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) |
| 2026-03-26 00:00 |
06:43:43.22 |
+20:07:10.1 |
HIP 32302 |
15.21 |
| 2026-03-26 12:00 |
06:43:42.49 |
+20:07:13.5 |
HIP 32302 |
15.38 |
| 2026-03-27 00:00 |
06:43:41.82 |
+20:07:16.8 |
HIP 32302 |
15.55 |
| 2026-03-27 12:00 |
06:43:41.20 |
+20:07:20.0 |
HIP 32302 |
15.70 |
| 2026-03-28 00:00 |
06:43:40.62 |
+20:07:23.2 |
HIP 32302 |
15.84 |
| 2026-03-28 12:00 |
06:43:40.10 |
+20:07:26.4 |
HIP 32302 |
15.97 |
| 2026-03-29 00:00 |
06:43:39.63 |
+20:07:29.4 |
HIP 32302 |
16.10 |
| 2026-03-29 12:00 |
06:43:39.20 |
+20:07:32.5 |
HIP 32302 |
16.21 |
| 2026-03-30 00:00 |
06:43:38.82 |
+20:07:35.5 |
HIP 32302 |
16.31 |
| 2026-03-30 12:00 |
06:43:38.50 |
+20:07:38.4 |
HIP 32302 |
16.40 |
| 2026-03-31 00:00 |
06:43:38.22 |
+20:07:41.3 |
HIP 32302 |
16.48 |
| 2026-03-31 12:00 |
06:43:37.99 |
+20:07:44.1 |
HIP 32302 |
16.55 |
| 2026-04-01 00:00 |
06:43:37.81 |
+20:07:46.8 |
HIP 32302 |
16.61 |
| 2026-04-01 12:00 |
06:43:37.68 |
+20:07:49.5 |
HIP 32302 |
16.66 |
| 2026-04-02 00:00 |
06:43:37.60 |
+20:07:52.2 |
HIP 32302 |
16.70 |
| 2026-04-02 12:00 |
06:43:37.57 |
+20:07:54.8 |
HIP 32302 |
16.73 |
| 2026-04-03 00:00 |
06:43:37.59 |
+20:07:57.3 |
HIP 32302 |
16.75 |
| 2026-04-03 12:00 |
06:43:37.65 |
+20:07:59.8 |
HIP 32302 |
16.75 |
| 2026-04-04 00:00 |
06:43:37.77 |
+20:08:02.3 |
HIP 32302 |
16.75 |
| 2026-04-04 12:00 |
06:43:37.93 |
+20:08:04.6 |
HIP 32302 |
16.74 |
| 2026-04-05 00:00 |
06:43:38.14 |
+20:08:07.0 |
HIP 32302 |
16.72 |
| 2026-04-05 12:00 |
06:43:38.40 |
+20:08:09.2 |
HIP 32302 |
16.69 |
| 2026-04-06 00:00 |
06:43:38.70 |
+20:08:11.4 |
HIP 32302 |
16.65 |
| 2026-04-06 12:00 |
06:43:39.06 |
+20:08:13.6 |
HIP 32302 |
16.60 |
| 2026-04-07 00:00 |
06:43:39.46 |
+20:08:15.7 |
HIP 32302 |
16.54 |
| 2026-04-07 12:00 |
06:43:39.91 |
+20:08:17.7 |
HIP 32302 |
16.47 |
| 2026-04-08 00:00 |
06:43:40.41 |
+20:08:19.7 |
HIP 32302 |
16.39 |
| 2026-04-08 12:00 |
06:43:40.95 |
+20:08:21.6 |
HIP 32302 |
16.30 |
| 2026-04-09 00:00 |
06:43:41.55 |
+20:08:23.5 |
HIP 32302 |
16.20 |
| 2026-04-09 12:00 |
06:43:42.19 |
+20:08:25.3 |
HIP 32302 |
16.09 |
| 2026-04-10 00:00 |
06:43:42.88 |
+20:08:27.1 |
HIP 32302 |
15.98 |
| 2026-04-10 12:00 |
06:43:43.61 |
+20:08:28.8 |
HIP 32302 |
15.85 |
| 2026-04-11 00:00 |
06:43:44.39 |
+20:08:30.4 |
HIP 32302 |
15.72 |
| 2026-04-11 12:00 |
06:43:45.22 |
+20:08:32.0 |
HIP 32302 |
15.58 |
| 2026-04-12 00:00 |
06:43:46.10 |
+20:08:33.5 |
HIP 32302 |
15.43 |
| 2026-04-12 12:00 |
06:43:47.02 |
+20:08:34.9 |
HIP 32302 |
15.27 |
| 2026-04-13 00:00 |
06:43:47.99 |
+20:08:36.4 |
HIP 32302 |
15.11 |
| 2026-04-13 12:00 |
06:43:49.00 |
+20:08:37.7 |
HIP 32302 |
14.93 |
| 2026-04-14 00:00 |
06:43:50.06 |
+20:08:39.0 |
HIP 32302 |
14.75 |
| 2026-04-14 12:00 |
06:43:51.17 |
+20:08:40.2 |
HIP 32302 |
14.57 |
| 2026-04-15 00:00 |
06:43:52.33 |
+20:08:41.4 |
HIP 32302 |
14.38 |
| 2026-04-15 12:00 |
06:43:53.52 |
+20:08:42.5 |
HIP 32302 |
14.18 |
| 2026-04-16 00:00 |
06:43:54.77 |
+20:08:43.5 |
HIP 32302 |
13.97 |