139P/Vaisala-Oterma
メタデータ
| 項目 |
値 |
| Designation |
139P/Vaisala-Oterma |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-04-20T10:37:01.891200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:39Z |
| Obs used |
546 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
18.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-11-16.0000000 |
| e |
0.24752589 |
| q (au) |
3.402921 |
| a (au) |
4.522310 |
| i (deg) |
2.328730 |
| Ω (om, deg) |
242.377585 |
| ω (w, deg) |
165.725397 |
| M (ma, deg) |
96.291288 |
等級
散乱 + 全体線形
$$
M_a = (7.897 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.897 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
21:41:12.95 |
-11:52:20.4 |
HIP 107182 |
22.91 |
| 2026-02-03 12:00 |
21:41:46.70 |
-11:49:30.2 |
HIP 107182 |
17.90 |
| 2026-02-04 00:00 |
21:42:20.46 |
-11:46:39.4 |
HIP 107182 |
16.38 |
| 2026-02-04 12:00 |
21:42:54.23 |
-11:43:48.2 |
HIP 107182 |
19.22 |
| 2026-02-05 00:00 |
21:43:28.02 |
-11:40:56.6 |
HIP 107337 |
14.72 |
| 2026-02-05 12:00 |
21:44:01.82 |
-11:38:04.4 |
HIP 107337 |
9.91 |
| 2026-02-06 00:00 |
21:44:35.64 |
-11:35:11.8 |
HIP 107337 |
11.54 |
| 2026-02-06 12:00 |
21:45:09.46 |
-11:32:18.7 |
HIP 107337 |
17.95 |
| 2026-02-07 00:00 |
21:45:43.30 |
-11:29:25.1 |
HIP 107517 |
14.09 |
| 2026-02-07 12:00 |
21:46:17.15 |
-11:26:31.1 |
HIP 107517 |
5.85 |
| 2026-02-08 00:00 |
21:46:51.00 |
-11:23:36.6 |
HIP 107517 |
4.92 |
| 2026-02-08 12:00 |
21:47:24.87 |
-11:20:41.6 |
HIP 107517 |
13.00 |
| 2026-02-09 00:00 |
21:47:58.75 |
-11:17:46.2 |
HIP 107517 |
21.65 |
| 2026-02-09 12:00 |
21:48:32.63 |
-11:14:50.3 |
HIP 107793 |
24.90 |
| 2026-02-10 00:00 |
21:49:06.53 |
-11:11:54.0 |
HIP 107793 |
18.14 |
| 2026-02-10 12:00 |
21:49:40.43 |
-11:08:57.3 |
HIP 107793 |
13.90 |
| 2026-02-11 00:00 |
21:50:14.33 |
-11:06:00.0 |
HIP 107793 |
14.60 |
| 2026-02-11 12:00 |
21:50:48.25 |
-11:03:02.4 |
HIP 107793 |
19.73 |
| 2026-02-12 00:00 |
21:51:22.17 |
-11:00:04.3 |
HIP 107846 |
22.30 |
| 2026-02-12 12:00 |
21:51:56.09 |
-10:57:05.8 |
HIP 107846 |
23.48 |
| 2026-02-13 00:00 |
21:52:30.02 |
-10:54:06.9 |
HIP 108018 |
21.74 |
| 2026-02-13 12:00 |
21:53:03.95 |
-10:51:07.6 |
HIP 108018 |
17.39 |
| 2026-02-14 00:00 |
21:53:37.89 |
-10:48:07.8 |
HIP 108018 |
17.00 |
| 2026-02-14 12:00 |
21:54:11.83 |
-10:45:07.6 |
HIP 108018 |
20.80 |
| 2026-02-15 00:00 |
21:54:45.77 |
-10:42:07.1 |
HIP 108018 |
27.08 |
| 2026-02-15 12:00 |
21:55:19.71 |
-10:39:06.1 |
HIP 108058 |
32.65 |
| 2026-02-16 00:00 |
21:55:53.65 |
-10:36:04.7 |
HIP 108058 |
38.04 |
| 2026-02-16 12:00 |
21:56:27.59 |
-10:33:02.9 |
HIP 108265 |
42.68 |
| 2026-02-17 00:00 |
21:57:01.54 |
-10:30:00.7 |
HIP 108515 |
34.89 |
| 2026-02-17 12:00 |
21:57:35.48 |
-10:26:58.2 |
HIP 108515 |
26.33 |
| 2026-02-18 00:00 |
21:58:09.41 |
-10:23:55.2 |
HIP 108515 |
18.08 |
| 2026-02-18 12:00 |
21:58:43.35 |
-10:20:51.9 |
HIP 108515 |
10.88 |
| 2026-02-19 00:00 |
21:59:17.28 |
-10:17:48.3 |
HIP 108582 |
7.01 |
| 2026-02-19 12:00 |
21:59:51.21 |
-10:14:44.2 |
HIP 108582 |
4.28 |
| 2026-02-20 00:00 |
22:00:25.13 |
-10:11:39.8 |
HIP 108582 |
12.08 |
| 2026-02-20 12:00 |
22:00:59.05 |
-10:08:35.1 |
HIP 108757 |
20.47 |
| 2026-02-21 00:00 |
22:01:32.96 |
-10:05:29.9 |
HIP 108757 |
13.70 |
| 2026-02-21 12:00 |
22:02:06.87 |
-10:02:24.5 |
HIP 108757 |
10.72 |
| 2026-02-22 00:00 |
22:02:40.77 |
-09:59:18.7 |
HIP 108757 |
14.15 |
| 2026-02-22 12:00 |
22:03:14.66 |
-09:56:12.6 |
HIP 108757 |
21.08 |
| 2026-02-23 00:00 |
22:03:48.54 |
-09:53:06.1 |
HIP 109058 |
26.26 |
| 2026-02-23 12:00 |
22:04:22.41 |
-09:49:59.3 |
HIP 109058 |
18.32 |
| 2026-02-24 00:00 |
22:04:56.28 |
-09:46:52.2 |
HIP 109058 |
11.84 |