C/2024 G3 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2024 G3 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2025-01-13T10:11:01.593600Z |
| Orbit solution date (soln_date, UTC) | 2025-04-11T14:44:56Z |
| Obs used | 299 |
| NEO | - |
| M1 | 7.600 |
| K1 | 12.500 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2024-04-05T06:19:43.334400Z |
| Discovery magnitude (MPC) | 19.21 o |
| 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) | 2024-06-19.0000000 |
| e | 1.00001229 |
| q (au) | 0.093493 |
| a (au) | -7606.453070 |
| i (deg) | 116.851095 |
| Ω (om, deg) | 220.332091 |
| ω (w, deg) | 108.125373 |
| M (ma, deg) | -0.000310 |
等級
散乱 + 全体線形
$$ M_a = (8.414 + 4.556\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 8.414 |
| n | 4.556 |
| gf | 0.800 |
| gb | -0.506 |
| k | 0.800 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2024-04-05 | 2025-01-03 | +1.9192 | -0.824 |
| 2025-01-03 | 2025-01-11 | -4.0733 | -3.425 |
| 2025-01-11 | 2025-01-13 | -1.4868 | -1.082 |
| 2025-01-13 | 2025-05-20 | -2.4763 | -2.598 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 02:06:22.20 | -79:50:04.6 | HIP 9711 | 18.21 |
| 2026-07-29 12:00 | 02:06:11.58 | -79:54:27.5 | HIP 9711 | 22.43 |
| 2026-07-30 00:00 | 02:06:00.06 | -79:58:49.9 | HIP 9711 | 26.70 |
| 2026-07-30 12:00 | 02:05:47.63 | -80:03:11.7 | HIP 9711 | 31.00 |
| 2026-07-31 00:00 | 02:05:34.28 | -80:07:33.0 | HIP 9400 | 27.20 |
| 2026-07-31 12:00 | 02:05:19.98 | -80:11:53.8 | HIP 9400 | 23.06 |
| 2026-08-01 00:00 | 02:05:04.71 | -80:16:13.9 | HIP 9400 | 19.02 |
| 2026-08-01 12:00 | 02:04:48.47 | -80:20:33.4 | HIP 9400 | 15.16 |
| 2026-08-02 00:00 | 02:04:31.22 | -80:24:52.2 | HIP 9400 | 11.65 |
| 2026-08-02 12:00 | 02:04:12.95 | -80:29:10.3 | HIP 9400 | 8.91 |
| 2026-08-03 00:00 | 02:03:53.64 | -80:33:27.8 | HIP 9400 | 7.80 |
| 2026-08-03 12:00 | 02:03:33.27 | -80:37:44.5 | HIP 9400 | 8.92 |
| 2026-08-04 00:00 | 02:03:11.81 | -80:42:00.4 | HIP 9400 | 11.66 |
| 2026-08-04 12:00 | 02:02:49.26 | -80:46:15.5 | HIP 9400 | 15.15 |
| 2026-08-05 00:00 | 02:02:25.58 | -80:50:29.8 | HIP 9400 | 18.97 |
| 2026-08-05 12:00 | 02:02:00.75 | -80:54:43.2 | HIP 9400 | 22.97 |
| 2026-08-06 00:00 | 02:01:34.76 | -80:58:55.8 | HIP 8701 | 22.68 |
| 2026-08-06 12:00 | 02:01:07.57 | -81:03:07.4 | HIP 8701 | 21.51 |
| 2026-08-07 00:00 | 02:00:39.18 | -81:07:18.1 | HIP 8701 | 21.15 |
| 2026-08-07 12:00 | 02:00:09.54 | -81:11:27.8 | HIP 9052 | 20.14 |
| 2026-08-08 00:00 | 01:59:38.65 | -81:15:36.4 | HIP 9052 | 15.87 |
| 2026-08-08 12:00 | 01:59:06.47 | -81:19:44.1 | HIP 9052 | 11.64 |
| 2026-08-09 00:00 | 01:58:32.99 | -81:23:50.6 | HIP 9052 | 7.47 |
| 2026-08-09 12:00 | 01:57:58.17 | -81:27:56.0 | HIP 9052 | 3.61 |
| 2026-08-10 00:00 | 01:57:21.99 | -81:32:00.2 | HIP 9052 | 2.62 |
| 2026-08-10 12:00 | 01:56:44.43 | -81:36:03.3 | HIP 9052 | 6.10 |
| 2026-08-11 00:00 | 01:56:05.46 | -81:40:05.0 | HIP 9052 | 10.19 |
| 2026-08-11 12:00 | 01:55:25.07 | -81:44:05.6 | HIP 9052 | 14.38 |
| 2026-08-12 00:00 | 01:54:43.21 | -81:48:04.8 | HIP 9052 | 18.59 |
| 2026-08-12 12:00 | 01:53:59.87 | -81:52:02.6 | HIP 9052 | 22.81 |
| 2026-08-13 00:00 | 01:53:15.02 | -81:55:59.0 | HIP 9191 | 24.07 |
| 2026-08-13 12:00 | 01:52:28.63 | -81:59:54.0 | HIP 9191 | 21.44 |
| 2026-08-14 00:00 | 01:51:40.68 | -82:03:47.5 | HIP 9191 | 19.42 |
| 2026-08-14 12:00 | 01:50:51.15 | -82:07:39.5 | HIP 8374 | 17.76 |
| 2026-08-15 00:00 | 01:50:00.00 | -82:11:29.9 | HIP 8374 | 13.56 |
| 2026-08-15 12:00 | 01:49:07.22 | -82:15:18.7 | HIP 8374 | 9.39 |
| 2026-08-16 00:00 | 01:48:12.77 | -82:19:05.9 | HIP 8374 | 5.31 |
| 2026-08-16 12:00 | 01:47:16.64 | -82:22:51.3 | HIP 8374 | 1.91 |
| 2026-08-17 00:00 | 01:46:18.78 | -82:26:35.0 | HIP 8374 | 3.79 |
| 2026-08-17 12:00 | 01:45:19.19 | -82:30:16.9 | HIP 8374 | 7.76 |
| 2026-08-18 00:00 | 01:44:17.83 | -82:33:56.9 | HIP 8291 | 8.06 |
| 2026-08-18 12:00 | 01:43:14.67 | -82:37:35.1 | HIP 8291 | 7.41 |
| 2026-08-19 00:00 | 01:42:09.70 | -82:41:11.3 | HIP 8291 | 8.95 |