210P/Christensen
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 210P/Christensen |
| Type | P |
| Perihelion (tp_cal, UTC) | 2025-11-22T17:08:48.255360Z |
| Orbit solution date (soln_date, UTC) | 2026-05-06T14:49:39Z |
| Obs used | 238 |
| 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) | 2024-09-16.0000000 |
| e | 0.83404977 |
| q (au) | 0.524688 |
| a (au) | 3.161717 |
| i (deg) | 10.286489 |
| Ω (om, deg) | 93.798055 |
| ω (w, deg) | 345.932247 |
| M (ma, deg) | 284.138576 |
等級
散乱 + 全体線形
$$ M_a = (15.815 + 4.449\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 15.815 |
| n | 4.449 |
| gf | 0.800 |
| gb | -1.000 |
| k | 0.994 |
| 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 | +3.3959 | +0.722 |
| 2025-11-26 | 2026-05-09 | +0.4413 | -2.115 |
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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 14:10:44.56 | +01:23:09.5 | HIP 69340 | 11.76 |
| 2026-05-12 12:00 | 14:10:08.00 | +01:23:23.6 | HIP 69151 | 15.93 |
| 2026-05-13 00:00 | 14:09:31.94 | +01:23:34.5 | HIP 69151 | 11.40 |
| 2026-05-13 12:00 | 14:08:56.36 | +01:23:42.4 | HIP 69151 | 12.89 |
| 2026-05-14 00:00 | 14:08:21.27 | +01:23:47.2 | HIP 69151 | 18.86 |
| 2026-05-14 12:00 | 14:07:46.68 | +01:23:49.0 | HIP 68864 | 26.07 |
| 2026-05-15 00:00 | 14:07:12.58 | +01:23:47.8 | HIP 68864 | 18.02 |
| 2026-05-15 12:00 | 14:06:38.97 | +01:23:43.7 | HIP 68864 | 10.85 |
| 2026-05-16 00:00 | 14:06:05.87 | +01:23:36.6 | HIP 68864 | 7.24 |
| 2026-05-16 12:00 | 14:05:33.27 | +01:23:26.6 | HIP 68864 | 11.08 |
| 2026-05-17 00:00 | 14:05:01.16 | +01:23:13.6 | HIP 68864 | 17.96 |
| 2026-05-17 12:00 | 14:04:29.56 | +01:22:57.8 | HIP 68864 | 25.41 |
| 2026-05-18 00:00 | 14:03:58.47 | +01:22:39.2 | HIP 68864 | 32.96 |
| 2026-05-18 12:00 | 14:03:27.88 | +01:22:17.7 | HIP 68520 | 29.17 |
| 2026-05-19 00:00 | 14:02:57.79 | +01:21:53.4 | HIP 68520 | 22.50 |
| 2026-05-19 12:00 | 14:02:28.20 | +01:21:26.4 | HIP 68520 | 16.70 |
| 2026-05-20 00:00 | 14:01:59.13 | +01:20:56.6 | HIP 68520 | 12.79 |
| 2026-05-20 12:00 | 14:01:30.55 | +01:20:24.1 | HIP 68520 | 12.44 |
| 2026-05-21 00:00 | 14:01:02.49 | +01:19:49.0 | HIP 68450 | 10.15 |
| 2026-05-21 12:00 | 14:00:34.92 | +01:19:11.2 | HIP 68450 | 9.76 |
| 2026-05-22 00:00 | 14:00:07.86 | +01:18:30.7 | HIP 68450 | 13.40 |
| 2026-05-22 12:00 | 13:59:41.30 | +01:17:47.7 | HIP 68450 | 18.75 |
| 2026-05-23 00:00 | 13:59:15.24 | +01:17:02.2 | HIP 68299 | 19.88 |
| 2026-05-23 12:00 | 13:58:49.69 | +01:16:14.1 | HIP 68299 | 18.25 |
| 2026-05-24 00:00 | 13:58:24.63 | +01:15:23.6 | HIP 68299 | 18.73 |
| 2026-05-24 12:00 | 13:58:00.06 | +01:14:30.6 | HIP 68299 | 21.06 |
| 2026-05-25 00:00 | 13:57:35.99 | +01:13:35.2 | HIP 68092 | 20.03 |
| 2026-05-25 12:00 | 13:57:12.42 | +01:12:37.4 | HIP 68092 | 14.69 |
| 2026-05-26 00:00 | 13:56:49.34 | +01:11:37.2 | HIP 68092 | 10.12 |
| 2026-05-26 12:00 | 13:56:26.74 | +01:10:34.7 | HIP 68092 | 7.55 |
| 2026-05-27 00:00 | 13:56:04.64 | +01:09:30.0 | HIP 68092 | 8.70 |
| 2026-05-27 12:00 | 13:55:43.02 | +01:08:22.9 | HIP 68092 | 12.43 |
| 2026-05-28 00:00 | 13:55:21.88 | +01:07:13.7 | HIP 68092 | 17.03 |
| 2026-05-28 12:00 | 13:55:01.22 | +01:06:02.2 | HIP 68092 | 21.87 |
| 2026-05-29 00:00 | 13:54:41.04 | +01:04:48.5 | HIP 67828 | 18.12 |
| 2026-05-29 12:00 | 13:54:21.34 | +01:03:32.8 | HIP 67828 | 13.37 |
| 2026-05-30 00:00 | 13:54:02.11 | +01:02:14.9 | HIP 67828 | 9.03 |
| 2026-05-30 12:00 | 13:53:43.35 | +01:00:54.9 | HIP 67828 | 5.82 |
| 2026-05-31 00:00 | 13:53:25.06 | +00:59:32.9 | HIP 67828 | 5.70 |
| 2026-05-31 12:00 | 13:53:07.23 | +00:58:08.8 | HIP 67828 | 8.64 |
| 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 |