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) |
| 2026-03-26 00:00 |
15:24:30.64 |
+34:28:01.2 |
HIP 75572 |
23.40 |
| 2026-03-26 12:00 |
15:24:29.48 |
+34:28:17.6 |
HIP 75572 |
23.72 |
| 2026-03-27 00:00 |
15:24:28.31 |
+34:28:34.0 |
HIP 75572 |
24.04 |
| 2026-03-27 12:00 |
15:24:27.12 |
+34:28:50.3 |
HIP 75572 |
24.36 |
| 2026-03-28 00:00 |
15:24:25.93 |
+34:29:06.4 |
HIP 75572 |
24.69 |
| 2026-03-28 12:00 |
15:24:24.72 |
+34:29:22.5 |
HIP 75572 |
25.02 |
| 2026-03-29 00:00 |
15:24:23.50 |
+34:29:38.5 |
HIP 75572 |
25.35 |
| 2026-03-29 12:00 |
15:24:22.27 |
+34:29:54.5 |
HIP 75326 |
25.08 |
| 2026-03-30 00:00 |
15:24:21.03 |
+34:30:10.3 |
HIP 75326 |
24.72 |
| 2026-03-30 12:00 |
15:24:19.77 |
+34:30:26.0 |
HIP 75326 |
24.37 |
| 2026-03-31 00:00 |
15:24:18.51 |
+34:30:41.6 |
HIP 75326 |
24.02 |
| 2026-03-31 12:00 |
15:24:17.23 |
+34:30:57.2 |
HIP 75326 |
23.67 |
| 2026-04-01 00:00 |
15:24:15.95 |
+34:31:12.6 |
HIP 75326 |
23.33 |
| 2026-04-01 12:00 |
15:24:14.65 |
+34:31:28.0 |
HIP 75326 |
22.98 |
| 2026-04-02 00:00 |
15:24:13.34 |
+34:31:43.2 |
HIP 75326 |
22.64 |
| 2026-04-02 12:00 |
15:24:12.03 |
+34:31:58.3 |
HIP 75326 |
22.29 |
| 2026-04-03 00:00 |
15:24:10.70 |
+34:32:13.4 |
HIP 75326 |
21.95 |
| 2026-04-03 12:00 |
15:24:09.36 |
+34:32:28.3 |
HIP 75326 |
21.61 |
| 2026-04-04 00:00 |
15:24:08.01 |
+34:32:43.1 |
HIP 75326 |
21.27 |
| 2026-04-04 12:00 |
15:24:06.65 |
+34:32:57.9 |
HIP 75326 |
20.93 |
| 2026-04-05 00:00 |
15:24:05.28 |
+34:33:12.5 |
HIP 75326 |
20.60 |
| 2026-04-05 12:00 |
15:24:03.90 |
+34:33:27.0 |
HIP 75326 |
20.26 |
| 2026-04-06 00:00 |
15:24:02.51 |
+34:33:41.4 |
HIP 75326 |
19.93 |
| 2026-04-06 12:00 |
15:24:01.11 |
+34:33:55.7 |
HIP 75326 |
19.61 |
| 2026-04-07 00:00 |
15:23:59.71 |
+34:34:09.9 |
HIP 75326 |
19.28 |
| 2026-04-07 12:00 |
15:23:58.29 |
+34:34:24.0 |
HIP 75326 |
18.96 |
| 2026-04-08 00:00 |
15:23:56.86 |
+34:34:37.9 |
HIP 75326 |
18.64 |
| 2026-04-08 12:00 |
15:23:55.43 |
+34:34:51.8 |
HIP 75326 |
18.32 |
| 2026-04-09 00:00 |
15:23:53.98 |
+34:35:05.5 |
HIP 75326 |
18.01 |
| 2026-04-09 12:00 |
15:23:52.52 |
+34:35:19.2 |
HIP 75326 |
17.70 |
| 2026-04-10 00:00 |
15:23:51.06 |
+34:35:32.7 |
HIP 75326 |
17.39 |
| 2026-04-10 12:00 |
15:23:49.59 |
+34:35:46.1 |
HIP 75326 |
17.09 |
| 2026-04-11 00:00 |
15:23:48.11 |
+34:35:59.3 |
HIP 75326 |
16.80 |
| 2026-04-11 12:00 |
15:23:46.62 |
+34:36:12.5 |
HIP 75326 |
16.51 |
| 2026-04-12 00:00 |
15:23:45.12 |
+34:36:25.5 |
HIP 75326 |
16.22 |
| 2026-04-12 12:00 |
15:23:43.61 |
+34:36:38.4 |
HIP 75326 |
15.94 |
| 2026-04-13 00:00 |
15:23:42.10 |
+34:36:51.2 |
HIP 75326 |
15.66 |
| 2026-04-13 12:00 |
15:23:40.57 |
+34:37:03.9 |
HIP 75326 |
15.39 |
| 2026-04-14 00:00 |
15:23:39.04 |
+34:37:16.4 |
HIP 75326 |
15.13 |
| 2026-04-14 12:00 |
15:23:37.50 |
+34:37:28.8 |
HIP 75326 |
14.87 |
| 2026-04-15 00:00 |
15:23:35.95 |
+34:37:41.1 |
HIP 75326 |
14.62 |
| 2026-04-15 12:00 |
15:23:34.40 |
+34:37:53.3 |
HIP 75326 |
14.38 |
| 2026-04-16 00:00 |
15:23:32.84 |
+34:38:05.3 |
HIP 75326 |
14.14 |