C/2022 L2 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 L2 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-03-12T07:34:07.993920Z |
| Orbit solution date (soln_date, UTC) | 2026-01-07T15:42:41Z |
| Obs used | 3094 |
| NEO | - |
| M1 | 11.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2022-06-10T11:24:34.041600Z |
| Discovery magnitude (MPC) | 18.43 o |
| Discovery observatory (MPC) | T08 · ATLAS-MLO, Mauna Loa |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2023-07-15.0000000 |
| e | 1.00138628 |
| q (au) | 2.692466 |
| a (au) | -1942.217821 |
| i (deg) | 129.314115 |
| Ω (om, deg) | 39.241884 |
| ω (w, deg) | 199.936102 |
| M (ma, deg) | -0.002779 |
等級
散乱 + 全体線形
$$ M_a = (13.010 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 13.010 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.696 |
| 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 |
|---|---|---|---|
| 2022-05-20 | 2023-05-24 | +2.2325 | -1.858 |
| 2023-05-24 | 2024-03-12 | -0.5099 | +0.046 |
| 2024-03-13 | 2024-09-04 | -4.0241 | +1.921 |
| 2024-09-04 | 2025-05-07 | +3.7291 | -1.873 |
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 | 05:12:41.56 | -21:07:07.7 | HIP 24112 | 35.41 |
| 2026-02-03 12:00 | 05:12:25.60 | -21:03:42.8 | HIP 24112 | 30.37 |
| 2026-02-04 00:00 | 05:12:09.84 | -21:00:17.4 | HIP 24112 | 25.37 |
| 2026-02-04 12:00 | 05:11:54.27 | -20:56:51.4 | HIP 24112 | 20.40 |
| 2026-02-05 00:00 | 05:11:38.90 | -20:53:24.9 | HIP 24112 | 15.49 |
| 2026-02-05 12:00 | 05:11:23.73 | -20:49:57.8 | HIP 24112 | 10.68 |
| 2026-02-06 00:00 | 05:11:08.75 | -20:46:30.2 | HIP 24112 | 6.12 |
| 2026-02-06 12:00 | 05:10:53.98 | -20:43:02.1 | HIP 24112 | 3.08 |
| 2026-02-07 00:00 | 05:10:39.39 | -20:39:33.6 | HIP 24112 | 5.43 |
| 2026-02-07 12:00 | 05:10:25.01 | -20:36:04.6 | HIP 24112 | 9.83 |
| 2026-02-08 00:00 | 05:10:10.82 | -20:32:35.2 | HIP 120001 | 14.49 |
| 2026-02-08 12:00 | 05:09:56.83 | -20:29:05.4 | HIP 120001 | 19.20 |
| 2026-02-09 00:00 | 05:09:43.04 | -20:25:35.2 | HIP 24086 | 22.57 |
| 2026-02-09 12:00 | 05:09:29.44 | -20:22:04.7 | HIP 24086 | 21.41 |
| 2026-02-10 00:00 | 05:09:16.05 | -20:18:33.7 | HIP 23888 | 21.05 |
| 2026-02-10 12:00 | 05:09:02.84 | -20:15:02.5 | HIP 23888 | 16.60 |
| 2026-02-11 00:00 | 05:08:49.84 | -20:11:30.9 | HIP 23888 | 12.37 |
| 2026-02-11 12:00 | 05:08:37.03 | -20:07:59.0 | HIP 23888 | 8.64 |
| 2026-02-12 00:00 | 05:08:24.41 | -20:04:26.9 | HIP 23888 | 6.32 |
| 2026-02-12 12:00 | 05:08:12.00 | -20:00:54.5 | HIP 23888 | 6.92 |
| 2026-02-13 00:00 | 05:07:59.77 | -19:57:21.8 | HIP 23888 | 9.90 |
| 2026-02-13 12:00 | 05:07:47.75 | -19:53:48.9 | HIP 23888 | 13.77 |
| 2026-02-14 00:00 | 05:07:35.92 | -19:50:15.9 | HIP 23888 | 17.94 |
| 2026-02-14 12:00 | 05:07:24.28 | -19:46:42.6 | HIP 23806 | 20.99 |
| 2026-02-15 00:00 | 05:07:12.84 | -19:43:09.2 | HIP 23818 | 19.61 |
| 2026-02-15 12:00 | 05:07:01.59 | -19:39:35.6 | HIP 23818 | 16.16 |
| 2026-02-16 00:00 | 05:06:50.54 | -19:36:01.8 | HIP 23818 | 13.28 |
| 2026-02-16 12:00 | 05:06:39.68 | -19:32:28.0 | HIP 23818 | 11.39 |
| 2026-02-17 00:00 | 05:06:29.01 | -19:28:54.1 | HIP 23818 | 11.00 |
| 2026-02-17 12:00 | 05:06:18.54 | -19:25:20.1 | HIP 23818 | 12.21 |
| 2026-02-18 00:00 | 05:06:08.26 | -19:21:46.0 | HIP 23818 | 14.62 |
| 2026-02-18 12:00 | 05:05:58.17 | -19:18:11.9 | HIP 23818 | 17.72 |
| 2026-02-19 00:00 | 05:05:48.27 | -19:14:37.7 | HIP 23818 | 21.20 |
| 2026-02-19 12:00 | 05:05:38.56 | -19:11:03.6 | HIP 23818 | 24.89 |
| 2026-02-20 00:00 | 05:05:29.04 | -19:07:29.4 | HIP 23818 | 28.69 |
| 2026-02-20 12:00 | 05:05:19.72 | -19:03:55.3 | HIP 23848 | 32.44 |
| 2026-02-21 00:00 | 05:05:10.58 | -19:00:21.2 | HIP 23848 | 34.60 |
| 2026-02-21 12:00 | 05:05:01.62 | -18:56:47.2 | HIP 23848 | 37.06 |
| 2026-02-22 00:00 | 05:04:52.86 | -18:53:13.3 | HIP 23848 | 39.76 |
| 2026-02-22 12:00 | 05:04:44.28 | -18:49:39.4 | HIP 23456 | 38.12 |
| 2026-02-23 00:00 | 05:04:35.89 | -18:46:05.7 | HIP 23456 | 34.54 |
| 2026-02-23 12:00 | 05:04:27.68 | -18:42:32.1 | HIP 23456 | 31.12 |
| 2026-02-24 00:00 | 05:04:19.66 | -18:38:58.6 | HIP 23456 | 27.92 |