メタデータ
| 項目 |
値 |
| Designation |
326P/Hill |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-10-22T11:02:45.530880Z |
| Orbit solution date (soln_date, UTC) |
2024-06-14T15:42:23Z |
| Obs used |
301 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
8.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-02-09.0000000 |
| e |
0.31693822 |
| q (au) |
2.779374 |
| a (au) |
4.068993 |
| i (deg) |
2.470614 |
| Ω (om, deg) |
99.811413 |
| ω (w, deg) |
278.793743 |
| M (ma, deg) |
57.103197 |
等級
散乱 + 全体線形
$$
M_a = (14.907 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.907 |
| n |
2.000 |
| gf |
0.829 |
| gb |
-0.500 |
| k |
0.946 |
| δ90 |
1.000 |
| 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) |
| 2026-05-12 00:00 |
09:34:00.49 |
+16:35:30.9 |
HIP 46999 |
13.67 |
| 2026-05-12 12:00 |
09:34:10.91 |
+16:34:31.6 |
HIP 46999 |
11.14 |
| 2026-05-13 00:00 |
09:34:21.50 |
+16:33:31.5 |
HIP 46999 |
8.68 |
| 2026-05-13 12:00 |
09:34:32.27 |
+16:32:30.6 |
HIP 46999 |
6.41 |
| 2026-05-14 00:00 |
09:34:43.20 |
+16:31:28.8 |
HIP 46999 |
4.70 |
| 2026-05-14 12:00 |
09:34:54.30 |
+16:30:26.2 |
HIP 46999 |
4.35 |
| 2026-05-15 00:00 |
09:35:05.56 |
+16:29:22.8 |
HIP 46999 |
5.70 |
| 2026-05-15 12:00 |
09:35:16.99 |
+16:28:18.6 |
HIP 46999 |
7.97 |
| 2026-05-16 00:00 |
09:35:28.58 |
+16:27:13.6 |
HIP 46999 |
10.61 |
| 2026-05-16 12:00 |
09:35:40.34 |
+16:26:07.7 |
HIP 46999 |
13.43 |
| 2026-05-17 00:00 |
09:35:52.26 |
+16:25:01.1 |
HIP 46999 |
16.37 |
| 2026-05-17 12:00 |
09:36:04.34 |
+16:23:53.6 |
HIP 47189 |
14.17 |
| 2026-05-18 00:00 |
09:36:16.57 |
+16:22:45.4 |
HIP 47189 |
11.58 |
| 2026-05-18 12:00 |
09:36:28.97 |
+16:21:36.3 |
HIP 47189 |
9.32 |
| 2026-05-19 00:00 |
09:36:41.52 |
+16:20:26.5 |
HIP 47189 |
7.72 |
| 2026-05-19 12:00 |
09:36:54.23 |
+16:19:15.9 |
HIP 47196 |
6.54 |
| 2026-05-20 00:00 |
09:37:07.10 |
+16:18:04.5 |
HIP 47196 |
4.52 |
| 2026-05-20 12:00 |
09:37:20.12 |
+16:16:52.3 |
HIP 47196 |
4.48 |
| 2026-05-21 00:00 |
09:37:33.29 |
+16:15:39.4 |
HIP 47196 |
6.52 |
| 2026-05-21 12:00 |
09:37:46.61 |
+16:14:25.7 |
HIP 47196 |
9.41 |
| 2026-05-22 00:00 |
09:38:00.08 |
+16:13:11.2 |
HIP 47196 |
12.61 |
| 2026-05-22 12:00 |
09:38:13.70 |
+16:11:56.0 |
HIP 47196 |
15.96 |
| 2026-05-23 00:00 |
09:38:27.47 |
+16:10:40.1 |
HIP 47196 |
19.40 |
| 2026-05-23 12:00 |
09:38:41.38 |
+16:09:23.4 |
HIP 47196 |
22.91 |
| 2026-05-24 00:00 |
09:38:55.44 |
+16:08:05.9 |
HIP 47196 |
26.47 |
| 2026-05-24 12:00 |
09:39:09.64 |
+16:06:47.8 |
HIP 47196 |
30.08 |
| 2026-05-25 00:00 |
09:39:23.99 |
+16:05:28.9 |
HIP 47196 |
33.74 |
| 2026-05-25 12:00 |
09:39:38.47 |
+16:04:09.2 |
HIP 47557 |
35.99 |
| 2026-05-26 00:00 |
09:39:53.10 |
+16:02:48.9 |
HIP 47557 |
32.30 |
| 2026-05-26 12:00 |
09:40:07.86 |
+16:01:27.8 |
HIP 47557 |
28.60 |
| 2026-05-27 00:00 |
09:40:22.76 |
+16:00:06.0 |
HIP 47557 |
24.89 |
| 2026-05-27 12:00 |
09:40:37.80 |
+15:58:43.5 |
HIP 47557 |
21.19 |
| 2026-05-28 00:00 |
09:40:52.98 |
+15:57:20.3 |
HIP 47557 |
17.53 |
| 2026-05-28 12:00 |
09:41:08.28 |
+15:55:56.4 |
HIP 47557 |
13.97 |
| 2026-05-29 00:00 |
09:41:23.73 |
+15:54:31.9 |
HIP 47557 |
10.66 |
| 2026-05-29 12:00 |
09:41:39.30 |
+15:53:06.6 |
HIP 47557 |
7.96 |
| 2026-05-30 00:00 |
09:41:55.00 |
+15:51:40.6 |
HIP 47557 |
6.72 |
| 2026-05-30 12:00 |
09:42:10.84 |
+15:50:13.9 |
HIP 47557 |
7.74 |
| 2026-05-31 00:00 |
09:42:26.80 |
+15:48:46.6 |
HIP 47557 |
10.41 |
| 2026-05-31 12:00 |
09:42:42.89 |
+15:47:18.6 |
HIP 47557 |
13.83 |
| 2026-06-01 00:00 |
09:42:59.11 |
+15:45:49.9 |
HIP 47557 |
17.60 |
| 2026-06-01 12:00 |
09:43:15.46 |
+15:44:20.5 |
HIP 47557 |
21.55 |
| 2026-06-02 00:00 |
09:43:31.93 |
+15:42:50.5 |
HIP 47557 |
25.61 |