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) |
| 2026-09-20 00:00 |
05:56:48.64 |
+30:52:18.4 |
HIP 28157 |
15.92 |
| 2026-09-20 12:00 |
05:56:48.69 |
+30:52:21.2 |
HIP 28157 |
15.97 |
| 2026-09-21 00:00 |
05:56:48.72 |
+30:52:24.1 |
HIP 28157 |
16.01 |
| 2026-09-21 12:00 |
05:56:48.73 |
+30:52:26.9 |
HIP 28157 |
16.06 |
| 2026-09-22 00:00 |
05:56:48.73 |
+30:52:29.7 |
HIP 28157 |
16.10 |
| 2026-09-22 12:00 |
05:56:48.72 |
+30:52:32.5 |
HIP 28157 |
16.15 |
| 2026-09-23 00:00 |
05:56:48.69 |
+30:52:35.3 |
HIP 28157 |
16.20 |
| 2026-09-23 12:00 |
05:56:48.64 |
+30:52:38.1 |
HIP 28157 |
16.25 |
| 2026-09-24 00:00 |
05:56:48.58 |
+30:52:40.9 |
HIP 28157 |
16.30 |
| 2026-09-24 12:00 |
05:56:48.50 |
+30:52:43.7 |
HIP 28157 |
16.34 |
| 2026-09-25 00:00 |
05:56:48.41 |
+30:52:46.5 |
HIP 28157 |
16.39 |
| 2026-09-25 12:00 |
05:56:48.30 |
+30:52:49.3 |
HIP 28157 |
16.44 |
| 2026-09-26 00:00 |
05:56:48.18 |
+30:52:52.1 |
HIP 28157 |
16.49 |
| 2026-09-26 12:00 |
05:56:48.04 |
+30:52:54.9 |
HIP 28157 |
16.54 |
| 2026-09-27 00:00 |
05:56:47.88 |
+30:52:57.7 |
HIP 28157 |
16.60 |
| 2026-09-27 12:00 |
05:56:47.71 |
+30:53:00.5 |
HIP 28157 |
16.65 |
| 2026-09-28 00:00 |
05:56:47.53 |
+30:53:03.3 |
HIP 28157 |
16.70 |
| 2026-09-28 12:00 |
05:56:47.33 |
+30:53:06.1 |
HIP 28157 |
16.75 |
| 2026-09-29 00:00 |
05:56:47.11 |
+30:53:08.9 |
HIP 28157 |
16.81 |
| 2026-09-29 12:00 |
05:56:46.88 |
+30:53:11.7 |
HIP 28157 |
16.86 |
| 2026-09-30 00:00 |
05:56:46.63 |
+30:53:14.5 |
HIP 28157 |
16.92 |
| 2026-09-30 12:00 |
05:56:46.37 |
+30:53:17.3 |
HIP 28157 |
16.97 |
| 2026-10-01 00:00 |
05:56:46.09 |
+30:53:20.0 |
HIP 28157 |
17.03 |
| 2026-10-01 12:00 |
05:56:45.80 |
+30:53:22.8 |
HIP 28157 |
17.08 |
| 2026-10-02 00:00 |
05:56:45.49 |
+30:53:25.6 |
HIP 28157 |
17.14 |
| 2026-10-02 12:00 |
05:56:45.17 |
+30:53:28.3 |
HIP 28157 |
17.20 |
| 2026-10-03 00:00 |
05:56:44.83 |
+30:53:31.1 |
HIP 28157 |
17.26 |
| 2026-10-03 12:00 |
05:56:44.47 |
+30:53:33.8 |
HIP 28157 |
17.32 |
| 2026-10-04 00:00 |
05:56:44.10 |
+30:53:36.6 |
HIP 28157 |
17.38 |
| 2026-10-04 12:00 |
05:56:43.72 |
+30:53:39.3 |
HIP 28157 |
17.44 |
| 2026-10-05 00:00 |
05:56:43.32 |
+30:53:42.0 |
HIP 28157 |
17.50 |
| 2026-10-05 12:00 |
05:56:42.90 |
+30:53:44.8 |
HIP 28157 |
17.56 |
| 2026-10-06 00:00 |
05:56:42.47 |
+30:53:47.5 |
HIP 28157 |
17.63 |
| 2026-10-06 12:00 |
05:56:42.02 |
+30:53:50.2 |
HIP 28157 |
17.69 |
| 2026-10-07 00:00 |
05:56:41.56 |
+30:53:52.9 |
HIP 28157 |
17.76 |
| 2026-10-07 12:00 |
05:56:41.09 |
+30:53:55.6 |
HIP 28157 |
17.83 |
| 2026-10-08 00:00 |
05:56:40.59 |
+30:53:58.3 |
HIP 28022 |
17.78 |
| 2026-10-08 12:00 |
05:56:40.08 |
+30:54:01.0 |
HIP 28022 |
17.72 |
| 2026-10-09 00:00 |
05:56:39.56 |
+30:54:03.6 |
HIP 28022 |
17.66 |
| 2026-10-09 12:00 |
05:56:39.02 |
+30:54:06.3 |
HIP 28022 |
17.60 |
| 2026-10-10 00:00 |
05:56:38.47 |
+30:54:09.0 |
HIP 28022 |
17.54 |
| 2026-10-10 12:00 |
05:56:37.90 |
+30:54:11.6 |
HIP 28022 |
17.48 |
| 2026-10-11 00:00 |
05:56:37.32 |
+30:54:14.3 |
HIP 28022 |
17.41 |