C/2024 T5 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 T5 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-05-06T04:23:48.272640Z |
| Orbit solution date (soln_date, UTC) | 2026-07-28T14:12:17Z |
| Obs used | 1420 |
| 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) | 2025-10-01.0000000 |
| e | 1.00231295 |
| q (au) | 3.840803 |
| a (au) | -1660.563732 |
| i (deg) | 52.386782 |
| Ω (om, deg) | 100.680236 |
| ω (w, deg) | 352.448197 |
| M (ma, deg) | -0.008480 |
等級
散乱 + 全体線形
$$ M_a = (-0.854 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | -0.854 |
| n | 6.000 |
| gf | 0.983 |
| gb | -0.959 |
| k | 1.000 |
| δ90 | 9.986 |
| 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 | 2025-05-07 | +11.4272 | -9.941 |
| 2025-05-07 | 2026-02-17 | -2.1000 | +1.567 |
| 2026-02-17 | 2026-07-27 | -11.3569 | +8.318 |
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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 05:06:35.78 | -13:08:57.4 | HIP 23777 | 1.61 |
| 2026-07-29 12:00 | 05:07:01.70 | -13:08:15.6 | HIP 23777 | 6.15 |
| 2026-07-30 00:00 | 05:07:27.54 | -13:07:34.9 | HIP 23777 | 12.37 |
| 2026-07-30 12:00 | 05:07:53.30 | -13:06:55.2 | HIP 23951 | 18.57 |
| 2026-07-31 00:00 | 05:08:18.97 | -13:06:16.5 | HIP 23951 | 13.83 |
| 2026-07-31 12:00 | 05:08:44.56 | -13:05:38.9 | HIP 23951 | 10.81 |
| 2026-08-01 00:00 | 05:09:10.07 | -13:05:02.2 | HIP 23951 | 11.02 |
| 2026-08-01 12:00 | 05:09:35.49 | -13:04:26.7 | HIP 23951 | 14.27 |
| 2026-08-02 00:00 | 05:10:00.82 | -13:03:52.1 | HIP 23951 | 19.05 |
| 2026-08-02 12:00 | 05:10:26.06 | -13:03:18.5 | HIP 23951 | 24.46 |
| 2026-08-03 00:00 | 05:10:51.21 | -13:02:46.0 | HIP 23951 | 30.14 |
| 2026-08-03 12:00 | 05:11:16.28 | -13:02:14.5 | HIP 24327 | 29.22 |
| 2026-08-04 00:00 | 05:11:41.25 | -13:01:43.9 | HIP 24327 | 23.17 |
| 2026-08-04 12:00 | 05:12:06.13 | -13:01:14.4 | HIP 24327 | 17.18 |
| 2026-08-05 00:00 | 05:12:30.92 | -13:00:45.9 | HIP 24327 | 11.31 |
| 2026-08-05 12:00 | 05:12:55.62 | -13:00:18.4 | HIP 24327 | 5.87 |
| 2026-08-06 00:00 | 05:13:20.22 | -12:59:51.9 | HIP 24327 | 3.72 |
| 2026-08-06 12:00 | 05:13:44.72 | -12:59:26.3 | HIP 24327 | 8.08 |
| 2026-08-07 00:00 | 05:14:09.13 | -12:59:01.8 | HIP 24327 | 13.70 |
| 2026-08-07 12:00 | 05:14:33.44 | -12:58:38.2 | HIP 24499 | 15.19 |
| 2026-08-08 00:00 | 05:14:57.65 | -12:58:15.7 | HIP 24499 | 10.91 |
| 2026-08-08 12:00 | 05:15:21.76 | -12:57:54.1 | HIP 24499 | 8.81 |
| 2026-08-09 00:00 | 05:15:45.76 | -12:57:33.4 | HIP 24499 | 10.26 |
| 2026-08-09 12:00 | 05:16:09.67 | -12:57:13.8 | HIP 24499 | 14.19 |
| 2026-08-10 00:00 | 05:16:33.47 | -12:56:55.1 | HIP 24499 | 19.10 |
| 2026-08-10 12:00 | 05:16:57.16 | -12:56:37.3 | HIP 24499 | 24.39 |
| 2026-08-11 00:00 | 05:17:20.75 | -12:56:20.5 | HIP 24499 | 29.85 |
| 2026-08-11 12:00 | 05:17:44.23 | -12:56:04.7 | HIP 24731 | 27.91 |
| 2026-08-12 00:00 | 05:18:07.60 | -12:55:49.8 | HIP 24845 | 25.82 |
| 2026-08-12 12:00 | 05:18:30.87 | -12:55:35.8 | HIP 24845 | 21.58 |
| 2026-08-13 00:00 | 05:18:54.02 | -12:55:22.8 | HIP 24845 | 18.14 |
| 2026-08-13 12:00 | 05:19:17.06 | -12:55:10.6 | HIP 24845 | 16.01 |
| 2026-08-14 00:00 | 05:19:39.98 | -12:54:59.4 | HIP 24845 | 15.67 |
| 2026-08-14 12:00 | 05:20:02.79 | -12:54:49.1 | HIP 24845 | 17.22 |
| 2026-08-15 00:00 | 05:20:25.49 | -12:54:39.7 | HIP 24845 | 20.21 |
| 2026-08-15 12:00 | 05:20:48.07 | -12:54:31.1 | HIP 24845 | 24.08 |
| 2026-08-16 00:00 | 05:21:10.53 | -12:54:23.5 | HIP 24845 | 28.45 |
| 2026-08-16 12:00 | 05:21:32.87 | -12:54:16.7 | HIP 24937 | 32.36 |
| 2026-08-17 00:00 | 05:21:55.09 | -12:54:10.8 | HIP 24937 | 35.21 |
| 2026-08-17 12:00 | 05:22:17.19 | -12:54:05.7 | HIP 24937 | 38.59 |
| 2026-08-18 00:00 | 05:22:39.18 | -12:54:01.5 | HIP 24937 | 42.35 |
| 2026-08-18 12:00 | 05:23:01.03 | -12:53:58.2 | HIP 25353 | 39.76 |
| 2026-08-19 00:00 | 05:23:22.77 | -12:53:55.6 | HIP 25353 | 35.32 |