メタデータ
| 項目 |
値 |
| Designation |
C/2009 F6 (Yi-SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-05-07T10:24:24.171840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:30Z |
| Obs used |
487 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
13.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-05-22.0000000 |
| e |
0.99751434 |
| q (au) |
1.274159 |
| a (au) |
512.604406 |
| i (deg) |
85.764786 |
| Ω (om, deg) |
278.679026 |
| ω (w, deg) |
129.772327 |
| M (ma, deg) |
0.001237 |
等級
散乱 + 全体線形
$$
M_a = (9.977 + 4.261\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.977 |
| n |
4.261 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
05:43:52.40 |
-85:11:20.8 |
HIP 26932 |
17.33 |
| 2026-03-26 12:00 |
05:43:57.79 |
-85:10:36.0 |
HIP 26932 |
16.59 |
| 2026-03-27 00:00 |
05:44:03.49 |
-85:09:51.3 |
HIP 26932 |
15.86 |
| 2026-03-27 12:00 |
05:44:09.49 |
-85:09:06.6 |
HIP 26932 |
15.13 |
| 2026-03-28 00:00 |
05:44:15.80 |
-85:08:22.0 |
HIP 26932 |
14.40 |
| 2026-03-28 12:00 |
05:44:22.41 |
-85:07:37.5 |
HIP 26932 |
13.69 |
| 2026-03-29 00:00 |
05:44:29.31 |
-85:06:53.1 |
HIP 26932 |
12.97 |
| 2026-03-29 12:00 |
05:44:36.51 |
-85:06:08.7 |
HIP 26932 |
12.27 |
| 2026-03-30 00:00 |
05:44:44.01 |
-85:05:24.4 |
HIP 26932 |
11.58 |
| 2026-03-30 12:00 |
05:44:51.79 |
-85:04:40.2 |
HIP 26932 |
10.89 |
| 2026-03-31 00:00 |
05:44:59.86 |
-85:03:56.1 |
HIP 26932 |
10.22 |
| 2026-03-31 12:00 |
05:45:08.21 |
-85:03:12.1 |
HIP 26932 |
9.57 |
| 2026-04-01 00:00 |
05:45:16.84 |
-85:02:28.2 |
HIP 26932 |
8.94 |
| 2026-04-01 12:00 |
05:45:25.75 |
-85:01:44.4 |
HIP 26932 |
8.33 |
| 2026-04-02 00:00 |
05:45:34.93 |
-85:01:00.6 |
HIP 26932 |
7.75 |
| 2026-04-02 12:00 |
05:45:44.39 |
-85:00:17.0 |
HIP 26932 |
7.21 |
| 2026-04-03 00:00 |
05:45:54.12 |
-84:59:33.5 |
HIP 26932 |
6.72 |
| 2026-04-03 12:00 |
05:46:04.11 |
-84:58:50.1 |
HIP 26932 |
6.28 |
| 2026-04-04 00:00 |
05:46:14.38 |
-84:58:06.7 |
HIP 26932 |
5.92 |
| 2026-04-04 12:00 |
05:46:24.90 |
-84:57:23.5 |
HIP 26932 |
5.64 |
| 2026-04-05 00:00 |
05:46:35.68 |
-84:56:40.4 |
HIP 26932 |
5.47 |
| 2026-04-05 12:00 |
05:46:46.72 |
-84:55:57.5 |
HIP 26932 |
5.39 |
| 2026-04-06 00:00 |
05:46:58.02 |
-84:55:14.6 |
HIP 26932 |
5.44 |
| 2026-04-06 12:00 |
05:47:09.57 |
-84:54:31.9 |
HIP 26932 |
5.59 |
| 2026-04-07 00:00 |
05:47:21.37 |
-84:53:49.2 |
HIP 26932 |
5.84 |
| 2026-04-07 12:00 |
05:47:33.42 |
-84:53:06.7 |
HIP 26932 |
6.19 |
| 2026-04-08 00:00 |
05:47:45.71 |
-84:52:24.4 |
HIP 26932 |
6.60 |
| 2026-04-08 12:00 |
05:47:58.25 |
-84:51:42.1 |
HIP 26932 |
7.08 |
| 2026-04-09 00:00 |
05:48:11.03 |
-84:51:00.0 |
HIP 26932 |
7.62 |
| 2026-04-09 12:00 |
05:48:24.04 |
-84:50:18.0 |
HIP 26932 |
8.19 |
| 2026-04-10 00:00 |
05:48:37.30 |
-84:49:36.2 |
HIP 26932 |
8.79 |
| 2026-04-10 12:00 |
05:48:50.79 |
-84:48:54.5 |
HIP 26932 |
9.42 |
| 2026-04-11 00:00 |
05:49:04.51 |
-84:48:12.9 |
HIP 26932 |
10.07 |
| 2026-04-11 12:00 |
05:49:18.46 |
-84:47:31.4 |
HIP 26932 |
10.74 |
| 2026-04-12 00:00 |
05:49:32.64 |
-84:46:50.2 |
HIP 26932 |
11.43 |
| 2026-04-12 12:00 |
05:49:47.05 |
-84:46:09.0 |
HIP 26932 |
12.12 |
| 2026-04-13 00:00 |
05:50:01.68 |
-84:45:28.0 |
HIP 26932 |
12.83 |
| 2026-04-13 12:00 |
05:50:16.53 |
-84:44:47.2 |
HIP 26932 |
13.55 |
| 2026-04-14 00:00 |
05:50:31.60 |
-84:44:06.5 |
HIP 26932 |
14.27 |
| 2026-04-14 12:00 |
05:50:46.89 |
-84:43:26.0 |
HIP 26932 |
15.00 |
| 2026-04-15 00:00 |
05:51:02.40 |
-84:42:45.6 |
HIP 26932 |
15.73 |
| 2026-04-15 12:00 |
05:51:18.11 |
-84:42:05.4 |
HIP 26932 |
16.47 |
| 2026-04-16 00:00 |
05:51:34.04 |
-84:41:25.3 |
HIP 26932 |
17.21 |