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) |
| 2026-07-29 00:00 |
04:25:23.06 |
-00:22:55.0 |
HIP 20725 |
17.80 |
| 2026-07-29 12:00 |
04:25:24.66 |
-00:23:07.3 |
HIP 20725 |
17.35 |
| 2026-07-30 00:00 |
04:25:26.24 |
-00:23:19.7 |
HIP 20725 |
16.90 |
| 2026-07-30 12:00 |
04:25:27.79 |
-00:23:32.3 |
HIP 20725 |
16.46 |
| 2026-07-31 00:00 |
04:25:29.32 |
-00:23:45.0 |
HIP 20725 |
16.02 |
| 2026-07-31 12:00 |
04:25:30.84 |
-00:23:57.8 |
HIP 20725 |
15.59 |
| 2026-08-01 00:00 |
04:25:32.33 |
-00:24:10.7 |
HIP 20725 |
15.16 |
| 2026-08-01 12:00 |
04:25:33.79 |
-00:24:23.7 |
HIP 20725 |
14.74 |
| 2026-08-02 00:00 |
04:25:35.24 |
-00:24:36.9 |
HIP 20725 |
14.32 |
| 2026-08-02 12:00 |
04:25:36.67 |
-00:24:50.2 |
HIP 20725 |
13.90 |
| 2026-08-03 00:00 |
04:25:38.07 |
-00:25:03.6 |
HIP 20725 |
13.49 |
| 2026-08-03 12:00 |
04:25:39.45 |
-00:25:17.2 |
HIP 20725 |
13.08 |
| 2026-08-04 00:00 |
04:25:40.81 |
-00:25:30.8 |
HIP 20725 |
12.68 |
| 2026-08-04 12:00 |
04:25:42.15 |
-00:25:44.6 |
HIP 20725 |
12.28 |
| 2026-08-05 00:00 |
04:25:43.46 |
-00:25:58.5 |
HIP 20725 |
11.89 |
| 2026-08-05 12:00 |
04:25:44.75 |
-00:26:12.6 |
HIP 20725 |
11.50 |
| 2026-08-06 00:00 |
04:25:46.02 |
-00:26:26.7 |
HIP 20725 |
11.11 |
| 2026-08-06 12:00 |
04:25:47.27 |
-00:26:41.0 |
HIP 20725 |
10.73 |
| 2026-08-07 00:00 |
04:25:48.49 |
-00:26:55.4 |
HIP 20725 |
10.36 |
| 2026-08-07 12:00 |
04:25:49.69 |
-00:27:09.9 |
HIP 20725 |
10.00 |
| 2026-08-08 00:00 |
04:25:50.87 |
-00:27:24.5 |
HIP 20725 |
9.64 |
| 2026-08-08 12:00 |
04:25:52.03 |
-00:27:39.2 |
HIP 20725 |
9.28 |
| 2026-08-09 00:00 |
04:25:53.16 |
-00:27:54.1 |
HIP 20725 |
8.93 |
| 2026-08-09 12:00 |
04:25:54.26 |
-00:28:09.0 |
HIP 20725 |
8.60 |
| 2026-08-10 00:00 |
04:25:55.35 |
-00:28:24.1 |
HIP 20725 |
8.26 |
| 2026-08-10 12:00 |
04:25:56.41 |
-00:28:39.3 |
HIP 20725 |
7.94 |
| 2026-08-11 00:00 |
04:25:57.44 |
-00:28:54.6 |
HIP 20725 |
7.63 |
| 2026-08-11 12:00 |
04:25:58.46 |
-00:29:10.0 |
HIP 20725 |
7.33 |
| 2026-08-12 00:00 |
04:25:59.45 |
-00:29:25.6 |
HIP 20725 |
7.03 |
| 2026-08-12 12:00 |
04:26:00.41 |
-00:29:41.2 |
HIP 20725 |
6.75 |
| 2026-08-13 00:00 |
04:26:01.35 |
-00:29:56.9 |
HIP 20725 |
6.49 |
| 2026-08-13 12:00 |
04:26:02.27 |
-00:30:12.8 |
HIP 20725 |
6.23 |
| 2026-08-14 00:00 |
04:26:03.16 |
-00:30:28.7 |
HIP 20725 |
6.00 |
| 2026-08-14 12:00 |
04:26:04.03 |
-00:30:44.8 |
HIP 20725 |
5.78 |
| 2026-08-15 00:00 |
04:26:04.87 |
-00:31:01.0 |
HIP 20725 |
5.58 |
| 2026-08-15 12:00 |
04:26:05.69 |
-00:31:17.2 |
HIP 20725 |
5.40 |
| 2026-08-16 00:00 |
04:26:06.48 |
-00:31:33.6 |
HIP 20725 |
5.24 |
| 2026-08-16 12:00 |
04:26:07.25 |
-00:31:50.0 |
HIP 20725 |
5.11 |
| 2026-08-17 00:00 |
04:26:07.99 |
-00:32:06.6 |
HIP 20725 |
5.00 |
| 2026-08-17 12:00 |
04:26:08.71 |
-00:32:23.3 |
HIP 20725 |
4.92 |
| 2026-08-18 00:00 |
04:26:09.41 |
-00:32:40.0 |
HIP 20725 |
4.86 |
| 2026-08-18 12:00 |
04:26:10.07 |
-00:32:56.9 |
HIP 20725 |
4.84 |
| 2026-08-19 00:00 |
04:26:10.72 |
-00:33:13.8 |
HIP 20725 |
4.84 |