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) |
| 2026-09-20 00:00 |
07:55:18.15 |
+31:10:39.7 |
HIP 38663 |
19.64 |
| 2026-09-20 12:00 |
07:55:19.91 |
+31:10:38.1 |
HIP 38663 |
19.70 |
| 2026-09-21 00:00 |
07:55:21.63 |
+31:10:36.5 |
HIP 38663 |
19.76 |
| 2026-09-21 12:00 |
07:55:23.32 |
+31:10:35.1 |
HIP 38663 |
19.84 |
| 2026-09-22 00:00 |
07:55:24.98 |
+31:10:33.9 |
HIP 38663 |
19.91 |
| 2026-09-22 12:00 |
07:55:26.60 |
+31:10:32.7 |
HIP 38663 |
20.00 |
| 2026-09-23 00:00 |
07:55:28.18 |
+31:10:31.7 |
HIP 38663 |
20.09 |
| 2026-09-23 12:00 |
07:55:29.74 |
+31:10:30.8 |
HIP 38663 |
20.19 |
| 2026-09-24 00:00 |
07:55:31.25 |
+31:10:30.0 |
HIP 38663 |
20.29 |
| 2026-09-24 12:00 |
07:55:32.74 |
+31:10:29.4 |
HIP 38663 |
20.39 |
| 2026-09-25 00:00 |
07:55:34.18 |
+31:10:28.9 |
HIP 38663 |
20.50 |
| 2026-09-25 12:00 |
07:55:35.60 |
+31:10:28.5 |
HIP 38663 |
20.61 |
| 2026-09-26 00:00 |
07:55:36.97 |
+31:10:28.2 |
HIP 38663 |
20.72 |
| 2026-09-26 12:00 |
07:55:38.31 |
+31:10:28.1 |
HIP 38663 |
20.83 |
| 2026-09-27 00:00 |
07:55:39.62 |
+31:10:28.1 |
HIP 38663 |
20.95 |
| 2026-09-27 12:00 |
07:55:40.89 |
+31:10:28.2 |
HIP 38663 |
21.07 |
| 2026-09-28 00:00 |
07:55:42.12 |
+31:10:28.4 |
HIP 38663 |
21.19 |
| 2026-09-28 12:00 |
07:55:43.32 |
+31:10:28.8 |
HIP 38663 |
21.31 |
| 2026-09-29 00:00 |
07:55:44.48 |
+31:10:29.3 |
HIP 38663 |
21.43 |
| 2026-09-29 12:00 |
07:55:45.61 |
+31:10:29.9 |
HIP 38663 |
21.56 |
| 2026-09-30 00:00 |
07:55:46.69 |
+31:10:30.7 |
HIP 38663 |
21.68 |
| 2026-09-30 12:00 |
07:55:47.74 |
+31:10:31.6 |
HIP 38663 |
21.80 |
| 2026-10-01 00:00 |
07:55:48.76 |
+31:10:32.6 |
HIP 38663 |
21.92 |
| 2026-10-01 12:00 |
07:55:49.74 |
+31:10:33.7 |
HIP 38663 |
22.04 |
| 2026-10-02 00:00 |
07:55:50.68 |
+31:10:34.9 |
HIP 38663 |
22.16 |
| 2026-10-02 12:00 |
07:55:51.58 |
+31:10:36.3 |
HIP 38663 |
22.28 |
| 2026-10-03 00:00 |
07:55:52.44 |
+31:10:37.8 |
HIP 38663 |
22.40 |
| 2026-10-03 12:00 |
07:55:53.27 |
+31:10:39.4 |
HIP 38663 |
22.51 |
| 2026-10-04 00:00 |
07:55:54.06 |
+31:10:41.1 |
HIP 38663 |
22.63 |
| 2026-10-04 12:00 |
07:55:54.81 |
+31:10:43.0 |
HIP 38663 |
22.74 |
| 2026-10-05 00:00 |
07:55:55.53 |
+31:10:45.0 |
HIP 38663 |
22.85 |
| 2026-10-05 12:00 |
07:55:56.20 |
+31:10:47.1 |
HIP 38663 |
22.96 |
| 2026-10-06 00:00 |
07:55:56.84 |
+31:10:49.3 |
HIP 38663 |
23.06 |
| 2026-10-06 12:00 |
07:55:57.43 |
+31:10:51.7 |
HIP 38663 |
23.16 |
| 2026-10-07 00:00 |
07:55:57.99 |
+31:10:54.1 |
HIP 38663 |
23.26 |
| 2026-10-07 12:00 |
07:55:58.51 |
+31:10:56.7 |
HIP 38663 |
23.36 |
| 2026-10-08 00:00 |
07:55:58.99 |
+31:10:59.4 |
HIP 38663 |
23.46 |
| 2026-10-08 12:00 |
07:55:59.43 |
+31:11:02.3 |
HIP 38663 |
23.55 |
| 2026-10-09 00:00 |
07:55:59.84 |
+31:11:05.2 |
HIP 38663 |
23.64 |
| 2026-10-09 12:00 |
07:56:00.20 |
+31:11:08.3 |
HIP 38663 |
23.72 |
| 2026-10-10 00:00 |
07:56:00.52 |
+31:11:11.5 |
HIP 38663 |
23.81 |
| 2026-10-10 12:00 |
07:56:00.81 |
+31:11:14.8 |
HIP 38663 |
23.89 |
| 2026-10-11 00:00 |
07:56:01.05 |
+31:11:18.2 |
HIP 38663 |
23.96 |