C/2022 E2 (ATLAS)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 E2 (ATLAS) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2024-09-14T03:08:24.480960Z |
| Orbit solution date (soln_date, UTC) | 2026-09-08T09:12:17Z |
| Obs used | 5845 |
| NEO | - |
| M1 | 7.900 |
| K1 | 6.500 |
| PC | 0.030 |
| Discovery observation (MPC, UTC) | 2022-03-07T02:52:22.339200Z |
| Discovery magnitude (MPC) | 18.76 c |
| 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) | 2024-08-25.0000000 |
| e | 1.00103521 |
| q (au) | 3.666296 |
| a (au) | -3541.583369 |
| i (deg) | 137.130397 |
| Ω (om, deg) | 125.374582 |
| ω (w, deg) | 41.723851 |
| M (ma, deg) | -0.000094 |
等級
散乱 + 全体線形
$$ M_a = (6.293 + 3.240\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 6.293 |
| n | 3.240 |
| gf | 1.000 |
| gb | -0.869 |
| k | 0.999 |
| 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 |
|---|---|---|---|
| 2022-02-23 | 2024-01-05 | +1.7020 | -1.669 |
| 2024-01-05 | 2024-09-14 | +6.1443 | -4.078 |
| 2024-09-15 | 2026-09-25 | +2.8765 | -1.774 |
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 | 22:03:54.33 | +27:00:56.5 | HIP 108904 | 5.50 |
| 2026-09-20 12:00 | 22:03:33.32 | +26:56:48.3 | HIP 108904 | 0.86 |
| 2026-09-21 00:00 | 22:03:12.45 | +26:52:39.2 | HIP 108904 | 7.01 |
| 2026-09-21 12:00 | 22:02:51.71 | +26:48:29.3 | HIP 108904 | 13.23 |
| 2026-09-22 00:00 | 22:02:31.12 | +26:44:18.7 | HIP 108700 | 18.62 |
| 2026-09-22 12:00 | 22:02:10.67 | +26:40:07.3 | HIP 108700 | 16.39 |
| 2026-09-23 00:00 | 22:01:50.36 | +26:35:55.2 | HIP 108746 | 13.34 |
| 2026-09-23 12:00 | 22:01:30.20 | +26:31:42.3 | HIP 108746 | 9.50 |
| 2026-09-24 00:00 | 22:01:10.18 | +26:27:28.8 | HIP 108746 | 8.86 |
| 2026-09-24 12:00 | 22:00:50.31 | +26:23:14.7 | HIP 108746 | 11.90 |
| 2026-09-25 00:00 | 22:00:30.59 | +26:19:00.0 | HIP 108578 | 12.92 |
| 2026-09-25 12:00 | 22:00:11.01 | +26:14:44.6 | HIP 108578 | 12.97 |
| 2026-09-26 00:00 | 21:59:51.59 | +26:10:28.6 | HIP 108578 | 15.63 |
| 2026-09-26 12:00 | 21:59:32.32 | +26:06:12.1 | HIP 108578 | 19.88 |
| 2026-09-27 00:00 | 21:59:13.21 | +26:01:55.1 | HIP 108578 | 24.90 |
| 2026-09-27 12:00 | 21:58:54.24 | +25:57:37.6 | HIP 108578 | 30.29 |
| 2026-09-28 00:00 | 21:58:35.44 | +25:53:19.5 | HIP 108578 | 35.89 |
| 2026-09-28 12:00 | 21:58:16.79 | +25:49:01.1 | HIP 108596 | 37.88 |
| 2026-09-29 00:00 | 21:57:58.29 | +25:44:42.1 | HIP 108221 | 35.76 |
| 2026-09-29 12:00 | 21:57:39.96 | +25:40:22.8 | HIP 108221 | 33.65 |
| 2026-09-30 00:00 | 21:57:21.78 | +25:36:03.1 | HIP 108221 | 32.55 |
| 2026-09-30 12:00 | 21:57:03.76 | +25:31:43.0 | HIP 108221 | 32.54 |
| 2026-10-01 00:00 | 21:56:45.91 | +25:27:22.6 | HIP 108221 | 33.61 |
| 2026-10-01 12:00 | 21:56:28.21 | +25:23:01.8 | HIP 108099 | 31.54 |
| 2026-10-02 00:00 | 21:56:10.68 | +25:18:40.8 | HIP 108099 | 28.29 |
| 2026-10-02 12:00 | 21:55:53.31 | +25:14:19.5 | HIP 108099 | 26.01 |
| 2026-10-03 00:00 | 21:55:36.11 | +25:09:57.9 | HIP 108099 | 24.96 |
| 2026-10-03 12:00 | 21:55:19.07 | +25:05:36.1 | HIP 108099 | 25.28 |
| 2026-10-04 00:00 | 21:55:02.20 | +25:01:14.1 | HIP 108099 | 26.90 |
| 2026-10-04 12:00 | 21:54:45.50 | +24:56:52.0 | HIP 107987 | 29.51 |
| 2026-10-05 00:00 | 21:54:28.96 | +24:52:29.7 | HIP 107987 | 27.29 |
| 2026-10-05 12:00 | 21:54:12.60 | +24:48:07.2 | HIP 107987 | 26.20 |
| 2026-10-06 00:00 | 21:53:56.40 | +24:43:44.6 | HIP 107987 | 26.37 |
| 2026-10-06 12:00 | 21:53:40.38 | +24:39:22.0 | HIP 107916 | 25.13 |
| 2026-10-07 00:00 | 21:53:24.52 | +24:34:59.3 | HIP 107916 | 22.31 |
| 2026-10-07 12:00 | 21:53:08.84 | +24:30:36.6 | HIP 107916 | 20.72 |
| 2026-10-08 00:00 | 21:52:53.33 | +24:26:13.8 | HIP 107916 | 20.63 |
| 2026-10-08 12:00 | 21:52:37.99 | +24:21:51.1 | HIP 107960 | 21.47 |
| 2026-10-09 00:00 | 21:52:22.82 | +24:17:28.4 | HIP 107960 | 16.74 |
| 2026-10-09 12:00 | 21:52:07.83 | +24:13:05.8 | HIP 107960 | 12.70 |
| 2026-10-10 00:00 | 21:51:53.02 | +24:08:43.2 | HIP 107960 | 10.17 |
| 2026-10-10 12:00 | 21:51:38.38 | +24:04:20.8 | HIP 107960 | 10.31 |
| 2026-10-11 00:00 | 21:51:23.92 | +23:59:58.4 | HIP 107960 | 12.99 |