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
$$ M_a = (-0.869 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | -0.869 |
| n | 6.000 |
| gf | 1.000 |
| gb | -0.998 |
| 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 | 2025-05-23 | +10.8979 | -9.443 |
| 2025-05-23 | 2026-03-24 | -2.7579 | +2.097 |
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 | 03:08:34.03 | -25:47:12.4 | HIP 14508 | 21.58 |
| 2026-03-26 12:00 | 03:08:57.75 | -25:42:04.3 | HIP 14728 | 23.21 |
| 2026-03-27 00:00 | 03:09:21.57 | -25:36:56.9 | HIP 14728 | 15.80 |
| 2026-03-27 12:00 | 03:09:45.48 | -25:31:50.3 | HIP 14728 | 8.39 |
| 2026-03-28 00:00 | 03:10:09.48 | -25:26:44.5 | HIP 14728 | 1.19 |
| 2026-03-28 12:00 | 03:10:33.57 | -25:21:39.4 | HIP 14728 | 6.57 |
| 2026-03-29 00:00 | 03:10:57.75 | -25:16:35.1 | HIP 14728 | 14.00 |
| 2026-03-29 12:00 | 03:11:22.02 | -25:11:31.6 | HIP 14798 | 21.43 |
| 2026-03-30 00:00 | 03:11:46.38 | -25:06:28.8 | HIP 14798 | 18.42 |
| 2026-03-30 12:00 | 03:12:10.82 | -25:01:26.8 | HIP 14798 | 18.23 |
| 2026-03-31 00:00 | 03:12:35.35 | -24:56:25.6 | HIP 15016 | 13.80 |
| 2026-03-31 12:00 | 03:12:59.97 | -24:51:25.2 | HIP 15016 | 7.76 |
| 2026-04-01 00:00 | 03:13:24.68 | -24:46:25.6 | HIP 15016 | 6.48 |
| 2026-04-01 12:00 | 03:13:49.46 | -24:41:26.7 | HIP 15016 | 11.67 |
| 2026-04-02 00:00 | 03:14:14.33 | -24:36:28.7 | HIP 15016 | 18.53 |
| 2026-04-02 12:00 | 03:14:39.29 | -24:31:31.5 | HIP 15051 | 16.66 |
| 2026-04-03 00:00 | 03:15:04.33 | -24:26:35.0 | HIP 15051 | 17.49 |
| 2026-04-03 12:00 | 03:15:29.45 | -24:21:39.4 | HIP 15051 | 21.19 |
| 2026-04-04 00:00 | 03:15:54.65 | -24:16:44.7 | HIP 15051 | 26.60 |
| 2026-04-04 12:00 | 03:16:19.93 | -24:11:50.7 | HIP 15392 | 29.27 |
| 2026-04-05 00:00 | 03:16:45.29 | -24:06:57.5 | HIP 15392 | 22.94 |
| 2026-04-05 12:00 | 03:17:10.73 | -24:02:05.2 | HIP 15392 | 17.59 |
| 2026-04-06 00:00 | 03:17:36.25 | -23:57:13.8 | HIP 15392 | 14.37 |
| 2026-04-06 12:00 | 03:18:01.84 | -23:52:23.1 | HIP 15392 | 14.77 |
| 2026-04-07 00:00 | 03:18:27.52 | -23:47:33.3 | HIP 15392 | 18.56 |
| 2026-04-07 12:00 | 03:18:53.27 | -23:42:44.4 | HIP 15392 | 24.20 |
| 2026-04-08 00:00 | 03:19:19.10 | -23:37:56.3 | HIP 15579 | 27.40 |
| 2026-04-08 12:00 | 03:19:45.00 | -23:33:09.1 | HIP 15579 | 19.85 |
| 2026-04-09 00:00 | 03:20:10.97 | -23:28:22.7 | HIP 15579 | 12.38 |
| 2026-04-09 12:00 | 03:20:37.03 | -23:23:37.2 | HIP 15579 | 5.40 |
| 2026-04-10 00:00 | 03:21:03.15 | -23:18:52.6 | HIP 15579 | 4.69 |
| 2026-04-10 12:00 | 03:21:29.35 | -23:14:08.9 | HIP 15579 | 11.50 |
| 2026-04-11 00:00 | 03:21:55.62 | -23:09:26.0 | HIP 15734 | 16.02 |
| 2026-04-11 12:00 | 03:22:21.96 | -23:04:44.1 | HIP 15734 | 8.54 |
| 2026-04-12 00:00 | 03:22:48.37 | -23:00:03.0 | HIP 15734 | 2.66 |
| 2026-04-12 12:00 | 03:23:14.85 | -22:55:22.8 | HIP 15734 | 7.69 |
| 2026-04-13 00:00 | 03:23:41.40 | -22:50:43.5 | HIP 15734 | 15.15 |
| 2026-04-13 12:00 | 03:24:08.02 | -22:46:05.2 | HIP 15734 | 22.77 |
| 2026-04-14 00:00 | 03:24:34.71 | -22:41:27.7 | HIP 16010 | 25.44 |
| 2026-04-14 12:00 | 03:25:01.47 | -22:36:51.2 | HIP 16010 | 23.45 |
| 2026-04-15 00:00 | 03:25:28.29 | -22:32:15.6 | HIP 16010 | 23.87 |
| 2026-04-15 12:00 | 03:25:55.18 | -22:27:41.0 | HIP 16006 | 18.26 |
| 2026-04-16 00:00 | 03:26:22.13 | -22:23:07.2 | HIP 16006 | 13.88 |