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
$$ M_a = (12.967 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 12.967 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.690 |
| 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 | +2.1870 | -1.838 |
| 2023-05-24 | 2024-03-12 | -0.6286 | +0.108 |
| 2024-03-13 | 2026-02-06 | +2.0535 | -0.781 |
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) |
|---|---|---|---|---|
| 2026-09-20 00:00 | 05:37:05.71 | -12:37:02.6 | HIP 26440 | 8.63 |
| 2026-09-20 12:00 | 05:37:00.93 | -12:38:36.2 | HIP 26440 | 8.92 |
| 2026-09-21 00:00 | 05:36:56.02 | -12:40:09.9 | HIP 26440 | 9.63 |
| 2026-09-21 12:00 | 05:36:50.99 | -12:41:43.6 | HIP 26440 | 10.69 |
| 2026-09-22 00:00 | 05:36:45.82 | -12:43:17.5 | HIP 26440 | 12.02 |
| 2026-09-22 12:00 | 05:36:40.53 | -12:44:51.3 | HIP 26440 | 13.55 |
| 2026-09-23 00:00 | 05:36:35.11 | -12:46:25.3 | HIP 26440 | 15.23 |
| 2026-09-23 12:00 | 05:36:29.57 | -12:47:59.2 | HIP 26440 | 17.02 |
| 2026-09-24 00:00 | 05:36:23.89 | -12:49:33.2 | HIP 26440 | 18.89 |
| 2026-09-24 12:00 | 05:36:18.09 | -12:51:07.2 | HIP 26440 | 20.83 |
| 2026-09-25 00:00 | 05:36:12.16 | -12:52:41.3 | HIP 26288 | 22.48 |
| 2026-09-25 12:00 | 05:36:06.10 | -12:54:15.3 | HIP 26288 | 20.68 |
| 2026-09-26 00:00 | 05:35:59.91 | -12:55:49.3 | HIP 26288 | 18.95 |
| 2026-09-26 12:00 | 05:35:53.59 | -12:57:23.3 | HIP 26288 | 17.32 |
| 2026-09-27 00:00 | 05:35:47.15 | -12:58:57.2 | HIP 26288 | 15.83 |
| 2026-09-27 12:00 | 05:35:40.58 | -13:00:31.2 | HIP 26288 | 14.53 |
| 2026-09-28 00:00 | 05:35:33.87 | -13:02:05.1 | HIP 26288 | 13.50 |
| 2026-09-28 12:00 | 05:35:27.04 | -13:03:38.9 | HIP 26288 | 12.80 |
| 2026-09-29 00:00 | 05:35:20.09 | -13:05:12.6 | HIP 26288 | 12.51 |
| 2026-09-29 12:00 | 05:35:13.00 | -13:06:46.3 | HIP 26288 | 12.66 |
| 2026-09-30 00:00 | 05:35:05.78 | -13:08:19.9 | HIP 26288 | 13.26 |
| 2026-09-30 12:00 | 05:34:58.44 | -13:09:53.4 | HIP 26288 | 14.25 |
| 2026-10-01 00:00 | 05:34:50.96 | -13:11:26.8 | HIP 26288 | 15.58 |
| 2026-10-01 12:00 | 05:34:43.36 | -13:13:00.1 | HIP 26288 | 17.17 |
| 2026-10-02 00:00 | 05:34:35.63 | -13:14:33.3 | HIP 26288 | 18.96 |
| 2026-10-02 12:00 | 05:34:27.77 | -13:16:06.3 | HIP 26074 | 19.66 |
| 2026-10-03 00:00 | 05:34:19.78 | -13:17:39.2 | HIP 26074 | 17.28 |
| 2026-10-03 12:00 | 05:34:11.66 | -13:19:11.9 | HIP 26074 | 14.91 |
| 2026-10-04 00:00 | 05:34:03.42 | -13:20:44.4 | HIP 26074 | 12.58 |
| 2026-10-04 12:00 | 05:33:55.04 | -13:22:16.8 | HIP 26074 | 10.34 |
| 2026-10-05 00:00 | 05:33:46.54 | -13:23:49.0 | HIP 26074 | 8.27 |
| 2026-10-05 12:00 | 05:33:37.91 | -13:25:20.9 | HIP 26074 | 6.59 |
| 2026-10-06 00:00 | 05:33:29.14 | -13:26:52.7 | HIP 26074 | 5.66 |
| 2026-10-06 12:00 | 05:33:20.25 | -13:28:24.2 | HIP 26074 | 5.89 |
| 2026-10-07 00:00 | 05:33:11.24 | -13:29:55.5 | HIP 26074 | 7.20 |
| 2026-10-07 12:00 | 05:33:02.09 | -13:31:26.6 | HIP 26074 | 9.16 |
| 2026-10-08 00:00 | 05:32:52.82 | -13:32:57.3 | HIP 26074 | 11.45 |
| 2026-10-08 12:00 | 05:32:43.42 | -13:34:27.8 | HIP 26074 | 13.92 |
| 2026-10-09 00:00 | 05:32:33.89 | -13:35:58.1 | HIP 26074 | 16.50 |
| 2026-10-09 12:00 | 05:32:24.23 | -13:37:28.0 | HIP 26074 | 19.16 |
| 2026-10-10 00:00 | 05:32:14.45 | -13:38:57.6 | HIP 25829 | 20.55 |
| 2026-10-10 12:00 | 05:32:04.54 | -13:40:26.9 | HIP 25829 | 17.87 |
| 2026-10-11 00:00 | 05:31:54.50 | -13:41:55.8 | HIP 25829 | 15.21 |