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) |
| 2026-09-20 00:00 |
21:41:51.62 |
-41:32:45.9 |
HIP 107096 |
6.23 |
| 2026-09-20 12:00 |
21:41:49.91 |
-41:32:45.5 |
HIP 107096 |
6.07 |
| 2026-09-21 00:00 |
21:41:48.22 |
-41:32:45.0 |
HIP 107096 |
5.92 |
| 2026-09-21 12:00 |
21:41:46.54 |
-41:32:44.3 |
HIP 107096 |
5.79 |
| 2026-09-22 00:00 |
21:41:44.86 |
-41:32:43.5 |
HIP 107096 |
5.68 |
| 2026-09-22 12:00 |
21:41:43.20 |
-41:32:42.6 |
HIP 107096 |
5.58 |
| 2026-09-23 00:00 |
21:41:41.55 |
-41:32:41.6 |
HIP 107096 |
5.50 |
| 2026-09-23 12:00 |
21:41:39.91 |
-41:32:40.5 |
HIP 107096 |
5.44 |
| 2026-09-24 00:00 |
21:41:38.28 |
-41:32:39.2 |
HIP 107096 |
5.40 |
| 2026-09-24 12:00 |
21:41:36.67 |
-41:32:37.9 |
HIP 107096 |
5.38 |
| 2026-09-25 00:00 |
21:41:35.06 |
-41:32:36.4 |
HIP 107096 |
5.38 |
| 2026-09-25 12:00 |
21:41:33.46 |
-41:32:34.8 |
HIP 107096 |
5.40 |
| 2026-09-26 00:00 |
21:41:31.88 |
-41:32:33.1 |
HIP 107096 |
5.43 |
| 2026-09-26 12:00 |
21:41:30.31 |
-41:32:31.3 |
HIP 107096 |
5.49 |
| 2026-09-27 00:00 |
21:41:28.75 |
-41:32:29.4 |
HIP 107096 |
5.55 |
| 2026-09-27 12:00 |
21:41:27.20 |
-41:32:27.4 |
HIP 107096 |
5.64 |
| 2026-09-28 00:00 |
21:41:25.66 |
-41:32:25.2 |
HIP 107096 |
5.74 |
| 2026-09-28 12:00 |
21:41:24.14 |
-41:32:22.9 |
HIP 107096 |
5.85 |
| 2026-09-29 00:00 |
21:41:22.62 |
-41:32:20.6 |
HIP 107096 |
5.98 |
| 2026-09-29 12:00 |
21:41:21.12 |
-41:32:18.1 |
HIP 107096 |
6.12 |
| 2026-09-30 00:00 |
21:41:19.64 |
-41:32:15.5 |
HIP 107096 |
6.27 |
| 2026-09-30 12:00 |
21:41:18.16 |
-41:32:12.7 |
HIP 107096 |
6.43 |
| 2026-10-01 00:00 |
21:41:16.70 |
-41:32:09.9 |
HIP 107096 |
6.59 |
| 2026-10-01 12:00 |
21:41:15.24 |
-41:32:07.0 |
HIP 107096 |
6.77 |
| 2026-10-02 00:00 |
21:41:13.81 |
-41:32:03.9 |
HIP 107096 |
6.95 |
| 2026-10-02 12:00 |
21:41:12.38 |
-41:32:00.7 |
HIP 107096 |
7.14 |
| 2026-10-03 00:00 |
21:41:10.97 |
-41:31:57.5 |
HIP 107096 |
7.33 |
| 2026-10-03 12:00 |
21:41:09.57 |
-41:31:54.1 |
HIP 107096 |
7.53 |
| 2026-10-04 00:00 |
21:41:08.18 |
-41:31:50.6 |
HIP 107096 |
7.73 |
| 2026-10-04 12:00 |
21:41:06.81 |
-41:31:46.9 |
HIP 107096 |
7.94 |
| 2026-10-05 00:00 |
21:41:05.45 |
-41:31:43.2 |
HIP 107096 |
8.15 |
| 2026-10-05 12:00 |
21:41:04.11 |
-41:31:39.4 |
HIP 107096 |
8.36 |
| 2026-10-06 00:00 |
21:41:02.77 |
-41:31:35.4 |
HIP 107096 |
8.57 |
| 2026-10-06 12:00 |
21:41:01.46 |
-41:31:31.4 |
HIP 107096 |
8.79 |
| 2026-10-07 00:00 |
21:41:00.15 |
-41:31:27.2 |
HIP 107096 |
9.01 |
| 2026-10-07 12:00 |
21:40:58.86 |
-41:31:22.9 |
HIP 107096 |
9.23 |
| 2026-10-08 00:00 |
21:40:57.59 |
-41:31:18.5 |
HIP 107096 |
9.45 |
| 2026-10-08 12:00 |
21:40:56.32 |
-41:31:14.0 |
HIP 107096 |
9.67 |
| 2026-10-09 00:00 |
21:40:55.08 |
-41:31:09.4 |
HIP 107096 |
9.89 |
| 2026-10-09 12:00 |
21:40:53.84 |
-41:31:04.7 |
HIP 107096 |
10.11 |
| 2026-10-10 00:00 |
21:40:52.63 |
-41:30:59.9 |
HIP 107096 |
10.33 |
| 2026-10-10 12:00 |
21:40:51.42 |
-41:30:55.0 |
HIP 107096 |
10.55 |
| 2026-10-11 00:00 |
21:40:50.23 |
-41:30:49.9 |
HIP 107096 |
10.78 |