C/2024 S1 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 S1 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-10-28T11:39:10.923840Z |
| Orbit solution date (soln_date, UTC) | 2025-09-09T12:42:42Z |
| Obs used | 289 |
| NEO | - |
| M1 | 15.300 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2024-09-27T14:47:46.464000Z |
| Discovery magnitude (MPC) | 15.30 o |
| Discovery observatory (MPC) | T05 · ATLAS-HKO, Haleakala |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2024-10-05.0000000 |
| e | 0.99991737 |
| q (au) | 0.007954 |
| a (au) | 96.258164 |
| i (deg) | 141.901469 |
| Ω (om, deg) | 347.150011 |
| ω (w, deg) | 69.163122 |
| M (ma, deg) | 359.975490 |
等級
散乱 + 全体線形
$$ M_a = (13.136 + 2.570\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 13.136 |
| n | 2.570 |
| gf | 0.800 |
| 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 |
|---|---|---|---|
| 2024-09-27 | 2024-10-10 | -1.0443 | +0.222 |
| 2024-10-10 | 2024-10-17 | +5.6025 | +1.583 |
| 2024-10-17 | 2024-10-20 | +8.6854 | +1.949 |
| 2024-10-20 | 2024-10-26 | -2.1925 | -1.747 |
| 2024-10-26 | 2024-10-27 | +0.2951 | -0.121 |
| 2024-10-27 | 2024-10-28 | -11.5966 | -13.835 |
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 | 06:42:24.73 | -07:55:01.1 | HIP 32176 | 12.77 |
| 2026-06-01 12:00 | 06:42:37.24 | -07:54:26.0 | HIP 32176 | 10.88 |
| 2026-06-02 00:00 | 06:42:49.78 | -07:53:51.8 | HIP 32176 | 9.64 |
| 2026-06-02 12:00 | 06:43:02.35 | -07:53:18.4 | HIP 32176 | 9.34 |
| 2026-06-03 00:00 | 06:43:14.96 | -07:52:46.0 | HIP 32176 | 10.07 |
| 2026-06-03 12:00 | 06:43:27.60 | -07:52:14.5 | HIP 32176 | 11.63 |
| 2026-06-04 00:00 | 06:43:40.26 | -07:51:43.9 | HIP 32176 | 13.75 |
| 2026-06-04 12:00 | 06:43:52.96 | -07:51:14.1 | HIP 32176 | 16.22 |
| 2026-06-05 00:00 | 06:44:05.68 | -07:50:45.3 | HIP 32176 | 18.89 |
| 2026-06-05 12:00 | 06:44:18.44 | -07:50:17.3 | HIP 32176 | 21.71 |
| 2026-06-06 00:00 | 06:44:31.22 | -07:49:50.2 | HIP 32176 | 24.61 |
| 2026-06-06 12:00 | 06:44:44.02 | -07:49:24.1 | HIP 32176 | 27.58 |
| 2026-06-07 00:00 | 06:44:56.86 | -07:48:58.8 | HIP 32176 | 30.59 |
| 2026-06-07 12:00 | 06:45:09.72 | -07:48:34.4 | HIP 32407 | 30.64 |
| 2026-06-08 00:00 | 06:45:22.60 | -07:48:10.9 | HIP 32407 | 29.18 |
| 2026-06-08 12:00 | 06:45:35.51 | -07:47:48.3 | HIP 32407 | 28.02 |
| 2026-06-09 00:00 | 06:45:48.44 | -07:47:26.5 | HIP 32407 | 27.20 |
| 2026-06-09 12:00 | 06:46:01.39 | -07:47:05.7 | HIP 32407 | 26.77 |
| 2026-06-10 00:00 | 06:46:14.37 | -07:46:45.8 | HIP 32407 | 26.74 |
| 2026-06-10 12:00 | 06:46:27.37 | -07:46:26.7 | HIP 32407 | 27.12 |
| 2026-06-11 00:00 | 06:46:40.39 | -07:46:08.5 | HIP 32622 | 25.08 |
| 2026-06-11 12:00 | 06:46:53.42 | -07:45:51.2 | HIP 32622 | 21.84 |
| 2026-06-12 00:00 | 06:47:06.48 | -07:45:34.8 | HIP 32622 | 18.60 |
| 2026-06-12 12:00 | 06:47:19.56 | -07:45:19.3 | HIP 32622 | 15.36 |
| 2026-06-13 00:00 | 06:47:32.65 | -07:45:04.7 | HIP 32622 | 12.12 |
| 2026-06-13 12:00 | 06:47:45.76 | -07:44:50.9 | HIP 32622 | 8.88 |
| 2026-06-14 00:00 | 06:47:58.89 | -07:44:38.1 | HIP 32622 | 5.65 |
| 2026-06-14 12:00 | 06:48:12.03 | -07:44:26.1 | HIP 32622 | 2.51 |
| 2026-06-15 00:00 | 06:48:25.19 | -07:44:15.0 | HIP 32622 | 1.36 |
| 2026-06-15 12:00 | 06:48:38.36 | -07:44:04.8 | HIP 32622 | 4.33 |
| 2026-06-16 00:00 | 06:48:51.55 | -07:43:55.4 | HIP 32622 | 7.55 |
| 2026-06-16 12:00 | 06:49:04.74 | -07:43:47.0 | HIP 32622 | 10.80 |
| 2026-06-17 00:00 | 06:49:17.95 | -07:43:39.4 | HIP 32622 | 14.06 |
| 2026-06-17 12:00 | 06:49:31.17 | -07:43:32.7 | HIP 32622 | 17.33 |
| 2026-06-18 00:00 | 06:49:44.40 | -07:43:26.9 | HIP 32724 | 18.83 |
| 2026-06-18 12:00 | 06:49:57.64 | -07:43:21.9 | HIP 32724 | 19.40 |
| 2026-06-19 00:00 | 06:50:10.89 | -07:43:17.8 | HIP 32724 | 20.50 |
| 2026-06-19 12:00 | 06:50:24.14 | -07:43:14.6 | HIP 32838 | 19.74 |
| 2026-06-20 00:00 | 06:50:37.40 | -07:43:12.2 | HIP 32838 | 19.29 |
| 2026-06-20 12:00 | 06:50:50.67 | -07:43:10.7 | HIP 32838 | 19.39 |
| 2026-06-21 00:00 | 06:51:03.94 | -07:43:10.1 | HIP 32838 | 20.02 |
| 2026-06-21 12:00 | 06:51:17.22 | -07:43:10.3 | HIP 32838 | 21.14 |
| 2026-06-22 00:00 | 06:51:30.51 | -07:43:11.4 | HIP 32838 | 22.67 |