C/1976 D1 (Bradfield)
メタデータ
| 項目 |
値 |
| Designation |
C/1976 D1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1976-02-24T15:11:04.778880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
29 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1976-03-08.0000000 |
| e |
0.99342533 |
| q (au) |
0.847793 |
| a (au) |
128.948233 |
| i (deg) |
46.830935 |
| Ω (om, deg) |
160.792814 |
| ω (w, deg) |
313.000258 |
| M (ma, deg) |
0.008324 |
等級
散乱 + 全体線形
$$
M_a = (11.846 + 2.217\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.846 |
| n |
2.217 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
19:18:01.61 |
+15:45:01.4 |
HIP 94894 |
10.01 |
| 2026-02-03 12:00 |
19:18:03.19 |
+15:45:10.3 |
HIP 94894 |
9.73 |
| 2026-02-04 00:00 |
19:18:04.77 |
+15:45:19.3 |
HIP 94894 |
9.46 |
| 2026-02-04 12:00 |
19:18:06.34 |
+15:45:28.5 |
HIP 94894 |
9.21 |
| 2026-02-05 00:00 |
19:18:07.90 |
+15:45:37.7 |
HIP 94894 |
8.96 |
| 2026-02-05 12:00 |
19:18:09.46 |
+15:45:47.1 |
HIP 94894 |
8.74 |
| 2026-02-06 00:00 |
19:18:11.01 |
+15:45:56.5 |
HIP 94894 |
8.53 |
| 2026-02-06 12:00 |
19:18:12.56 |
+15:46:06.1 |
HIP 94894 |
8.33 |
| 2026-02-07 00:00 |
19:18:14.09 |
+15:46:15.8 |
HIP 94894 |
8.15 |
| 2026-02-07 12:00 |
19:18:15.62 |
+15:46:25.5 |
HIP 94894 |
8.00 |
| 2026-02-08 00:00 |
19:18:17.15 |
+15:46:35.4 |
HIP 94894 |
7.86 |
| 2026-02-08 12:00 |
19:18:18.66 |
+15:46:45.4 |
HIP 94894 |
7.74 |
| 2026-02-09 00:00 |
19:18:20.17 |
+15:46:55.5 |
HIP 94894 |
7.64 |
| 2026-02-09 12:00 |
19:18:21.67 |
+15:47:05.7 |
HIP 94894 |
7.57 |
| 2026-02-10 00:00 |
19:18:23.16 |
+15:47:16.0 |
HIP 94894 |
7.52 |
| 2026-02-10 12:00 |
19:18:24.64 |
+15:47:26.4 |
HIP 94894 |
7.49 |
| 2026-02-11 00:00 |
19:18:26.12 |
+15:47:36.9 |
HIP 94894 |
7.49 |
| 2026-02-11 12:00 |
19:18:27.58 |
+15:47:47.5 |
HIP 94894 |
7.51 |
| 2026-02-12 00:00 |
19:18:29.04 |
+15:47:58.2 |
HIP 94894 |
7.55 |
| 2026-02-12 12:00 |
19:18:30.49 |
+15:48:09.0 |
HIP 94894 |
7.62 |
| 2026-02-13 00:00 |
19:18:31.93 |
+15:48:19.8 |
HIP 94894 |
7.70 |
| 2026-02-13 12:00 |
19:18:33.37 |
+15:48:30.8 |
HIP 94894 |
7.81 |
| 2026-02-14 00:00 |
19:18:34.79 |
+15:48:41.9 |
HIP 94894 |
7.94 |
| 2026-02-14 12:00 |
19:18:36.21 |
+15:48:53.1 |
HIP 94894 |
8.08 |
| 2026-02-15 00:00 |
19:18:37.61 |
+15:49:04.4 |
HIP 94894 |
8.24 |
| 2026-02-15 12:00 |
19:18:39.01 |
+15:49:15.7 |
HIP 94894 |
8.42 |
| 2026-02-16 00:00 |
19:18:40.40 |
+15:49:27.2 |
HIP 94894 |
8.62 |
| 2026-02-16 12:00 |
19:18:41.78 |
+15:49:38.7 |
HIP 94894 |
8.82 |
| 2026-02-17 00:00 |
19:18:43.15 |
+15:49:50.4 |
HIP 94894 |
9.05 |
| 2026-02-17 12:00 |
19:18:44.51 |
+15:50:02.1 |
HIP 94894 |
9.28 |
| 2026-02-18 00:00 |
19:18:45.86 |
+15:50:13.9 |
HIP 94894 |
9.52 |
| 2026-02-18 12:00 |
19:18:47.20 |
+15:50:25.8 |
HIP 94894 |
9.77 |
| 2026-02-19 00:00 |
19:18:48.53 |
+15:50:37.8 |
HIP 94894 |
10.03 |
| 2026-02-19 12:00 |
19:18:49.85 |
+15:50:49.9 |
HIP 94894 |
10.30 |
| 2026-02-20 00:00 |
19:18:51.16 |
+15:51:02.1 |
HIP 94894 |
10.58 |
| 2026-02-20 12:00 |
19:18:52.46 |
+15:51:14.3 |
HIP 94894 |
10.86 |
| 2026-02-21 00:00 |
19:18:53.75 |
+15:51:26.6 |
HIP 94894 |
11.15 |
| 2026-02-21 12:00 |
19:18:55.03 |
+15:51:39.0 |
HIP 94894 |
11.45 |
| 2026-02-22 00:00 |
19:18:56.30 |
+15:51:51.5 |
HIP 94894 |
11.75 |
| 2026-02-22 12:00 |
19:18:57.56 |
+15:52:04.1 |
HIP 94894 |
12.05 |
| 2026-02-23 00:00 |
19:18:58.81 |
+15:52:16.8 |
HIP 94894 |
12.36 |
| 2026-02-23 12:00 |
19:19:00.05 |
+15:52:29.5 |
HIP 94894 |
12.67 |
| 2026-02-24 00:00 |
19:19:01.28 |
+15:52:42.3 |
HIP 94894 |
12.98 |