メタデータ
| 項目 |
値 |
| Designation |
C/2011 Q4 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-09-21T02:00:10.520640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:56Z |
| Obs used |
168 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
9.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-11-05.0000000 |
| e |
0.97415823 |
| q (au) |
1.112227 |
| a (au) |
43.039904 |
| i (deg) |
147.843070 |
| Ω (om, deg) |
252.085709 |
| ω (w, deg) |
1.880850 |
| M (ma, deg) |
0.156785 |
等級
散乱 + 全体線形
$$
M_a = (13.419 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.419 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.663 |
| 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) |
| 2026-09-20 00:00 |
05:48:16.21 |
+31:44:33.3 |
HIP 27538 |
21.27 |
| 2026-09-20 12:00 |
05:48:15.95 |
+31:44:40.2 |
HIP 27538 |
21.31 |
| 2026-09-21 00:00 |
05:48:15.64 |
+31:44:47.1 |
HIP 27538 |
21.36 |
| 2026-09-21 12:00 |
05:48:15.29 |
+31:44:54.0 |
HIP 27538 |
21.42 |
| 2026-09-22 00:00 |
05:48:14.91 |
+31:45:00.9 |
HIP 27538 |
21.49 |
| 2026-09-22 12:00 |
05:48:14.49 |
+31:45:07.8 |
HIP 27538 |
21.57 |
| 2026-09-23 00:00 |
05:48:14.02 |
+31:45:14.7 |
HIP 27538 |
21.66 |
| 2026-09-23 12:00 |
05:48:13.52 |
+31:45:21.6 |
HIP 27538 |
21.76 |
| 2026-09-24 00:00 |
05:48:12.98 |
+31:45:28.5 |
HIP 27538 |
21.86 |
| 2026-09-24 12:00 |
05:48:12.39 |
+31:45:35.3 |
HIP 27538 |
21.98 |
| 2026-09-25 00:00 |
05:48:11.77 |
+31:45:42.2 |
HIP 27538 |
22.10 |
| 2026-09-25 12:00 |
05:48:11.11 |
+31:45:49.0 |
HIP 27538 |
22.23 |
| 2026-09-26 00:00 |
05:48:10.41 |
+31:45:55.8 |
HIP 27538 |
22.37 |
| 2026-09-26 12:00 |
05:48:09.67 |
+31:46:02.6 |
HIP 27538 |
22.53 |
| 2026-09-27 00:00 |
05:48:08.89 |
+31:46:09.4 |
HIP 27538 |
22.69 |
| 2026-09-27 12:00 |
05:48:08.07 |
+31:46:16.2 |
HIP 27538 |
22.85 |
| 2026-09-28 00:00 |
05:48:07.21 |
+31:46:22.9 |
HIP 27538 |
23.03 |
| 2026-09-28 12:00 |
05:48:06.32 |
+31:46:29.7 |
HIP 27538 |
23.22 |
| 2026-09-29 00:00 |
05:48:05.38 |
+31:46:36.4 |
HIP 27538 |
23.42 |
| 2026-09-29 12:00 |
05:48:04.40 |
+31:46:43.1 |
HIP 27538 |
23.62 |
| 2026-09-30 00:00 |
05:48:03.39 |
+31:46:49.8 |
HIP 27538 |
23.83 |
| 2026-09-30 12:00 |
05:48:02.33 |
+31:46:56.5 |
HIP 27538 |
24.06 |
| 2026-10-01 00:00 |
05:48:01.23 |
+31:47:03.1 |
HIP 27538 |
24.29 |
| 2026-10-01 12:00 |
05:48:00.10 |
+31:47:09.7 |
HIP 27538 |
24.53 |
| 2026-10-02 00:00 |
05:47:58.92 |
+31:47:16.3 |
HIP 27538 |
24.78 |
| 2026-10-02 12:00 |
05:47:57.71 |
+31:47:22.9 |
HIP 27538 |
25.04 |
| 2026-10-03 00:00 |
05:47:56.46 |
+31:47:29.5 |
HIP 27538 |
25.31 |
| 2026-10-03 12:00 |
05:47:55.16 |
+31:47:36.0 |
HIP 27538 |
25.58 |
| 2026-10-04 00:00 |
05:47:53.83 |
+31:47:42.5 |
HIP 27538 |
25.87 |
| 2026-10-04 12:00 |
05:47:52.46 |
+31:47:49.0 |
HIP 27538 |
26.16 |
| 2026-10-05 00:00 |
05:47:51.05 |
+31:47:55.5 |
HIP 27538 |
26.46 |
| 2026-10-05 12:00 |
05:47:49.60 |
+31:48:01.9 |
HIP 27538 |
26.77 |
| 2026-10-06 00:00 |
05:47:48.10 |
+31:48:08.3 |
HIP 27538 |
27.09 |
| 2026-10-06 12:00 |
05:47:46.57 |
+31:48:14.7 |
HIP 27538 |
27.42 |
| 2026-10-07 00:00 |
05:47:45.00 |
+31:48:21.0 |
HIP 27538 |
27.76 |
| 2026-10-07 12:00 |
05:47:43.40 |
+31:48:27.4 |
HIP 27538 |
28.11 |
| 2026-10-08 00:00 |
05:47:41.75 |
+31:48:33.7 |
HIP 27538 |
28.46 |
| 2026-10-08 12:00 |
05:47:40.06 |
+31:48:39.9 |
HIP 27538 |
28.82 |
| 2026-10-09 00:00 |
05:47:38.33 |
+31:48:46.1 |
HIP 27538 |
29.20 |
| 2026-10-09 12:00 |
05:47:36.57 |
+31:48:52.3 |
HIP 27538 |
29.58 |
| 2026-10-10 00:00 |
05:47:34.76 |
+31:48:58.5 |
HIP 27538 |
29.97 |
| 2026-10-10 12:00 |
05:47:32.92 |
+31:49:04.6 |
HIP 27538 |
30.36 |
| 2026-10-11 00:00 |
05:47:31.04 |
+31:49:10.7 |
HIP 27538 |
30.77 |