357P/Hill
メタデータ
| 項目 |
値 |
| Designation |
357P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-12-24T01:09:27.063360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:34Z |
| Obs used |
293 |
| NEO |
- |
| M1 |
5.100 |
| K1 |
29.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-12-05.0000000 |
| e |
0.43548563 |
| q (au) |
2.511840 |
| a (au) |
4.449560 |
| i (deg) |
6.325985 |
| Ω (om, deg) |
44.675030 |
| ω (w, deg) |
1.288453 |
| M (ma, deg) |
36.328214 |
等級
散乱 + 全体線形
$$
M_a = (11.984 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.984 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.860 |
| k |
0.998 |
| 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 |
19:43:58.62 |
-26:06:04.5 |
HIP 97113 |
26.64 |
| 2026-02-03 12:00 |
19:44:32.09 |
-26:04:58.5 |
HIP 97113 |
28.05 |
| 2026-02-04 00:00 |
19:45:05.52 |
-26:03:52.4 |
HIP 97113 |
31.29 |
| 2026-02-04 12:00 |
19:45:38.94 |
-26:02:46.0 |
HIP 97340 |
32.31 |
| 2026-02-05 00:00 |
19:46:12.32 |
-26:01:39.4 |
HIP 97340 |
29.79 |
| 2026-02-05 12:00 |
19:46:45.68 |
-26:00:32.7 |
HIP 97448 |
22.81 |
| 2026-02-06 00:00 |
19:47:19.01 |
-25:59:25.8 |
HIP 97448 |
16.22 |
| 2026-02-06 12:00 |
19:47:52.31 |
-25:58:18.7 |
HIP 97448 |
10.99 |
| 2026-02-07 00:00 |
19:48:25.57 |
-25:57:11.4 |
HIP 97448 |
9.63 |
| 2026-02-07 12:00 |
19:48:58.81 |
-25:56:03.9 |
HIP 97448 |
13.37 |
| 2026-02-08 00:00 |
19:49:32.02 |
-25:54:56.3 |
HIP 97448 |
19.46 |
| 2026-02-08 12:00 |
19:50:05.19 |
-25:53:48.5 |
HIP 97642 |
18.38 |
| 2026-02-09 00:00 |
19:50:38.33 |
-25:52:40.6 |
HIP 97642 |
17.61 |
| 2026-02-09 12:00 |
19:51:11.44 |
-25:51:32.5 |
HIP 97642 |
19.89 |
| 2026-02-10 00:00 |
19:51:44.51 |
-25:50:24.2 |
HIP 97642 |
24.38 |
| 2026-02-10 12:00 |
19:52:17.55 |
-25:49:15.8 |
HIP 97828 |
22.36 |
| 2026-02-11 00:00 |
19:52:50.55 |
-25:48:07.2 |
HIP 97851 |
20.82 |
| 2026-02-11 12:00 |
19:53:23.51 |
-25:46:58.5 |
HIP 97851 |
19.59 |
| 2026-02-12 00:00 |
19:53:56.44 |
-25:45:49.7 |
HIP 98021 |
16.72 |
| 2026-02-12 12:00 |
19:54:29.32 |
-25:44:40.7 |
HIP 98021 |
9.86 |
| 2026-02-13 00:00 |
19:55:02.17 |
-25:43:31.6 |
HIP 98021 |
5.21 |
| 2026-02-13 12:00 |
19:55:34.98 |
-25:42:22.4 |
HIP 98021 |
8.30 |
| 2026-02-14 00:00 |
19:56:07.74 |
-25:41:13.0 |
HIP 98021 |
14.91 |
| 2026-02-14 12:00 |
19:56:40.47 |
-25:40:03.6 |
HIP 98021 |
22.07 |
| 2026-02-15 00:00 |
19:57:13.15 |
-25:38:54.0 |
HIP 98021 |
29.37 |
| 2026-02-15 12:00 |
19:57:45.78 |
-25:37:44.3 |
HIP 98178 |
33.55 |
| 2026-02-16 00:00 |
19:58:18.38 |
-25:36:34.5 |
HIP 98479 |
33.28 |
| 2026-02-16 12:00 |
19:58:50.92 |
-25:35:24.6 |
HIP 98479 |
28.04 |
| 2026-02-17 00:00 |
19:59:23.43 |
-25:34:14.7 |
HIP 98479 |
23.98 |
| 2026-02-17 12:00 |
19:59:55.88 |
-25:33:04.6 |
HIP 98479 |
21.77 |
| 2026-02-18 00:00 |
20:00:28.29 |
-25:31:54.5 |
HIP 98479 |
21.96 |
| 2026-02-18 12:00 |
20:01:00.64 |
-25:30:44.2 |
HIP 98479 |
24.50 |
| 2026-02-19 00:00 |
20:01:32.95 |
-25:29:33.9 |
HIP 98479 |
28.75 |
| 2026-02-19 12:00 |
20:02:05.21 |
-25:28:23.6 |
HIP 98479 |
34.08 |
| 2026-02-20 00:00 |
20:02:37.41 |
-25:27:13.1 |
HIP 98715 |
35.67 |
| 2026-02-20 12:00 |
20:03:09.57 |
-25:26:02.6 |
HIP 98931 |
36.07 |
| 2026-02-21 00:00 |
20:03:41.67 |
-25:24:52.1 |
HIP 98931 |
29.89 |
| 2026-02-21 12:00 |
20:04:13.72 |
-25:23:41.5 |
HIP 98931 |
24.38 |
| 2026-02-22 00:00 |
20:04:45.71 |
-25:22:30.9 |
HIP 98931 |
20.08 |
| 2026-02-22 12:00 |
20:05:17.65 |
-25:21:20.2 |
HIP 98931 |
17.87 |
| 2026-02-23 00:00 |
20:05:49.53 |
-25:20:09.5 |
HIP 99051 |
17.90 |
| 2026-02-23 12:00 |
20:06:21.36 |
-25:18:58.7 |
HIP 99051 |
15.98 |
| 2026-02-24 00:00 |
20:06:53.12 |
-25:17:48.0 |
HIP 99051 |
17.21 |