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 |
-0.998 |
| 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) |
| 2026-09-20 00:00 |
13:37:25.76 |
-48:37:50.5 |
HIP 66330 |
19.22 |
| 2026-09-20 12:00 |
13:37:30.96 |
-48:37:50.9 |
HIP 66603 |
19.34 |
| 2026-09-21 00:00 |
13:37:36.19 |
-48:37:51.6 |
HIP 66603 |
18.61 |
| 2026-09-21 12:00 |
13:37:41.45 |
-48:37:52.7 |
HIP 66603 |
17.88 |
| 2026-09-22 00:00 |
13:37:46.72 |
-48:37:54.2 |
HIP 66603 |
17.16 |
| 2026-09-22 12:00 |
13:37:52.01 |
-48:37:56.0 |
HIP 66603 |
16.45 |
| 2026-09-23 00:00 |
13:37:57.33 |
-48:37:58.2 |
HIP 66603 |
15.75 |
| 2026-09-23 12:00 |
13:38:02.66 |
-48:38:00.7 |
HIP 66603 |
15.06 |
| 2026-09-24 00:00 |
13:38:08.02 |
-48:38:03.5 |
HIP 66603 |
14.39 |
| 2026-09-24 12:00 |
13:38:13.39 |
-48:38:06.8 |
HIP 66603 |
13.73 |
| 2026-09-25 00:00 |
13:38:18.78 |
-48:38:10.3 |
HIP 66603 |
13.09 |
| 2026-09-25 12:00 |
13:38:24.20 |
-48:38:14.2 |
HIP 66603 |
12.48 |
| 2026-09-26 00:00 |
13:38:29.63 |
-48:38:18.5 |
HIP 66603 |
11.90 |
| 2026-09-26 12:00 |
13:38:35.08 |
-48:38:23.1 |
HIP 66603 |
11.35 |
| 2026-09-27 00:00 |
13:38:40.54 |
-48:38:28.1 |
HIP 66603 |
10.85 |
| 2026-09-27 12:00 |
13:38:46.03 |
-48:38:33.4 |
HIP 66603 |
10.39 |
| 2026-09-28 00:00 |
13:38:51.53 |
-48:38:39.0 |
HIP 66603 |
9.99 |
| 2026-09-28 12:00 |
13:38:57.05 |
-48:38:45.0 |
HIP 66603 |
9.65 |
| 2026-09-29 00:00 |
13:39:02.58 |
-48:38:51.4 |
HIP 66603 |
9.38 |
| 2026-09-29 12:00 |
13:39:08.13 |
-48:38:58.1 |
HIP 66603 |
9.19 |
| 2026-09-30 00:00 |
13:39:13.70 |
-48:39:05.1 |
HIP 66603 |
9.08 |
| 2026-09-30 12:00 |
13:39:19.28 |
-48:39:12.5 |
HIP 66603 |
9.07 |
| 2026-10-01 00:00 |
13:39:24.88 |
-48:39:20.2 |
HIP 66603 |
9.14 |
| 2026-10-01 12:00 |
13:39:30.50 |
-48:39:28.3 |
HIP 66603 |
9.30 |
| 2026-10-02 00:00 |
13:39:36.13 |
-48:39:36.7 |
HIP 66603 |
9.55 |
| 2026-10-02 12:00 |
13:39:41.77 |
-48:39:45.5 |
HIP 66603 |
9.88 |
| 2026-10-03 00:00 |
13:39:47.43 |
-48:39:54.6 |
HIP 66603 |
10.28 |
| 2026-10-03 12:00 |
13:39:53.10 |
-48:40:04.1 |
HIP 66603 |
10.74 |
| 2026-10-04 00:00 |
13:39:58.78 |
-48:40:13.9 |
HIP 66603 |
11.27 |
| 2026-10-04 12:00 |
13:40:04.48 |
-48:40:24.0 |
HIP 66603 |
11.84 |
| 2026-10-05 00:00 |
13:40:10.19 |
-48:40:34.5 |
HIP 66603 |
12.46 |
| 2026-10-05 12:00 |
13:40:15.91 |
-48:40:45.4 |
HIP 66603 |
13.12 |
| 2026-10-06 00:00 |
13:40:21.64 |
-48:40:56.5 |
HIP 66603 |
13.81 |
| 2026-10-06 12:00 |
13:40:27.39 |
-48:41:08.1 |
HIP 66603 |
14.53 |
| 2026-10-07 00:00 |
13:40:33.14 |
-48:41:19.9 |
HIP 66603 |
15.28 |
| 2026-10-07 12:00 |
13:40:38.91 |
-48:41:32.1 |
HIP 66603 |
16.05 |
| 2026-10-08 00:00 |
13:40:44.69 |
-48:41:44.7 |
HIP 66603 |
16.84 |
| 2026-10-08 12:00 |
13:40:50.48 |
-48:41:57.6 |
HIP 66603 |
17.65 |
| 2026-10-09 00:00 |
13:40:56.28 |
-48:42:10.8 |
HIP 66854 |
18.09 |
| 2026-10-09 12:00 |
13:41:02.08 |
-48:42:24.3 |
HIP 66854 |
17.70 |
| 2026-10-10 00:00 |
13:41:07.90 |
-48:42:38.2 |
HIP 66854 |
17.36 |
| 2026-10-10 12:00 |
13:41:13.72 |
-48:42:52.5 |
HIP 66854 |
17.08 |
| 2026-10-11 00:00 |
13:41:19.56 |
-48:43:07.0 |
HIP 66854 |
16.85 |