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) |
| 2026-07-29 00:00 |
02:20:03.45 |
+30:53:32.7 |
HIP 10954 |
18.50 |
| 2026-07-29 12:00 |
02:20:03.45 |
+30:53:39.8 |
HIP 10954 |
18.58 |
| 2026-07-30 00:00 |
02:20:03.44 |
+30:53:46.8 |
HIP 10954 |
18.67 |
| 2026-07-30 12:00 |
02:20:03.41 |
+30:53:53.8 |
HIP 10954 |
18.76 |
| 2026-07-31 00:00 |
02:20:03.37 |
+30:54:00.8 |
HIP 10954 |
18.84 |
| 2026-07-31 12:00 |
02:20:03.31 |
+30:54:07.6 |
HIP 10954 |
18.93 |
| 2026-08-01 00:00 |
02:20:03.24 |
+30:54:14.5 |
HIP 10954 |
19.03 |
| 2026-08-01 12:00 |
02:20:03.16 |
+30:54:21.2 |
HIP 10954 |
19.12 |
| 2026-08-02 00:00 |
02:20:03.06 |
+30:54:27.9 |
HIP 10954 |
19.22 |
| 2026-08-02 12:00 |
02:20:02.94 |
+30:54:34.5 |
HIP 10954 |
19.31 |
| 2026-08-03 00:00 |
02:20:02.81 |
+30:54:41.1 |
HIP 10954 |
19.41 |
| 2026-08-03 12:00 |
02:20:02.67 |
+30:54:47.6 |
HIP 10954 |
19.51 |
| 2026-08-04 00:00 |
02:20:02.51 |
+30:54:54.0 |
HIP 10954 |
19.61 |
| 2026-08-04 12:00 |
02:20:02.34 |
+30:55:00.4 |
HIP 10954 |
19.72 |
| 2026-08-05 00:00 |
02:20:02.15 |
+30:55:06.7 |
HIP 10954 |
19.82 |
| 2026-08-05 12:00 |
02:20:01.94 |
+30:55:12.9 |
HIP 10954 |
19.93 |
| 2026-08-06 00:00 |
02:20:01.73 |
+30:55:19.0 |
HIP 10954 |
20.04 |
| 2026-08-06 12:00 |
02:20:01.49 |
+30:55:25.1 |
HIP 10954 |
20.14 |
| 2026-08-07 00:00 |
02:20:01.24 |
+30:55:31.2 |
HIP 10954 |
20.26 |
| 2026-08-07 12:00 |
02:20:00.98 |
+30:55:37.1 |
HIP 10954 |
20.37 |
| 2026-08-08 00:00 |
02:20:00.70 |
+30:55:43.0 |
HIP 10954 |
20.48 |
| 2026-08-08 12:00 |
02:20:00.41 |
+30:55:48.9 |
HIP 10954 |
20.59 |
| 2026-08-09 00:00 |
02:20:00.10 |
+30:55:54.6 |
HIP 10954 |
20.71 |
| 2026-08-09 12:00 |
02:19:59.78 |
+30:56:00.3 |
HIP 10954 |
20.83 |
| 2026-08-10 00:00 |
02:19:59.44 |
+30:56:05.9 |
HIP 10954 |
20.94 |
| 2026-08-10 12:00 |
02:19:59.09 |
+30:56:11.4 |
HIP 10954 |
21.06 |
| 2026-08-11 00:00 |
02:19:58.73 |
+30:56:16.9 |
HIP 10954 |
21.18 |
| 2026-08-11 12:00 |
02:19:58.34 |
+30:56:22.3 |
HIP 10954 |
21.30 |
| 2026-08-12 00:00 |
02:19:57.95 |
+30:56:27.6 |
HIP 10954 |
21.43 |
| 2026-08-12 12:00 |
02:19:57.54 |
+30:56:32.9 |
HIP 10954 |
21.55 |
| 2026-08-13 00:00 |
02:19:57.11 |
+30:56:38.1 |
HIP 10954 |
21.68 |
| 2026-08-13 12:00 |
02:19:56.67 |
+30:56:43.2 |
HIP 10954 |
21.80 |
| 2026-08-14 00:00 |
02:19:56.21 |
+30:56:48.2 |
HIP 10954 |
21.93 |
| 2026-08-14 12:00 |
02:19:55.74 |
+30:56:53.1 |
HIP 10954 |
22.06 |
| 2026-08-15 00:00 |
02:19:55.26 |
+30:56:58.0 |
HIP 10954 |
22.19 |
| 2026-08-15 12:00 |
02:19:54.76 |
+30:57:02.8 |
HIP 10954 |
22.32 |
| 2026-08-16 00:00 |
02:19:54.25 |
+30:57:07.5 |
HIP 10954 |
22.45 |
| 2026-08-16 12:00 |
02:19:53.72 |
+30:57:12.2 |
HIP 10954 |
22.59 |
| 2026-08-17 00:00 |
02:19:53.18 |
+30:57:16.8 |
HIP 10954 |
22.72 |
| 2026-08-17 12:00 |
02:19:52.62 |
+30:57:21.3 |
HIP 10954 |
22.86 |
| 2026-08-18 00:00 |
02:19:52.05 |
+30:57:25.7 |
HIP 10868 |
22.84 |
| 2026-08-18 12:00 |
02:19:51.46 |
+30:57:30.0 |
HIP 10868 |
22.76 |
| 2026-08-19 00:00 |
02:19:50.86 |
+30:57:34.3 |
HIP 10868 |
22.70 |