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 | +0.3141 | +0.243 |
| 2024-10-10 | 2024-10-16 | -6.6405 | -0.171 |
| 2024-10-16 | 2024-10-18 | +66.8088 | +17.878 |
| 2024-10-18 | 2024-10-24 | -14.3156 | -6.251 |
| 2024-10-24 | 2024-10-26 | +18.1148 | +14.443 |
| 2024-10-26 | 2024-10-28 | -4.1798 | -4.490 |
| 2024-10-28 | 2024-10-28 | -70.2475 | -100.424 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 06:38:49.39 | -15:46:53.3 | HIP 31799 | 11.37 |
| 2026-02-03 12:00 | 06:38:32.46 | -15:44:38.9 | HIP 31799 | 14.56 |
| 2026-02-04 00:00 | 06:38:15.69 | -15:42:23.4 | HIP 31799 | 18.37 |
| 2026-02-04 12:00 | 06:37:59.07 | -15:40:07.0 | HIP 31799 | 22.48 |
| 2026-02-05 00:00 | 06:37:42.63 | -15:37:49.7 | HIP 31799 | 26.74 |
| 2026-02-05 12:00 | 06:37:26.34 | -15:35:31.4 | HIP 31799 | 31.07 |
| 2026-02-06 00:00 | 06:37:10.22 | -15:33:12.2 | HIP 31401 | 35.12 |
| 2026-02-06 12:00 | 06:36:54.26 | -15:30:52.1 | HIP 31401 | 30.69 |
| 2026-02-07 00:00 | 06:36:38.47 | -15:28:31.2 | HIP 31401 | 26.30 |
| 2026-02-07 12:00 | 06:36:22.85 | -15:26:09.3 | HIP 31401 | 21.99 |
| 2026-02-08 00:00 | 06:36:07.40 | -15:23:46.7 | HIP 31401 | 17.77 |
| 2026-02-08 12:00 | 06:35:52.12 | -15:21:23.2 | HIP 31401 | 13.72 |
| 2026-02-09 00:00 | 06:35:37.00 | -15:18:59.0 | HIP 31401 | 10.00 |
| 2026-02-09 12:00 | 06:35:22.06 | -15:16:34.0 | HIP 31401 | 7.11 |
| 2026-02-10 00:00 | 06:35:07.29 | -15:14:08.2 | HIP 31401 | 6.26 |
| 2026-02-10 12:00 | 06:34:52.69 | -15:11:41.7 | HIP 31401 | 8.06 |
| 2026-02-11 00:00 | 06:34:38.26 | -15:09:14.4 | HIP 31401 | 11.29 |
| 2026-02-11 12:00 | 06:34:24.01 | -15:06:46.5 | HIP 31401 | 15.03 |
| 2026-02-12 00:00 | 06:34:09.93 | -15:04:17.9 | HIP 31311 | 17.13 |
| 2026-02-12 12:00 | 06:33:56.03 | -15:01:48.6 | HIP 31311 | 14.43 |
| 2026-02-13 00:00 | 06:33:42.30 | -14:59:18.7 | HIP 31253 | 11.98 |
| 2026-02-13 12:00 | 06:33:28.75 | -14:56:48.1 | HIP 31253 | 8.36 |
| 2026-02-14 00:00 | 06:33:15.38 | -14:54:17.0 | HIP 31253 | 5.47 |
| 2026-02-14 12:00 | 06:33:02.18 | -14:51:45.3 | HIP 31253 | 4.82 |
| 2026-02-15 00:00 | 06:32:49.17 | -14:49:13.0 | HIP 31253 | 7.00 |
| 2026-02-15 12:00 | 06:32:36.33 | -14:46:40.1 | HIP 31253 | 10.33 |
| 2026-02-16 00:00 | 06:32:23.67 | -14:44:06.8 | HIP 31253 | 13.99 |
| 2026-02-16 12:00 | 06:32:11.19 | -14:41:32.9 | HIP 31253 | 17.75 |
| 2026-02-17 00:00 | 06:31:58.89 | -14:38:58.6 | HIP 31055 | 17.24 |
| 2026-02-17 12:00 | 06:31:46.77 | -14:36:23.8 | HIP 31055 | 13.38 |
| 2026-02-18 00:00 | 06:31:34.84 | -14:33:48.5 | HIP 31055 | 9.58 |
| 2026-02-18 12:00 | 06:31:23.08 | -14:31:12.8 | HIP 31055 | 5.93 |
| 2026-02-19 00:00 | 06:31:11.50 | -14:28:36.8 | HIP 31055 | 2.92 |
| 2026-02-19 12:00 | 06:31:00.11 | -14:26:00.3 | HIP 31055 | 3.33 |
| 2026-02-20 00:00 | 06:30:48.90 | -14:23:23.4 | HIP 31055 | 6.51 |
| 2026-02-20 12:00 | 06:30:37.87 | -14:20:46.3 | HIP 31055 | 10.08 |
| 2026-02-21 00:00 | 06:30:27.02 | -14:18:08.7 | HIP 30952 | 10.39 |
| 2026-02-21 12:00 | 06:30:16.36 | -14:15:30.9 | HIP 30952 | 9.49 |
| 2026-02-22 00:00 | 06:30:05.88 | -14:12:52.8 | HIP 30952 | 9.98 |
| 2026-02-22 12:00 | 06:29:55.58 | -14:10:14.4 | HIP 30910 | 9.97 |
| 2026-02-23 00:00 | 06:29:45.46 | -14:07:35.7 | HIP 30910 | 8.92 |
| 2026-02-23 12:00 | 06:29:35.52 | -14:04:56.9 | HIP 30910 | 9.29 |
| 2026-02-24 00:00 | 06:29:25.77 | -14:02:17.8 | HIP 30910 | 10.91 |