C/2009 F6 (Yi-SWAN)
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
$$
M_a = (9.991 + 4.249\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.991 |
| n |
4.249 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-02-03 00:00 |
06:10:36.13 |
-86:21:14.2 |
HIP 27734 |
17.52 |
| 2026-02-03 12:00 |
06:09:56.16 |
-86:20:45.1 |
HIP 27734 |
16.99 |
| 2026-02-04 00:00 |
06:09:16.67 |
-86:20:15.5 |
HIP 27734 |
16.48 |
| 2026-02-04 12:00 |
06:08:37.67 |
-86:19:45.5 |
HIP 27734 |
16.01 |
| 2026-02-05 00:00 |
06:07:59.16 |
-86:19:15.1 |
HIP 27734 |
15.57 |
| 2026-02-05 12:00 |
06:07:21.15 |
-86:18:44.3 |
HIP 27734 |
15.16 |
| 2026-02-06 00:00 |
06:06:43.63 |
-86:18:13.1 |
HIP 27734 |
14.80 |
| 2026-02-06 12:00 |
06:06:06.61 |
-86:17:41.5 |
HIP 27734 |
14.47 |
| 2026-02-07 00:00 |
06:05:30.08 |
-86:17:09.5 |
HIP 27734 |
14.19 |
| 2026-02-07 12:00 |
06:04:54.06 |
-86:16:37.1 |
HIP 27734 |
13.96 |
| 2026-02-08 00:00 |
06:04:18.55 |
-86:16:04.4 |
HIP 27734 |
13.77 |
| 2026-02-08 12:00 |
06:03:43.54 |
-86:15:31.3 |
HIP 27734 |
13.64 |
| 2026-02-09 00:00 |
06:03:09.04 |
-86:14:57.8 |
HIP 27734 |
13.55 |
| 2026-02-09 12:00 |
06:02:35.04 |
-86:14:24.0 |
HIP 27734 |
13.53 |
| 2026-02-10 00:00 |
06:02:01.56 |
-86:13:49.8 |
HIP 27734 |
13.55 |
| 2026-02-10 12:00 |
06:01:28.58 |
-86:13:15.3 |
HIP 27710 |
12.89 |
| 2026-02-11 00:00 |
06:00:56.12 |
-86:12:40.4 |
HIP 27710 |
12.11 |
| 2026-02-11 12:00 |
06:00:24.18 |
-86:12:05.2 |
HIP 27710 |
11.32 |
| 2026-02-12 00:00 |
05:59:52.74 |
-86:11:29.7 |
HIP 27710 |
10.54 |
| 2026-02-12 12:00 |
05:59:21.82 |
-86:10:53.8 |
HIP 27710 |
9.76 |
| 2026-02-13 00:00 |
05:58:51.42 |
-86:10:17.6 |
HIP 27710 |
8.99 |
| 2026-02-13 12:00 |
05:58:21.53 |
-86:09:41.1 |
HIP 27710 |
8.22 |
| 2026-02-14 00:00 |
05:57:52.16 |
-86:09:04.3 |
HIP 27710 |
7.45 |
| 2026-02-14 12:00 |
05:57:23.30 |
-86:08:27.2 |
HIP 27710 |
6.70 |
| 2026-02-15 00:00 |
05:56:54.96 |
-86:07:49.9 |
HIP 27710 |
5.95 |
| 2026-02-15 12:00 |
05:56:27.13 |
-86:07:12.2 |
HIP 27710 |
5.22 |
| 2026-02-16 00:00 |
05:55:59.82 |
-86:06:34.2 |
HIP 27710 |
4.51 |
| 2026-02-16 12:00 |
05:55:33.02 |
-86:05:56.0 |
HIP 27710 |
3.83 |
| 2026-02-17 00:00 |
05:55:06.74 |
-86:05:17.5 |
HIP 27710 |
3.21 |
| 2026-02-17 12:00 |
05:54:40.96 |
-86:04:38.7 |
HIP 27710 |
2.68 |
| 2026-02-18 00:00 |
05:54:15.70 |
-86:03:59.7 |
HIP 27710 |
2.31 |
| 2026-02-18 12:00 |
05:53:50.96 |
-86:03:20.4 |
HIP 27710 |
2.17 |
| 2026-02-19 00:00 |
05:53:26.72 |
-86:02:40.9 |
HIP 27710 |
2.31 |
| 2026-02-19 12:00 |
05:53:02.99 |
-86:02:01.1 |
HIP 27710 |
2.69 |
| 2026-02-20 00:00 |
05:52:39.76 |
-86:01:21.1 |
HIP 27710 |
3.22 |
| 2026-02-20 12:00 |
05:52:17.05 |
-86:00:40.9 |
HIP 27710 |
3.84 |
| 2026-02-21 00:00 |
05:51:54.83 |
-86:00:00.4 |
HIP 27710 |
4.51 |
| 2026-02-21 12:00 |
05:51:33.12 |
-85:59:19.7 |
HIP 27710 |
5.21 |
| 2026-02-22 00:00 |
05:51:11.91 |
-85:58:38.8 |
HIP 27710 |
5.93 |
| 2026-02-22 12:00 |
05:50:51.20 |
-85:57:57.7 |
HIP 27710 |
6.67 |
| 2026-02-23 00:00 |
05:50:30.99 |
-85:57:16.4 |
HIP 27710 |
7.42 |
| 2026-02-23 12:00 |
05:50:11.26 |
-85:56:35.0 |
HIP 27710 |
8.17 |
| 2026-02-24 00:00 |
05:49:52.03 |
-85:55:53.3 |
HIP 27710 |
8.93 |