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) |
| 2026-05-12 00:00 |
02:17:30.28 |
+30:29:16.9 |
HIP 10625 |
33.59 |
| 2026-05-12 12:00 |
02:17:31.94 |
+30:29:25.9 |
HIP 10625 |
33.83 |
| 2026-05-13 00:00 |
02:17:33.58 |
+30:29:34.8 |
HIP 10625 |
34.08 |
| 2026-05-13 12:00 |
02:17:35.23 |
+30:29:43.8 |
HIP 10625 |
34.33 |
| 2026-05-14 00:00 |
02:17:36.87 |
+30:29:52.8 |
HIP 10625 |
34.58 |
| 2026-05-14 12:00 |
02:17:38.51 |
+30:30:01.9 |
HIP 10625 |
34.84 |
| 2026-05-15 00:00 |
02:17:40.14 |
+30:30:11.0 |
HIP 10625 |
35.10 |
| 2026-05-15 12:00 |
02:17:41.77 |
+30:30:20.1 |
HIP 10625 |
35.36 |
| 2026-05-16 00:00 |
02:17:43.39 |
+30:30:29.3 |
HIP 10625 |
35.62 |
| 2026-05-16 12:00 |
02:17:45.01 |
+30:30:38.5 |
HIP 10884 |
35.77 |
| 2026-05-17 00:00 |
02:17:46.63 |
+30:30:47.8 |
HIP 10884 |
35.56 |
| 2026-05-17 12:00 |
02:17:48.24 |
+30:30:57.1 |
HIP 10884 |
35.35 |
| 2026-05-18 00:00 |
02:17:49.84 |
+30:31:06.4 |
HIP 10884 |
35.15 |
| 2026-05-18 12:00 |
02:17:51.44 |
+30:31:15.7 |
HIP 10884 |
34.96 |
| 2026-05-19 00:00 |
02:17:53.04 |
+30:31:25.1 |
HIP 10884 |
34.77 |
| 2026-05-19 12:00 |
02:17:54.63 |
+30:31:34.5 |
HIP 10884 |
34.58 |
| 2026-05-20 00:00 |
02:17:56.22 |
+30:31:43.9 |
HIP 10884 |
34.39 |
| 2026-05-20 12:00 |
02:17:57.80 |
+30:31:53.4 |
HIP 10884 |
34.22 |
| 2026-05-21 00:00 |
02:17:59.37 |
+30:32:02.9 |
HIP 10884 |
34.04 |
| 2026-05-21 12:00 |
02:18:00.94 |
+30:32:12.4 |
HIP 10884 |
33.87 |
| 2026-05-22 00:00 |
02:18:02.50 |
+30:32:21.9 |
HIP 10884 |
33.71 |
| 2026-05-22 12:00 |
02:18:04.06 |
+30:32:31.5 |
HIP 10884 |
33.54 |
| 2026-05-23 00:00 |
02:18:05.61 |
+30:32:41.1 |
HIP 10884 |
33.39 |
| 2026-05-23 12:00 |
02:18:07.15 |
+30:32:50.7 |
HIP 10884 |
33.24 |
| 2026-05-24 00:00 |
02:18:08.69 |
+30:33:00.4 |
HIP 10884 |
33.09 |
| 2026-05-24 12:00 |
02:18:10.22 |
+30:33:10.1 |
HIP 10884 |
32.95 |
| 2026-05-25 00:00 |
02:18:11.75 |
+30:33:19.7 |
HIP 10884 |
32.81 |
| 2026-05-25 12:00 |
02:18:13.27 |
+30:33:29.5 |
HIP 10884 |
32.68 |
| 2026-05-26 00:00 |
02:18:14.78 |
+30:33:39.2 |
HIP 10884 |
32.55 |
| 2026-05-26 12:00 |
02:18:16.29 |
+30:33:49.0 |
HIP 10884 |
32.43 |
| 2026-05-27 00:00 |
02:18:17.79 |
+30:33:58.7 |
HIP 10884 |
32.31 |
| 2026-05-27 12:00 |
02:18:19.28 |
+30:34:08.5 |
HIP 10884 |
32.20 |
| 2026-05-28 00:00 |
02:18:20.77 |
+30:34:18.4 |
HIP 10884 |
32.09 |
| 2026-05-28 12:00 |
02:18:22.25 |
+30:34:28.2 |
HIP 10884 |
31.99 |
| 2026-05-29 00:00 |
02:18:23.72 |
+30:34:38.0 |
HIP 10884 |
31.89 |
| 2026-05-29 12:00 |
02:18:25.18 |
+30:34:47.9 |
HIP 10884 |
31.79 |
| 2026-05-30 00:00 |
02:18:26.64 |
+30:34:57.8 |
HIP 10884 |
31.71 |
| 2026-05-30 12:00 |
02:18:28.09 |
+30:35:07.7 |
HIP 10884 |
31.62 |
| 2026-05-31 00:00 |
02:18:29.53 |
+30:35:17.6 |
HIP 10884 |
31.55 |
| 2026-05-31 12:00 |
02:18:30.96 |
+30:35:27.6 |
HIP 10884 |
31.47 |
| 2026-06-01 00:00 |
02:18:32.39 |
+30:35:37.5 |
HIP 10884 |
31.40 |
| 2026-06-01 12:00 |
02:18:33.81 |
+30:35:47.5 |
HIP 10884 |
31.34 |
| 2026-06-02 00:00 |
02:18:35.22 |
+30:35:57.5 |
HIP 10884 |
31.28 |