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) |
| 2026-06-01 00:00 |
06:26:48.70 |
-83:54:53.1 |
HIP 30523 |
5.88 |
| 2026-06-01 12:00 |
06:27:16.51 |
-83:54:34.1 |
HIP 30523 |
6.04 |
| 2026-06-02 00:00 |
06:27:44.38 |
-83:54:15.3 |
HIP 30523 |
6.31 |
| 2026-06-02 12:00 |
06:28:12.32 |
-83:53:56.9 |
HIP 30523 |
6.67 |
| 2026-06-03 00:00 |
06:28:40.31 |
-83:53:38.7 |
HIP 30523 |
7.11 |
| 2026-06-03 12:00 |
06:29:08.37 |
-83:53:20.8 |
HIP 30523 |
7.61 |
| 2026-06-04 00:00 |
06:29:36.49 |
-83:53:03.1 |
HIP 30523 |
8.17 |
| 2026-06-04 12:00 |
06:30:04.67 |
-83:52:45.7 |
HIP 30523 |
8.77 |
| 2026-06-05 00:00 |
06:30:32.90 |
-83:52:28.6 |
HIP 30523 |
9.40 |
| 2026-06-05 12:00 |
06:31:01.20 |
-83:52:11.8 |
HIP 30523 |
10.07 |
| 2026-06-06 00:00 |
06:31:29.54 |
-83:51:55.2 |
HIP 30523 |
10.75 |
| 2026-06-06 12:00 |
06:31:57.95 |
-83:51:38.9 |
HIP 30523 |
11.46 |
| 2026-06-07 00:00 |
06:32:26.41 |
-83:51:22.9 |
HIP 30523 |
12.18 |
| 2026-06-07 12:00 |
06:32:54.92 |
-83:51:07.2 |
HIP 30523 |
12.91 |
| 2026-06-08 00:00 |
06:33:23.48 |
-83:50:51.7 |
HIP 30523 |
13.66 |
| 2026-06-08 12:00 |
06:33:52.10 |
-83:50:36.5 |
HIP 30523 |
14.41 |
| 2026-06-09 00:00 |
06:34:20.77 |
-83:50:21.6 |
HIP 30523 |
15.18 |
| 2026-06-09 12:00 |
06:34:49.48 |
-83:50:07.0 |
HIP 30523 |
15.95 |
| 2026-06-10 00:00 |
06:35:18.25 |
-83:49:52.6 |
HIP 30523 |
16.72 |
| 2026-06-10 12:00 |
06:35:47.06 |
-83:49:38.5 |
HIP 30523 |
17.50 |
| 2026-06-11 00:00 |
06:36:15.92 |
-83:49:24.7 |
HIP 30523 |
18.29 |
| 2026-06-11 12:00 |
06:36:44.83 |
-83:49:11.2 |
HIP 32435 |
18.28 |
| 2026-06-12 00:00 |
06:37:13.78 |
-83:48:58.0 |
HIP 32435 |
17.78 |
| 2026-06-12 12:00 |
06:37:42.77 |
-83:48:45.0 |
HIP 32435 |
17.30 |
| 2026-06-13 00:00 |
06:38:11.81 |
-83:48:32.3 |
HIP 32435 |
16.85 |
| 2026-06-13 12:00 |
06:38:40.89 |
-83:48:20.0 |
HIP 32435 |
16.41 |
| 2026-06-14 00:00 |
06:39:10.01 |
-83:48:07.9 |
HIP 32435 |
16.00 |
| 2026-06-14 12:00 |
06:39:39.17 |
-83:47:56.0 |
HIP 32435 |
15.61 |
| 2026-06-15 00:00 |
06:40:08.36 |
-83:47:44.5 |
HIP 32435 |
15.25 |
| 2026-06-15 12:00 |
06:40:37.60 |
-83:47:33.2 |
HIP 32435 |
14.92 |
| 2026-06-16 00:00 |
06:41:06.87 |
-83:47:22.3 |
HIP 32435 |
14.62 |
| 2026-06-16 12:00 |
06:41:36.17 |
-83:47:11.6 |
HIP 32435 |
14.35 |
| 2026-06-17 00:00 |
06:42:05.51 |
-83:47:01.2 |
HIP 32435 |
14.12 |
| 2026-06-17 12:00 |
06:42:34.88 |
-83:46:51.1 |
HIP 32435 |
13.92 |
| 2026-06-18 00:00 |
06:43:04.28 |
-83:46:41.3 |
HIP 32435 |
13.77 |
| 2026-06-18 12:00 |
06:43:33.72 |
-83:46:31.7 |
HIP 32435 |
13.65 |
| 2026-06-19 00:00 |
06:44:03.18 |
-83:46:22.5 |
HIP 32435 |
13.58 |
| 2026-06-19 12:00 |
06:44:32.67 |
-83:46:13.5 |
HIP 32435 |
13.54 |
| 2026-06-20 00:00 |
06:45:02.18 |
-83:46:04.9 |
HIP 32435 |
13.55 |
| 2026-06-20 12:00 |
06:45:31.73 |
-83:45:56.5 |
HIP 32435 |
13.60 |
| 2026-06-21 00:00 |
06:46:01.29 |
-83:45:48.4 |
HIP 32435 |
13.70 |
| 2026-06-21 12:00 |
06:46:30.88 |
-83:45:40.6 |
HIP 32435 |
13.83 |
| 2026-06-22 00:00 |
06:47:00.50 |
-83:45:33.1 |
HIP 32435 |
14.01 |