メタデータ
| 項目 |
値 |
| Designation |
C/2005 P3 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-08-09T17:53:55.314240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:51Z |
| Obs used |
78 |
| NEO |
- |
| M1 |
13.000 |
| K1 |
9.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-09-05.0000000 |
| e |
0.98765964 |
| q (au) |
0.525760 |
| a (au) |
42.604934 |
| i (deg) |
89.706006 |
| Ω (om, deg) |
242.778577 |
| ω (w, deg) |
32.144830 |
| M (ma, deg) |
0.093049 |
等級
散乱 + 全体線形
$$
M_a = (11.682 + 2.791\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.682 |
| n |
2.791 |
| gf |
0.803 |
| 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) |
| 2026-09-20 00:00 |
04:25:58.39 |
-00:53:43.6 |
HIP 20725 |
24.15 |
| 2026-09-20 12:00 |
04:25:57.36 |
-00:54:04.2 |
HIP 20725 |
24.56 |
| 2026-09-21 00:00 |
04:25:56.29 |
-00:54:24.8 |
HIP 20725 |
24.97 |
| 2026-09-21 12:00 |
04:25:55.21 |
-00:54:45.4 |
HIP 20725 |
25.38 |
| 2026-09-22 00:00 |
04:25:54.09 |
-00:55:06.0 |
HIP 20725 |
25.79 |
| 2026-09-22 12:00 |
04:25:52.96 |
-00:55:26.6 |
HIP 20725 |
26.21 |
| 2026-09-23 00:00 |
04:25:51.79 |
-00:55:47.3 |
HIP 20725 |
26.63 |
| 2026-09-23 12:00 |
04:25:50.61 |
-00:56:07.9 |
HIP 20725 |
27.05 |
| 2026-09-24 00:00 |
04:25:49.39 |
-00:56:28.5 |
HIP 20725 |
27.48 |
| 2026-09-24 12:00 |
04:25:48.16 |
-00:56:49.1 |
HIP 20725 |
27.91 |
| 2026-09-25 00:00 |
04:25:46.89 |
-00:57:09.8 |
HIP 20667 |
27.55 |
| 2026-09-25 12:00 |
04:25:45.61 |
-00:57:30.4 |
HIP 20667 |
27.19 |
| 2026-09-26 00:00 |
04:25:44.30 |
-00:57:51.0 |
HIP 20667 |
26.83 |
| 2026-09-26 12:00 |
04:25:42.96 |
-00:58:11.6 |
HIP 20667 |
26.47 |
| 2026-09-27 00:00 |
04:25:41.60 |
-00:58:32.2 |
HIP 20667 |
26.12 |
| 2026-09-27 12:00 |
04:25:40.21 |
-00:58:52.9 |
HIP 20667 |
25.77 |
| 2026-09-28 00:00 |
04:25:38.81 |
-00:59:13.5 |
HIP 20667 |
25.43 |
| 2026-09-28 12:00 |
04:25:37.37 |
-00:59:34.0 |
HIP 20667 |
25.09 |
| 2026-09-29 00:00 |
04:25:35.91 |
-00:59:54.6 |
HIP 20667 |
24.76 |
| 2026-09-29 12:00 |
04:25:34.43 |
-01:00:15.2 |
HIP 20667 |
24.43 |
| 2026-09-30 00:00 |
04:25:32.93 |
-01:00:35.7 |
HIP 20667 |
24.11 |
| 2026-09-30 12:00 |
04:25:31.40 |
-01:00:56.3 |
HIP 20667 |
23.80 |
| 2026-10-01 00:00 |
04:25:29.84 |
-01:01:16.8 |
HIP 20667 |
23.50 |
| 2026-10-01 12:00 |
04:25:28.27 |
-01:01:37.3 |
HIP 20667 |
23.20 |
| 2026-10-02 00:00 |
04:25:26.67 |
-01:01:57.8 |
HIP 20667 |
22.92 |
| 2026-10-02 12:00 |
04:25:25.04 |
-01:02:18.3 |
HIP 20667 |
22.64 |
| 2026-10-03 00:00 |
04:25:23.39 |
-01:02:38.7 |
HIP 20667 |
22.38 |
| 2026-10-03 12:00 |
04:25:21.72 |
-01:02:59.1 |
HIP 20667 |
22.12 |
| 2026-10-04 00:00 |
04:25:20.03 |
-01:03:19.5 |
HIP 20667 |
21.88 |
| 2026-10-04 12:00 |
04:25:18.31 |
-01:03:39.9 |
HIP 20667 |
21.65 |
| 2026-10-05 00:00 |
04:25:16.57 |
-01:04:00.2 |
HIP 20667 |
21.44 |
| 2026-10-05 12:00 |
04:25:14.81 |
-01:04:20.5 |
HIP 20667 |
21.24 |
| 2026-10-06 00:00 |
04:25:13.02 |
-01:04:40.8 |
HIP 20667 |
21.05 |
| 2026-10-06 12:00 |
04:25:11.21 |
-01:05:01.0 |
HIP 20667 |
20.88 |
| 2026-10-07 00:00 |
04:25:09.38 |
-01:05:21.2 |
HIP 20667 |
20.72 |
| 2026-10-07 12:00 |
04:25:07.52 |
-01:05:41.4 |
HIP 20667 |
20.59 |
| 2026-10-08 00:00 |
04:25:05.65 |
-01:06:01.5 |
HIP 20667 |
20.47 |
| 2026-10-08 12:00 |
04:25:03.75 |
-01:06:21.6 |
HIP 20667 |
20.37 |
| 2026-10-09 00:00 |
04:25:01.82 |
-01:06:41.7 |
HIP 20667 |
20.29 |
| 2026-10-09 12:00 |
04:24:59.88 |
-01:07:01.7 |
HIP 20667 |
20.23 |
| 2026-10-10 00:00 |
04:24:57.92 |
-01:07:21.6 |
HIP 20667 |
20.19 |
| 2026-10-10 12:00 |
04:24:55.93 |
-01:07:41.5 |
HIP 20667 |
20.17 |
| 2026-10-11 00:00 |
04:24:53.92 |
-01:08:01.4 |
HIP 20667 |
20.17 |