メタデータ
| 項目 |
値 |
| Designation |
C/2004 V13 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2004-12-21T03:38:32.539200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:45Z |
| Obs used |
25 |
| NEO |
- |
| M1 |
15.000 |
| K1 |
15.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2005-01-03.0000000 |
| e |
0.99999462 |
| q (au) |
0.180856 |
| a (au) |
33639.443095 |
| i (deg) |
34.809752 |
| Ω (om, deg) |
207.699525 |
| ω (w, deg) |
92.690799 |
| M (ma, deg) |
0.000002 |
等級
散乱 + 全体線形
$$
M_a = (13.145 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.145 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
07:15:15.21 |
-11:54:57.5 |
HIP 35059 |
4.63 |
| 2026-07-29 12:00 |
07:15:17.77 |
-11:55:08.8 |
HIP 35059 |
5.26 |
| 2026-07-30 00:00 |
07:15:20.32 |
-11:55:20.3 |
HIP 35059 |
5.88 |
| 2026-07-30 12:00 |
07:15:22.87 |
-11:55:32.0 |
HIP 35059 |
6.52 |
| 2026-07-31 00:00 |
07:15:25.40 |
-11:55:43.8 |
HIP 35059 |
7.15 |
| 2026-07-31 12:00 |
07:15:27.93 |
-11:55:55.8 |
HIP 35059 |
7.79 |
| 2026-08-01 00:00 |
07:15:30.45 |
-11:56:07.9 |
HIP 35059 |
8.43 |
| 2026-08-01 12:00 |
07:15:32.97 |
-11:56:20.2 |
HIP 35059 |
9.07 |
| 2026-08-02 00:00 |
07:15:35.47 |
-11:56:32.7 |
HIP 35059 |
9.71 |
| 2026-08-02 12:00 |
07:15:37.97 |
-11:56:45.3 |
HIP 35059 |
10.35 |
| 2026-08-03 00:00 |
07:15:40.46 |
-11:56:58.1 |
HIP 35059 |
10.99 |
| 2026-08-03 12:00 |
07:15:42.94 |
-11:57:11.1 |
HIP 35059 |
11.63 |
| 2026-08-04 00:00 |
07:15:45.41 |
-11:57:24.2 |
HIP 35059 |
12.27 |
| 2026-08-04 12:00 |
07:15:47.87 |
-11:57:37.4 |
HIP 35059 |
12.91 |
| 2026-08-05 00:00 |
07:15:50.32 |
-11:57:50.9 |
HIP 35059 |
13.55 |
| 2026-08-05 12:00 |
07:15:52.77 |
-11:58:04.4 |
HIP 35059 |
14.19 |
| 2026-08-06 00:00 |
07:15:55.20 |
-11:58:18.2 |
HIP 35059 |
14.83 |
| 2026-08-06 12:00 |
07:15:57.63 |
-11:58:32.1 |
HIP 35059 |
15.46 |
| 2026-08-07 00:00 |
07:16:00.04 |
-11:58:46.1 |
HIP 35059 |
16.10 |
| 2026-08-07 12:00 |
07:16:02.45 |
-11:59:00.3 |
HIP 35261 |
16.06 |
| 2026-08-08 00:00 |
07:16:04.84 |
-11:59:14.6 |
HIP 35261 |
15.44 |
| 2026-08-08 12:00 |
07:16:07.23 |
-11:59:29.1 |
HIP 35261 |
14.83 |
| 2026-08-09 00:00 |
07:16:09.60 |
-11:59:43.8 |
HIP 35261 |
14.21 |
| 2026-08-09 12:00 |
07:16:11.97 |
-11:59:58.6 |
HIP 35261 |
13.60 |
| 2026-08-10 00:00 |
07:16:14.32 |
-12:00:13.5 |
HIP 35261 |
13.00 |
| 2026-08-10 12:00 |
07:16:16.66 |
-12:00:28.6 |
HIP 35261 |
12.40 |
| 2026-08-11 00:00 |
07:16:18.99 |
-12:00:43.8 |
HIP 35261 |
11.80 |
| 2026-08-11 12:00 |
07:16:21.31 |
-12:00:59.2 |
HIP 35261 |
11.21 |
| 2026-08-12 00:00 |
07:16:23.62 |
-12:01:14.8 |
HIP 35261 |
10.63 |
| 2026-08-12 12:00 |
07:16:25.92 |
-12:01:30.4 |
HIP 35261 |
10.05 |
| 2026-08-13 00:00 |
07:16:28.20 |
-12:01:46.2 |
HIP 35261 |
9.48 |
| 2026-08-13 12:00 |
07:16:30.48 |
-12:02:02.2 |
HIP 35261 |
8.92 |
| 2026-08-14 00:00 |
07:16:32.74 |
-12:02:18.3 |
HIP 35261 |
8.37 |
| 2026-08-14 12:00 |
07:16:34.99 |
-12:02:34.5 |
HIP 35261 |
7.84 |
| 2026-08-15 00:00 |
07:16:37.22 |
-12:02:50.9 |
HIP 35261 |
7.32 |
| 2026-08-15 12:00 |
07:16:39.44 |
-12:03:07.4 |
HIP 35261 |
6.82 |
| 2026-08-16 00:00 |
07:16:41.66 |
-12:03:24.1 |
HIP 35261 |
6.34 |
| 2026-08-16 12:00 |
07:16:43.85 |
-12:03:40.8 |
HIP 35261 |
5.89 |
| 2026-08-17 00:00 |
07:16:46.04 |
-12:03:57.8 |
HIP 35261 |
5.47 |
| 2026-08-17 12:00 |
07:16:48.21 |
-12:04:14.8 |
HIP 35261 |
5.09 |
| 2026-08-18 00:00 |
07:16:50.37 |
-12:04:32.0 |
HIP 35261 |
4.77 |
| 2026-08-18 12:00 |
07:16:52.51 |
-12:04:49.3 |
HIP 35261 |
4.50 |
| 2026-08-19 00:00 |
07:16:54.64 |
-12:05:06.7 |
HIP 35261 |
4.31 |