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) |
|---|---|---|---|---|
| 2026-07-29 00:00 | 02:26:50.18 | -59:17:37.6 | HIP 11727 | 36.02 |
| 2026-07-29 12:00 | 02:26:48.11 | -59:20:04.5 | HIP 11727 | 36.92 |
| 2026-07-30 00:00 | 02:26:45.89 | -59:22:31.6 | HIP 11727 | 37.98 |
| 2026-07-30 12:00 | 02:26:43.51 | -59:24:58.8 | HIP 11727 | 39.18 |
| 2026-07-31 00:00 | 02:26:40.96 | -59:27:26.2 | HIP 11044 | 38.56 |
| 2026-07-31 12:00 | 02:26:38.25 | -59:29:53.7 | HIP 11044 | 37.14 |
| 2026-08-01 00:00 | 02:26:35.38 | -59:32:21.3 | HIP 11044 | 35.81 |
| 2026-08-01 12:00 | 02:26:32.35 | -59:34:49.0 | HIP 11044 | 34.59 |
| 2026-08-02 00:00 | 02:26:29.15 | -59:37:16.8 | HIP 11044 | 33.50 |
| 2026-08-02 12:00 | 02:26:25.79 | -59:39:44.6 | HIP 11044 | 32.54 |
| 2026-08-03 00:00 | 02:26:22.26 | -59:42:12.6 | HIP 11044 | 31.73 |
| 2026-08-03 12:00 | 02:26:18.56 | -59:44:40.6 | HIP 11044 | 31.08 |
| 2026-08-04 00:00 | 02:26:14.70 | -59:47:08.6 | HIP 11044 | 30.60 |
| 2026-08-04 12:00 | 02:26:10.68 | -59:49:36.7 | HIP 11044 | 30.31 |
| 2026-08-05 00:00 | 02:26:06.48 | -59:52:04.7 | HIP 11258 | 28.11 |
| 2026-08-05 12:00 | 02:26:02.12 | -59:54:32.8 | HIP 11258 | 25.60 |
| 2026-08-06 00:00 | 02:25:57.58 | -59:57:00.9 | HIP 11258 | 23.08 |
| 2026-08-06 12:00 | 02:25:52.88 | -59:59:29.0 | HIP 11258 | 20.56 |
| 2026-08-07 00:00 | 02:25:48.01 | -60:01:57.0 | HIP 11258 | 18.04 |
| 2026-08-07 12:00 | 02:25:42.97 | -60:04:25.0 | HIP 11258 | 15.52 |
| 2026-08-08 00:00 | 02:25:37.75 | -60:06:53.0 | HIP 11258 | 13.00 |
| 2026-08-08 12:00 | 02:25:32.37 | -60:09:20.8 | HIP 11258 | 10.49 |
| 2026-08-09 00:00 | 02:25:26.81 | -60:11:48.6 | HIP 11258 | 8.00 |
| 2026-08-09 12:00 | 02:25:21.08 | -60:14:16.4 | HIP 11258 | 5.55 |
| 2026-08-10 00:00 | 02:25:15.17 | -60:16:44.0 | HIP 11258 | 3.28 |
| 2026-08-10 12:00 | 02:25:09.10 | -60:19:11.4 | HIP 11258 | 1.93 |
| 2026-08-11 00:00 | 02:25:02.84 | -60:21:38.8 | HIP 11258 | 3.15 |
| 2026-08-11 12:00 | 02:24:56.42 | -60:24:06.0 | HIP 11258 | 5.41 |
| 2026-08-12 00:00 | 02:24:49.82 | -60:26:33.0 | HIP 11258 | 7.87 |
| 2026-08-12 12:00 | 02:24:43.04 | -60:29:00.0 | HIP 11258 | 10.39 |
| 2026-08-13 00:00 | 02:24:36.09 | -60:31:26.6 | HIP 11258 | 12.94 |
| 2026-08-13 12:00 | 02:24:28.96 | -60:33:53.1 | HIP 11258 | 15.50 |
| 2026-08-14 00:00 | 02:24:21.66 | -60:36:19.3 | HIP 11258 | 18.07 |
| 2026-08-14 12:00 | 02:24:14.18 | -60:38:45.4 | HIP 11258 | 20.65 |
| 2026-08-15 00:00 | 02:24:06.52 | -60:41:11.2 | HIP 11258 | 23.24 |
| 2026-08-15 12:00 | 02:23:58.69 | -60:43:36.7 | HIP 10986 | 24.90 |
| 2026-08-16 00:00 | 02:23:50.68 | -60:46:02.0 | HIP 10986 | 26.04 |
| 2026-08-16 12:00 | 02:23:42.49 | -60:48:26.9 | HIP 10899 | 26.30 |
| 2026-08-17 00:00 | 02:23:34.13 | -60:50:51.6 | HIP 10899 | 26.14 |
| 2026-08-17 12:00 | 02:23:25.59 | -60:53:16.0 | HIP 10965 | 25.33 |
| 2026-08-18 00:00 | 02:23:16.87 | -60:55:40.0 | HIP 10965 | 22.80 |
| 2026-08-18 12:00 | 02:23:07.98 | -60:58:03.7 | HIP 10965 | 20.29 |
| 2026-08-19 00:00 | 02:22:58.91 | -61:00:27.1 | HIP 10965 | 17.80 |