メタデータ
| 項目 |
値 |
| Designation |
C/1979 M1 (Bradfield) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1979-07-23T06:18:13.374720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:27Z |
| Obs used |
25 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
35.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1979-08-03.0000000 |
| e |
1.00003214 |
| q (au) |
0.413217 |
| a (au) |
-12856.433853 |
| i (deg) |
136.228721 |
| Ω (om, deg) |
164.217096 |
| ω (w, deg) |
47.651179 |
| M (ma, deg) |
0.000007 |
等級
散乱 + 全体線形
$$
M_a = (11.901 + 5.224\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.901 |
| n |
5.224 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-07-29 00:00 |
21:45:20.70 |
-41:23:06.7 |
HIP 107453 |
10.83 |
| 2026-07-29 12:00 |
21:45:18.74 |
-41:23:17.2 |
HIP 107453 |
11.17 |
| 2026-07-30 00:00 |
21:45:16.78 |
-41:23:27.6 |
HIP 107453 |
11.51 |
| 2026-07-30 12:00 |
21:45:14.81 |
-41:23:37.9 |
HIP 107453 |
11.86 |
| 2026-07-31 00:00 |
21:45:12.84 |
-41:23:48.2 |
HIP 107453 |
12.21 |
| 2026-07-31 12:00 |
21:45:10.86 |
-41:23:58.4 |
HIP 107453 |
12.56 |
| 2026-08-01 00:00 |
21:45:08.88 |
-41:24:08.5 |
HIP 107453 |
12.92 |
| 2026-08-01 12:00 |
21:45:06.89 |
-41:24:18.6 |
HIP 107453 |
13.28 |
| 2026-08-02 00:00 |
21:45:04.90 |
-41:24:28.5 |
HIP 107453 |
13.64 |
| 2026-08-02 12:00 |
21:45:02.90 |
-41:24:38.4 |
HIP 107453 |
14.00 |
| 2026-08-03 00:00 |
21:45:00.90 |
-41:24:48.2 |
HIP 107453 |
14.36 |
| 2026-08-03 12:00 |
21:44:58.90 |
-41:24:57.9 |
HIP 107453 |
14.73 |
| 2026-08-04 00:00 |
21:44:56.89 |
-41:25:07.6 |
HIP 107453 |
15.10 |
| 2026-08-04 12:00 |
21:44:54.88 |
-41:25:17.1 |
HIP 107453 |
15.47 |
| 2026-08-05 00:00 |
21:44:52.86 |
-41:25:26.6 |
HIP 107453 |
15.84 |
| 2026-08-05 12:00 |
21:44:50.84 |
-41:25:36.0 |
HIP 107453 |
16.21 |
| 2026-08-06 00:00 |
21:44:48.81 |
-41:25:45.3 |
HIP 107453 |
16.59 |
| 2026-08-06 12:00 |
21:44:46.79 |
-41:25:54.5 |
HIP 107453 |
16.96 |
| 2026-08-07 00:00 |
21:44:44.76 |
-41:26:03.6 |
HIP 107453 |
17.34 |
| 2026-08-07 12:00 |
21:44:42.72 |
-41:26:12.7 |
HIP 107453 |
17.72 |
| 2026-08-08 00:00 |
21:44:40.69 |
-41:26:21.6 |
HIP 107453 |
18.09 |
| 2026-08-08 12:00 |
21:44:38.65 |
-41:26:30.5 |
HIP 107453 |
18.47 |
| 2026-08-09 00:00 |
21:44:36.60 |
-41:26:39.3 |
HIP 107453 |
18.85 |
| 2026-08-09 12:00 |
21:44:34.56 |
-41:26:48.0 |
HIP 107453 |
19.23 |
| 2026-08-10 00:00 |
21:44:32.51 |
-41:26:56.6 |
HIP 107453 |
19.61 |
| 2026-08-10 12:00 |
21:44:30.46 |
-41:27:05.1 |
HIP 107453 |
19.99 |
| 2026-08-11 00:00 |
21:44:28.41 |
-41:27:13.5 |
HIP 107453 |
20.37 |
| 2026-08-11 12:00 |
21:44:26.36 |
-41:27:21.8 |
HIP 107453 |
20.75 |
| 2026-08-12 00:00 |
21:44:24.30 |
-41:27:30.0 |
HIP 107453 |
21.14 |
| 2026-08-12 12:00 |
21:44:22.25 |
-41:27:38.2 |
HIP 107453 |
21.52 |
| 2026-08-13 00:00 |
21:44:20.19 |
-41:27:46.2 |
HIP 107453 |
21.90 |
| 2026-08-13 12:00 |
21:44:18.13 |
-41:27:54.1 |
HIP 107453 |
22.28 |
| 2026-08-14 00:00 |
21:44:16.07 |
-41:28:02.0 |
HIP 107453 |
22.66 |
| 2026-08-14 12:00 |
21:44:14.01 |
-41:28:09.7 |
HIP 107453 |
23.05 |
| 2026-08-15 00:00 |
21:44:11.95 |
-41:28:17.4 |
HIP 107453 |
23.43 |
| 2026-08-15 12:00 |
21:44:09.89 |
-41:28:24.9 |
HIP 107453 |
23.81 |
| 2026-08-16 00:00 |
21:44:07.82 |
-41:28:32.4 |
HIP 107453 |
24.19 |
| 2026-08-16 12:00 |
21:44:05.76 |
-41:28:39.7 |
HIP 107453 |
24.57 |
| 2026-08-17 00:00 |
21:44:03.70 |
-41:28:47.0 |
HIP 107453 |
24.96 |
| 2026-08-17 12:00 |
21:44:01.64 |
-41:28:54.2 |
HIP 107155 |
25.10 |
| 2026-08-18 00:00 |
21:43:59.57 |
-41:29:01.2 |
HIP 107155 |
24.89 |
| 2026-08-18 12:00 |
21:43:57.51 |
-41:29:08.2 |
HIP 107155 |
24.68 |
| 2026-08-19 00:00 |
21:43:55.45 |
-41:29:15.0 |
HIP 107155 |
24.47 |