C/1975 E1 (Bradfield)
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) |
| 2026-02-03 00:00 |
15:25:14.20 |
+33:56:43.7 |
HIP 75497 |
9.14 |
| 2026-02-03 12:00 |
15:25:14.56 |
+33:57:01.5 |
HIP 75497 |
9.43 |
| 2026-02-04 00:00 |
15:25:14.90 |
+33:57:19.4 |
HIP 75497 |
9.72 |
| 2026-02-04 12:00 |
15:25:15.23 |
+33:57:37.4 |
HIP 75497 |
10.01 |
| 2026-02-05 00:00 |
15:25:15.54 |
+33:57:55.4 |
HIP 75497 |
10.31 |
| 2026-02-05 12:00 |
15:25:15.83 |
+33:58:13.5 |
HIP 75497 |
10.60 |
| 2026-02-06 00:00 |
15:25:16.11 |
+33:58:31.6 |
HIP 75497 |
10.90 |
| 2026-02-06 12:00 |
15:25:16.37 |
+33:58:49.8 |
HIP 75497 |
11.20 |
| 2026-02-07 00:00 |
15:25:16.62 |
+33:59:08.0 |
HIP 75497 |
11.50 |
| 2026-02-07 12:00 |
15:25:16.85 |
+33:59:26.3 |
HIP 75497 |
11.80 |
| 2026-02-08 00:00 |
15:25:17.06 |
+33:59:44.6 |
HIP 75497 |
12.11 |
| 2026-02-08 12:00 |
15:25:17.26 |
+34:00:03.0 |
HIP 75497 |
12.41 |
| 2026-02-09 00:00 |
15:25:17.44 |
+34:00:21.4 |
HIP 75497 |
12.72 |
| 2026-02-09 12:00 |
15:25:17.61 |
+34:00:39.9 |
HIP 75497 |
13.02 |
| 2026-02-10 00:00 |
15:25:17.76 |
+34:00:58.4 |
HIP 75497 |
13.33 |
| 2026-02-10 12:00 |
15:25:17.90 |
+34:01:16.9 |
HIP 75497 |
13.64 |
| 2026-02-11 00:00 |
15:25:18.02 |
+34:01:35.5 |
HIP 75497 |
13.95 |
| 2026-02-11 12:00 |
15:25:18.12 |
+34:01:54.1 |
HIP 75497 |
14.26 |
| 2026-02-12 00:00 |
15:25:18.21 |
+34:02:12.8 |
HIP 75497 |
14.57 |
| 2026-02-12 12:00 |
15:25:18.28 |
+34:02:31.5 |
HIP 75497 |
14.88 |
| 2026-02-13 00:00 |
15:25:18.33 |
+34:02:50.2 |
HIP 75497 |
15.19 |
| 2026-02-13 12:00 |
15:25:18.37 |
+34:03:09.0 |
HIP 75497 |
15.50 |
| 2026-02-14 00:00 |
15:25:18.40 |
+34:03:27.8 |
HIP 75497 |
15.82 |
| 2026-02-14 12:00 |
15:25:18.40 |
+34:03:46.6 |
HIP 75497 |
16.13 |
| 2026-02-15 00:00 |
15:25:18.39 |
+34:04:05.5 |
HIP 75497 |
16.45 |
| 2026-02-15 12:00 |
15:25:18.37 |
+34:04:24.4 |
HIP 75497 |
16.76 |
| 2026-02-16 00:00 |
15:25:18.33 |
+34:04:43.3 |
HIP 75497 |
17.08 |
| 2026-02-16 12:00 |
15:25:18.27 |
+34:05:02.2 |
HIP 75497 |
17.39 |
| 2026-02-17 00:00 |
15:25:18.20 |
+34:05:21.2 |
HIP 75497 |
17.71 |
| 2026-02-17 12:00 |
15:25:18.11 |
+34:05:40.1 |
HIP 75497 |
18.02 |
| 2026-02-18 00:00 |
15:25:18.00 |
+34:05:59.1 |
HIP 75497 |
18.34 |
| 2026-02-18 12:00 |
15:25:17.88 |
+34:06:18.1 |
HIP 75572 |
18.53 |
| 2026-02-19 00:00 |
15:25:17.75 |
+34:06:37.2 |
HIP 75572 |
18.32 |
| 2026-02-19 12:00 |
15:25:17.59 |
+34:06:56.2 |
HIP 75572 |
18.10 |
| 2026-02-20 00:00 |
15:25:17.42 |
+34:07:15.3 |
HIP 75572 |
17.90 |
| 2026-02-20 12:00 |
15:25:17.24 |
+34:07:34.3 |
HIP 75572 |
17.70 |
| 2026-02-21 00:00 |
15:25:17.04 |
+34:07:53.4 |
HIP 75572 |
17.50 |
| 2026-02-21 12:00 |
15:25:16.82 |
+34:08:12.5 |
HIP 75572 |
17.31 |
| 2026-02-22 00:00 |
15:25:16.59 |
+34:08:31.6 |
HIP 75572 |
17.13 |
| 2026-02-22 12:00 |
15:25:16.34 |
+34:08:50.7 |
HIP 75572 |
16.95 |
| 2026-02-23 00:00 |
15:25:16.08 |
+34:09:09.8 |
HIP 75572 |
16.78 |
| 2026-02-23 12:00 |
15:25:15.80 |
+34:09:28.9 |
HIP 75572 |
16.62 |
| 2026-02-24 00:00 |
15:25:15.50 |
+34:09:48.0 |
HIP 75572 |
16.47 |