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) |
| 2026-05-12 00:00 |
08:12:47.78 |
+20:41:27.3 |
HIP 40361 |
23.24 |
| 2026-05-12 12:00 |
08:13:33.91 |
+20:38:48.6 |
HIP 40361 |
12.96 |
| 2026-05-13 00:00 |
08:14:20.09 |
+20:36:09.0 |
HIP 40361 |
6.52 |
| 2026-05-13 12:00 |
08:15:06.31 |
+20:33:28.6 |
HIP 40361 |
12.85 |
| 2026-05-14 00:00 |
08:15:52.56 |
+20:30:47.3 |
HIP 40471 |
13.98 |
| 2026-05-14 12:00 |
08:16:38.85 |
+20:28:05.1 |
HIP 40471 |
20.32 |
| 2026-05-15 00:00 |
08:17:25.18 |
+20:25:22.1 |
HIP 40471 |
29.67 |
| 2026-05-15 12:00 |
08:18:11.54 |
+20:22:38.2 |
HIP 40813 |
22.33 |
| 2026-05-16 00:00 |
08:18:57.94 |
+20:19:53.4 |
HIP 40813 |
11.33 |
| 2026-05-16 12:00 |
08:19:44.37 |
+20:17:07.7 |
HIP 40813 |
3.12 |
| 2026-05-17 00:00 |
08:20:30.84 |
+20:14:21.2 |
HIP 40813 |
11.99 |
| 2026-05-17 12:00 |
08:21:17.33 |
+20:11:33.8 |
HIP 41002 |
17.77 |
| 2026-05-18 00:00 |
08:22:03.85 |
+20:08:45.6 |
HIP 41002 |
11.20 |
| 2026-05-18 12:00 |
08:22:50.40 |
+20:05:56.4 |
HIP 41098 |
5.77 |
| 2026-05-19 00:00 |
08:23:36.98 |
+20:03:06.5 |
HIP 41098 |
8.07 |
| 2026-05-19 12:00 |
08:24:23.59 |
+20:00:15.7 |
HIP 41231 |
10.18 |
| 2026-05-20 00:00 |
08:25:10.22 |
+19:57:24.0 |
HIP 41231 |
12.26 |
| 2026-05-20 12:00 |
08:25:56.87 |
+19:54:31.5 |
HIP 41334 |
17.09 |
| 2026-05-21 00:00 |
08:26:43.55 |
+19:51:38.2 |
HIP 41334 |
22.52 |
| 2026-05-21 12:00 |
08:27:30.24 |
+19:48:44.0 |
HIP 41334 |
31.31 |
| 2026-05-22 00:00 |
08:28:16.96 |
+19:45:48.9 |
HIP 41440 |
34.98 |
| 2026-05-22 12:00 |
08:29:03.69 |
+19:42:53.1 |
HIP 41440 |
39.35 |
| 2026-05-23 00:00 |
08:29:50.45 |
+19:39:56.4 |
HIP 41824 |
30.06 |
| 2026-05-23 12:00 |
08:30:37.22 |
+19:36:58.9 |
HIP 41824 |
19.51 |
| 2026-05-24 00:00 |
08:31:24.00 |
+19:34:00.6 |
HIP 41824 |
10.83 |
| 2026-05-24 12:00 |
08:32:10.80 |
+19:31:01.4 |
HIP 41824 |
10.72 |
| 2026-05-25 00:00 |
08:32:57.61 |
+19:28:01.5 |
HIP 41824 |
19.33 |
| 2026-05-25 12:00 |
08:33:44.44 |
+19:25:00.7 |
HIP 42133 |
24.69 |
| 2026-05-26 00:00 |
08:34:31.28 |
+19:21:59.2 |
HIP 42133 |
17.58 |
| 2026-05-26 12:00 |
08:35:18.13 |
+19:18:56.8 |
HIP 42133 |
16.46 |
| 2026-05-27 00:00 |
08:36:04.98 |
+19:15:53.6 |
HIP 42133 |
22.27 |
| 2026-05-27 12:00 |
08:36:51.85 |
+19:12:49.6 |
HIP 42327 |
13.36 |
| 2026-05-28 00:00 |
08:37:38.73 |
+19:09:44.9 |
HIP 42327 |
6.57 |
| 2026-05-28 12:00 |
08:38:25.61 |
+19:06:39.3 |
HIP 42327 |
13.12 |
| 2026-05-29 00:00 |
08:39:12.50 |
+19:03:33.0 |
HIP 42542 |
23.62 |
| 2026-05-29 12:00 |
08:39:59.39 |
+19:00:25.9 |
HIP 42542 |
21.09 |
| 2026-05-30 00:00 |
08:40:46.29 |
+18:57:17.9 |
HIP 42705 |
20.03 |
| 2026-05-30 12:00 |
08:41:33.20 |
+18:54:09.3 |
HIP 42705 |
9.10 |
| 2026-05-31 00:00 |
08:42:20.11 |
+18:50:59.8 |
HIP 42705 |
5.52 |
| 2026-05-31 12:00 |
08:43:07.02 |
+18:47:49.6 |
HIP 42705 |
15.64 |
| 2026-06-01 00:00 |
08:43:53.93 |
+18:44:38.6 |
HIP 42853 |
17.42 |
| 2026-06-01 12:00 |
08:44:40.85 |
+18:41:26.8 |
HIP 42970 |
13.83 |
| 2026-06-02 00:00 |
08:45:27.77 |
+18:38:14.3 |
HIP 42970 |
10.82 |