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) |
| 2026-03-26 00:00 |
05:31:32.31 |
+31:43:02.9 |
HIP 25801 |
17.25 |
| 2026-03-26 12:00 |
05:31:33.03 |
+31:42:53.2 |
HIP 25801 |
17.24 |
| 2026-03-27 00:00 |
05:31:33.78 |
+31:42:43.5 |
HIP 25801 |
17.24 |
| 2026-03-27 12:00 |
05:31:34.58 |
+31:42:33.9 |
HIP 25801 |
17.25 |
| 2026-03-28 00:00 |
05:31:35.42 |
+31:42:24.3 |
HIP 25801 |
17.27 |
| 2026-03-28 12:00 |
05:31:36.29 |
+31:42:14.8 |
HIP 25801 |
17.30 |
| 2026-03-29 00:00 |
05:31:37.20 |
+31:42:05.3 |
HIP 25801 |
17.34 |
| 2026-03-29 12:00 |
05:31:38.15 |
+31:41:55.9 |
HIP 25801 |
17.39 |
| 2026-03-30 00:00 |
05:31:39.14 |
+31:41:46.5 |
HIP 25801 |
17.45 |
| 2026-03-30 12:00 |
05:31:40.17 |
+31:41:37.1 |
HIP 25801 |
17.53 |
| 2026-03-31 00:00 |
05:31:41.23 |
+31:41:27.8 |
HIP 25801 |
17.61 |
| 2026-03-31 12:00 |
05:31:42.33 |
+31:41:18.6 |
HIP 25801 |
17.70 |
| 2026-04-01 00:00 |
05:31:43.47 |
+31:41:09.4 |
HIP 25801 |
17.80 |
| 2026-04-01 12:00 |
05:31:44.64 |
+31:41:00.3 |
HIP 25801 |
17.92 |
| 2026-04-02 00:00 |
05:31:45.86 |
+31:40:51.2 |
HIP 25801 |
18.04 |
| 2026-04-02 12:00 |
05:31:47.10 |
+31:40:42.2 |
HIP 25801 |
18.18 |
| 2026-04-03 00:00 |
05:31:48.39 |
+31:40:33.2 |
HIP 25801 |
18.33 |
| 2026-04-03 12:00 |
05:31:49.71 |
+31:40:24.3 |
HIP 25801 |
18.49 |
| 2026-04-04 00:00 |
05:31:51.07 |
+31:40:15.4 |
HIP 25801 |
18.66 |
| 2026-04-04 12:00 |
05:31:52.47 |
+31:40:06.6 |
HIP 25801 |
18.84 |
| 2026-04-05 00:00 |
05:31:53.90 |
+31:39:57.8 |
HIP 25801 |
19.03 |
| 2026-04-05 12:00 |
05:31:55.37 |
+31:39:49.1 |
HIP 25801 |
19.24 |
| 2026-04-06 00:00 |
05:31:56.87 |
+31:39:40.4 |
HIP 25801 |
19.45 |
| 2026-04-06 12:00 |
05:31:58.41 |
+31:39:31.8 |
HIP 25801 |
19.68 |
| 2026-04-07 00:00 |
05:31:59.98 |
+31:39:23.3 |
HIP 25801 |
19.91 |
| 2026-04-07 12:00 |
05:32:01.59 |
+31:39:14.8 |
HIP 25801 |
20.16 |
| 2026-04-08 00:00 |
05:32:03.24 |
+31:39:06.4 |
HIP 25801 |
20.42 |
| 2026-04-08 12:00 |
05:32:04.92 |
+31:38:58.0 |
HIP 25801 |
20.69 |
| 2026-04-09 00:00 |
05:32:06.63 |
+31:38:49.7 |
HIP 25801 |
20.97 |
| 2026-04-09 12:00 |
05:32:08.38 |
+31:38:41.4 |
HIP 25801 |
21.27 |
| 2026-04-10 00:00 |
05:32:10.17 |
+31:38:33.2 |
HIP 25801 |
21.57 |
| 2026-04-10 12:00 |
05:32:11.98 |
+31:38:25.0 |
HIP 25801 |
21.88 |
| 2026-04-11 00:00 |
05:32:13.84 |
+31:38:16.9 |
HIP 25801 |
22.20 |
| 2026-04-11 12:00 |
05:32:15.72 |
+31:38:08.9 |
HIP 25801 |
22.54 |
| 2026-04-12 00:00 |
05:32:17.64 |
+31:38:00.9 |
HIP 25801 |
22.88 |
| 2026-04-12 12:00 |
05:32:19.60 |
+31:37:53.0 |
HIP 25801 |
23.23 |
| 2026-04-13 00:00 |
05:32:21.59 |
+31:37:45.2 |
HIP 25801 |
23.60 |
| 2026-04-13 12:00 |
05:32:23.61 |
+31:37:37.4 |
HIP 25801 |
23.97 |
| 2026-04-14 00:00 |
05:32:25.66 |
+31:37:29.6 |
HIP 25801 |
24.35 |
| 2026-04-14 12:00 |
05:32:27.75 |
+31:37:22.0 |
HIP 25801 |
24.75 |
| 2026-04-15 00:00 |
05:32:29.87 |
+31:37:14.3 |
HIP 25801 |
25.15 |
| 2026-04-15 12:00 |
05:32:32.02 |
+31:37:06.8 |
HIP 25801 |
25.56 |
| 2026-04-16 00:00 |
05:32:34.21 |
+31:36:59.3 |
HIP 25801 |
25.98 |