メタデータ
| 項目 |
値 |
| Designation |
C/1975 E1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-04-04T13:55:24.000960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
52 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1975-06-11.0000000 |
| e |
1.00140639 |
| q (au) |
1.216946 |
| a (au) |
-865.298894 |
| i (deg) |
55.243879 |
| Ω (om, deg) |
157.908852 |
| ω (w, deg) |
264.130708 |
| M (ma, deg) |
0.002611 |
等級
散乱 + 全体線形
$$
M_a = (10.105 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.105 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.804 |
| k |
0.800 |
| 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 |
15:19:14.47 |
+33:55:16.0 |
HIP 74914 |
11.54 |
| 2026-09-20 12:00 |
15:19:15.54 |
+33:54:59.3 |
HIP 74914 |
11.89 |
| 2026-09-21 00:00 |
15:19:16.62 |
+33:54:42.7 |
HIP 74914 |
12.24 |
| 2026-09-21 12:00 |
15:19:17.72 |
+33:54:26.2 |
HIP 74914 |
12.60 |
| 2026-09-22 00:00 |
15:19:18.82 |
+33:54:09.7 |
HIP 74914 |
12.95 |
| 2026-09-22 12:00 |
15:19:19.94 |
+33:53:53.3 |
HIP 74914 |
13.31 |
| 2026-09-23 00:00 |
15:19:21.07 |
+33:53:37.0 |
HIP 74914 |
13.67 |
| 2026-09-23 12:00 |
15:19:22.21 |
+33:53:20.8 |
HIP 74914 |
14.03 |
| 2026-09-24 00:00 |
15:19:23.36 |
+33:53:04.6 |
HIP 74914 |
14.39 |
| 2026-09-24 12:00 |
15:19:24.53 |
+33:52:48.5 |
HIP 74914 |
14.75 |
| 2026-09-25 00:00 |
15:19:25.70 |
+33:52:32.5 |
HIP 74914 |
15.11 |
| 2026-09-25 12:00 |
15:19:26.89 |
+33:52:16.5 |
HIP 74914 |
15.47 |
| 2026-09-26 00:00 |
15:19:28.09 |
+33:52:00.6 |
HIP 74914 |
15.83 |
| 2026-09-26 12:00 |
15:19:29.30 |
+33:51:44.8 |
HIP 74914 |
16.20 |
| 2026-09-27 00:00 |
15:19:30.52 |
+33:51:29.1 |
HIP 74914 |
16.56 |
| 2026-09-27 12:00 |
15:19:31.75 |
+33:51:13.5 |
HIP 74914 |
16.93 |
| 2026-09-28 00:00 |
15:19:32.99 |
+33:50:57.9 |
HIP 74914 |
17.29 |
| 2026-09-28 12:00 |
15:19:34.25 |
+33:50:42.4 |
HIP 74914 |
17.66 |
| 2026-09-29 00:00 |
15:19:35.51 |
+33:50:27.0 |
HIP 74914 |
18.02 |
| 2026-09-29 12:00 |
15:19:36.79 |
+33:50:11.7 |
HIP 74914 |
18.39 |
| 2026-09-30 00:00 |
15:19:38.07 |
+33:49:56.4 |
HIP 74914 |
18.76 |
| 2026-09-30 12:00 |
15:19:39.37 |
+33:49:41.3 |
HIP 74914 |
19.13 |
| 2026-10-01 00:00 |
15:19:40.68 |
+33:49:26.2 |
HIP 74914 |
19.50 |
| 2026-10-01 12:00 |
15:19:41.99 |
+33:49:11.3 |
HIP 74914 |
19.87 |
| 2026-10-02 00:00 |
15:19:43.32 |
+33:48:56.4 |
HIP 74914 |
20.24 |
| 2026-10-02 12:00 |
15:19:44.66 |
+33:48:41.6 |
HIP 74914 |
20.61 |
| 2026-10-03 00:00 |
15:19:46.01 |
+33:48:26.9 |
HIP 74914 |
20.98 |
| 2026-10-03 12:00 |
15:19:47.37 |
+33:48:12.3 |
HIP 74914 |
21.36 |
| 2026-10-04 00:00 |
15:19:48.74 |
+33:47:57.7 |
HIP 74914 |
21.73 |
| 2026-10-04 12:00 |
15:19:50.12 |
+33:47:43.3 |
HIP 74914 |
22.10 |
| 2026-10-05 00:00 |
15:19:51.51 |
+33:47:29.0 |
HIP 74914 |
22.47 |
| 2026-10-05 12:00 |
15:19:52.90 |
+33:47:14.7 |
HIP 74914 |
22.85 |
| 2026-10-06 00:00 |
15:19:54.31 |
+33:47:00.6 |
HIP 74914 |
23.22 |
| 2026-10-06 12:00 |
15:19:55.73 |
+33:46:46.6 |
HIP 74914 |
23.60 |
| 2026-10-07 00:00 |
15:19:57.16 |
+33:46:32.6 |
HIP 74914 |
23.97 |
| 2026-10-07 12:00 |
15:19:58.59 |
+33:46:18.8 |
HIP 74914 |
24.35 |
| 2026-10-08 00:00 |
15:20:00.04 |
+33:46:05.1 |
HIP 74914 |
24.72 |
| 2026-10-08 12:00 |
15:20:01.50 |
+33:45:51.4 |
HIP 74914 |
25.10 |
| 2026-10-09 00:00 |
15:20:02.96 |
+33:45:37.9 |
HIP 74914 |
25.48 |
| 2026-10-09 12:00 |
15:20:04.43 |
+33:45:24.5 |
HIP 74914 |
25.85 |
| 2026-10-10 00:00 |
15:20:05.92 |
+33:45:11.2 |
HIP 74914 |
26.23 |
| 2026-10-10 12:00 |
15:20:07.41 |
+33:44:58.0 |
HIP 74914 |
26.60 |
| 2026-10-11 00:00 |
15:20:08.91 |
+33:44:44.9 |
HIP 74914 |
26.98 |