C/2022 L2 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 L2 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-03-12T07:55:19.948800Z |
| Orbit solution date (soln_date, UTC) | 2026-04-05T22:49:47Z |
| Obs used | 2512 |
| 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) | 2023-04-29.0000000 |
| e | 1.00133386 |
| q (au) | 2.692315 |
| a (au) | -2018.432959 |
| i (deg) | 129.313595 |
| Ω (om, deg) | 39.242589 |
| ω (w, deg) | 199.942117 |
| M (ma, deg) | -0.003460 |
等級
散乱 + 全体線形
$$ M_a = (12.983 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.983 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.692 |
| 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 | +2.2035 | -1.845 |
| 2023-05-24 | 2024-03-12 | -0.5853 | +0.086 |
| 2024-03-13 | 2025-12-27 | +1.7609 | -0.637 |
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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 05:10:50.15 | -11:32:24.7 | HIP 24099 | 7.60 |
| 2026-05-12 12:00 | 05:10:59.38 | -11:30:45.9 | HIP 24099 | 10.23 |
| 2026-05-13 00:00 | 05:11:08.64 | -11:29:08.1 | HIP 24099 | 12.93 |
| 2026-05-13 12:00 | 05:11:17.94 | -11:27:31.3 | HIP 24099 | 15.65 |
| 2026-05-14 00:00 | 05:11:27.28 | -11:25:55.5 | HIP 24099 | 18.39 |
| 2026-05-14 12:00 | 05:11:36.66 | -11:24:20.7 | HIP 24099 | 21.14 |
| 2026-05-15 00:00 | 05:11:46.08 | -11:22:46.8 | HIP 24099 | 23.90 |
| 2026-05-15 12:00 | 05:11:55.53 | -11:21:13.9 | HIP 24212 | 23.58 |
| 2026-05-16 00:00 | 05:12:05.01 | -11:19:42.0 | HIP 24212 | 22.12 |
| 2026-05-16 12:00 | 05:12:14.53 | -11:18:11.1 | HIP 24212 | 20.96 |
| 2026-05-17 00:00 | 05:12:24.08 | -11:16:41.2 | HIP 24212 | 20.13 |
| 2026-05-17 12:00 | 05:12:33.66 | -11:15:12.3 | HIP 24212 | 19.68 |
| 2026-05-18 00:00 | 05:12:43.28 | -11:13:44.4 | HIP 24212 | 19.64 |
| 2026-05-18 12:00 | 05:12:52.92 | -11:12:17.4 | HIP 24212 | 20.01 |
| 2026-05-19 00:00 | 05:13:02.59 | -11:10:51.5 | HIP 24212 | 20.76 |
| 2026-05-19 12:00 | 05:13:12.30 | -11:09:26.5 | HIP 24212 | 21.85 |
| 2026-05-20 00:00 | 05:13:22.02 | -11:08:02.5 | HIP 24212 | 23.24 |
| 2026-05-20 12:00 | 05:13:31.78 | -11:06:39.5 | HIP 24212 | 24.87 |
| 2026-05-21 00:00 | 05:13:41.56 | -11:05:17.5 | HIP 24212 | 26.70 |
| 2026-05-21 12:00 | 05:13:51.37 | -11:03:56.5 | HIP 24212 | 28.69 |
| 2026-05-22 00:00 | 05:14:01.19 | -11:02:36.4 | HIP 24212 | 30.80 |
| 2026-05-22 12:00 | 05:14:11.05 | -11:01:17.4 | HIP 24212 | 33.02 |
| 2026-05-23 00:00 | 05:14:20.92 | -10:59:59.3 | HIP 24560 | 34.22 |
| 2026-05-23 12:00 | 05:14:30.82 | -10:58:42.2 | HIP 24560 | 33.20 |
| 2026-05-24 00:00 | 05:14:40.74 | -10:57:26.1 | HIP 24560 | 32.37 |
| 2026-05-24 12:00 | 05:14:50.67 | -10:56:10.9 | HIP 24425 | 31.69 |
| 2026-05-25 00:00 | 05:15:00.63 | -10:54:56.8 | HIP 24425 | 31.02 |
| 2026-05-25 12:00 | 05:15:10.60 | -10:53:43.6 | HIP 24425 | 30.60 |
| 2026-05-26 00:00 | 05:15:20.59 | -10:52:31.4 | HIP 24425 | 30.44 |
| 2026-05-26 12:00 | 05:15:30.60 | -10:51:20.2 | HIP 24425 | 30.54 |
| 2026-05-27 00:00 | 05:15:40.63 | -10:50:09.9 | HIP 24425 | 30.90 |
| 2026-05-27 12:00 | 05:15:50.67 | -10:49:00.6 | HIP 24687 | 29.38 |
| 2026-05-28 00:00 | 05:16:00.72 | -10:47:52.3 | HIP 24687 | 27.49 |
| 2026-05-28 12:00 | 05:16:10.79 | -10:46:45.0 | HIP 24687 | 25.74 |
| 2026-05-29 00:00 | 05:16:20.87 | -10:45:38.6 | HIP 24687 | 24.17 |
| 2026-05-29 12:00 | 05:16:30.96 | -10:44:33.3 | HIP 24687 | 22.79 |
| 2026-05-30 00:00 | 05:16:41.07 | -10:43:28.8 | HIP 24687 | 21.65 |
| 2026-05-30 12:00 | 05:16:51.19 | -10:42:25.4 | HIP 24687 | 20.79 |
| 2026-05-31 00:00 | 05:17:01.31 | -10:41:22.9 | HIP 24687 | 20.24 |
| 2026-05-31 12:00 | 05:17:11.45 | -10:40:21.4 | HIP 24687 | 20.02 |
| 2026-06-01 00:00 | 05:17:21.60 | -10:39:20.8 | HIP 24687 | 20.15 |
| 2026-06-01 12:00 | 05:17:31.75 | -10:38:21.2 | HIP 24773 | 18.84 |
| 2026-06-02 00:00 | 05:17:41.91 | -10:37:22.6 | HIP 24773 | 16.17 |