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) |
|---|---|---|---|---|
| 2026-03-26 00:00 | 18:11:20.75 | -19:13:46.3 | HIP 89061 | 10.71 |
| 2026-03-26 12:00 | 18:11:26.71 | -19:13:34.5 | HIP 89061 | 11.98 |
| 2026-03-27 00:00 | 18:11:32.52 | -19:13:22.7 | HIP 89061 | 13.25 |
| 2026-03-27 12:00 | 18:11:38.18 | -19:13:10.9 | HIP 89061 | 14.50 |
| 2026-03-28 00:00 | 18:11:43.68 | -19:12:59.2 | HIP 89203 | 14.90 |
| 2026-03-28 12:00 | 18:11:49.03 | -19:12:47.5 | HIP 89203 | 14.50 |
| 2026-03-29 00:00 | 18:11:54.22 | -19:12:35.8 | HIP 89203 | 14.22 |
| 2026-03-29 12:00 | 18:11:59.26 | -19:12:24.1 | HIP 89203 | 14.05 |
| 2026-03-30 00:00 | 18:12:04.14 | -19:12:12.5 | HIP 89272 | 13.78 |
| 2026-03-30 12:00 | 18:12:08.87 | -19:12:00.9 | HIP 89272 | 12.71 |
| 2026-03-31 00:00 | 18:12:13.44 | -19:11:49.4 | HIP 89272 | 11.68 |
| 2026-03-31 12:00 | 18:12:17.86 | -19:11:37.9 | HIP 89272 | 10.71 |
| 2026-04-01 00:00 | 18:12:22.11 | -19:11:26.4 | HIP 89272 | 9.79 |
| 2026-04-01 12:00 | 18:12:26.22 | -19:11:15.0 | HIP 89272 | 8.93 |
| 2026-04-02 00:00 | 18:12:30.16 | -19:11:03.7 | HIP 89272 | 8.13 |
| 2026-04-02 12:00 | 18:12:33.95 | -19:10:52.4 | HIP 89272 | 7.40 |
| 2026-04-03 00:00 | 18:12:37.58 | -19:10:41.1 | HIP 89272 | 6.74 |
| 2026-04-03 12:00 | 18:12:41.05 | -19:10:29.9 | HIP 89272 | 6.17 |
| 2026-04-04 00:00 | 18:12:44.36 | -19:10:18.7 | HIP 89272 | 5.70 |
| 2026-04-04 12:00 | 18:12:47.52 | -19:10:07.6 | HIP 89272 | 5.32 |
| 2026-04-05 00:00 | 18:12:50.52 | -19:09:56.6 | HIP 89272 | 5.06 |
| 2026-04-05 12:00 | 18:12:53.36 | -19:09:45.6 | HIP 89272 | 4.90 |
| 2026-04-06 00:00 | 18:12:56.04 | -19:09:34.7 | HIP 89272 | 4.85 |
| 2026-04-06 12:00 | 18:12:58.56 | -19:09:23.8 | HIP 89272 | 4.90 |
| 2026-04-07 00:00 | 18:13:00.92 | -19:09:13.1 | HIP 89272 | 5.02 |
| 2026-04-07 12:00 | 18:13:03.13 | -19:09:02.4 | HIP 89272 | 5.20 |
| 2026-04-08 00:00 | 18:13:05.17 | -19:08:51.7 | HIP 89272 | 5.43 |
| 2026-04-08 12:00 | 18:13:07.06 | -19:08:41.1 | HIP 89272 | 5.68 |
| 2026-04-09 00:00 | 18:13:08.78 | -19:08:30.6 | HIP 89272 | 5.95 |
| 2026-04-09 12:00 | 18:13:10.35 | -19:08:20.2 | HIP 89272 | 6.23 |
| 2026-04-10 00:00 | 18:13:11.75 | -19:08:09.9 | HIP 89272 | 6.50 |
| 2026-04-10 12:00 | 18:13:12.99 | -19:07:59.6 | HIP 89272 | 6.77 |
| 2026-04-11 00:00 | 18:13:14.08 | -19:07:49.5 | HIP 89272 | 7.03 |
| 2026-04-11 12:00 | 18:13:15.00 | -19:07:39.4 | HIP 89272 | 7.27 |
| 2026-04-12 00:00 | 18:13:15.77 | -19:07:29.4 | HIP 89272 | 7.50 |
| 2026-04-12 12:00 | 18:13:16.37 | -19:07:19.5 | HIP 89272 | 7.71 |
| 2026-04-13 00:00 | 18:13:16.81 | -19:07:09.6 | HIP 89272 | 7.90 |
| 2026-04-13 12:00 | 18:13:17.09 | -19:07:00.0 | HIP 89272 | 8.08 |
| 2026-04-14 00:00 | 18:13:17.21 | -19:06:50.3 | HIP 89272 | 8.23 |
| 2026-04-14 12:00 | 18:13:17.17 | -19:06:40.7 | HIP 89272 | 8.37 |
| 2026-04-15 00:00 | 18:13:16.97 | -19:06:31.3 | HIP 89272 | 8.49 |
| 2026-04-15 12:00 | 18:13:16.61 | -19:06:22.0 | HIP 89272 | 8.60 |
| 2026-04-16 00:00 | 18:13:16.09 | -19:06:12.7 | HIP 89272 | 8.69 |