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) |
| 2026-05-12 00:00 |
05:35:06.52 |
+31:31:56.7 |
HIP 26374 |
27.02 |
| 2026-05-12 12:00 |
05:35:10.08 |
+31:31:52.6 |
HIP 26374 |
26.32 |
| 2026-05-13 00:00 |
05:35:13.66 |
+31:31:48.5 |
HIP 26374 |
25.63 |
| 2026-05-13 12:00 |
05:35:17.25 |
+31:31:44.6 |
HIP 26374 |
24.93 |
| 2026-05-14 00:00 |
05:35:20.87 |
+31:31:40.7 |
HIP 26374 |
24.24 |
| 2026-05-14 12:00 |
05:35:24.50 |
+31:31:36.8 |
HIP 26374 |
23.55 |
| 2026-05-15 00:00 |
05:35:28.16 |
+31:31:33.0 |
HIP 26374 |
22.86 |
| 2026-05-15 12:00 |
05:35:31.83 |
+31:31:29.3 |
HIP 26374 |
22.17 |
| 2026-05-16 00:00 |
05:35:35.51 |
+31:31:25.7 |
HIP 26374 |
21.49 |
| 2026-05-16 12:00 |
05:35:39.22 |
+31:31:22.1 |
HIP 26374 |
20.82 |
| 2026-05-17 00:00 |
05:35:42.94 |
+31:31:18.6 |
HIP 26374 |
20.15 |
| 2026-05-17 12:00 |
05:35:46.68 |
+31:31:15.2 |
HIP 26374 |
19.48 |
| 2026-05-18 00:00 |
05:35:50.44 |
+31:31:11.8 |
HIP 26374 |
18.83 |
| 2026-05-18 12:00 |
05:35:54.21 |
+31:31:08.5 |
HIP 26374 |
18.19 |
| 2026-05-19 00:00 |
05:35:58.00 |
+31:31:05.2 |
HIP 26374 |
17.56 |
| 2026-05-19 12:00 |
05:36:01.80 |
+31:31:02.0 |
HIP 26374 |
16.94 |
| 2026-05-20 00:00 |
05:36:05.62 |
+31:30:58.9 |
HIP 26374 |
16.34 |
| 2026-05-20 12:00 |
05:36:09.46 |
+31:30:55.9 |
HIP 26374 |
15.75 |
| 2026-05-21 00:00 |
05:36:13.31 |
+31:30:52.9 |
HIP 26374 |
15.19 |
| 2026-05-21 12:00 |
05:36:17.17 |
+31:30:50.0 |
HIP 26374 |
14.65 |
| 2026-05-22 00:00 |
05:36:21.05 |
+31:30:47.1 |
HIP 26374 |
14.14 |
| 2026-05-22 12:00 |
05:36:24.94 |
+31:30:44.3 |
HIP 26374 |
13.66 |
| 2026-05-23 00:00 |
05:36:28.85 |
+31:30:41.6 |
HIP 26374 |
13.21 |
| 2026-05-23 12:00 |
05:36:32.77 |
+31:30:38.9 |
HIP 26374 |
12.80 |
| 2026-05-24 00:00 |
05:36:36.70 |
+31:30:36.3 |
HIP 26374 |
12.43 |
| 2026-05-24 12:00 |
05:36:40.64 |
+31:30:33.8 |
HIP 26374 |
12.11 |
| 2026-05-25 00:00 |
05:36:44.60 |
+31:30:31.3 |
HIP 26374 |
11.85 |
| 2026-05-25 12:00 |
05:36:48.57 |
+31:30:28.9 |
HIP 26374 |
11.64 |
| 2026-05-26 00:00 |
05:36:52.55 |
+31:30:26.6 |
HIP 26374 |
11.49 |
| 2026-05-26 12:00 |
05:36:56.54 |
+31:30:24.3 |
HIP 26374 |
11.40 |
| 2026-05-27 00:00 |
05:37:00.54 |
+31:30:22.1 |
HIP 26374 |
11.37 |
| 2026-05-27 12:00 |
05:37:04.56 |
+31:30:19.9 |
HIP 26419 |
11.07 |
| 2026-05-28 00:00 |
05:37:08.58 |
+31:30:17.8 |
HIP 26419 |
10.79 |
| 2026-05-28 12:00 |
05:37:12.62 |
+31:30:15.8 |
HIP 26419 |
10.56 |
| 2026-05-29 00:00 |
05:37:16.67 |
+31:30:13.9 |
HIP 26419 |
10.40 |
| 2026-05-29 12:00 |
05:37:20.72 |
+31:30:12.0 |
HIP 26419 |
10.32 |
| 2026-05-30 00:00 |
05:37:24.79 |
+31:30:10.1 |
HIP 26419 |
10.31 |
| 2026-05-30 12:00 |
05:37:28.87 |
+31:30:08.4 |
HIP 26419 |
10.37 |
| 2026-05-31 00:00 |
05:37:32.95 |
+31:30:06.7 |
HIP 26419 |
10.50 |
| 2026-05-31 12:00 |
05:37:37.04 |
+31:30:05.0 |
HIP 26419 |
10.71 |
| 2026-06-01 00:00 |
05:37:41.15 |
+31:30:03.5 |
HIP 26419 |
10.99 |
| 2026-06-01 12:00 |
05:37:45.26 |
+31:30:01.9 |
HIP 26419 |
11.32 |
| 2026-06-02 00:00 |
05:37:49.38 |
+31:30:00.5 |
HIP 26419 |
11.72 |