メタデータ
| 項目 |
値 |
| Designation |
C/2015 C2 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-04T13:33:59.673600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:06Z |
| Obs used |
151 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-04-26.0000000 |
| e |
0.99851030 |
| q (au) |
0.711377 |
| a (au) |
477.531702 |
| i (deg) |
94.501074 |
| Ω (om, deg) |
49.529700 |
| ω (w, deg) |
334.134062 |
| M (ma, deg) |
0.004952 |
等級
散乱 + 全体線形
$$
M_a = (14.217 + 3.643\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.217 |
| n |
3.643 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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) |
| 2026-03-26 00:00 |
16:17:28.77 |
+24:35:51.3 |
HIP 79930 |
20.23 |
| 2026-03-26 12:00 |
16:17:26.37 |
+24:36:34.6 |
HIP 79930 |
21.01 |
| 2026-03-27 00:00 |
16:17:23.93 |
+24:37:17.9 |
HIP 79930 |
21.80 |
| 2026-03-27 12:00 |
16:17:21.45 |
+24:38:01.0 |
HIP 79930 |
22.61 |
| 2026-03-28 00:00 |
16:17:18.94 |
+24:38:43.9 |
HIP 79930 |
23.44 |
| 2026-03-28 12:00 |
16:17:16.39 |
+24:39:26.7 |
HIP 79930 |
24.27 |
| 2026-03-29 00:00 |
16:17:13.81 |
+24:40:09.3 |
HIP 79930 |
25.12 |
| 2026-03-29 12:00 |
16:17:11.18 |
+24:40:51.8 |
HIP 79930 |
25.98 |
| 2026-03-30 00:00 |
16:17:08.53 |
+24:41:34.1 |
HIP 79930 |
26.85 |
| 2026-03-30 12:00 |
16:17:05.83 |
+24:42:16.3 |
HIP 79930 |
27.73 |
| 2026-03-31 00:00 |
16:17:03.10 |
+24:42:58.3 |
HIP 79930 |
28.62 |
| 2026-03-31 12:00 |
16:17:00.34 |
+24:43:40.1 |
HIP 79639 |
28.39 |
| 2026-04-01 00:00 |
16:16:57.54 |
+24:44:21.8 |
HIP 79639 |
28.12 |
| 2026-04-01 12:00 |
16:16:54.70 |
+24:45:03.2 |
HIP 79639 |
27.87 |
| 2026-04-02 00:00 |
16:16:51.83 |
+24:45:44.5 |
HIP 79639 |
27.65 |
| 2026-04-02 12:00 |
16:16:48.93 |
+24:46:25.6 |
HIP 79639 |
27.44 |
| 2026-04-03 00:00 |
16:16:45.99 |
+24:47:06.6 |
HIP 79639 |
27.27 |
| 2026-04-03 12:00 |
16:16:43.02 |
+24:47:47.3 |
HIP 79639 |
27.11 |
| 2026-04-04 00:00 |
16:16:40.01 |
+24:48:27.8 |
HIP 79639 |
26.98 |
| 2026-04-04 12:00 |
16:16:36.97 |
+24:49:08.2 |
HIP 79639 |
26.88 |
| 2026-04-05 00:00 |
16:16:33.89 |
+24:49:48.3 |
HIP 79639 |
26.80 |
| 2026-04-05 12:00 |
16:16:30.79 |
+24:50:28.3 |
HIP 79639 |
26.75 |
| 2026-04-06 00:00 |
16:16:27.65 |
+24:51:08.0 |
HIP 79639 |
26.73 |
| 2026-04-06 12:00 |
16:16:24.47 |
+24:51:47.5 |
HIP 79639 |
26.74 |
| 2026-04-07 00:00 |
16:16:21.27 |
+24:52:26.8 |
HIP 79639 |
26.77 |
| 2026-04-07 12:00 |
16:16:18.03 |
+24:53:05.9 |
HIP 79639 |
26.83 |
| 2026-04-08 00:00 |
16:16:14.76 |
+24:53:44.8 |
HIP 79639 |
26.93 |
| 2026-04-08 12:00 |
16:16:11.45 |
+24:54:23.5 |
HIP 79639 |
27.05 |
| 2026-04-09 00:00 |
16:16:08.12 |
+24:55:01.9 |
HIP 79639 |
27.19 |
| 2026-04-09 12:00 |
16:16:04.75 |
+24:55:40.1 |
HIP 79639 |
27.37 |
| 2026-04-10 00:00 |
16:16:01.35 |
+24:56:18.1 |
HIP 79639 |
27.58 |
| 2026-04-10 12:00 |
16:15:57.92 |
+24:56:55.8 |
HIP 79639 |
27.81 |
| 2026-04-11 00:00 |
16:15:54.47 |
+24:57:33.3 |
HIP 79639 |
28.07 |
| 2026-04-11 12:00 |
16:15:50.98 |
+24:58:10.5 |
HIP 79639 |
28.36 |
| 2026-04-12 00:00 |
16:15:47.45 |
+24:58:47.5 |
HIP 79639 |
28.67 |
| 2026-04-12 12:00 |
16:15:43.90 |
+24:59:24.3 |
HIP 79639 |
29.01 |
| 2026-04-13 00:00 |
16:15:40.32 |
+25:00:00.8 |
HIP 79639 |
29.38 |
| 2026-04-13 12:00 |
16:15:36.71 |
+25:00:37.0 |
HIP 79639 |
29.77 |
| 2026-04-14 00:00 |
16:15:33.08 |
+25:01:13.0 |
HIP 79639 |
30.18 |
| 2026-04-14 12:00 |
16:15:29.41 |
+25:01:48.7 |
HIP 79510 |
30.12 |
| 2026-04-15 00:00 |
16:15:25.71 |
+25:02:24.2 |
HIP 79510 |
29.11 |
| 2026-04-15 12:00 |
16:15:21.99 |
+25:02:59.4 |
HIP 79510 |
28.10 |
| 2026-04-16 00:00 |
16:15:18.23 |
+25:03:34.3 |
HIP 79510 |
27.09 |