メタデータ
| 項目 |
値 |
| Designation |
C/2015 F5 (SWAN-Xingming) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-28T02:23:27.029760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:09Z |
| Obs used |
209 |
| NEO |
Yes |
| M1 |
14.100 |
| K1 |
4.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-04-22.0000000 |
| e |
0.97774875 |
| q (au) |
0.346004 |
| a (au) |
15.549862 |
| i (deg) |
149.256648 |
| Ω (om, deg) |
287.739679 |
| ω (w, deg) |
13.393236 |
| M (ma, deg) |
0.400240 |
等級
散乱 + 全体線形
$$
M_a = (17.117 + 4.165\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.117 |
| n |
4.165 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2015-04-04 |
2015-06-07 |
-4.5612 |
-1.918 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
06:45:56.88 |
+20:08:12.4 |
HIP 32302 |
20.46 |
| 2026-05-12 12:00 |
06:46:00.22 |
+20:08:10.2 |
HIP 32302 |
21.15 |
| 2026-05-13 00:00 |
06:46:03.59 |
+20:08:07.8 |
HIP 32302 |
21.86 |
| 2026-05-13 12:00 |
06:46:07.00 |
+20:08:05.4 |
HIP 32302 |
22.58 |
| 2026-05-14 00:00 |
06:46:10.43 |
+20:08:03.0 |
HIP 32302 |
23.31 |
| 2026-05-14 12:00 |
06:46:13.90 |
+20:08:00.5 |
HIP 32302 |
24.05 |
| 2026-05-15 00:00 |
06:46:17.40 |
+20:07:57.9 |
HIP 32302 |
24.80 |
| 2026-05-15 12:00 |
06:46:20.94 |
+20:07:55.3 |
HIP 32302 |
25.56 |
| 2026-05-16 00:00 |
06:46:24.50 |
+20:07:52.6 |
HIP 32302 |
26.34 |
| 2026-05-16 12:00 |
06:46:28.10 |
+20:07:49.8 |
HIP 32302 |
27.12 |
| 2026-05-17 00:00 |
06:46:31.72 |
+20:07:47.0 |
HIP 32302 |
27.92 |
| 2026-05-17 12:00 |
06:46:35.38 |
+20:07:44.1 |
HIP 32302 |
28.72 |
| 2026-05-18 00:00 |
06:46:39.06 |
+20:07:41.1 |
HIP 32302 |
29.54 |
| 2026-05-18 12:00 |
06:46:42.78 |
+20:07:38.1 |
HIP 32302 |
30.36 |
| 2026-05-19 00:00 |
06:46:46.53 |
+20:07:35.0 |
HIP 32302 |
31.19 |
| 2026-05-19 12:00 |
06:46:50.30 |
+20:07:31.9 |
HIP 32302 |
32.03 |
| 2026-05-20 00:00 |
06:46:54.10 |
+20:07:28.7 |
HIP 32302 |
32.88 |
| 2026-05-20 12:00 |
06:46:57.94 |
+20:07:25.4 |
HIP 32302 |
33.74 |
| 2026-05-21 00:00 |
06:47:01.80 |
+20:07:22.1 |
HIP 32302 |
34.61 |
| 2026-05-21 12:00 |
06:47:05.68 |
+20:07:18.7 |
HIP 32302 |
35.48 |
| 2026-05-22 00:00 |
06:47:09.60 |
+20:07:15.2 |
HIP 32302 |
36.37 |
| 2026-05-22 12:00 |
06:47:13.54 |
+20:07:11.7 |
HIP 32676 |
36.06 |
| 2026-05-23 00:00 |
06:47:17.51 |
+20:07:08.1 |
HIP 32676 |
35.48 |
| 2026-05-23 12:00 |
06:47:21.50 |
+20:07:04.4 |
HIP 32676 |
34.92 |
| 2026-05-24 00:00 |
06:47:25.53 |
+20:07:00.7 |
HIP 32676 |
34.37 |
| 2026-05-24 12:00 |
06:47:29.57 |
+20:06:57.0 |
HIP 32676 |
33.83 |
| 2026-05-25 00:00 |
06:47:33.65 |
+20:06:53.1 |
HIP 32676 |
33.31 |
| 2026-05-25 12:00 |
06:47:37.74 |
+20:06:49.2 |
HIP 32676 |
32.81 |
| 2026-05-26 00:00 |
06:47:41.87 |
+20:06:45.3 |
HIP 32676 |
32.33 |
| 2026-05-26 12:00 |
06:47:46.01 |
+20:06:41.3 |
HIP 32676 |
31.86 |
| 2026-05-27 00:00 |
06:47:50.19 |
+20:06:37.2 |
HIP 32676 |
31.42 |
| 2026-05-27 12:00 |
06:47:54.38 |
+20:06:33.0 |
HIP 32676 |
31.00 |
| 2026-05-28 00:00 |
06:47:58.60 |
+20:06:28.8 |
HIP 32676 |
30.61 |
| 2026-05-28 12:00 |
06:48:02.84 |
+20:06:24.6 |
HIP 32676 |
30.24 |
| 2026-05-29 00:00 |
06:48:07.11 |
+20:06:20.3 |
HIP 32676 |
29.90 |
| 2026-05-29 12:00 |
06:48:11.40 |
+20:06:15.9 |
HIP 32676 |
29.59 |
| 2026-05-30 00:00 |
06:48:15.71 |
+20:06:11.5 |
HIP 32676 |
29.30 |
| 2026-05-30 12:00 |
06:48:20.04 |
+20:06:07.0 |
HIP 32676 |
29.05 |
| 2026-05-31 00:00 |
06:48:24.40 |
+20:06:02.4 |
HIP 32676 |
28.84 |
| 2026-05-31 12:00 |
06:48:28.77 |
+20:05:57.8 |
HIP 32676 |
28.66 |
| 2026-06-01 00:00 |
06:48:33.17 |
+20:05:53.1 |
HIP 32676 |
28.51 |
| 2026-06-01 12:00 |
06:48:37.59 |
+20:05:48.4 |
HIP 32676 |
28.40 |
| 2026-06-02 00:00 |
06:48:42.03 |
+20:05:43.6 |
HIP 32676 |
28.33 |