メタデータ
| 項目 |
値 |
| Designation |
198P/ODAS |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-05-03T01:37:52.590720Z |
| Orbit solution date (soln_date, UTC) |
2024-11-14T12:12:28Z |
| Obs used |
200 |
| NEO |
- |
| M1 |
15.800 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-03-31.0000000 |
| e |
0.44765516 |
| q (au) |
1.979289 |
| a (au) |
3.583430 |
| i (deg) |
1.349850 |
| Ω (om, deg) |
358.743588 |
| ω (w, deg) |
69.062685 |
| M (ma, deg) |
248.983482 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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
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) |
| 2026-07-29 00:00 |
10:12:48.23 |
+11:24:28.2 |
HIP 50110 |
37.21 |
| 2026-07-29 12:00 |
10:13:32.48 |
+11:20:13.7 |
HIP 50110 |
30.03 |
| 2026-07-30 00:00 |
10:14:16.71 |
+11:15:58.9 |
HIP 50110 |
26.27 |
| 2026-07-30 12:00 |
10:15:00.89 |
+11:11:43.9 |
HIP 50110 |
27.37 |
| 2026-07-31 00:00 |
10:15:45.03 |
+11:07:28.6 |
HIP 50424 |
31.07 |
| 2026-07-31 12:00 |
10:16:29.14 |
+11:03:13.1 |
HIP 50424 |
23.29 |
| 2026-08-01 00:00 |
10:17:13.20 |
+10:58:57.2 |
HIP 50424 |
19.73 |
| 2026-08-01 12:00 |
10:17:57.23 |
+10:54:41.2 |
HIP 50424 |
22.51 |
| 2026-08-02 00:00 |
10:18:41.22 |
+10:50:24.8 |
HIP 50611 |
23.81 |
| 2026-08-02 12:00 |
10:19:25.17 |
+10:46:08.2 |
HIP 50611 |
14.28 |
| 2026-08-03 00:00 |
10:20:09.08 |
+10:41:51.4 |
HIP 50611 |
10.50 |
| 2026-08-03 12:00 |
10:20:52.96 |
+10:37:34.3 |
HIP 50611 |
16.90 |
| 2026-08-04 00:00 |
10:21:36.79 |
+10:33:17.0 |
HIP 50611 |
27.02 |
| 2026-08-04 12:00 |
10:22:20.59 |
+10:28:59.4 |
HIP 50950 |
29.90 |
| 2026-08-05 00:00 |
10:23:04.35 |
+10:24:41.6 |
HIP 50950 |
21.30 |
| 2026-08-05 12:00 |
10:23:48.07 |
+10:20:23.6 |
HIP 50950 |
16.77 |
| 2026-08-06 00:00 |
10:24:31.75 |
+10:16:05.3 |
HIP 50999 |
18.70 |
| 2026-08-06 12:00 |
10:25:15.39 |
+10:11:46.8 |
HIP 50999 |
13.25 |
| 2026-08-07 00:00 |
10:25:58.99 |
+10:07:28.1 |
HIP 50999 |
16.41 |
| 2026-08-07 12:00 |
10:26:42.55 |
+10:03:09.2 |
HIP 51213 |
22.28 |
| 2026-08-08 00:00 |
10:27:26.08 |
+09:58:50.1 |
HIP 51213 |
13.47 |
| 2026-08-08 12:00 |
10:28:09.56 |
+09:54:30.7 |
HIP 51213 |
11.56 |
| 2026-08-09 00:00 |
10:28:53.01 |
+09:50:11.2 |
HIP 51316 |
16.29 |
| 2026-08-09 12:00 |
10:29:36.42 |
+09:45:51.5 |
HIP 51316 |
15.57 |
| 2026-08-10 00:00 |
10:30:19.78 |
+09:41:31.5 |
HIP 51316 |
22.04 |
| 2026-08-10 12:00 |
10:31:03.11 |
+09:37:11.4 |
HIP 51582 |
20.01 |
| 2026-08-11 00:00 |
10:31:46.40 |
+09:32:51.2 |
HIP 51582 |
9.29 |
| 2026-08-11 12:00 |
10:32:29.65 |
+09:28:30.7 |
HIP 51582 |
6.12 |
| 2026-08-12 00:00 |
10:33:12.85 |
+09:24:10.1 |
HIP 51624 |
8.30 |
| 2026-08-12 12:00 |
10:33:56.02 |
+09:19:49.3 |
HIP 51624 |
16.67 |
| 2026-08-13 00:00 |
10:34:39.14 |
+09:15:28.4 |
HIP 51624 |
27.41 |
| 2026-08-13 12:00 |
10:35:22.22 |
+09:11:07.3 |
HIP 51898 |
28.05 |
| 2026-08-14 00:00 |
10:36:05.26 |
+09:06:46.0 |
HIP 51975 |
22.84 |
| 2026-08-14 12:00 |
10:36:48.26 |
+09:02:24.6 |
HIP 51975 |
20.97 |
| 2026-08-15 00:00 |
10:37:31.22 |
+08:58:03.1 |
HIP 52056 |
17.65 |
| 2026-08-15 12:00 |
10:38:14.13 |
+08:53:41.5 |
HIP 52056 |
18.19 |
| 2026-08-16 00:00 |
10:38:57.00 |
+08:49:19.7 |
HIP 52187 |
11.23 |
| 2026-08-16 12:00 |
10:39:39.83 |
+08:44:57.9 |
HIP 52187 |
5.64 |
| 2026-08-17 00:00 |
10:40:22.62 |
+08:40:35.9 |
HIP 52187 |
14.12 |
| 2026-08-17 12:00 |
10:41:05.36 |
+08:36:13.8 |
HIP 52315 |
5.11 |
| 2026-08-18 00:00 |
10:41:48.05 |
+08:31:51.6 |
HIP 52315 |
6.37 |
| 2026-08-18 12:00 |
10:42:30.71 |
+08:27:29.3 |
HIP 52387 |
7.52 |
| 2026-08-19 00:00 |
10:43:13.32 |
+08:23:06.9 |
HIP 52387 |
11.43 |