198P/ODAS
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) |
| 2026-02-03 00:00 |
06:35:55.00 |
+25:12:08.0 |
HIP 31412 |
20.79 |
| 2026-02-03 12:00 |
06:35:51.67 |
+25:11:39.0 |
HIP 31412 |
19.96 |
| 2026-02-04 00:00 |
06:35:48.83 |
+25:11:09.6 |
HIP 31412 |
19.20 |
| 2026-02-04 12:00 |
06:35:46.48 |
+25:10:39.6 |
HIP 31412 |
18.48 |
| 2026-02-05 00:00 |
06:35:44.61 |
+25:10:09.2 |
HIP 31412 |
17.83 |
| 2026-02-05 12:00 |
06:35:43.23 |
+25:09:38.4 |
HIP 31412 |
17.23 |
| 2026-02-06 00:00 |
06:35:42.33 |
+25:09:07.1 |
HIP 31412 |
16.68 |
| 2026-02-06 12:00 |
06:35:41.92 |
+25:08:35.3 |
HIP 31412 |
16.19 |
| 2026-02-07 00:00 |
06:35:42.00 |
+25:08:03.1 |
HIP 31412 |
15.76 |
| 2026-02-07 12:00 |
06:35:42.56 |
+25:07:30.5 |
HIP 31412 |
15.40 |
| 2026-02-08 00:00 |
06:35:43.60 |
+25:06:57.5 |
HIP 31412 |
15.12 |
| 2026-02-08 12:00 |
06:35:45.13 |
+25:06:24.0 |
HIP 31412 |
14.92 |
| 2026-02-09 00:00 |
06:35:47.15 |
+25:05:50.1 |
HIP 31412 |
14.81 |
| 2026-02-09 12:00 |
06:35:49.64 |
+25:05:15.8 |
HIP 31412 |
14.82 |
| 2026-02-10 00:00 |
06:35:52.62 |
+25:04:41.1 |
HIP 31412 |
14.96 |
| 2026-02-10 12:00 |
06:35:56.08 |
+25:04:05.9 |
HIP 31412 |
15.23 |
| 2026-02-11 00:00 |
06:36:00.03 |
+25:03:30.4 |
HIP 31412 |
15.64 |
| 2026-02-11 12:00 |
06:36:04.45 |
+25:02:54.5 |
HIP 31412 |
16.21 |
| 2026-02-12 00:00 |
06:36:09.35 |
+25:02:18.2 |
HIP 31412 |
16.94 |
| 2026-02-12 12:00 |
06:36:14.72 |
+25:01:41.5 |
HIP 31412 |
17.83 |
| 2026-02-13 00:00 |
06:36:20.58 |
+25:01:04.4 |
HIP 31412 |
18.87 |
| 2026-02-13 12:00 |
06:36:26.91 |
+25:00:26.9 |
HIP 31412 |
20.07 |
| 2026-02-14 00:00 |
06:36:33.71 |
+24:59:49.0 |
HIP 31412 |
21.42 |
| 2026-02-14 12:00 |
06:36:40.98 |
+24:59:10.8 |
HIP 31715 |
20.59 |
| 2026-02-15 00:00 |
06:36:48.72 |
+24:58:32.1 |
HIP 31715 |
18.73 |
| 2026-02-15 12:00 |
06:36:56.93 |
+24:57:53.1 |
HIP 31715 |
16.78 |
| 2026-02-16 00:00 |
06:37:05.61 |
+24:57:13.7 |
HIP 31715 |
14.73 |
| 2026-02-16 12:00 |
06:37:14.75 |
+24:56:33.9 |
HIP 31715 |
12.61 |
| 2026-02-17 00:00 |
06:37:24.36 |
+24:55:53.7 |
HIP 31715 |
10.41 |
| 2026-02-17 12:00 |
06:37:34.42 |
+24:55:13.1 |
HIP 31715 |
8.17 |
| 2026-02-18 00:00 |
06:37:44.94 |
+24:54:32.2 |
HIP 31715 |
5.97 |
| 2026-02-18 12:00 |
06:37:55.92 |
+24:53:50.9 |
HIP 31715 |
4.05 |
| 2026-02-19 00:00 |
06:38:07.36 |
+24:53:09.1 |
HIP 31715 |
3.28 |
| 2026-02-19 12:00 |
06:38:19.24 |
+24:52:27.0 |
HIP 31715 |
4.50 |
| 2026-02-20 00:00 |
06:38:31.57 |
+24:51:44.6 |
HIP 31715 |
6.83 |
| 2026-02-20 12:00 |
06:38:44.35 |
+24:51:01.7 |
HIP 31715 |
9.56 |
| 2026-02-21 00:00 |
06:38:57.57 |
+24:50:18.4 |
HIP 31715 |
12.52 |
| 2026-02-21 12:00 |
06:39:11.23 |
+24:49:34.7 |
HIP 31850 |
14.34 |
| 2026-02-22 00:00 |
06:39:25.32 |
+24:48:50.6 |
HIP 31850 |
12.92 |
| 2026-02-22 12:00 |
06:39:39.86 |
+24:48:06.2 |
HIP 31850 |
12.26 |
| 2026-02-23 00:00 |
06:39:54.82 |
+24:47:21.3 |
HIP 31850 |
12.54 |
| 2026-02-23 12:00 |
06:40:10.20 |
+24:46:36.0 |
HIP 31963 |
9.87 |
| 2026-02-24 00:00 |
06:40:26.01 |
+24:45:50.4 |
HIP 31963 |
6.51 |