P/2024 T2 (Rankin)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | P/2024 T2 (Rankin) |
| Type | P |
| Perihelion (tp_cal, UTC) | 2024-12-08T08:20:48.166080Z |
| Orbit solution date (soln_date, UTC) | 2025-05-08T09:42:27Z |
| Obs used | 437 |
| NEO | - |
| M1 | 16.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2024-10-04T10:26:09.830400Z |
| Discovery magnitude (MPC) | 21.17 G |
| Discovery observatory (MPC) | G96 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-01-16.0000000 |
| e | 0.68065051 |
| q (au) | 1.972296 |
| a (au) | 6.175980 |
| i (deg) | 12.928498 |
| Ω (om, deg) | 113.060603 |
| ω (w, deg) | 343.832427 |
| M (ma, deg) | 2.482102 |
等級
散乱 + 全体線形
$$ M_a = (17.486 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 17.486 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.621 |
| k | 0.800 |
| 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 |
|---|---|---|---|
| 2024-12-09 | 2025-05-02 | -16.3623 | +5.017 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 14:35:58.01 | +01:34:20.5 | HIP 71255 | 25.59 |
| 2026-03-26 12:00 | 14:35:43.95 | +01:36:26.0 | HIP 71255 | 21.70 |
| 2026-03-27 00:00 | 14:35:29.74 | +01:38:31.4 | HIP 71255 | 17.86 |
| 2026-03-27 12:00 | 14:35:15.36 | +01:40:36.5 | HIP 71255 | 14.14 |
| 2026-03-28 00:00 | 14:35:00.83 | +01:42:41.4 | HIP 71255 | 10.69 |
| 2026-03-28 12:00 | 14:34:46.14 | +01:44:46.0 | HIP 71255 | 7.96 |
| 2026-03-29 00:00 | 14:34:31.30 | +01:46:50.3 | HIP 71255 | 6.90 |
| 2026-03-29 12:00 | 14:34:16.31 | +01:48:54.3 | HIP 71255 | 8.24 |
| 2026-03-30 00:00 | 14:34:01.17 | +01:50:57.9 | HIP 71255 | 11.18 |
| 2026-03-30 12:00 | 14:33:45.89 | +01:53:01.2 | HIP 71255 | 14.82 |
| 2026-03-31 00:00 | 14:33:30.46 | +01:55:04.2 | HIP 71255 | 18.78 |
| 2026-03-31 12:00 | 14:33:14.89 | +01:57:06.7 | HIP 71255 | 22.91 |
| 2026-04-01 00:00 | 14:32:59.19 | +01:59:08.8 | HIP 71041 | 20.76 |
| 2026-04-01 12:00 | 14:32:43.35 | +02:01:10.5 | HIP 71041 | 18.39 |
| 2026-04-02 00:00 | 14:32:27.39 | +02:03:11.8 | HIP 71041 | 16.84 |
| 2026-04-02 12:00 | 14:32:11.29 | +02:05:12.5 | HIP 71041 | 16.39 |
| 2026-04-03 00:00 | 14:31:55.07 | +02:07:12.8 | HIP 71041 | 17.13 |
| 2026-04-03 12:00 | 14:31:38.72 | +02:09:12.6 | HIP 71041 | 18.95 |
| 2026-04-04 00:00 | 14:31:22.25 | +02:11:11.8 | HIP 71041 | 21.58 |
| 2026-04-04 12:00 | 14:31:05.67 | +02:13:10.5 | HIP 71041 | 24.79 |
| 2026-04-05 00:00 | 14:30:48.97 | +02:15:08.5 | HIP 71041 | 28.39 |
| 2026-04-05 12:00 | 14:30:32.16 | +02:17:06.0 | HIP 71041 | 32.25 |
| 2026-04-06 00:00 | 14:30:15.24 | +02:19:02.9 | HIP 70725 | 35.91 |
| 2026-04-06 12:00 | 14:29:58.22 | +02:20:59.1 | HIP 70725 | 31.47 |
| 2026-04-07 00:00 | 14:29:41.09 | +02:22:54.7 | HIP 70725 | 27.08 |
| 2026-04-07 12:00 | 14:29:23.87 | +02:24:49.6 | HIP 70725 | 22.79 |
| 2026-04-08 00:00 | 14:29:06.54 | +02:26:43.8 | HIP 70725 | 18.68 |
| 2026-04-08 12:00 | 14:28:49.13 | +02:28:37.2 | HIP 70725 | 14.91 |
| 2026-04-09 00:00 | 14:28:31.62 | +02:30:30.0 | HIP 70725 | 11.83 |
| 2026-04-09 12:00 | 14:28:14.02 | +02:32:21.9 | HIP 70725 | 10.12 |
| 2026-04-10 00:00 | 14:27:56.34 | +02:34:13.1 | HIP 70725 | 10.50 |
| 2026-04-10 12:00 | 14:27:38.58 | +02:36:03.5 | HIP 70725 | 12.80 |
| 2026-04-11 00:00 | 14:27:20.74 | +02:37:53.1 | HIP 70725 | 16.23 |
| 2026-04-11 12:00 | 14:27:02.83 | +02:39:41.8 | HIP 70725 | 20.23 |
| 2026-04-12 00:00 | 14:26:44.85 | +02:41:29.6 | HIP 70600 | 23.72 |
| 2026-04-12 12:00 | 14:26:26.79 | +02:43:16.6 | HIP 70600 | 21.49 |
| 2026-04-13 00:00 | 14:26:08.68 | +02:45:02.7 | HIP 70600 | 20.22 |
| 2026-04-13 12:00 | 14:25:50.50 | +02:46:47.8 | HIP 70600 | 20.09 |
| 2026-04-14 00:00 | 14:25:32.26 | +02:48:32.0 | HIP 70450 | 20.89 |
| 2026-04-14 12:00 | 14:25:13.97 | +02:50:15.2 | HIP 70450 | 19.93 |
| 2026-04-15 00:00 | 14:24:55.63 | +02:51:57.5 | HIP 70450 | 20.13 |
| 2026-04-15 12:00 | 14:24:37.24 | +02:53:38.7 | HIP 70450 | 21.45 |
| 2026-04-16 00:00 | 14:24:18.80 | +02:55:19.0 | HIP 70450 | 23.71 |