メタデータ
| 項目 |
値 |
| Designation |
C/1975 V2 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1975-12-21T04:20:57.010560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:24Z |
| Obs used |
81 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
16.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1975-12-22.0000000 |
| e |
1.00001538 |
| q (au) |
0.218721 |
| a (au) |
-14217.185675 |
| i (deg) |
70.626160 |
| Ω (om, deg) |
271.312759 |
| ω (w, deg) |
358.089866 |
| M (ma, deg) |
0.000000 |
等級
散乱 + 全体線形
$$
M_a = (9.332 + 3.967\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.332 |
| n |
3.967 |
| gf |
0.800 |
| gb |
-0.640 |
| 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) |
| 2026-06-01 00:00 |
05:52:10.04 |
+30:47:04.8 |
HIP 27675 |
12.55 |
| 2026-06-01 12:00 |
05:52:11.73 |
+30:47:04.0 |
HIP 27675 |
12.78 |
| 2026-06-02 00:00 |
05:52:13.42 |
+30:47:03.2 |
HIP 27675 |
13.02 |
| 2026-06-02 12:00 |
05:52:15.11 |
+30:47:02.4 |
HIP 27675 |
13.26 |
| 2026-06-03 00:00 |
05:52:16.81 |
+30:47:01.7 |
HIP 27675 |
13.51 |
| 2026-06-03 12:00 |
05:52:18.51 |
+30:47:01.0 |
HIP 27675 |
13.77 |
| 2026-06-04 00:00 |
05:52:20.21 |
+30:47:00.3 |
HIP 27675 |
14.03 |
| 2026-06-04 12:00 |
05:52:21.92 |
+30:46:59.6 |
HIP 27675 |
14.30 |
| 2026-06-05 00:00 |
05:52:23.63 |
+30:46:59.0 |
HIP 27675 |
14.58 |
| 2026-06-05 12:00 |
05:52:25.34 |
+30:46:58.3 |
HIP 27675 |
14.86 |
| 2026-06-06 00:00 |
05:52:27.06 |
+30:46:57.7 |
HIP 27675 |
15.14 |
| 2026-06-06 12:00 |
05:52:28.79 |
+30:46:57.2 |
HIP 27675 |
15.43 |
| 2026-06-07 00:00 |
05:52:30.51 |
+30:46:56.6 |
HIP 27675 |
15.72 |
| 2026-06-07 12:00 |
05:52:32.24 |
+30:46:56.1 |
HIP 27675 |
16.02 |
| 2026-06-08 00:00 |
05:52:33.97 |
+30:46:55.6 |
HIP 27675 |
16.32 |
| 2026-06-08 12:00 |
05:52:35.71 |
+30:46:55.1 |
HIP 27825 |
16.52 |
| 2026-06-09 00:00 |
05:52:37.44 |
+30:46:54.6 |
HIP 27825 |
16.32 |
| 2026-06-09 12:00 |
05:52:39.18 |
+30:46:54.2 |
HIP 27825 |
16.12 |
| 2026-06-10 00:00 |
05:52:40.92 |
+30:46:53.8 |
HIP 27825 |
15.93 |
| 2026-06-10 12:00 |
05:52:42.67 |
+30:46:53.4 |
HIP 27825 |
15.75 |
| 2026-06-11 00:00 |
05:52:44.42 |
+30:46:53.0 |
HIP 27825 |
15.57 |
| 2026-06-11 12:00 |
05:52:46.17 |
+30:46:52.7 |
HIP 27825 |
15.40 |
| 2026-06-12 00:00 |
05:52:47.92 |
+30:46:52.3 |
HIP 27825 |
15.24 |
| 2026-06-12 12:00 |
05:52:49.67 |
+30:46:52.1 |
HIP 27825 |
15.09 |
| 2026-06-13 00:00 |
05:52:51.43 |
+30:46:51.8 |
HIP 27825 |
14.94 |
| 2026-06-13 12:00 |
05:52:53.18 |
+30:46:51.5 |
HIP 27825 |
14.80 |
| 2026-06-14 00:00 |
05:52:54.94 |
+30:46:51.3 |
HIP 27825 |
14.68 |
| 2026-06-14 12:00 |
05:52:56.70 |
+30:46:51.1 |
HIP 27825 |
14.56 |
| 2026-06-15 00:00 |
05:52:58.46 |
+30:46:50.9 |
HIP 27825 |
14.45 |
| 2026-06-15 12:00 |
05:53:00.22 |
+30:46:50.8 |
HIP 27825 |
14.35 |
| 2026-06-16 00:00 |
05:53:01.99 |
+30:46:50.6 |
HIP 27825 |
14.26 |
| 2026-06-16 12:00 |
05:53:03.75 |
+30:46:50.5 |
HIP 27825 |
14.18 |
| 2026-06-17 00:00 |
05:53:05.52 |
+30:46:50.4 |
HIP 27825 |
14.10 |
| 2026-06-17 12:00 |
05:53:07.28 |
+30:46:50.4 |
HIP 27825 |
14.04 |
| 2026-06-18 00:00 |
05:53:09.05 |
+30:46:50.3 |
HIP 27825 |
13.99 |
| 2026-06-18 12:00 |
05:53:10.81 |
+30:46:50.3 |
HIP 27825 |
13.95 |
| 2026-06-19 00:00 |
05:53:12.58 |
+30:46:50.3 |
HIP 27825 |
13.93 |
| 2026-06-19 12:00 |
05:53:14.35 |
+30:46:50.3 |
HIP 27825 |
13.91 |
| 2026-06-20 00:00 |
05:53:16.11 |
+30:46:50.4 |
HIP 27825 |
13.90 |
| 2026-06-20 12:00 |
05:53:17.88 |
+30:46:50.4 |
HIP 27825 |
13.90 |
| 2026-06-21 00:00 |
05:53:19.65 |
+30:46:50.5 |
HIP 27825 |
13.92 |
| 2026-06-21 12:00 |
05:53:21.41 |
+30:46:50.7 |
HIP 27825 |
13.94 |
| 2026-06-22 00:00 |
05:53:23.18 |
+30:46:50.8 |
HIP 27825 |
13.98 |