | 13:50:08.61 | +00:38:52.3 | HIP 67607 | 16.23 |
| 2026-06-07 00:00 | 13:49:56.58 | +00:37:04.4 | HIP 67607 | 18.67 |
| 2026-06-07 12:00 | 13:49:44.97 | +00:35:14.9 | HIP 67607 | 21.30 |
| 2026-06-08 00:00 | 13:49:33.79 | +00:33:23.7 | HIP 67607 | 24.02 |
| 2026-06-08 12:00 | 13:49:23.03 | +00:31:30.9 | HIP 67319 | 22.29 |
| 2026-06-09 00:00 | 13:49:12.69 | +00:29:36.4 | HIP 67319 | 19.44 |
| 2026-06-09 12:00 | 13:49:02.76 | +00:27:40.5 | HIP 67319 | 16.83 |
| 2026-06-10 00:00 | 13:48:53.24 | +00:25:43.0 | HIP 67319 | 14.53 |
| 2026-06-10 12:00 | 13:48:44.12 | +00:23:43.9 | HIP 67319 | 12.68 |
| 2026-06-11 00:00 | 13:48:35.42 | +00:21:43.4 | HIP 67319 | 11.44 |
| 2026-06-11 12:00 | 13:48:27.12 | +00:19:41.4 | HIP 67319 | 10.98 |
| 2026-06-12 00:00 | 13:48:19.21 | +00:17:37.9 | HIP 67319 | 11.35 |
| 2026-06-12 12:00 | 13:48:11.71 | +00:15:32.9 | HIP 67319 | 12.44 |
| 2026-06-13 00:00 | 13:48:04.60 | +00:13:26.6 | HIP 67319 | 14.05 |
| 2026-06-13 12:00 | 13:47:57.88 | +00:11:18.9 | HIP 67319 | 16.00 |
| 2026-06-14 00:00 | 13:47:51.55 | +00:09:09.8 | HIP 67319 | 18.17 |
| 2026-06-14 12:00 | 13:47:45.60 | +00:06:59.3 | HIP 67319 | 20.46 |
| 2026-06-15 00:00 | 13:47:40.04 | +00:04:47.5 | HIP 67319 | 22.84 |
| 2026-06-15 12:00 | 13:47:34.86 | +00:02:34.4 | HIP 67319 | 25.26 |
| 2026-06-16 00:00 | 13:47:30.05 | +00:00:20.0 | HIP 67319 | 27.71 |
| 2026-06-16 12:00 | 13:47:25.62 | -00:01:55.7 | HIP 67319 | 30.17 |
| 2026-06-17 00:00 | 13:47:21.56 | -00:04:12.6 | HIP 67211 | 28.00 |
| 2026-06-17 12:00 | 13:47:17.87 | -00:06:30.8 | HIP 67211 | 25.58 |
| 2026-06-18 00:00 | 13:47:14.54 | -00:08:50.1 | HIP 67211 | 23.21 |
| 2026-06-18 12:00 | 13:47:11.57 | -00:11:10.6 | HIP 67211 | 20.90 |
| 2026-06-19 00:00 | 13:47:08.97 | -00:13:32.3 | HIP 67211 | 18.67 |
| 2026-06-19 12:00 | 13:47:06.71 | -00:15:55.1 | HIP 67211 | 16.56 |
| 2026-06-20 00:00 | 13:47:04.81 | -00:18:19.0 | HIP 67211 | 14.61 |
| 2026-06-20 12:00 | 13:47:03.25 | -00:20:44.1 | HIP 67211 | 12.90 |
| 2026-06-21 00:00 | 13:47:02.04 | -00:23:10.2 | HIP 67211 | 11.53 |
| 2026-06-21 12:00 | 13:47:01.17 | -00:25:37.3 | HIP 67211 | 10.64 |
| 2026-06-22 00:00 | 13:47:00.64 | -00:28:05.5 | HIP 67211 | 10.36 |