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) |
| 2026-03-26 00:00 |
07:08:04.20 |
-12:35:58.5 |
HIP 34454 |
18.49 |
| 2026-03-26 12:00 |
07:08:03.70 |
-12:35:34.4 |
HIP 34454 |
18.91 |
| 2026-03-27 00:00 |
07:08:03.22 |
-12:35:10.2 |
HIP 34344 |
18.63 |
| 2026-03-27 12:00 |
07:08:02.76 |
-12:34:46.1 |
HIP 34344 |
18.26 |
| 2026-03-28 00:00 |
07:08:02.33 |
-12:34:22.1 |
HIP 34344 |
17.90 |
| 2026-03-28 12:00 |
07:08:01.93 |
-12:33:58.0 |
HIP 34344 |
17.55 |
| 2026-03-29 00:00 |
07:08:01.55 |
-12:33:33.9 |
HIP 34344 |
17.21 |
| 2026-03-29 12:00 |
07:08:01.19 |
-12:33:09.9 |
HIP 34344 |
16.87 |
| 2026-03-30 00:00 |
07:08:00.85 |
-12:32:45.9 |
HIP 34344 |
16.54 |
| 2026-03-30 12:00 |
07:08:00.54 |
-12:32:21.9 |
HIP 34344 |
16.22 |
| 2026-03-31 00:00 |
07:08:00.26 |
-12:31:57.9 |
HIP 34344 |
15.91 |
| 2026-03-31 12:00 |
07:08:00.00 |
-12:31:33.9 |
HIP 34344 |
15.61 |
| 2026-04-01 00:00 |
07:07:59.76 |
-12:31:10.0 |
HIP 34344 |
15.31 |
| 2026-04-01 12:00 |
07:07:59.55 |
-12:30:46.1 |
HIP 34344 |
15.03 |
| 2026-04-02 00:00 |
07:07:59.36 |
-12:30:22.2 |
HIP 34344 |
14.76 |
| 2026-04-02 12:00 |
07:07:59.19 |
-12:29:58.4 |
HIP 34344 |
14.50 |
| 2026-04-03 00:00 |
07:07:59.05 |
-12:29:34.6 |
HIP 34344 |
14.25 |
| 2026-04-03 12:00 |
07:07:58.94 |
-12:29:10.8 |
HIP 34344 |
14.01 |
| 2026-04-04 00:00 |
07:07:58.84 |
-12:28:47.0 |
HIP 34344 |
13.78 |
| 2026-04-04 12:00 |
07:07:58.77 |
-12:28:23.3 |
HIP 34344 |
13.57 |
| 2026-04-05 00:00 |
07:07:58.73 |
-12:27:59.6 |
HIP 34344 |
13.37 |
| 2026-04-05 12:00 |
07:07:58.71 |
-12:27:36.0 |
HIP 34344 |
13.19 |
| 2026-04-06 00:00 |
07:07:58.71 |
-12:27:12.4 |
HIP 34344 |
13.02 |
| 2026-04-06 12:00 |
07:07:58.74 |
-12:26:48.9 |
HIP 34344 |
12.87 |
| 2026-04-07 00:00 |
07:07:58.79 |
-12:26:25.4 |
HIP 34344 |
12.73 |
| 2026-04-07 12:00 |
07:07:58.87 |
-12:26:01.9 |
HIP 34344 |
12.61 |
| 2026-04-08 00:00 |
07:07:58.96 |
-12:25:38.5 |
HIP 34344 |
12.50 |
| 2026-04-08 12:00 |
07:07:59.09 |
-12:25:15.2 |
HIP 34344 |
12.42 |
| 2026-04-09 00:00 |
07:07:59.23 |
-12:24:51.8 |
HIP 34344 |
12.35 |
| 2026-04-09 12:00 |
07:07:59.40 |
-12:24:28.6 |
HIP 34344 |
12.30 |
| 2026-04-10 00:00 |
07:07:59.60 |
-12:24:05.4 |
HIP 34344 |
12.26 |
| 2026-04-10 12:00 |
07:07:59.82 |
-12:23:42.3 |
HIP 34344 |
12.25 |
| 2026-04-11 00:00 |
07:08:00.06 |
-12:23:19.2 |
HIP 34344 |
12.25 |
| 2026-04-11 12:00 |
07:08:00.33 |
-12:22:56.2 |
HIP 34344 |
12.27 |
| 2026-04-12 00:00 |
07:08:00.62 |
-12:22:33.2 |
HIP 34344 |
12.31 |
| 2026-04-12 12:00 |
07:08:00.93 |
-12:22:10.3 |
HIP 34344 |
12.37 |
| 2026-04-13 00:00 |
07:08:01.27 |
-12:21:47.5 |
HIP 34344 |
12.45 |
| 2026-04-13 12:00 |
07:08:01.63 |
-12:21:24.7 |
HIP 34344 |
12.54 |
| 2026-04-14 00:00 |
07:08:02.01 |
-12:21:02.0 |
HIP 34344 |
12.65 |
| 2026-04-14 12:00 |
07:08:02.42 |
-12:20:39.4 |
HIP 34344 |
12.78 |
| 2026-04-15 00:00 |
07:08:02.85 |
-12:20:16.8 |
HIP 34344 |
12.92 |
| 2026-04-15 12:00 |
07:08:03.30 |
-12:19:54.3 |
HIP 34504 |
12.98 |
| 2026-04-16 00:00 |
07:08:03.78 |
-12:19:31.9 |
HIP 34504 |
12.85 |