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) |
| 2026-03-26 00:00 |
21:46:42.58 |
-40:39:40.7 |
HIP 107565 |
19.60 |
| 2026-03-26 12:00 |
21:46:44.11 |
-40:39:42.6 |
HIP 107565 |
19.49 |
| 2026-03-27 00:00 |
21:46:45.63 |
-40:39:44.7 |
HIP 107565 |
19.39 |
| 2026-03-27 12:00 |
21:46:47.14 |
-40:39:46.9 |
HIP 107565 |
19.29 |
| 2026-03-28 00:00 |
21:46:48.64 |
-40:39:49.1 |
HIP 107565 |
19.19 |
| 2026-03-28 12:00 |
21:46:50.12 |
-40:39:51.5 |
HIP 107565 |
19.10 |
| 2026-03-29 00:00 |
21:46:51.60 |
-40:39:54.0 |
HIP 107565 |
19.01 |
| 2026-03-29 12:00 |
21:46:53.06 |
-40:39:56.6 |
HIP 107565 |
18.92 |
| 2026-03-30 00:00 |
21:46:54.51 |
-40:39:59.4 |
HIP 107565 |
18.83 |
| 2026-03-30 12:00 |
21:46:55.95 |
-40:40:02.2 |
HIP 107565 |
18.74 |
| 2026-03-31 00:00 |
21:46:57.38 |
-40:40:05.1 |
HIP 107565 |
18.66 |
| 2026-03-31 12:00 |
21:46:58.79 |
-40:40:08.2 |
HIP 107565 |
18.58 |
| 2026-04-01 00:00 |
21:47:00.19 |
-40:40:11.4 |
HIP 107565 |
18.50 |
| 2026-04-01 12:00 |
21:47:01.58 |
-40:40:14.6 |
HIP 107565 |
18.42 |
| 2026-04-02 00:00 |
21:47:02.96 |
-40:40:18.0 |
HIP 107565 |
18.35 |
| 2026-04-02 12:00 |
21:47:04.33 |
-40:40:21.5 |
HIP 107565 |
18.27 |
| 2026-04-03 00:00 |
21:47:05.68 |
-40:40:25.1 |
HIP 107565 |
18.20 |
| 2026-04-03 12:00 |
21:47:07.02 |
-40:40:28.8 |
HIP 107565 |
18.13 |
| 2026-04-04 00:00 |
21:47:08.35 |
-40:40:32.7 |
HIP 107565 |
18.07 |
| 2026-04-04 12:00 |
21:47:09.66 |
-40:40:36.6 |
HIP 107565 |
18.00 |
| 2026-04-05 00:00 |
21:47:10.96 |
-40:40:40.6 |
HIP 107565 |
17.93 |
| 2026-04-05 12:00 |
21:47:12.25 |
-40:40:44.8 |
HIP 107565 |
17.87 |
| 2026-04-06 00:00 |
21:47:13.53 |
-40:40:49.0 |
HIP 107565 |
17.81 |
| 2026-04-06 12:00 |
21:47:14.79 |
-40:40:53.4 |
HIP 107565 |
17.75 |
| 2026-04-07 00:00 |
21:47:16.04 |
-40:40:57.9 |
HIP 107565 |
17.69 |
| 2026-04-07 12:00 |
21:47:17.27 |
-40:41:02.4 |
HIP 107565 |
17.63 |
| 2026-04-08 00:00 |
21:47:18.49 |
-40:41:07.1 |
HIP 107565 |
17.57 |
| 2026-04-08 12:00 |
21:47:19.70 |
-40:41:11.9 |
HIP 107565 |
17.52 |
| 2026-04-09 00:00 |
21:47:20.90 |
-40:41:16.8 |
HIP 107565 |
17.46 |
| 2026-04-09 12:00 |
21:47:22.08 |
-40:41:21.8 |
HIP 107565 |
17.41 |
| 2026-04-10 00:00 |
21:47:23.24 |
-40:41:26.9 |
HIP 107565 |
17.36 |
| 2026-04-10 12:00 |
21:47:24.40 |
-40:41:32.1 |
HIP 107565 |
17.31 |
| 2026-04-11 00:00 |
21:47:25.53 |
-40:41:37.5 |
HIP 107565 |
17.26 |
| 2026-04-11 12:00 |
21:47:26.66 |
-40:41:42.9 |
HIP 107565 |
17.21 |
| 2026-04-12 00:00 |
21:47:27.77 |
-40:41:48.4 |
HIP 107565 |
17.16 |
| 2026-04-12 12:00 |
21:47:28.87 |
-40:41:54.0 |
HIP 107565 |
17.11 |
| 2026-04-13 00:00 |
21:47:29.95 |
-40:41:59.8 |
HIP 107565 |
17.06 |
| 2026-04-13 12:00 |
21:47:31.01 |
-40:42:05.6 |
HIP 107565 |
17.01 |
| 2026-04-14 00:00 |
21:47:32.07 |
-40:42:11.6 |
HIP 107565 |
16.97 |
| 2026-04-14 12:00 |
21:47:33.11 |
-40:42:17.6 |
HIP 107565 |
16.92 |
| 2026-04-15 00:00 |
21:47:34.13 |
-40:42:23.8 |
HIP 107565 |
16.87 |
| 2026-04-15 12:00 |
21:47:35.14 |
-40:42:30.0 |
HIP 107565 |
16.83 |
| 2026-04-16 00:00 |
21:47:36.13 |
-40:42:36.4 |
HIP 107565 |
16.78 |