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 · University of Arizona 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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 14:28:14.97 | -03:17:49.3 | HIP 70747 | 17.77 |
| 2026-09-20 12:00 | 14:28:35.05 | -03:20:09.3 | HIP 70747 | 21.31 |
| 2026-09-21 00:00 | 14:28:55.18 | -03:22:29.1 | HIP 70747 | 25.57 |
| 2026-09-21 12:00 | 14:29:15.37 | -03:24:48.7 | HIP 70947 | 28.37 |
| 2026-09-22 00:00 | 14:29:35.62 | -03:27:08.1 | HIP 70947 | 26.48 |
| 2026-09-22 12:00 | 14:29:55.91 | -03:29:27.3 | HIP 70947 | 25.66 |
| 2026-09-23 00:00 | 14:30:16.26 | -03:31:46.2 | HIP 70947 | 26.03 |
| 2026-09-23 12:00 | 14:30:36.67 | -03:34:05.0 | HIP 70947 | 27.55 |
| 2026-09-24 00:00 | 14:30:57.13 | -03:36:23.4 | HIP 70937 | 28.31 |
| 2026-09-24 12:00 | 14:31:17.63 | -03:38:41.7 | HIP 70937 | 27.82 |
| 2026-09-25 00:00 | 14:31:38.19 | -03:40:59.7 | HIP 71173 | 26.72 |
| 2026-09-25 12:00 | 14:31:58.80 | -03:43:17.4 | HIP 71173 | 21.30 |
| 2026-09-26 00:00 | 14:32:19.46 | -03:45:35.0 | HIP 71173 | 16.02 |
| 2026-09-26 12:00 | 14:32:40.17 | -03:47:52.2 | HIP 71173 | 11.08 |
| 2026-09-27 00:00 | 14:33:00.92 | -03:50:09.2 | HIP 71173 | 7.24 |
| 2026-09-27 12:00 | 14:33:21.73 | -03:52:26.0 | HIP 71173 | 6.80 |
| 2026-09-28 00:00 | 14:33:42.58 | -03:54:42.5 | HIP 71173 | 10.21 |
| 2026-09-28 12:00 | 14:34:03.48 | -03:56:58.7 | HIP 71173 | 15.06 |
| 2026-09-29 00:00 | 14:34:24.43 | -03:59:14.7 | HIP 71173 | 20.36 |
| 2026-09-29 12:00 | 14:34:45.42 | -04:01:30.4 | HIP 71410 | 25.79 |
| 2026-09-30 00:00 | 14:35:06.45 | -04:03:45.8 | HIP 71410 | 23.26 |
| 2026-09-30 12:00 | 14:35:27.53 | -04:06:00.9 | HIP 71410 | 21.95 |
| 2026-10-01 00:00 | 14:35:48.66 | -04:08:15.8 | HIP 71462 | 18.34 |
| 2026-10-01 12:00 | 14:36:09.83 | -04:10:30.4 | HIP 71462 | 12.63 |
| 2026-10-02 00:00 | 14:36:31.04 | -04:12:44.7 | HIP 71462 | 6.96 |
| 2026-10-02 12:00 | 14:36:52.29 | -04:14:58.7 | HIP 71462 | 1.81 |
| 2026-10-03 00:00 | 14:37:13.59 | -04:17:12.4 | HIP 71462 | 4.93 |
| 2026-10-03 12:00 | 14:37:34.93 | -04:19:25.8 | HIP 71462 | 10.58 |
| 2026-10-04 00:00 | 14:37:56.31 | -04:21:38.9 | HIP 71462 | 16.31 |
| 2026-10-04 12:00 | 14:38:17.72 | -04:23:51.7 | HIP 71462 | 22.08 |
| 2026-10-05 00:00 | 14:38:39.18 | -04:26:04.2 | HIP 71462 | 27.85 |
| 2026-10-05 12:00 | 14:39:00.68 | -04:28:16.4 | HIP 71462 | 33.64 |
| 2026-10-06 00:00 | 14:39:22.22 | -04:30:28.3 | HIP 71803 | 38.63 |
| 2026-10-06 12:00 | 14:39:43.79 | -04:32:39.8 | HIP 71803 | 33.26 |
| 2026-10-07 00:00 | 14:40:05.40 | -04:34:51.0 | HIP 71803 | 28.05 |
| 2026-10-07 12:00 | 14:40:27.05 | -04:37:01.9 | HIP 71803 | 23.14 |
| 2026-10-08 00:00 | 14:40:48.73 | -04:39:12.5 | HIP 71803 | 18.75 |
| 2026-10-08 12:00 | 14:41:10.45 | -04:41:22.7 | HIP 71803 | 15.36 |
| 2026-10-09 00:00 | 14:41:32.20 | -04:43:32.6 | HIP 71879 | 11.87 |
| 2026-10-09 12:00 | 14:41:53.99 | -04:45:42.1 | HIP 71879 | 6.57 |
| 2026-10-10 00:00 | 14:42:15.81 | -04:47:51.3 | HIP 71879 | 3.73 |
| 2026-10-10 12:00 | 14:42:37.66 | -04:50:00.1 | HIP 71879 | 7.29 |
| 2026-10-11 00:00 | 14:42:59.54 | -04:52:08.6 | HIP 71879 | 12.69 |