C/2012 E1 (Hill)
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) |
| 2026-02-03 00:00 |
07:47:49.72 |
+32:57:54.5 |
HIP 38148 |
15.52 |
| 2026-02-03 12:00 |
07:47:44.30 |
+32:57:54.5 |
HIP 38148 |
16.63 |
| 2026-02-04 00:00 |
07:47:38.89 |
+32:57:54.4 |
HIP 38148 |
17.75 |
| 2026-02-04 12:00 |
07:47:33.50 |
+32:57:54.2 |
HIP 38080 |
18.67 |
| 2026-02-05 00:00 |
07:47:28.12 |
+32:57:53.8 |
HIP 38080 |
19.21 |
| 2026-02-05 12:00 |
07:47:22.77 |
+32:57:53.2 |
HIP 38080 |
19.80 |
| 2026-02-06 00:00 |
07:47:17.43 |
+32:57:52.4 |
HIP 38080 |
20.42 |
| 2026-02-06 12:00 |
07:47:12.11 |
+32:57:51.5 |
HIP 38080 |
21.08 |
| 2026-02-07 00:00 |
07:47:06.81 |
+32:57:50.5 |
HIP 38080 |
21.78 |
| 2026-02-07 12:00 |
07:47:01.54 |
+32:57:49.2 |
HIP 38080 |
22.50 |
| 2026-02-08 00:00 |
07:46:56.28 |
+32:57:47.8 |
HIP 38080 |
23.25 |
| 2026-02-08 12:00 |
07:46:51.04 |
+32:57:46.3 |
HIP 38080 |
24.02 |
| 2026-02-09 00:00 |
07:46:45.82 |
+32:57:44.6 |
HIP 38080 |
24.81 |
| 2026-02-09 12:00 |
07:46:40.62 |
+32:57:42.7 |
HIP 38080 |
25.62 |
| 2026-02-10 00:00 |
07:46:35.45 |
+32:57:40.7 |
HIP 38080 |
26.44 |
| 2026-02-10 12:00 |
07:46:30.30 |
+32:57:38.5 |
HIP 38080 |
27.28 |
| 2026-02-11 00:00 |
07:46:25.17 |
+32:57:36.1 |
HIP 38080 |
28.13 |
| 2026-02-11 12:00 |
07:46:20.06 |
+32:57:33.6 |
HIP 38080 |
28.98 |
| 2026-02-12 00:00 |
07:46:14.98 |
+32:57:30.9 |
HIP 38080 |
29.85 |
| 2026-02-12 12:00 |
07:46:09.92 |
+32:57:28.0 |
HIP 38080 |
30.72 |
| 2026-02-13 00:00 |
07:46:04.88 |
+32:57:25.0 |
HIP 38080 |
31.60 |
| 2026-02-13 12:00 |
07:45:59.87 |
+32:57:21.8 |
HIP 38080 |
32.49 |
| 2026-02-14 00:00 |
07:45:54.88 |
+32:57:18.5 |
HIP 37640 |
32.86 |
| 2026-02-14 12:00 |
07:45:49.92 |
+32:57:15.0 |
HIP 37640 |
31.90 |
| 2026-02-15 00:00 |
07:45:44.99 |
+32:57:11.3 |
HIP 37640 |
30.95 |
| 2026-02-15 12:00 |
07:45:40.08 |
+32:57:07.5 |
HIP 37640 |
30.01 |
| 2026-02-16 00:00 |
07:45:35.19 |
+32:57:03.5 |
HIP 37640 |
29.09 |
| 2026-02-16 12:00 |
07:45:30.34 |
+32:56:59.3 |
HIP 37640 |
28.17 |
| 2026-02-17 00:00 |
07:45:25.51 |
+32:56:55.0 |
HIP 37640 |
27.28 |
| 2026-02-17 12:00 |
07:45:20.71 |
+32:56:50.5 |
HIP 37640 |
26.39 |
| 2026-02-18 00:00 |
07:45:15.93 |
+32:56:45.9 |
HIP 37640 |
25.52 |
| 2026-02-18 12:00 |
07:45:11.19 |
+32:56:41.1 |
HIP 37640 |
24.67 |
| 2026-02-19 00:00 |
07:45:06.47 |
+32:56:36.1 |
HIP 37640 |
23.84 |
| 2026-02-19 12:00 |
07:45:01.78 |
+32:56:31.0 |
HIP 37640 |
23.02 |
| 2026-02-20 00:00 |
07:44:57.13 |
+32:56:25.7 |
HIP 37640 |
22.23 |
| 2026-02-20 12:00 |
07:44:52.50 |
+32:56:20.2 |
HIP 37640 |
21.46 |
| 2026-02-21 00:00 |
07:44:47.90 |
+32:56:14.6 |
HIP 37640 |
20.71 |
| 2026-02-21 12:00 |
07:44:43.33 |
+32:56:08.8 |
HIP 37640 |
19.99 |
| 2026-02-22 00:00 |
07:44:38.79 |
+32:56:02.9 |
HIP 37640 |
19.29 |
| 2026-02-22 12:00 |
07:44:34.28 |
+32:55:56.8 |
HIP 37640 |
18.63 |
| 2026-02-23 00:00 |
07:44:29.81 |
+32:55:50.6 |
HIP 37640 |
18.00 |
| 2026-02-23 12:00 |
07:44:25.36 |
+32:55:44.1 |
HIP 37640 |
17.40 |
| 2026-02-24 00:00 |
07:44:20.95 |
+32:55:37.6 |
HIP 37640 |
16.84 |