C/2025 L1 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2025 L1 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2026-01-12T17:37:48.472320Z |
| Orbit solution date (soln_date, UTC) | 2026-05-28T12:12:16Z |
| Obs used | 132 |
| NEO | - |
| M1 | 14.300 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2025-06-06T09:16:16.579200Z |
| Discovery magnitude (MPC) | 18.22 c |
| Discovery observatory (MPC) | W68 · ATLAS Chile, Rio Hurtado |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2025-10-21.0000000 |
| e | 1.00145216 |
| q (au) | 1.679655 |
| a (au) | -1156.658405 |
| i (deg) | 114.136966 |
| Ω (om, deg) | 208.109186 |
| ω (w, deg) | 341.250081 |
| M (ma, deg) | -0.002098 |
等級
散乱 + 全体線形
$$ M_a = (16.149 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 16.149 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.843 |
| 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 |
|---|---|---|---|
| 2024-10-01 | 2026-01-02 | +6.9004 | -3.515 |
| 2026-01-13 | 2026-05-21 | +24.6849 | -6.161 |
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 | 11:39:42.29 | +53:07:02.7 | HIP 57023 | 22.11 |
| 2026-06-01 12:00 | 11:39:17.01 | +53:05:40.8 | HIP 57023 | 24.22 |
| 2026-06-02 00:00 | 11:38:52.57 | +53:04:16.9 | HIP 57023 | 26.65 |
| 2026-06-02 12:00 | 11:38:28.97 | +53:02:51.1 | HIP 57023 | 29.29 |
| 2026-06-03 00:00 | 11:38:06.18 | +53:01:23.6 | HIP 57023 | 32.04 |
| 2026-06-03 12:00 | 11:37:44.20 | +52:59:54.3 | HIP 57023 | 34.86 |
| 2026-06-04 00:00 | 11:37:23.02 | +52:58:23.4 | HIP 57023 | 37.69 |
| 2026-06-04 12:00 | 11:37:02.62 | +52:56:50.9 | HIP 56658 | 36.59 |
| 2026-06-05 00:00 | 11:36:42.99 | +52:55:16.9 | HIP 56658 | 35.13 |
| 2026-06-05 12:00 | 11:36:24.13 | +52:53:41.6 | HIP 56658 | 33.91 |
| 2026-06-06 00:00 | 11:36:06.02 | +52:52:04.8 | HIP 56309 | 31.75 |
| 2026-06-06 12:00 | 11:35:48.65 | +52:50:26.8 | HIP 56309 | 28.94 |
| 2026-06-07 00:00 | 11:35:32.02 | +52:48:47.5 | HIP 56309 | 26.29 |
| 2026-06-07 12:00 | 11:35:16.10 | +52:47:07.1 | HIP 56309 | 23.84 |
| 2026-06-08 00:00 | 11:35:00.90 | +52:45:25.6 | HIP 56309 | 21.62 |
| 2026-06-08 12:00 | 11:34:46.40 | +52:43:43.0 | HIP 56309 | 19.66 |
| 2026-06-09 00:00 | 11:34:32.58 | +52:41:59.5 | HIP 56337 | 17.95 |
| 2026-06-09 12:00 | 11:34:19.46 | +52:40:15.0 | HIP 56337 | 15.32 |
| 2026-06-10 00:00 | 11:34:07.00 | +52:38:29.6 | HIP 56337 | 12.77 |
| 2026-06-10 12:00 | 11:33:55.21 | +52:36:43.4 | HIP 56337 | 10.31 |
| 2026-06-11 00:00 | 11:33:44.07 | +52:34:56.4 | HIP 56337 | 7.97 |
| 2026-06-11 12:00 | 11:33:33.57 | +52:33:08.7 | HIP 56337 | 5.82 |
| 2026-06-12 00:00 | 11:33:23.72 | +52:31:20.4 | HIP 56337 | 4.07 |
| 2026-06-12 12:00 | 11:33:14.49 | +52:29:31.4 | HIP 56337 | 3.27 |
| 2026-06-13 00:00 | 11:33:05.88 | +52:27:41.8 | HIP 56337 | 3.97 |
| 2026-06-13 12:00 | 11:32:57.87 | +52:25:51.6 | HIP 56337 | 5.57 |
| 2026-06-14 00:00 | 11:32:50.48 | +52:24:01.0 | HIP 56337 | 7.47 |
| 2026-06-14 12:00 | 11:32:43.67 | +52:22:09.9 | HIP 56337 | 9.48 |
| 2026-06-15 00:00 | 11:32:37.45 | +52:20:18.5 | HIP 56337 | 11.51 |
| 2026-06-15 12:00 | 11:32:31.80 | +52:18:26.6 | HIP 56337 | 13.54 |
| 2026-06-16 00:00 | 11:32:26.72 | +52:16:34.5 | HIP 56337 | 15.55 |
| 2026-06-16 12:00 | 11:32:22.21 | +52:14:42.0 | HIP 56337 | 17.55 |
| 2026-06-17 00:00 | 11:32:18.24 | +52:12:49.4 | HIP 56337 | 19.52 |
| 2026-06-17 12:00 | 11:32:14.82 | +52:10:56.5 | HIP 56337 | 21.47 |
| 2026-06-18 00:00 | 11:32:11.93 | +52:09:03.5 | HIP 56337 | 23.40 |
| 2026-06-18 12:00 | 11:32:09.57 | +52:07:10.3 | HIP 56334 | 23.15 |
| 2026-06-19 00:00 | 11:32:07.73 | +52:05:17.1 | HIP 56334 | 21.45 |
| 2026-06-19 12:00 | 11:32:06.40 | +52:03:23.7 | HIP 56334 | 19.76 |
| 2026-06-20 00:00 | 11:32:05.58 | +52:01:30.4 | HIP 56334 | 18.09 |
| 2026-06-20 12:00 | 11:32:05.25 | +51:59:37.1 | HIP 56334 | 16.42 |
| 2026-06-21 00:00 | 11:32:05.41 | +51:57:43.8 | HIP 56334 | 14.77 |
| 2026-06-21 12:00 | 11:32:06.05 | +51:55:50.5 | HIP 56334 | 13.14 |
| 2026-06-22 00:00 | 11:32:07.17 | +51:53:57.4 | HIP 56334 | 11.54 |