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
$$ M_a = (10.767 + 2.950\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 10.767 |
| n | 2.950 |
| gf | 1.000 |
| gb | -0.684 |
| 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 | +2.8106 | -1.359 |
| 2023-01-13 | 2024-02-07 | +2.9747 | -0.815 |
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) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 01:29:56.43 | -58:51:18.3 | HIP 7091 | 13.72 |
| 2026-02-03 12:00 | 01:30:00.62 | -58:48:51.9 | HIP 7091 | 11.96 |
| 2026-02-04 00:00 | 01:30:04.95 | -58:46:25.9 | HIP 7091 | 10.48 |
| 2026-02-04 12:00 | 01:30:09.42 | -58:44:00.4 | HIP 7091 | 9.42 |
| 2026-02-05 00:00 | 01:30:14.03 | -58:41:35.2 | HIP 7091 | 8.94 |
| 2026-02-05 12:00 | 01:30:18.78 | -58:39:10.4 | HIP 7091 | 9.11 |
| 2026-02-06 00:00 | 01:30:23.67 | -58:36:46.1 | HIP 7091 | 9.91 |
| 2026-02-06 12:00 | 01:30:28.70 | -58:34:22.3 | HIP 7091 | 11.19 |
| 2026-02-07 00:00 | 01:30:33.86 | -58:31:58.8 | HIP 7091 | 12.82 |
| 2026-02-07 12:00 | 01:30:39.15 | -58:29:35.9 | HIP 7091 | 14.67 |
| 2026-02-08 00:00 | 01:30:44.58 | -58:27:13.3 | HIP 7091 | 16.68 |
| 2026-02-08 12:00 | 01:30:50.14 | -58:24:51.3 | HIP 7091 | 18.78 |
| 2026-02-09 00:00 | 01:30:55.83 | -58:22:29.7 | HIP 7091 | 20.96 |
| 2026-02-09 12:00 | 01:31:01.66 | -58:20:08.6 | HIP 7091 | 23.18 |
| 2026-02-10 00:00 | 01:31:07.61 | -58:17:48.1 | HIP 7297 | 22.72 |
| 2026-02-10 12:00 | 01:31:13.68 | -58:15:28.0 | HIP 7297 | 22.30 |
| 2026-02-11 00:00 | 01:31:19.89 | -58:13:08.4 | HIP 7297 | 22.13 |
| 2026-02-11 12:00 | 01:31:26.22 | -58:10:49.3 | HIP 7297 | 22.21 |
| 2026-02-12 00:00 | 01:31:32.68 | -58:08:30.8 | HIP 7297 | 22.54 |
| 2026-02-12 12:00 | 01:31:39.26 | -58:06:12.8 | HIP 7297 | 23.11 |
| 2026-02-13 00:00 | 01:31:45.96 | -58:03:55.4 | HIP 7297 | 23.90 |
| 2026-02-13 12:00 | 01:31:52.78 | -58:01:38.5 | HIP 7297 | 24.89 |
| 2026-02-14 00:00 | 01:31:59.72 | -57:59:22.1 | HIP 7297 | 26.05 |
| 2026-02-14 12:00 | 01:32:06.79 | -57:57:06.3 | HIP 7387 | 27.29 |
| 2026-02-15 00:00 | 01:32:13.97 | -57:54:51.1 | HIP 7387 | 27.48 |
| 2026-02-15 12:00 | 01:32:21.26 | -57:52:36.5 | HIP 7387 | 27.86 |
| 2026-02-16 00:00 | 01:32:28.68 | -57:50:22.5 | HIP 7387 | 28.42 |
| 2026-02-16 12:00 | 01:32:36.20 | -57:48:09.0 | HIP 7387 | 29.16 |
| 2026-02-17 00:00 | 01:32:43.85 | -57:45:56.2 | HIP 7387 | 30.06 |
| 2026-02-17 12:00 | 01:32:51.60 | -57:43:44.0 | HIP 7387 | 31.10 |
| 2026-02-18 00:00 | 01:32:59.46 | -57:41:32.4 | HIP 7387 | 32.28 |
| 2026-02-18 12:00 | 01:33:07.44 | -57:39:21.4 | HIP 7387 | 33.58 |
| 2026-02-19 00:00 | 01:33:15.52 | -57:37:11.0 | HIP 7387 | 34.97 |
| 2026-02-19 12:00 | 01:33:23.71 | -57:35:01.3 | HIP 7387 | 36.46 |
| 2026-02-20 00:00 | 01:33:32.01 | -57:32:52.3 | HIP 7387 | 38.03 |
| 2026-02-20 12:00 | 01:33:40.42 | -57:30:43.9 | HIP 7588 | 36.61 |
| 2026-02-21 00:00 | 01:33:48.92 | -57:28:36.1 | HIP 7588 | 34.67 |
| 2026-02-21 12:00 | 01:33:57.54 | -57:26:29.1 | HIP 7588 | 32.77 |
| 2026-02-22 00:00 | 01:34:06.25 | -57:24:22.7 | HIP 7588 | 30.95 |
| 2026-02-22 12:00 | 01:34:15.06 | -57:22:17.0 | HIP 7588 | 29.19 |
| 2026-02-23 00:00 | 01:34:23.97 | -57:20:12.0 | HIP 7588 | 27.52 |
| 2026-02-23 12:00 | 01:34:32.99 | -57:18:07.6 | HIP 7588 | 25.95 |
| 2026-02-24 00:00 | 01:34:42.09 | -57:16:04.0 | HIP 7588 | 24.50 |