C/2022 E3 (ZTF)
メタデータ
| 項目 | 値 |
|---|---|
| Designation | C/2022 E3 (ZTF) |
| Type | C |
| Perihelion (tp_cal, UTC) | 2023-01-12T18:50:41.176320Z |
| Orbit solution date (soln_date, UTC) | 2025-07-31T12:12:23Z |
| Obs used | 5330 |
| NEO | - |
| M1 | 10.800 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2022-03-02T13:04:07.392000Z |
| Discovery magnitude (MPC) | 17.29 r |
| Discovery observatory (MPC) | I41 · Palomar Mountain–ZTF |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2022-10-21.0000000 |
| e | 1.00030191 |
| q (au) | 1.112244 |
| a (au) | -3684.077283 |
| i (deg) | 109.169481 |
| Ω (om, deg) | 302.555020 |
| ω (w, deg) | 145.814929 |
| M (ma, deg) | -0.000369 |
等級
散乱 + 全体線形
$$ M_a = (10.745 + 2.944\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 10.745 |
| n | 2.944 |
| gf | 1.000 |
| gb | -0.681 |
| 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 |
|---|---|---|---|
| 2021-07-10 | 2023-01-12 | +2.7726 | -1.340 |
| 2023-01-13 | 2023-03-14 | +4.1829 | -0.918 |
| 2023-03-14 | 2024-02-07 | +4.6483 | -1.569 |
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) |
|---|---|---|---|---|
| 2026-06-01 00:00 | 02:16:02.56 | -55:32:49.2 | HIP 10583 | 3.52 |
| 2026-06-01 12:00 | 02:16:13.80 | -55:33:59.1 | HIP 10583 | 4.37 |
| 2026-06-02 00:00 | 02:16:24.99 | -55:35:10.1 | HIP 10583 | 5.81 |
| 2026-06-02 12:00 | 02:16:36.10 | -55:36:22.0 | HIP 10583 | 7.51 |
| 2026-06-03 00:00 | 02:16:47.15 | -55:37:34.9 | HIP 10583 | 9.33 |
| 2026-06-03 12:00 | 02:16:58.13 | -55:38:48.8 | HIP 10583 | 11.21 |
| 2026-06-04 00:00 | 02:17:09.04 | -55:40:03.7 | HIP 10583 | 13.12 |
| 2026-06-04 12:00 | 02:17:19.88 | -55:41:19.6 | HIP 10583 | 15.06 |
| 2026-06-05 00:00 | 02:17:30.64 | -55:42:36.5 | HIP 10583 | 17.01 |
| 2026-06-05 12:00 | 02:17:41.34 | -55:43:54.3 | HIP 10583 | 18.98 |
| 2026-06-06 00:00 | 02:17:51.96 | -55:45:13.1 | HIP 10871 | 20.64 |
| 2026-06-06 12:00 | 02:18:02.51 | -55:46:32.9 | HIP 10871 | 18.67 |
| 2026-06-07 00:00 | 02:18:12.99 | -55:47:53.6 | HIP 10871 | 16.71 |
| 2026-06-07 12:00 | 02:18:23.39 | -55:49:15.3 | HIP 10871 | 14.75 |
| 2026-06-08 00:00 | 02:18:33.71 | -55:50:38.0 | HIP 10871 | 12.81 |
| 2026-06-08 12:00 | 02:18:43.96 | -55:52:01.6 | HIP 10871 | 10.90 |
| 2026-06-09 00:00 | 02:18:54.12 | -55:53:26.2 | HIP 10871 | 9.03 |
| 2026-06-09 12:00 | 02:19:04.21 | -55:54:51.8 | HIP 10871 | 7.24 |
| 2026-06-10 00:00 | 02:19:14.23 | -55:56:18.2 | HIP 10871 | 5.62 |
| 2026-06-10 12:00 | 02:19:24.16 | -55:57:45.7 | HIP 10871 | 4.35 |
| 2026-06-11 00:00 | 02:19:34.00 | -55:59:14.0 | HIP 10871 | 3.81 |
| 2026-06-11 12:00 | 02:19:43.77 | -56:00:43.3 | HIP 10871 | 4.29 |
| 2026-06-12 00:00 | 02:19:53.45 | -56:02:13.6 | HIP 10897 | 4.77 |
| 2026-06-12 12:00 | 02:20:03.05 | -56:03:44.7 | HIP 10897 | 2.74 |
| 2026-06-13 00:00 | 02:20:12.57 | -56:05:16.8 | HIP 10897 | 0.72 |
| 2026-06-13 12:00 | 02:20:21.99 | -56:06:49.8 | HIP 10897 | 1.32 |
| 2026-06-14 00:00 | 02:20:31.34 | -56:08:23.7 | HIP 10897 | 3.35 |
| 2026-06-14 12:00 | 02:20:40.59 | -56:09:58.6 | HIP 10897 | 5.39 |
| 2026-06-15 00:00 | 02:20:49.75 | -56:11:34.3 | HIP 10897 | 7.43 |
| 2026-06-15 12:00 | 02:20:58.83 | -56:13:10.9 | HIP 10897 | 9.48 |
| 2026-06-16 00:00 | 02:21:07.81 | -56:14:48.5 | HIP 10897 | 11.53 |
| 2026-06-16 12:00 | 02:21:16.70 | -56:16:26.9 | HIP 10897 | 13.58 |
| 2026-06-17 00:00 | 02:21:25.50 | -56:18:06.2 | HIP 10897 | 15.63 |
| 2026-06-17 12:00 | 02:21:34.21 | -56:19:46.3 | HIP 10897 | 17.69 |
| 2026-06-18 00:00 | 02:21:42.82 | -56:21:27.3 | HIP 11123 | 16.37 |
| 2026-06-18 12:00 | 02:21:51.33 | -56:23:09.2 | HIP 11123 | 14.35 |
| 2026-06-19 00:00 | 02:21:59.75 | -56:24:52.0 | HIP 11123 | 12.35 |
| 2026-06-19 12:00 | 02:22:08.08 | -56:26:35.6 | HIP 11123 | 10.39 |
| 2026-06-20 00:00 | 02:22:16.30 | -56:28:20.0 | HIP 11123 | 8.48 |
| 2026-06-20 12:00 | 02:22:24.43 | -56:30:05.3 | HIP 11123 | 6.68 |
| 2026-06-21 00:00 | 02:22:32.46 | -56:31:51.4 | HIP 11123 | 5.11 |
| 2026-06-21 12:00 | 02:22:40.39 | -56:33:38.3 | HIP 11123 | 4.07 |
| 2026-06-22 00:00 | 02:22:48.21 | -56:35:26.0 | HIP 11123 | 3.98 |