C/2011 Q4 (SWAN)
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) |
| 2026-02-03 00:00 |
05:33:52.57 |
+32:01:41.7 |
HIP 26034 |
17.52 |
| 2026-02-03 12:00 |
05:33:49.21 |
+32:01:30.9 |
HIP 25984 |
17.11 |
| 2026-02-04 00:00 |
05:33:45.88 |
+32:01:20.0 |
HIP 25984 |
16.65 |
| 2026-02-04 12:00 |
05:33:42.58 |
+32:01:09.1 |
HIP 25984 |
16.22 |
| 2026-02-05 00:00 |
05:33:39.33 |
+32:00:58.2 |
HIP 25984 |
15.82 |
| 2026-02-05 12:00 |
05:33:36.10 |
+32:00:47.3 |
HIP 25984 |
15.44 |
| 2026-02-06 00:00 |
05:33:32.92 |
+32:00:36.3 |
HIP 25984 |
15.10 |
| 2026-02-06 12:00 |
05:33:29.76 |
+32:00:25.3 |
HIP 25984 |
14.78 |
| 2026-02-07 00:00 |
05:33:26.65 |
+32:00:14.3 |
HIP 25984 |
14.50 |
| 2026-02-07 12:00 |
05:33:23.57 |
+32:00:03.3 |
HIP 25984 |
14.24 |
| 2026-02-08 00:00 |
05:33:20.53 |
+31:59:52.2 |
HIP 25984 |
14.03 |
| 2026-02-08 12:00 |
05:33:17.52 |
+31:59:41.1 |
HIP 25984 |
13.84 |
| 2026-02-09 00:00 |
05:33:14.56 |
+31:59:29.9 |
HIP 25984 |
13.69 |
| 2026-02-09 12:00 |
05:33:11.62 |
+31:59:18.8 |
HIP 25984 |
13.57 |
| 2026-02-10 00:00 |
05:33:08.73 |
+31:59:07.6 |
HIP 25984 |
13.48 |
| 2026-02-10 12:00 |
05:33:05.88 |
+31:58:56.4 |
HIP 25984 |
13.43 |
| 2026-02-11 00:00 |
05:33:03.06 |
+31:58:45.2 |
HIP 25984 |
13.41 |
| 2026-02-11 12:00 |
05:33:00.28 |
+31:58:34.0 |
HIP 25984 |
13.42 |
| 2026-02-12 00:00 |
05:32:57.54 |
+31:58:22.7 |
HIP 25984 |
13.47 |
| 2026-02-12 12:00 |
05:32:54.83 |
+31:58:11.5 |
HIP 25984 |
13.54 |
| 2026-02-13 00:00 |
05:32:52.17 |
+31:58:00.2 |
HIP 25984 |
13.64 |
| 2026-02-13 12:00 |
05:32:49.54 |
+31:57:48.9 |
HIP 25984 |
13.76 |
| 2026-02-14 00:00 |
05:32:46.96 |
+31:57:37.6 |
HIP 25984 |
13.91 |
| 2026-02-14 12:00 |
05:32:44.41 |
+31:57:26.3 |
HIP 25984 |
14.09 |
| 2026-02-15 00:00 |
05:32:41.90 |
+31:57:14.9 |
HIP 25984 |
14.28 |
| 2026-02-15 12:00 |
05:32:39.43 |
+31:57:03.6 |
HIP 25984 |
14.49 |
| 2026-02-16 00:00 |
05:32:37.00 |
+31:56:52.2 |
HIP 25984 |
14.72 |
| 2026-02-16 12:00 |
05:32:34.61 |
+31:56:40.8 |
HIP 25984 |
14.96 |
| 2026-02-17 00:00 |
05:32:32.26 |
+31:56:29.5 |
HIP 25984 |
15.22 |
| 2026-02-17 12:00 |
05:32:29.95 |
+31:56:18.1 |
HIP 25984 |
15.50 |
| 2026-02-18 00:00 |
05:32:27.68 |
+31:56:06.7 |
HIP 25984 |
15.78 |
| 2026-02-18 12:00 |
05:32:25.45 |
+31:55:55.3 |
HIP 25984 |
16.07 |
| 2026-02-19 00:00 |
05:32:23.26 |
+31:55:43.9 |
HIP 25984 |
16.37 |
| 2026-02-19 12:00 |
05:32:21.11 |
+31:55:32.5 |
HIP 25984 |
16.68 |
| 2026-02-20 00:00 |
05:32:19.00 |
+31:55:21.1 |
HIP 25984 |
16.99 |
| 2026-02-20 12:00 |
05:32:16.93 |
+31:55:09.7 |
HIP 25984 |
17.31 |
| 2026-02-21 00:00 |
05:32:14.90 |
+31:54:58.2 |
HIP 25984 |
17.64 |
| 2026-02-21 12:00 |
05:32:12.92 |
+31:54:46.8 |
HIP 25984 |
17.97 |
| 2026-02-22 00:00 |
05:32:10.97 |
+31:54:35.4 |
HIP 25984 |
18.29 |
| 2026-02-22 12:00 |
05:32:09.07 |
+31:54:24.0 |
HIP 25876 |
18.40 |
| 2026-02-23 00:00 |
05:32:07.20 |
+31:54:12.6 |
HIP 25876 |
18.37 |
| 2026-02-23 12:00 |
05:32:05.38 |
+31:54:01.2 |
HIP 25876 |
18.37 |
| 2026-02-24 00:00 |
05:32:03.60 |
+31:53:49.8 |
HIP 25876 |
18.37 |