C/1976 E1 (Bradfield)
メタデータ
| 項目 |
値 |
| Designation |
C/1976 E1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-02-25T01:22:13.275840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
12 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1976-03-12.0000000 |
| e |
0.99987070 |
| q (au) |
0.678293 |
| a (au) |
5245.712828 |
| i (deg) |
147.778213 |
| Ω (om, deg) |
70.213442 |
| ω (w, deg) |
221.765775 |
| M (ma, deg) |
0.000041 |
等級
散乱 + 全体線形
$$
M_a = (14.087 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.087 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.972 |
| 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 |
02:13:23.24 |
+30:22:17.8 |
HIP 10334 |
11.61 |
| 2026-02-03 12:00 |
02:13:23.46 |
+30:22:11.8 |
HIP 10334 |
11.72 |
| 2026-02-04 00:00 |
02:13:23.70 |
+30:22:05.9 |
HIP 10334 |
11.82 |
| 2026-02-04 12:00 |
02:13:23.95 |
+30:22:00.1 |
HIP 10334 |
11.93 |
| 2026-02-05 00:00 |
02:13:24.22 |
+30:21:54.4 |
HIP 10334 |
12.04 |
| 2026-02-05 12:00 |
02:13:24.50 |
+30:21:48.7 |
HIP 10334 |
12.15 |
| 2026-02-06 00:00 |
02:13:24.80 |
+30:21:43.1 |
HIP 10334 |
12.25 |
| 2026-02-06 12:00 |
02:13:25.11 |
+30:21:37.6 |
HIP 10334 |
12.36 |
| 2026-02-07 00:00 |
02:13:25.44 |
+30:21:32.2 |
HIP 10334 |
12.46 |
| 2026-02-07 12:00 |
02:13:25.78 |
+30:21:26.9 |
HIP 10334 |
12.57 |
| 2026-02-08 00:00 |
02:13:26.14 |
+30:21:21.6 |
HIP 10334 |
12.68 |
| 2026-02-08 12:00 |
02:13:26.51 |
+30:21:16.4 |
HIP 10334 |
12.78 |
| 2026-02-09 00:00 |
02:13:26.90 |
+30:21:11.3 |
HIP 10334 |
12.89 |
| 2026-02-09 12:00 |
02:13:27.30 |
+30:21:06.3 |
HIP 10334 |
12.99 |
| 2026-02-10 00:00 |
02:13:27.72 |
+30:21:01.4 |
HIP 10334 |
13.10 |
| 2026-02-10 12:00 |
02:13:28.16 |
+30:20:56.5 |
HIP 10334 |
13.20 |
| 2026-02-11 00:00 |
02:13:28.60 |
+30:20:51.7 |
HIP 10334 |
13.31 |
| 2026-02-11 12:00 |
02:13:29.07 |
+30:20:47.1 |
HIP 10334 |
13.41 |
| 2026-02-12 00:00 |
02:13:29.55 |
+30:20:42.5 |
HIP 10334 |
13.52 |
| 2026-02-12 12:00 |
02:13:30.04 |
+30:20:38.0 |
HIP 10334 |
13.62 |
| 2026-02-13 00:00 |
02:13:30.55 |
+30:20:33.5 |
HIP 10334 |
13.73 |
| 2026-02-13 12:00 |
02:13:31.07 |
+30:20:29.2 |
HIP 10334 |
13.83 |
| 2026-02-14 00:00 |
02:13:31.61 |
+30:20:24.9 |
HIP 10334 |
13.94 |
| 2026-02-14 12:00 |
02:13:32.16 |
+30:20:20.8 |
HIP 10334 |
14.05 |
| 2026-02-15 00:00 |
02:13:32.73 |
+30:20:16.7 |
HIP 10334 |
14.15 |
| 2026-02-15 12:00 |
02:13:33.31 |
+30:20:12.7 |
HIP 10334 |
14.26 |
| 2026-02-16 00:00 |
02:13:33.90 |
+30:20:08.8 |
HIP 10334 |
14.37 |
| 2026-02-16 12:00 |
02:13:34.51 |
+30:20:04.9 |
HIP 10334 |
14.47 |
| 2026-02-17 00:00 |
02:13:35.14 |
+30:20:01.2 |
HIP 10334 |
14.58 |
| 2026-02-17 12:00 |
02:13:35.77 |
+30:19:57.5 |
HIP 10334 |
14.69 |
| 2026-02-18 00:00 |
02:13:36.43 |
+30:19:54.0 |
HIP 10453 |
14.67 |
| 2026-02-18 12:00 |
02:13:37.09 |
+30:19:50.5 |
HIP 10453 |
14.55 |
| 2026-02-19 00:00 |
02:13:37.77 |
+30:19:47.1 |
HIP 10453 |
14.42 |
| 2026-02-19 12:00 |
02:13:38.47 |
+30:19:43.8 |
HIP 10453 |
14.30 |
| 2026-02-20 00:00 |
02:13:39.18 |
+30:19:40.6 |
HIP 10453 |
14.16 |
| 2026-02-20 12:00 |
02:13:39.90 |
+30:19:37.5 |
HIP 10453 |
14.03 |
| 2026-02-21 00:00 |
02:13:40.64 |
+30:19:34.5 |
HIP 10453 |
13.89 |
| 2026-02-21 12:00 |
02:13:41.39 |
+30:19:31.5 |
HIP 10453 |
13.75 |
| 2026-02-22 00:00 |
02:13:42.15 |
+30:19:28.7 |
HIP 10453 |
13.61 |
| 2026-02-22 12:00 |
02:13:42.93 |
+30:19:25.9 |
HIP 10453 |
13.46 |
| 2026-02-23 00:00 |
02:13:43.72 |
+30:19:23.2 |
HIP 10453 |
13.32 |
| 2026-02-23 12:00 |
02:13:44.53 |
+30:19:20.6 |
HIP 10453 |
13.17 |
| 2026-02-24 00:00 |
02:13:45.34 |
+30:19:18.1 |
HIP 10453 |
13.02 |