452P/Sheppard-Jewitt
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 452P/Sheppard-Jewitt |
| Type | P |
| Perihelion (tp_cal, UTC) | 2023-04-24T04:45:31.435200Z |
| Orbit solution date (soln_date, UTC) | 2024-07-13T19:12:23Z |
| Obs used | 219 |
| NEO | - |
| M1 | 13.200 |
| K1 | 4.500 |
| PC | - |
| Discovery observation (MPC, UTC) | 2003-02-08T08:14:22.848000Z |
| Discovery magnitude (MPC) | 22.80 R |
| Discovery observatory (MPC) | 568 · Maunakea |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2016-10-12.0000000 |
| e | 0.42794873 |
| q (au) | 4.159343 |
| a (au) | 7.270927 |
| i (deg) | 6.425559 |
| Ω (om, deg) | 123.796595 |
| ω (w, deg) | 37.298698 |
| M (ma, deg) | 240.093178 |
等級
散乱 + 全体線形
$$ M_a = (11.922 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 11.922 |
| n | 2.000 |
| gf | 1.000 |
| gb | -0.508 |
| k | 1.000 |
| 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 |
|---|---|---|---|
| 2022-01-28 | 2023-04-18 | -25.5241 | +16.486 |
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 | 17:49:17.18 | -19:27:19.7 | HIP 87246 | 33.36 |
| 2026-02-03 12:00 | 17:49:35.91 | -19:27:20.2 | HIP 87410 | 31.53 |
| 2026-02-04 00:00 | 17:49:54.55 | -19:27:20.4 | HIP 87410 | 27.18 |
| 2026-02-04 12:00 | 17:50:13.10 | -19:27:20.4 | HIP 87410 | 22.87 |
| 2026-02-05 00:00 | 17:50:31.56 | -19:27:20.2 | HIP 87410 | 18.61 |
| 2026-02-05 12:00 | 17:50:49.92 | -19:27:19.7 | HIP 87410 | 14.42 |
| 2026-02-06 00:00 | 17:51:08.20 | -19:27:18.9 | HIP 87410 | 10.38 |
| 2026-02-06 12:00 | 17:51:26.38 | -19:27:17.9 | HIP 87410 | 6.70 |
| 2026-02-07 00:00 | 17:51:44.47 | -19:27:16.7 | HIP 87410 | 4.33 |
| 2026-02-07 12:00 | 17:52:02.47 | -19:27:15.2 | HIP 87410 | 5.37 |
| 2026-02-08 00:00 | 17:52:20.36 | -19:27:13.5 | HIP 87410 | 8.64 |
| 2026-02-08 12:00 | 17:52:38.17 | -19:27:11.5 | HIP 87410 | 12.47 |
| 2026-02-09 00:00 | 17:52:55.87 | -19:27:09.4 | HIP 87410 | 16.46 |
| 2026-02-09 12:00 | 17:53:13.48 | -19:27:07.0 | HIP 87410 | 20.50 |
| 2026-02-10 00:00 | 17:53:30.99 | -19:27:04.3 | HIP 87410 | 24.56 |
| 2026-02-10 12:00 | 17:53:48.40 | -19:27:01.5 | HIP 87606 | 26.21 |
| 2026-02-11 00:00 | 17:54:05.71 | -19:26:58.4 | HIP 87606 | 26.62 |
| 2026-02-11 12:00 | 17:54:22.92 | -19:26:55.1 | HIP 87606 | 27.63 |
| 2026-02-12 00:00 | 17:54:40.03 | -19:26:51.6 | HIP 87606 | 29.17 |
| 2026-02-12 12:00 | 17:54:57.03 | -19:26:47.9 | HIP 87606 | 31.14 |
| 2026-02-13 00:00 | 17:55:13.93 | -19:26:44.0 | HIP 87832 | 31.98 |
| 2026-02-13 12:00 | 17:55:30.73 | -19:26:39.8 | HIP 87832 | 29.72 |
| 2026-02-14 00:00 | 17:55:47.42 | -19:26:35.5 | HIP 87832 | 27.85 |
| 2026-02-14 12:00 | 17:56:04.00 | -19:26:30.9 | HIP 87832 | 26.45 |
| 2026-02-15 00:00 | 17:56:20.48 | -19:26:26.2 | HIP 87832 | 25.57 |
| 2026-02-15 12:00 | 17:56:36.85 | -19:26:21.2 | HIP 87832 | 25.26 |
| 2026-02-16 00:00 | 17:56:53.11 | -19:26:16.1 | HIP 87881 | 25.43 |
| 2026-02-16 12:00 | 17:57:09.27 | -19:26:10.7 | HIP 87881 | 25.12 |
| 2026-02-17 00:00 | 17:57:25.31 | -19:26:05.2 | HIP 87881 | 25.37 |
| 2026-02-17 12:00 | 17:57:41.24 | -19:25:59.5 | HIP 88073 | 23.20 |
| 2026-02-18 00:00 | 17:57:57.06 | -19:25:53.6 | HIP 88073 | 19.68 |
| 2026-02-18 12:00 | 17:58:12.77 | -19:25:47.5 | HIP 88073 | 16.28 |
| 2026-02-19 00:00 | 17:58:28.36 | -19:25:41.2 | HIP 88073 | 13.06 |
| 2026-02-19 12:00 | 17:58:43.85 | -19:25:34.8 | HIP 88073 | 10.19 |
| 2026-02-20 00:00 | 17:58:59.21 | -19:25:28.2 | HIP 88073 | 7.99 |
| 2026-02-20 12:00 | 17:59:14.46 | -19:25:21.4 | HIP 88073 | 7.09 |
| 2026-02-21 00:00 | 17:59:29.60 | -19:25:14.5 | HIP 88073 | 7.89 |
| 2026-02-21 12:00 | 17:59:44.62 | -19:25:07.4 | HIP 88073 | 9.98 |
| 2026-02-22 00:00 | 17:59:59.52 | -19:25:00.1 | HIP 88167 | 12.63 |
| 2026-02-22 12:00 | 18:00:14.30 | -19:24:52.7 | HIP 88167 | 11.29 |
| 2026-02-23 00:00 | 18:00:28.96 | -19:24:45.1 | HIP 88167 | 10.94 |
| 2026-02-23 12:00 | 18:00:43.51 | -19:24:37.4 | HIP 88167 | 11.64 |
| 2026-02-24 00:00 | 18:00:57.93 | -19:24:29.5 | HIP 88167 | 13.20 |