C/2024 T5 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 T5 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-05-06T04:36:57.044160Z |
| Orbit solution date (soln_date, UTC) | 2026-09-08T09:12:16Z |
| Obs used | 1520 |
| NEO | - |
| M1 | 5.900 |
| K1 | 7.750 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2024-10-02T22:18:01.411200Z |
| Discovery magnitude (MPC) | 19.20 o |
| Discovery observatory (MPC) | M22 · ATLAS South Africa, Sutherland |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-10-23.0000000 |
| e | 1.00230061 |
| q (au) | 3.840637 |
| a (au) | -1669.402993 |
| i (deg) | 52.386791 |
| Ω (om, deg) | 100.680143 |
| ω (w, deg) | 352.451595 |
| M (ma, deg) | -0.008095 |
等級
散乱 + 全体線形
$$ M_a = (3.098 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 3.098 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.749 |
| 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 |
|---|---|---|---|
| 2024-10-02 | 2025-05-23 | +10.9427 | -9.325 |
| 2025-05-23 | 2025-12-11 | +0.2275 | -0.267 |
| 2025-12-11 | 2026-09-26 | -8.1201 | +5.982 |
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 | 05:41:25.34 | -13:13:54.5 | HIP 26858 | 17.94 |
| 2026-09-20 12:00 | 05:41:36.56 | -13:14:26.9 | HIP 26858 | 16.96 |
| 2026-09-21 00:00 | 05:41:47.58 | -13:14:59.4 | HIP 26858 | 16.41 |
| 2026-09-21 12:00 | 05:41:58.39 | -13:15:32.1 | HIP 26858 | 16.32 |
| 2026-09-22 00:00 | 05:42:09.00 | -13:16:04.8 | HIP 26858 | 16.67 |
| 2026-09-22 12:00 | 05:42:19.41 | -13:16:37.6 | HIP 26858 | 17.41 |
| 2026-09-23 00:00 | 05:42:29.61 | -13:17:10.5 | HIP 26858 | 18.47 |
| 2026-09-23 12:00 | 05:42:39.60 | -13:17:43.4 | HIP 26858 | 19.79 |
| 2026-09-24 00:00 | 05:42:49.39 | -13:18:16.3 | HIP 26858 | 21.29 |
| 2026-09-24 12:00 | 05:42:58.97 | -13:18:49.3 | HIP 26858 | 22.93 |
| 2026-09-25 00:00 | 05:43:08.33 | -13:19:22.2 | HIP 26858 | 24.66 |
| 2026-09-25 12:00 | 05:43:17.49 | -13:19:55.2 | HIP 26858 | 26.46 |
| 2026-09-26 00:00 | 05:43:26.43 | -13:20:28.1 | HIP 26858 | 28.29 |
| 2026-09-26 12:00 | 05:43:35.16 | -13:21:00.9 | HIP 26858 | 30.14 |
| 2026-09-27 00:00 | 05:43:43.67 | -13:21:33.7 | HIP 26858 | 32.00 |
| 2026-09-27 12:00 | 05:43:51.97 | -13:22:06.4 | HIP 27202 | 32.06 |
| 2026-09-28 00:00 | 05:44:00.05 | -13:22:39.0 | HIP 27202 | 30.38 |
| 2026-09-28 12:00 | 05:44:07.91 | -13:23:11.5 | HIP 27202 | 28.79 |
| 2026-09-29 00:00 | 05:44:15.55 | -13:23:43.8 | HIP 27202 | 27.30 |
| 2026-09-29 12:00 | 05:44:22.97 | -13:24:16.0 | HIP 27202 | 25.92 |
| 2026-09-30 00:00 | 05:44:30.17 | -13:24:48.0 | HIP 27202 | 24.65 |
| 2026-09-30 12:00 | 05:44:37.15 | -13:25:19.9 | HIP 27202 | 23.50 |
| 2026-10-01 00:00 | 05:44:43.91 | -13:25:51.5 | HIP 27202 | 22.47 |
| 2026-10-01 12:00 | 05:44:50.43 | -13:26:22.9 | HIP 27202 | 21.57 |
| 2026-10-02 00:00 | 05:44:56.73 | -13:26:54.1 | HIP 27202 | 20.80 |
| 2026-10-02 12:00 | 05:45:02.81 | -13:27:25.0 | HIP 27202 | 20.16 |
| 2026-10-03 00:00 | 05:45:08.65 | -13:27:55.7 | HIP 27202 | 19.66 |
| 2026-10-03 12:00 | 05:45:14.26 | -13:28:26.0 | HIP 27202 | 19.29 |
| 2026-10-04 00:00 | 05:45:19.64 | -13:28:56.0 | HIP 27202 | 19.05 |
| 2026-10-04 12:00 | 05:45:24.79 | -13:29:25.6 | HIP 27202 | 18.93 |
| 2026-10-05 00:00 | 05:45:29.70 | -13:29:54.9 | HIP 27202 | 18.92 |
| 2026-10-05 12:00 | 05:45:34.38 | -13:30:23.9 | HIP 27202 | 19.00 |
| 2026-10-06 00:00 | 05:45:38.83 | -13:30:52.4 | HIP 27202 | 19.18 |
| 2026-10-06 12:00 | 05:45:43.03 | -13:31:20.4 | HIP 27202 | 19.42 |
| 2026-10-07 00:00 | 05:45:47.00 | -13:31:48.0 | HIP 27202 | 19.73 |
| 2026-10-07 12:00 | 05:45:50.72 | -13:32:15.2 | HIP 27202 | 20.08 |
| 2026-10-08 00:00 | 05:45:54.21 | -13:32:41.8 | HIP 27202 | 20.48 |
| 2026-10-08 12:00 | 05:45:57.46 | -13:33:07.9 | HIP 27202 | 20.90 |
| 2026-10-09 00:00 | 05:46:00.46 | -13:33:33.4 | HIP 27202 | 21.34 |
| 2026-10-09 12:00 | 05:46:03.22 | -13:33:58.4 | HIP 27202 | 21.79 |
| 2026-10-10 00:00 | 05:46:05.73 | -13:34:22.8 | HIP 27202 | 22.24 |
| 2026-10-10 12:00 | 05:46:08.01 | -13:34:46.5 | HIP 27202 | 22.69 |
| 2026-10-11 00:00 | 05:46:10.03 | -13:35:09.6 | HIP 27202 | 23.14 |