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) |
| 2026-07-29 00:00 |
15:18:39.92 |
+34:26:33.3 |
HIP 74914 |
23.52 |
| 2026-07-29 12:00 |
15:18:39.48 |
+34:26:16.9 |
HIP 74914 |
23.24 |
| 2026-07-30 00:00 |
15:18:39.05 |
+34:26:00.5 |
HIP 74914 |
22.96 |
| 2026-07-30 12:00 |
15:18:38.63 |
+34:25:44.0 |
HIP 74914 |
22.68 |
| 2026-07-31 00:00 |
15:18:38.23 |
+34:25:27.4 |
HIP 74914 |
22.40 |
| 2026-07-31 12:00 |
15:18:37.84 |
+34:25:10.7 |
HIP 74914 |
22.12 |
| 2026-08-01 00:00 |
15:18:37.47 |
+34:24:54.0 |
HIP 74914 |
21.84 |
| 2026-08-01 12:00 |
15:18:37.11 |
+34:24:37.3 |
HIP 74914 |
21.56 |
| 2026-08-02 00:00 |
15:18:36.77 |
+34:24:20.4 |
HIP 74914 |
21.28 |
| 2026-08-02 12:00 |
15:18:36.44 |
+34:24:03.5 |
HIP 74914 |
20.99 |
| 2026-08-03 00:00 |
15:18:36.13 |
+34:23:46.6 |
HIP 74914 |
20.71 |
| 2026-08-03 12:00 |
15:18:35.83 |
+34:23:29.6 |
HIP 74914 |
20.42 |
| 2026-08-04 00:00 |
15:18:35.55 |
+34:23:12.5 |
HIP 74914 |
20.14 |
| 2026-08-04 12:00 |
15:18:35.28 |
+34:22:55.4 |
HIP 74914 |
19.85 |
| 2026-08-05 00:00 |
15:18:35.02 |
+34:22:38.2 |
HIP 74914 |
19.56 |
| 2026-08-05 12:00 |
15:18:34.78 |
+34:22:21.0 |
HIP 74914 |
19.28 |
| 2026-08-06 00:00 |
15:18:34.56 |
+34:22:03.7 |
HIP 74914 |
18.99 |
| 2026-08-06 12:00 |
15:18:34.35 |
+34:21:46.3 |
HIP 74914 |
18.70 |
| 2026-08-07 00:00 |
15:18:34.15 |
+34:21:29.0 |
HIP 74914 |
18.41 |
| 2026-08-07 12:00 |
15:18:33.97 |
+34:21:11.5 |
HIP 74914 |
18.12 |
| 2026-08-08 00:00 |
15:18:33.81 |
+34:20:54.1 |
HIP 74914 |
17.83 |
| 2026-08-08 12:00 |
15:18:33.66 |
+34:20:36.5 |
HIP 74914 |
17.53 |
| 2026-08-09 00:00 |
15:18:33.52 |
+34:20:19.0 |
HIP 74914 |
17.24 |
| 2026-08-09 12:00 |
15:18:33.40 |
+34:20:01.3 |
HIP 74914 |
16.95 |
| 2026-08-10 00:00 |
15:18:33.30 |
+34:19:43.7 |
HIP 74914 |
16.65 |
| 2026-08-10 12:00 |
15:18:33.21 |
+34:19:26.0 |
HIP 74914 |
16.36 |
| 2026-08-11 00:00 |
15:18:33.13 |
+34:19:08.2 |
HIP 74914 |
16.06 |
| 2026-08-11 12:00 |
15:18:33.07 |
+34:18:50.5 |
HIP 74914 |
15.77 |
| 2026-08-12 00:00 |
15:18:33.03 |
+34:18:32.6 |
HIP 74914 |
15.47 |
| 2026-08-12 12:00 |
15:18:33.00 |
+34:18:14.8 |
HIP 74914 |
15.17 |
| 2026-08-13 00:00 |
15:18:32.98 |
+34:17:56.9 |
HIP 74914 |
14.87 |
| 2026-08-13 12:00 |
15:18:32.98 |
+34:17:39.0 |
HIP 74914 |
14.57 |
| 2026-08-14 00:00 |
15:18:33.00 |
+34:17:21.0 |
HIP 74914 |
14.28 |
| 2026-08-14 12:00 |
15:18:33.03 |
+34:17:03.1 |
HIP 74914 |
13.98 |
| 2026-08-15 00:00 |
15:18:33.08 |
+34:16:45.1 |
HIP 74914 |
13.68 |
| 2026-08-15 12:00 |
15:18:33.14 |
+34:16:27.0 |
HIP 74914 |
13.38 |
| 2026-08-16 00:00 |
15:18:33.21 |
+34:16:09.0 |
HIP 74914 |
13.07 |
| 2026-08-16 12:00 |
15:18:33.30 |
+34:15:50.9 |
HIP 74914 |
12.77 |
| 2026-08-17 00:00 |
15:18:33.41 |
+34:15:32.8 |
HIP 74914 |
12.47 |
| 2026-08-17 12:00 |
15:18:33.53 |
+34:15:14.6 |
HIP 74914 |
12.17 |
| 2026-08-18 00:00 |
15:18:33.67 |
+34:14:56.5 |
HIP 74914 |
11.87 |
| 2026-08-18 12:00 |
15:18:33.82 |
+34:14:38.3 |
HIP 74914 |
11.56 |
| 2026-08-19 00:00 |
15:18:33.99 |
+34:14:20.1 |
HIP 74914 |
11.26 |