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 |
0.988 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
9.999 |
| 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 |
07:40:52.00 |
+32:15:16.7 |
HIP 37326 |
15.55 |
| 2026-05-12 12:00 |
07:40:53.74 |
+32:14:55.6 |
HIP 37326 |
16.03 |
| 2026-05-13 00:00 |
07:40:55.51 |
+32:14:34.5 |
HIP 37326 |
16.52 |
| 2026-05-13 12:00 |
07:40:57.32 |
+32:14:13.4 |
HIP 37326 |
17.02 |
| 2026-05-14 00:00 |
07:40:59.17 |
+32:13:52.3 |
HIP 37326 |
17.53 |
| 2026-05-14 12:00 |
07:41:01.05 |
+32:13:31.1 |
HIP 37326 |
18.05 |
| 2026-05-15 00:00 |
07:41:02.96 |
+32:13:09.9 |
HIP 37326 |
18.57 |
| 2026-05-15 12:00 |
07:41:04.90 |
+32:12:48.7 |
HIP 37326 |
19.10 |
| 2026-05-16 00:00 |
07:41:06.88 |
+32:12:27.5 |
HIP 37339 |
19.45 |
| 2026-05-16 12:00 |
07:41:08.89 |
+32:12:06.3 |
HIP 37339 |
19.58 |
| 2026-05-17 00:00 |
07:41:10.94 |
+32:11:45.1 |
HIP 37339 |
19.73 |
| 2026-05-17 12:00 |
07:41:13.01 |
+32:11:23.9 |
HIP 37339 |
19.90 |
| 2026-05-18 00:00 |
07:41:15.12 |
+32:11:02.6 |
HIP 37339 |
20.09 |
| 2026-05-18 12:00 |
07:41:17.26 |
+32:10:41.4 |
HIP 37339 |
20.30 |
| 2026-05-19 00:00 |
07:41:19.44 |
+32:10:20.1 |
HIP 37339 |
20.53 |
| 2026-05-19 12:00 |
07:41:21.64 |
+32:09:58.8 |
HIP 37339 |
20.78 |
| 2026-05-20 00:00 |
07:41:23.88 |
+32:09:37.6 |
HIP 37339 |
21.05 |
| 2026-05-20 12:00 |
07:41:26.14 |
+32:09:16.3 |
HIP 37339 |
21.34 |
| 2026-05-21 00:00 |
07:41:28.44 |
+32:08:55.0 |
HIP 37339 |
21.65 |
| 2026-05-21 12:00 |
07:41:30.77 |
+32:08:33.7 |
HIP 37339 |
21.98 |
| 2026-05-22 00:00 |
07:41:33.13 |
+32:08:12.4 |
HIP 37339 |
22.32 |
| 2026-05-22 12:00 |
07:41:35.52 |
+32:07:51.1 |
HIP 37339 |
22.68 |
| 2026-05-23 00:00 |
07:41:37.94 |
+32:07:29.9 |
HIP 37339 |
23.06 |
| 2026-05-23 12:00 |
07:41:40.39 |
+32:07:08.6 |
HIP 37339 |
23.45 |
| 2026-05-24 00:00 |
07:41:42.87 |
+32:06:47.3 |
HIP 37339 |
23.86 |
| 2026-05-24 12:00 |
07:41:45.37 |
+32:06:26.0 |
HIP 37339 |
24.29 |
| 2026-05-25 00:00 |
07:41:47.91 |
+32:06:04.7 |
HIP 37339 |
24.73 |
| 2026-05-25 12:00 |
07:41:50.47 |
+32:05:43.5 |
HIP 37339 |
25.19 |
| 2026-05-26 00:00 |
07:41:53.07 |
+32:05:22.2 |
HIP 37339 |
25.66 |
| 2026-05-26 12:00 |
07:41:55.69 |
+32:05:00.9 |
HIP 37339 |
26.14 |
| 2026-05-27 00:00 |
07:41:58.34 |
+32:04:39.7 |
HIP 37339 |
26.64 |
| 2026-05-27 12:00 |
07:42:01.01 |
+32:04:18.4 |
HIP 37339 |
27.15 |
| 2026-05-28 00:00 |
07:42:03.72 |
+32:03:57.2 |
HIP 37339 |
27.67 |
| 2026-05-28 12:00 |
07:42:06.45 |
+32:03:36.0 |
HIP 37339 |
28.21 |
| 2026-05-29 00:00 |
07:42:09.21 |
+32:03:14.8 |
HIP 37339 |
28.76 |
| 2026-05-29 12:00 |
07:42:11.99 |
+32:02:53.6 |
HIP 37339 |
29.32 |
| 2026-05-30 00:00 |
07:42:14.80 |
+32:02:32.4 |
HIP 37339 |
29.89 |
| 2026-05-30 12:00 |
07:42:17.64 |
+32:02:11.2 |
HIP 37339 |
30.47 |
| 2026-05-31 00:00 |
07:42:20.50 |
+32:01:50.0 |
HIP 37339 |
31.06 |
| 2026-05-31 12:00 |
07:42:23.39 |
+32:01:28.9 |
HIP 37339 |
31.66 |
| 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 |