153P/Ikeya-Zhang
メタデータ
| 項目 | 値 |
|---|---|
| Designation | 153P/Ikeya-Zhang |
| Type | P |
| Perihelion (tp_cal, UTC) | 2002-03-18T23:31:25.772160Z |
| Orbit solution date (soln_date, UTC) | 2020-06-17T10:40:41Z |
| Obs used | 1893 |
| NEO | - |
| M1 | 4.000 |
| K1 | 15.000 |
| PC | - |
オスキュレーティング軌道要素
| 項目 | 値 |
|---|---|
| Epoch (epoch_cal, TDB) | 2002-05-08.0000000 |
| e | 0.99008066 |
| q (au) | 0.507070 |
| a (au) | 51.119322 |
| i (deg) | 28.120957 |
| Ω (om, deg) | 93.369457 |
| ω (w, deg) | 34.668179 |
| M (ma, deg) | 0.134887 |
等級
散乱 + 全体線形
$$ M_a = (6.664 + 3.286\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$
モデル定数
| 項目 | 値 |
|---|---|
| H0 | 6.664 |
| n | 3.286 |
| gf | 0.800 |
| gb | -0.500 |
| k | 0.926 |
| δ90 | 1.000 |
| 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 |
|---|---|---|---|
| 2001-08-25 | 2002-02-03 | +7.8269 | +1.084 |
| 2002-02-03 | 2002-03-18 | +3.0720 | +0.799 |
| 2002-03-19 | 2002-06-14 | +0.2085 | +0.283 |
| 2002-06-14 | 2002-10-11 | +5.9255 | -0.694 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) | RA (J2000) | Dec (J2000) | Nearest HIP | Dist from HIP (arcmin) |
|---|---|---|---|---|
| 2026-02-03 00:00 | 20:02:26.95 | -31:54:43.1 | HIP 98782 | 19.28 |
| 2026-02-03 12:00 | 20:02:30.16 | -31:54:37.5 | HIP 98782 | 18.77 |
| 2026-02-04 00:00 | 20:02:33.36 | -31:54:31.9 | HIP 98782 | 18.27 |
| 2026-02-04 12:00 | 20:02:36.56 | -31:54:26.4 | HIP 98782 | 17.78 |
| 2026-02-05 00:00 | 20:02:39.74 | -31:54:21.1 | HIP 98782 | 17.30 |
| 2026-02-05 12:00 | 20:02:42.92 | -31:54:15.8 | HIP 98782 | 16.84 |
| 2026-02-06 00:00 | 20:02:46.09 | -31:54:10.5 | HIP 98782 | 16.40 |
| 2026-02-06 12:00 | 20:02:49.25 | -31:54:05.4 | HIP 98782 | 15.97 |
| 2026-02-07 00:00 | 20:02:52.41 | -31:54:00.4 | HIP 98782 | 15.56 |
| 2026-02-07 12:00 | 20:02:55.55 | -31:53:55.4 | HIP 98782 | 15.17 |
| 2026-02-08 00:00 | 20:02:58.69 | -31:53:50.6 | HIP 98782 | 14.80 |
| 2026-02-08 12:00 | 20:03:01.81 | -31:53:45.8 | HIP 98782 | 14.46 |
| 2026-02-09 00:00 | 20:03:04.93 | -31:53:41.1 | HIP 98782 | 14.13 |
| 2026-02-09 12:00 | 20:03:08.03 | -31:53:36.5 | HIP 98782 | 13.83 |
| 2026-02-10 00:00 | 20:03:11.13 | -31:53:32.0 | HIP 98782 | 13.55 |
| 2026-02-10 12:00 | 20:03:14.21 | -31:53:27.6 | HIP 98782 | 13.31 |
| 2026-02-11 00:00 | 20:03:17.29 | -31:53:23.3 | HIP 98782 | 13.08 |
| 2026-02-11 12:00 | 20:03:20.35 | -31:53:19.1 | HIP 98782 | 12.89 |
| 2026-02-12 00:00 | 20:03:23.40 | -31:53:14.9 | HIP 98782 | 12.73 |
| 2026-02-12 12:00 | 20:03:26.44 | -31:53:10.9 | HIP 98782 | 12.60 |
| 2026-02-13 00:00 | 20:03:29.47 | -31:53:06.9 | HIP 98782 | 12.50 |
| 2026-02-13 12:00 | 20:03:32.49 | -31:53:03.1 | HIP 98782 | 12.43 |
| 2026-02-14 00:00 | 20:03:35.50 | -31:52:59.3 | HIP 98782 | 12.40 |
| 2026-02-14 12:00 | 20:03:38.49 | -31:52:55.6 | HIP 98782 | 12.39 |
| 2026-02-15 00:00 | 20:03:41.47 | -31:52:52.0 | HIP 98782 | 12.42 |
| 2026-02-15 12:00 | 20:03:44.44 | -31:52:48.5 | HIP 98782 | 12.48 |
| 2026-02-16 00:00 | 20:03:47.40 | -31:52:45.1 | HIP 98782 | 12.56 |
| 2026-02-16 12:00 | 20:03:50.34 | -31:52:41.8 | HIP 98842 | 12.35 |
| 2026-02-17 00:00 | 20:03:53.27 | -31:52:38.6 | HIP 98842 | 12.09 |
| 2026-02-17 12:00 | 20:03:56.19 | -31:52:35.5 | HIP 98842 | 11.87 |
| 2026-02-18 00:00 | 20:03:59.09 | -31:52:32.5 | HIP 98842 | 11.67 |
| 2026-02-18 12:00 | 20:04:01.98 | -31:52:29.6 | HIP 98842 | 11.50 |
| 2026-02-19 00:00 | 20:04:04.86 | -31:52:26.8 | HIP 98842 | 11.37 |
| 2026-02-19 12:00 | 20:04:07.72 | -31:52:24.1 | HIP 98842 | 11.26 |
| 2026-02-20 00:00 | 20:04:10.56 | -31:52:21.4 | HIP 98842 | 11.18 |
| 2026-02-20 12:00 | 20:04:13.40 | -31:52:18.9 | HIP 98842 | 11.14 |
| 2026-02-21 00:00 | 20:04:16.21 | -31:52:16.5 | HIP 98842 | 11.12 |
| 2026-02-21 12:00 | 20:04:19.01 | -31:52:14.2 | HIP 98842 | 11.14 |
| 2026-02-22 00:00 | 20:04:21.80 | -31:52:11.9 | HIP 98842 | 11.19 |
| 2026-02-22 12:00 | 20:04:24.57 | -31:52:09.8 | HIP 98842 | 11.26 |
| 2026-02-23 00:00 | 20:04:27.33 | -31:52:07.7 | HIP 98842 | 11.37 |
| 2026-02-23 12:00 | 20:04:30.06 | -31:52:05.8 | HIP 98842 | 11.50 |
| 2026-02-24 00:00 | 20:04:32.79 | -31:52:04.0 | HIP 98842 | 11.65 |