178P/Hug-Bell
メタデータ
| 項目 |
値 |
| Designation |
178P/Hug-Bell |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-07-23T00:23:50.688960Z |
| Orbit solution date (soln_date, UTC) |
2024-08-25T21:12:14Z |
| Obs used |
1037 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
11.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-23.0000000 |
| e |
0.47299053 |
| q (au) |
1.933838 |
| a (au) |
3.669456 |
| i (deg) |
10.975306 |
| Ω (om, deg) |
103.574883 |
| ω (w, deg) |
296.946648 |
| M (ma, deg) |
326.065091 |
等級
散乱 + 全体線形
$$
M_a = (12.018 + 4.996\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.018 |
| n |
4.996 |
| gf |
1.000 |
| gb |
-0.833 |
| k |
0.999 |
| 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 |
18:52:10.59 |
-21:33:02.1 |
HIP 92602 |
22.26 |
| 2026-02-03 12:00 |
18:52:46.08 |
-21:32:44.3 |
HIP 92747 |
20.52 |
| 2026-02-04 00:00 |
18:53:21.54 |
-21:32:26.1 |
HIP 92747 |
14.08 |
| 2026-02-04 12:00 |
18:53:56.96 |
-21:32:07.5 |
HIP 92747 |
10.56 |
| 2026-02-05 00:00 |
18:54:32.35 |
-21:31:48.5 |
HIP 92747 |
12.68 |
| 2026-02-05 12:00 |
18:55:07.69 |
-21:31:29.0 |
HIP 92747 |
18.58 |
| 2026-02-06 00:00 |
18:55:43.00 |
-21:31:09.2 |
HIP 92747 |
25.79 |
| 2026-02-06 12:00 |
18:56:18.28 |
-21:30:48.9 |
HIP 93089 |
24.74 |
| 2026-02-07 00:00 |
18:56:53.51 |
-21:30:28.2 |
HIP 93089 |
18.70 |
| 2026-02-07 12:00 |
18:57:28.70 |
-21:30:07.2 |
HIP 93089 |
14.89 |
| 2026-02-08 00:00 |
18:58:03.85 |
-21:29:45.7 |
HIP 93089 |
15.11 |
| 2026-02-08 12:00 |
18:58:38.96 |
-21:29:23.9 |
HIP 93213 |
17.48 |
| 2026-02-09 00:00 |
18:59:14.03 |
-21:29:01.6 |
HIP 93213 |
15.19 |
| 2026-02-09 12:00 |
18:59:49.05 |
-21:28:39.0 |
HIP 93213 |
17.01 |
| 2026-02-10 00:00 |
19:00:24.03 |
-21:28:16.0 |
HIP 93213 |
21.92 |
| 2026-02-10 12:00 |
19:00:58.96 |
-21:27:52.7 |
HIP 93213 |
28.36 |
| 2026-02-11 00:00 |
19:01:33.84 |
-21:27:29.0 |
HIP 93242 |
35.26 |
| 2026-02-11 12:00 |
19:02:08.68 |
-21:27:04.9 |
HIP 93661 |
30.98 |
| 2026-02-12 00:00 |
19:02:43.47 |
-21:26:40.4 |
HIP 93661 |
23.11 |
| 2026-02-12 12:00 |
19:03:18.21 |
-21:26:15.6 |
HIP 93661 |
15.49 |
| 2026-02-13 00:00 |
19:03:52.91 |
-21:25:50.4 |
HIP 93661 |
8.77 |
| 2026-02-13 12:00 |
19:04:27.55 |
-21:25:24.9 |
HIP 93661 |
6.68 |
| 2026-02-14 00:00 |
19:05:02.13 |
-21:24:59.1 |
HIP 93661 |
11.94 |
| 2026-02-14 12:00 |
19:05:36.67 |
-21:24:32.9 |
HIP 93661 |
19.23 |
| 2026-02-15 00:00 |
19:06:11.15 |
-21:24:06.4 |
HIP 93661 |
26.95 |
| 2026-02-15 12:00 |
19:06:45.58 |
-21:23:39.6 |
HIP 93661 |
34.80 |
| 2026-02-16 00:00 |
19:07:19.95 |
-21:23:12.4 |
HIP 94026 |
29.33 |
| 2026-02-16 12:00 |
19:07:54.26 |
-21:22:44.9 |
HIP 94026 |
25.03 |
| 2026-02-17 00:00 |
19:08:28.52 |
-21:22:17.2 |
HIP 94129 |
17.50 |
| 2026-02-17 12:00 |
19:09:02.72 |
-21:21:49.1 |
HIP 94129 |
10.62 |
| 2026-02-18 00:00 |
19:09:36.86 |
-21:21:20.7 |
HIP 94129 |
6.81 |
| 2026-02-18 12:00 |
19:10:10.94 |
-21:20:52.0 |
HIP 94129 |
10.32 |
| 2026-02-19 00:00 |
19:10:44.95 |
-21:20:23.1 |
HIP 94129 |
17.11 |
| 2026-02-19 12:00 |
19:11:18.91 |
-21:19:53.8 |
HIP 94129 |
24.58 |
| 2026-02-20 00:00 |
19:11:52.80 |
-21:19:24.3 |
HIP 94372 |
21.70 |
| 2026-02-20 12:00 |
19:12:26.62 |
-21:18:54.5 |
HIP 94372 |
20.59 |
| 2026-02-21 00:00 |
19:13:00.38 |
-21:18:24.5 |
HIP 94372 |
22.40 |
| 2026-02-21 12:00 |
19:13:34.08 |
-21:17:54.1 |
HIP 94550 |
15.21 |
| 2026-02-22 00:00 |
19:14:07.71 |
-21:17:23.6 |
HIP 94550 |
7.63 |
| 2026-02-22 12:00 |
19:14:41.27 |
-21:16:52.8 |
HIP 94550 |
2.90 |
| 2026-02-23 00:00 |
19:15:14.76 |
-21:16:21.7 |
HIP 94550 |
9.00 |
| 2026-02-23 12:00 |
19:15:48.18 |
-21:15:50.4 |
HIP 94550 |
16.60 |
| 2026-02-24 00:00 |
19:16:21.54 |
-21:15:18.9 |
HIP 94765 |
16.75 |