メタデータ
| 項目 |
値 |
| Designation |
C/2012 E1 (Hill) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-07-04T01:06:25.787520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:04Z |
| Obs used |
98 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
9.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-04-26.0000000 |
| e |
0.99801285 |
| q (au) |
7.502904 |
| a (au) |
3775.710106 |
| i (deg) |
122.542018 |
| Ω (om, deg) |
286.319642 |
| ω (w, deg) |
48.887314 |
| M (ma, deg) |
0.001262 |
等級
散乱 + 全体線形
$$
M_a = (1.132 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
1.132 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-06-01 00:00 |
07:42:26.31 |
+32:01:07.7 |
HIP 37339 |
32.27 |
| 2026-06-01 12:00 |
07:42:29.25 |
+32:00:46.6 |
HIP 37339 |
32.89 |
| 2026-06-02 00:00 |
07:42:32.21 |
+32:00:25.5 |
HIP 37339 |
33.52 |
| 2026-06-02 12:00 |
07:42:35.20 |
+32:00:04.4 |
HIP 37339 |
34.16 |
| 2026-06-03 00:00 |
07:42:38.21 |
+31:59:43.4 |
HIP 37775 |
34.08 |
| 2026-06-03 12:00 |
07:42:41.25 |
+31:59:22.3 |
HIP 37775 |
33.80 |
| 2026-06-04 00:00 |
07:42:44.31 |
+31:59:01.3 |
HIP 37775 |
33.52 |
| 2026-06-04 12:00 |
07:42:47.40 |
+31:58:40.3 |
HIP 37775 |
33.26 |
| 2026-06-05 00:00 |
07:42:50.51 |
+31:58:19.3 |
HIP 37775 |
33.01 |
| 2026-06-05 12:00 |
07:42:53.64 |
+31:57:58.3 |
HIP 37775 |
32.77 |
| 2026-06-06 00:00 |
07:42:56.80 |
+31:57:37.4 |
HIP 37775 |
32.54 |
| 2026-06-06 12:00 |
07:42:59.98 |
+31:57:16.5 |
HIP 37775 |
32.32 |
| 2026-06-07 00:00 |
07:43:03.18 |
+31:56:55.6 |
HIP 37775 |
32.12 |
| 2026-06-07 12:00 |
07:43:06.40 |
+31:56:34.7 |
HIP 37775 |
31.93 |
| 2026-06-08 00:00 |
07:43:09.65 |
+31:56:13.9 |
HIP 37775 |
31.75 |
| 2026-06-08 12:00 |
07:43:12.91 |
+31:55:53.1 |
HIP 37775 |
31.59 |
| 2026-06-09 00:00 |
07:43:16.20 |
+31:55:32.3 |
HIP 37775 |
31.44 |
| 2026-06-09 12:00 |
07:43:19.51 |
+31:55:11.5 |
HIP 37775 |
31.31 |
| 2026-06-10 00:00 |
07:43:22.85 |
+31:54:50.8 |
HIP 37775 |
31.20 |
| 2026-06-10 12:00 |
07:43:26.20 |
+31:54:30.1 |
HIP 37775 |
31.10 |
| 2026-06-11 00:00 |
07:43:29.57 |
+31:54:09.4 |
HIP 37775 |
31.02 |
| 2026-06-11 12:00 |
07:43:32.97 |
+31:53:48.8 |
HIP 37775 |
30.95 |
| 2026-06-12 00:00 |
07:43:36.38 |
+31:53:28.1 |
HIP 37775 |
30.91 |
| 2026-06-12 12:00 |
07:43:39.81 |
+31:53:07.6 |
HIP 37775 |
30.88 |
| 2026-06-13 00:00 |
07:43:43.27 |
+31:52:47.0 |
HIP 37775 |
30.87 |
| 2026-06-13 12:00 |
07:43:46.74 |
+31:52:26.5 |
HIP 37775 |
30.88 |
| 2026-06-14 00:00 |
07:43:50.23 |
+31:52:06.0 |
HIP 37775 |
30.91 |
| 2026-06-14 12:00 |
07:43:53.74 |
+31:51:45.6 |
HIP 37775 |
30.96 |
| 2026-06-15 00:00 |
07:43:57.27 |
+31:51:25.2 |
HIP 37775 |
31.02 |
| 2026-06-15 12:00 |
07:44:00.82 |
+31:51:04.8 |
HIP 37775 |
31.11 |
| 2026-06-16 00:00 |
07:44:04.38 |
+31:50:44.5 |
HIP 37775 |
31.22 |
| 2026-06-16 12:00 |
07:44:07.96 |
+31:50:24.2 |
HIP 37775 |
31.35 |
| 2026-06-17 00:00 |
07:44:11.56 |
+31:50:04.0 |
HIP 37775 |
31.49 |
| 2026-06-17 12:00 |
07:44:15.18 |
+31:49:43.8 |
HIP 37775 |
31.66 |
| 2026-06-18 00:00 |
07:44:18.81 |
+31:49:23.6 |
HIP 37775 |
31.85 |
| 2026-06-18 12:00 |
07:44:22.46 |
+31:49:03.5 |
HIP 37775 |
32.05 |
| 2026-06-19 00:00 |
07:44:26.12 |
+31:48:43.4 |
HIP 37775 |
32.28 |
| 2026-06-19 12:00 |
07:44:29.80 |
+31:48:23.4 |
HIP 37775 |
32.53 |
| 2026-06-20 00:00 |
07:44:33.50 |
+31:48:03.4 |
HIP 37775 |
32.79 |
| 2026-06-20 12:00 |
07:44:37.21 |
+31:47:43.5 |
HIP 37775 |
33.07 |
| 2026-06-21 00:00 |
07:44:40.94 |
+31:47:23.6 |
HIP 37991 |
32.90 |
| 2026-06-21 12:00 |
07:44:44.68 |
+31:47:03.8 |
HIP 37991 |
32.23 |
| 2026-06-22 00:00 |
07:44:48.43 |
+31:46:44.0 |
HIP 37991 |
31.56 |