C/2024 T5 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 T5 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2027-05-06T04:34:00.278400Z |
| Orbit solution date (soln_date, UTC) | 2026-03-31T09:42:19Z |
| Obs used | 1384 |
| 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) | 2025-09-23.0000000 |
| e | 1.00229078 |
| q (au) | 3.840922 |
| a (au) | -1676.689975 |
| i (deg) | 52.386788 |
| Ω (om, deg) | 100.680211 |
| ω (w, deg) | 352.446782 |
| M (ma, deg) | -0.008473 |
等級
散乱 + 全体線形
$$ M_a = (-0.864 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | -0.864 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.500 |
| k | 1.000 |
| 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 | 2025-05-07 | +11.6961 | -10.177 |
| 2025-05-07 | 2026-03-24 | -2.3602 | +1.780 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 04:10:48.51 | -16:37:01.6 | HIP 19398 | 25.79 |
| 2026-06-01 12:00 | 04:11:18.59 | -16:34:07.2 | HIP 19398 | 30.96 |
| 2026-06-02 00:00 | 04:11:48.68 | -16:31:14.0 | HIP 19562 | 33.59 |
| 2026-06-02 12:00 | 04:12:18.77 | -16:28:21.9 | HIP 19562 | 32.84 |
| 2026-06-03 00:00 | 04:12:48.86 | -16:25:31.0 | HIP 19752 | 31.52 |
| 2026-06-03 12:00 | 04:13:18.96 | -16:22:41.2 | HIP 19752 | 25.46 |
| 2026-06-04 00:00 | 04:13:49.06 | -16:19:52.6 | HIP 19820 | 19.34 |
| 2026-06-04 12:00 | 04:14:19.16 | -16:17:05.1 | HIP 19820 | 11.68 |
| 2026-06-05 00:00 | 04:14:49.26 | -16:14:18.8 | HIP 19820 | 4.37 |
| 2026-06-05 12:00 | 04:15:19.37 | -16:11:33.6 | HIP 19839 | 1.65 |
| 2026-06-06 00:00 | 04:15:49.47 | -16:08:49.6 | HIP 19839 | 9.35 |
| 2026-06-06 12:00 | 04:16:19.57 | -16:06:06.7 | HIP 19839 | 17.07 |
| 2026-06-07 00:00 | 04:16:49.67 | -16:03:25.1 | HIP 19839 | 24.78 |
| 2026-06-07 12:00 | 04:17:19.77 | -16:00:44.5 | HIP 19839 | 32.49 |
| 2026-06-08 00:00 | 04:17:49.87 | -15:58:05.2 | HIP 19839 | 40.20 |
| 2026-06-08 12:00 | 04:18:19.96 | -15:55:27.0 | HIP 20229 | 40.42 |
| 2026-06-09 00:00 | 04:18:50.05 | -15:52:49.9 | HIP 20229 | 38.41 |
| 2026-06-09 12:00 | 04:19:20.14 | -15:50:14.1 | HIP 20229 | 37.87 |
| 2026-06-10 00:00 | 04:19:50.22 | -15:47:39.4 | HIP 20394 | 34.21 |
| 2026-06-10 12:00 | 04:20:20.29 | -15:45:05.9 | HIP 20394 | 26.56 |
| 2026-06-11 00:00 | 04:20:50.36 | -15:42:33.5 | HIP 20394 | 18.95 |
| 2026-06-11 12:00 | 04:21:20.42 | -15:40:02.4 | HIP 20394 | 11.42 |
| 2026-06-12 00:00 | 04:21:50.47 | -15:37:32.4 | HIP 20394 | 4.41 |
| 2026-06-12 12:00 | 04:22:20.52 | -15:35:03.6 | HIP 20394 | 5.06 |
| 2026-06-13 00:00 | 04:22:50.55 | -15:32:36.0 | HIP 20394 | 12.19 |
| 2026-06-13 12:00 | 04:23:20.58 | -15:30:09.5 | HIP 20394 | 19.71 |
| 2026-06-14 00:00 | 04:23:50.59 | -15:27:44.3 | HIP 20394 | 27.28 |
| 2026-06-14 12:00 | 04:24:20.59 | -15:25:20.2 | HIP 20682 | 25.79 |
| 2026-06-15 00:00 | 04:24:50.58 | -15:22:57.3 | HIP 20682 | 21.92 |
| 2026-06-15 12:00 | 04:25:20.56 | -15:20:35.6 | HIP 20682 | 20.27 |
| 2026-06-16 00:00 | 04:25:50.52 | -15:18:15.1 | HIP 20682 | 21.34 |
| 2026-06-16 12:00 | 04:26:20.46 | -15:15:55.7 | HIP 20682 | 24.79 |
| 2026-06-17 00:00 | 04:26:50.39 | -15:13:37.6 | HIP 20854 | 18.73 |
| 2026-06-17 12:00 | 04:27:20.31 | -15:11:20.6 | HIP 20854 | 11.32 |
| 2026-06-18 00:00 | 04:27:50.20 | -15:09:04.8 | HIP 20854 | 4.45 |
| 2026-06-18 12:00 | 04:28:20.08 | -15:06:50.2 | HIP 20854 | 5.06 |
| 2026-06-19 00:00 | 04:28:49.94 | -15:04:36.8 | HIP 20903 | 5.86 |
| 2026-06-19 12:00 | 04:29:19.78 | -15:02:24.5 | HIP 20903 | 7.94 |
| 2026-06-20 00:00 | 04:29:49.60 | -15:00:13.5 | HIP 21028 | 11.45 |
| 2026-06-20 12:00 | 04:30:19.39 | -14:58:03.6 | HIP 21028 | 7.89 |
| 2026-06-21 00:00 | 04:30:49.17 | -14:55:54.8 | HIP 21028 | 10.29 |
| 2026-06-21 12:00 | 04:31:18.92 | -14:53:47.3 | HIP 21028 | 16.17 |
| 2026-06-22 00:00 | 04:31:48.65 | -14:51:40.9 | HIP 21028 | 22.99 |