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) |
|---|---|---|---|---|
| 2026-05-12 00:00 | 18:09:18.43 | -19:01:03.3 | HIP 88982 | 12.08 |
| 2026-05-12 12:00 | 18:09:10.10 | -19:01:01.0 | HIP 88982 | 13.16 |
| 2026-05-13 00:00 | 18:09:01.65 | -19:00:58.8 | HIP 88982 | 14.45 |
| 2026-05-13 12:00 | 18:08:53.07 | -19:00:56.8 | HIP 88982 | 15.92 |
| 2026-05-14 00:00 | 18:08:44.37 | -19:00:54.9 | HIP 88982 | 17.52 |
| 2026-05-14 12:00 | 18:08:35.54 | -19:00:53.2 | HIP 88982 | 19.24 |
| 2026-05-15 00:00 | 18:08:26.59 | -19:00:51.6 | HIP 88762 | 18.60 |
| 2026-05-15 12:00 | 18:08:17.52 | -19:00:50.1 | HIP 88762 | 16.60 |
| 2026-05-16 00:00 | 18:08:08.33 | -19:00:48.8 | HIP 88762 | 14.62 |
| 2026-05-16 12:00 | 18:07:59.02 | -19:00:47.7 | HIP 88762 | 12.67 |
| 2026-05-17 00:00 | 18:07:49.60 | -19:00:46.6 | HIP 88762 | 10.81 |
| 2026-05-17 12:00 | 18:07:40.06 | -19:00:45.8 | HIP 88762 | 9.09 |
| 2026-05-18 00:00 | 18:07:30.40 | -19:00:45.1 | HIP 88762 | 7.64 |
| 2026-05-18 12:00 | 18:07:20.63 | -19:00:44.5 | HIP 88762 | 6.68 |
| 2026-05-19 00:00 | 18:07:10.75 | -19:00:44.1 | HIP 88762 | 6.44 |
| 2026-05-19 12:00 | 18:07:00.76 | -19:00:43.8 | HIP 88718 | 4.57 |
| 2026-05-20 00:00 | 18:06:50.67 | -19:00:43.7 | HIP 88718 | 2.51 |
| 2026-05-20 12:00 | 18:06:40.46 | -19:00:43.7 | HIP 88718 | 1.77 |
| 2026-05-21 00:00 | 18:06:30.16 | -19:00:43.9 | HIP 88704 | 3.33 |
| 2026-05-21 12:00 | 18:06:19.74 | -19:00:44.2 | HIP 88704 | 4.27 |
| 2026-05-22 00:00 | 18:06:09.23 | -19:00:44.7 | HIP 88704 | 6.14 |
| 2026-05-22 12:00 | 18:05:58.61 | -19:00:45.3 | HIP 88704 | 8.36 |
| 2026-05-23 00:00 | 18:05:47.90 | -19:00:46.0 | HIP 88704 | 10.73 |
| 2026-05-23 12:00 | 18:05:37.09 | -19:00:46.9 | HIP 88704 | 13.18 |
| 2026-05-24 00:00 | 18:05:26.19 | -19:00:47.9 | HIP 88704 | 15.69 |
| 2026-05-24 12:00 | 18:05:15.19 | -19:00:49.1 | HIP 88704 | 18.23 |
| 2026-05-25 00:00 | 18:05:04.09 | -19:00:50.4 | HIP 88704 | 20.81 |
| 2026-05-25 12:00 | 18:04:52.91 | -19:00:51.9 | HIP 88704 | 23.43 |
| 2026-05-26 00:00 | 18:04:41.64 | -19:00:53.5 | HIP 88704 | 26.06 |
| 2026-05-26 12:00 | 18:04:30.28 | -19:00:55.3 | HIP 88704 | 28.73 |
| 2026-05-27 00:00 | 18:04:18.83 | -19:00:57.1 | HIP 88341 | 27.78 |
| 2026-05-27 12:00 | 18:04:07.30 | -19:00:59.2 | HIP 88341 | 25.22 |
| 2026-05-28 00:00 | 18:03:55.69 | -19:01:01.3 | HIP 88341 | 22.69 |
| 2026-05-28 12:00 | 18:03:44.00 | -19:01:03.6 | HIP 88341 | 20.19 |
| 2026-05-29 00:00 | 18:03:32.22 | -19:01:06.1 | HIP 88341 | 17.75 |
| 2026-05-29 12:00 | 18:03:20.37 | -19:01:08.6 | HIP 88341 | 15.41 |
| 2026-05-30 00:00 | 18:03:08.44 | -19:01:11.4 | HIP 88341 | 13.23 |
| 2026-05-30 12:00 | 18:02:56.44 | -19:01:14.2 | HIP 88341 | 11.34 |
| 2026-05-31 00:00 | 18:02:44.37 | -19:01:17.2 | HIP 88341 | 9.89 |
| 2026-05-31 12:00 | 18:02:32.22 | -19:01:20.3 | HIP 88341 | 9.12 |
| 2026-06-01 00:00 | 18:02:20.00 | -19:01:23.6 | HIP 88297 | 8.23 |
| 2026-06-01 12:00 | 18:02:07.72 | -19:01:27.0 | HIP 88297 | 6.12 |
| 2026-06-02 00:00 | 18:01:55.37 | -19:01:30.5 | HIP 88297 | 4.91 |