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 | +4.1828 | -0.918 |
| 2023-03-14 | 2024-02-07 | +4.6483 | -1.570 |
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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 01:46:08.62 | -55:36:55.4 | HIP 8193 | 30.33 |
| 2026-03-26 12:00 | 01:46:21.80 | -55:35:43.7 | HIP 8193 | 31.95 |
| 2026-03-27 00:00 | 01:46:35.02 | -55:34:32.9 | HIP 8193 | 33.62 |
| 2026-03-27 12:00 | 01:46:48.28 | -55:33:23.1 | HIP 8193 | 35.33 |
| 2026-03-28 00:00 | 01:47:01.57 | -55:32:14.3 | HIP 8193 | 37.09 |
| 2026-03-28 12:00 | 01:47:14.90 | -55:31:06.5 | HIP 8193 | 38.87 |
| 2026-03-29 00:00 | 01:47:28.26 | -55:29:59.7 | HIP 8193 | 40.69 |
| 2026-03-29 12:00 | 01:47:41.66 | -55:28:53.8 | HIP 8711 | 40.91 |
| 2026-03-30 00:00 | 01:47:55.09 | -55:27:49.0 | HIP 8711 | 39.66 |
| 2026-03-30 12:00 | 01:48:08.55 | -55:26:45.1 | HIP 8711 | 38.49 |
| 2026-03-31 00:00 | 01:48:22.04 | -55:25:42.3 | HIP 8711 | 37.39 |
| 2026-03-31 12:00 | 01:48:35.57 | -55:24:40.4 | HIP 8711 | 36.38 |
| 2026-04-01 00:00 | 01:48:49.12 | -55:23:39.6 | HIP 8711 | 35.45 |
| 2026-04-01 12:00 | 01:49:02.70 | -55:22:39.7 | HIP 8687 | 33.97 |
| 2026-04-02 00:00 | 01:49:16.31 | -55:21:40.8 | HIP 8687 | 31.93 |
| 2026-04-02 12:00 | 01:49:29.94 | -55:20:43.0 | HIP 8687 | 29.93 |
| 2026-04-03 00:00 | 01:49:43.60 | -55:19:46.2 | HIP 8687 | 27.96 |
| 2026-04-03 12:00 | 01:49:57.29 | -55:18:50.3 | HIP 8687 | 26.03 |
| 2026-04-04 00:00 | 01:50:11.00 | -55:17:55.5 | HIP 8687 | 24.15 |
| 2026-04-04 12:00 | 01:50:24.74 | -55:17:01.7 | HIP 8687 | 22.33 |
| 2026-04-05 00:00 | 01:50:38.50 | -55:16:08.9 | HIP 8687 | 20.60 |
| 2026-04-05 12:00 | 01:50:52.29 | -55:15:17.2 | HIP 8687 | 18.96 |
| 2026-04-06 00:00 | 01:51:06.09 | -55:14:26.5 | HIP 8687 | 17.45 |
| 2026-04-06 12:00 | 01:51:19.92 | -55:13:36.8 | HIP 8687 | 16.10 |
| 2026-04-07 00:00 | 01:51:33.77 | -55:12:48.1 | HIP 8687 | 14.95 |
| 2026-04-07 12:00 | 01:51:47.63 | -55:12:00.4 | HIP 8687 | 14.06 |
| 2026-04-08 00:00 | 01:52:01.52 | -55:11:13.8 | HIP 8687 | 13.47 |
| 2026-04-08 12:00 | 01:52:15.42 | -55:10:28.2 | HIP 8687 | 13.21 |
| 2026-04-09 00:00 | 01:52:29.34 | -55:09:43.7 | HIP 8687 | 13.32 |
| 2026-04-09 12:00 | 01:52:43.28 | -55:09:00.2 | HIP 8687 | 13.77 |
| 2026-04-10 00:00 | 01:52:57.24 | -55:08:17.8 | HIP 8687 | 14.54 |
| 2026-04-10 12:00 | 01:53:11.21 | -55:07:36.4 | HIP 8687 | 15.57 |
| 2026-04-11 00:00 | 01:53:25.19 | -55:06:56.0 | HIP 8687 | 16.82 |
| 2026-04-11 12:00 | 01:53:39.19 | -55:06:16.7 | HIP 8687 | 18.24 |
| 2026-04-12 00:00 | 01:53:53.20 | -55:05:38.4 | HIP 8985 | 16.51 |
| 2026-04-12 12:00 | 01:54:07.22 | -55:05:01.3 | HIP 8985 | 14.47 |
| 2026-04-13 00:00 | 01:54:21.25 | -55:04:25.1 | HIP 8985 | 12.45 |
| 2026-04-13 12:00 | 01:54:35.30 | -55:03:50.0 | HIP 8985 | 10.45 |
| 2026-04-14 00:00 | 01:54:49.35 | -55:03:16.0 | HIP 8985 | 8.49 |
| 2026-04-14 12:00 | 01:55:03.42 | -55:02:43.1 | HIP 8985 | 6.61 |
| 2026-04-15 00:00 | 01:55:17.49 | -55:02:11.2 | HIP 8985 | 4.89 |
| 2026-04-15 12:00 | 01:55:31.56 | -55:01:40.4 | HIP 8985 | 3.57 |
| 2026-04-16 00:00 | 01:55:45.65 | -55:01:10.7 | HIP 8985 | 3.17 |