メタデータ
| 項目 |
値 |
| Designation |
C/2015 F3 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-03-09T08:31:54.042240Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:09Z |
| Obs used |
316 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
8.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-04-16.0000000 |
| e |
0.99638676 |
| q (au) |
0.834438 |
| a (au) |
230.939218 |
| i (deg) |
73.386412 |
| Ω (om, deg) |
31.639644 |
| ω (w, deg) |
57.566073 |
| M (ma, deg) |
0.010572 |
等級
散乱 + 全体線形
$$
M_a = (14.649 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.649 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.999 |
| k |
1.000 |
| 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 |
| 2015-03-24 |
2015-05-30 |
+6.9369 |
-1.877 |
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 |
13:48:44.15 |
-51:14:57.7 |
HIP 67234 |
22.38 |
| 2026-03-26 12:00 |
13:48:37.92 |
-51:15:02.3 |
HIP 67234 |
21.50 |
| 2026-03-27 00:00 |
13:48:31.67 |
-51:15:06.4 |
HIP 67234 |
20.63 |
| 2026-03-27 12:00 |
13:48:25.39 |
-51:15:10.0 |
HIP 67234 |
19.76 |
| 2026-03-28 00:00 |
13:48:19.08 |
-51:15:13.3 |
HIP 67234 |
18.92 |
| 2026-03-28 12:00 |
13:48:12.76 |
-51:15:16.1 |
HIP 67234 |
18.08 |
| 2026-03-29 00:00 |
13:48:06.41 |
-51:15:18.5 |
HIP 67234 |
17.27 |
| 2026-03-29 12:00 |
13:48:00.04 |
-51:15:20.4 |
HIP 67234 |
16.48 |
| 2026-03-30 00:00 |
13:47:53.65 |
-51:15:21.9 |
HIP 67234 |
15.71 |
| 2026-03-30 12:00 |
13:47:47.24 |
-51:15:23.0 |
HIP 67234 |
14.97 |
| 2026-03-31 00:00 |
13:47:40.81 |
-51:15:23.7 |
HIP 67234 |
14.27 |
| 2026-03-31 12:00 |
13:47:34.36 |
-51:15:23.9 |
HIP 67234 |
13.61 |
| 2026-04-01 00:00 |
13:47:27.88 |
-51:15:23.7 |
HIP 67234 |
13.00 |
| 2026-04-01 12:00 |
13:47:21.39 |
-51:15:23.1 |
HIP 67234 |
12.45 |
| 2026-04-02 00:00 |
13:47:14.89 |
-51:15:22.0 |
HIP 67234 |
11.96 |
| 2026-04-02 12:00 |
13:47:08.36 |
-51:15:20.5 |
HIP 67234 |
11.54 |
| 2026-04-03 00:00 |
13:47:01.82 |
-51:15:18.6 |
HIP 67234 |
11.21 |
| 2026-04-03 12:00 |
13:46:55.26 |
-51:15:16.3 |
HIP 67234 |
10.97 |
| 2026-04-04 00:00 |
13:46:48.68 |
-51:15:13.5 |
HIP 67234 |
10.84 |
| 2026-04-04 12:00 |
13:46:42.09 |
-51:15:10.3 |
HIP 67234 |
10.80 |
| 2026-04-05 00:00 |
13:46:35.48 |
-51:15:06.6 |
HIP 67234 |
10.87 |
| 2026-04-05 12:00 |
13:46:28.86 |
-51:15:02.6 |
HIP 67234 |
11.04 |
| 2026-04-06 00:00 |
13:46:22.23 |
-51:14:58.1 |
HIP 67234 |
11.32 |
| 2026-04-06 12:00 |
13:46:15.58 |
-51:14:53.2 |
HIP 67234 |
11.68 |
| 2026-04-07 00:00 |
13:46:08.92 |
-51:14:47.8 |
HIP 67234 |
12.14 |
| 2026-04-07 12:00 |
13:46:02.25 |
-51:14:42.0 |
HIP 67234 |
12.67 |
| 2026-04-08 00:00 |
13:45:55.56 |
-51:14:35.8 |
HIP 67234 |
13.27 |
| 2026-04-08 12:00 |
13:45:48.87 |
-51:14:29.2 |
HIP 67234 |
13.92 |
| 2026-04-09 00:00 |
13:45:42.16 |
-51:14:22.2 |
HIP 67234 |
14.64 |
| 2026-04-09 12:00 |
13:45:35.44 |
-51:14:14.7 |
HIP 67234 |
15.39 |
| 2026-04-10 00:00 |
13:45:28.72 |
-51:14:06.8 |
HIP 67234 |
16.19 |
| 2026-04-10 12:00 |
13:45:21.98 |
-51:13:58.4 |
HIP 67036 |
16.80 |
| 2026-04-11 00:00 |
13:45:15.24 |
-51:13:49.7 |
HIP 67036 |
16.05 |
| 2026-04-11 12:00 |
13:45:08.49 |
-51:13:40.5 |
HIP 67036 |
15.33 |
| 2026-04-12 00:00 |
13:45:01.74 |
-51:13:30.9 |
HIP 67036 |
14.65 |
| 2026-04-12 12:00 |
13:44:54.97 |
-51:13:20.9 |
HIP 67036 |
14.01 |
| 2026-04-13 00:00 |
13:44:48.20 |
-51:13:10.5 |
HIP 67036 |
13.42 |
| 2026-04-13 12:00 |
13:44:41.43 |
-51:12:59.6 |
HIP 67036 |
12.88 |
| 2026-04-14 00:00 |
13:44:34.65 |
-51:12:48.4 |
HIP 67036 |
12.41 |
| 2026-04-14 12:00 |
13:44:27.87 |
-51:12:36.7 |
HIP 67036 |
12.01 |
| 2026-04-15 00:00 |
13:44:21.08 |
-51:12:24.6 |
HIP 67036 |
11.69 |
| 2026-04-15 12:00 |
13:44:14.29 |
-51:12:12.1 |
HIP 67036 |
11.46 |
| 2026-04-16 00:00 |
13:44:07.50 |
-51:11:59.1 |
HIP 67036 |
11.32 |