メタデータ
| 項目 |
値 |
| Designation |
C/2006 M4 (SWAN) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-09-28T17:29:02.883840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
1265 |
| NEO |
- |
| M1 |
11.000 |
| K1 |
7.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-11-10.0000000 |
| e |
1.00018505 |
| q (au) |
0.783008 |
| a (au) |
-4231.355299 |
| i (deg) |
111.823262 |
| Ω (om, deg) |
148.726842 |
| ω (w, deg) |
62.594371 |
| M (ma, deg) |
0.000151 |
等級
散乱 + 全体線形
$$
M_a = (6.701 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.701 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
22:05:11.43 |
-57:59:38.5 |
HIP 108968 |
11.73 |
| 2026-05-12 12:00 |
22:05:12.19 |
-58:00:09.8 |
HIP 108968 |
11.31 |
| 2026-05-13 00:00 |
22:05:12.91 |
-58:00:41.3 |
HIP 108968 |
10.89 |
| 2026-05-13 12:00 |
22:05:13.58 |
-58:01:12.9 |
HIP 108968 |
10.47 |
| 2026-05-14 00:00 |
22:05:14.21 |
-58:01:44.6 |
HIP 108968 |
10.07 |
| 2026-05-14 12:00 |
22:05:14.80 |
-58:02:16.5 |
HIP 108968 |
9.67 |
| 2026-05-15 00:00 |
22:05:15.34 |
-58:02:48.5 |
HIP 108968 |
9.28 |
| 2026-05-15 12:00 |
22:05:15.84 |
-58:03:20.6 |
HIP 108968 |
8.89 |
| 2026-05-16 00:00 |
22:05:16.29 |
-58:03:52.8 |
HIP 108968 |
8.52 |
| 2026-05-16 12:00 |
22:05:16.70 |
-58:04:25.2 |
HIP 108968 |
8.17 |
| 2026-05-17 00:00 |
22:05:17.07 |
-58:04:57.6 |
HIP 108968 |
7.83 |
| 2026-05-17 12:00 |
22:05:17.39 |
-58:05:30.2 |
HIP 108968 |
7.51 |
| 2026-05-18 00:00 |
22:05:17.66 |
-58:06:02.9 |
HIP 108968 |
7.20 |
| 2026-05-18 12:00 |
22:05:17.90 |
-58:06:35.7 |
HIP 108968 |
6.93 |
| 2026-05-19 00:00 |
22:05:18.09 |
-58:07:08.6 |
HIP 108968 |
6.68 |
| 2026-05-19 12:00 |
22:05:18.23 |
-58:07:41.6 |
HIP 108968 |
6.46 |
| 2026-05-20 00:00 |
22:05:18.33 |
-58:08:14.7 |
HIP 108968 |
6.27 |
| 2026-05-20 12:00 |
22:05:18.38 |
-58:08:47.9 |
HIP 108968 |
6.13 |
| 2026-05-21 00:00 |
22:05:18.39 |
-58:09:21.2 |
HIP 108968 |
6.02 |
| 2026-05-21 12:00 |
22:05:18.36 |
-58:09:54.6 |
HIP 108968 |
5.96 |
| 2026-05-22 00:00 |
22:05:18.28 |
-58:10:28.1 |
HIP 108968 |
5.94 |
| 2026-05-22 12:00 |
22:05:18.16 |
-58:11:01.7 |
HIP 108968 |
5.98 |
| 2026-05-23 00:00 |
22:05:17.99 |
-58:11:35.3 |
HIP 108968 |
6.05 |
| 2026-05-23 12:00 |
22:05:17.78 |
-58:12:09.1 |
HIP 108968 |
6.18 |
| 2026-05-24 00:00 |
22:05:17.52 |
-58:12:42.9 |
HIP 108968 |
6.34 |
| 2026-05-24 12:00 |
22:05:17.22 |
-58:13:16.8 |
HIP 108968 |
6.55 |
| 2026-05-25 00:00 |
22:05:16.87 |
-58:13:50.8 |
HIP 108968 |
6.79 |
| 2026-05-25 12:00 |
22:05:16.48 |
-58:14:24.9 |
HIP 108968 |
7.07 |
| 2026-05-26 00:00 |
22:05:16.05 |
-58:14:59.0 |
HIP 108968 |
7.38 |
| 2026-05-26 12:00 |
22:05:15.57 |
-58:15:33.2 |
HIP 108968 |
7.71 |
| 2026-05-27 00:00 |
22:05:15.05 |
-58:16:07.5 |
HIP 108968 |
8.07 |
| 2026-05-27 12:00 |
22:05:14.48 |
-58:16:41.8 |
HIP 108968 |
8.44 |
| 2026-05-28 00:00 |
22:05:13.87 |
-58:17:16.2 |
HIP 108968 |
8.84 |
| 2026-05-28 12:00 |
22:05:13.21 |
-58:17:50.7 |
HIP 108968 |
9.26 |
| 2026-05-29 00:00 |
22:05:12.51 |
-58:18:25.2 |
HIP 108968 |
9.68 |
| 2026-05-29 12:00 |
22:05:11.76 |
-58:18:59.8 |
HIP 108968 |
10.13 |
| 2026-05-30 00:00 |
22:05:10.97 |
-58:19:34.4 |
HIP 108968 |
10.58 |
| 2026-05-30 12:00 |
22:05:10.14 |
-58:20:09.1 |
HIP 108968 |
11.04 |
| 2026-05-31 00:00 |
22:05:09.26 |
-58:20:43.8 |
HIP 108968 |
11.52 |
| 2026-05-31 12:00 |
22:05:08.34 |
-58:21:18.6 |
HIP 108968 |
12.00 |
| 2026-06-01 00:00 |
22:05:07.37 |
-58:21:53.4 |
HIP 108968 |
12.49 |
| 2026-06-01 12:00 |
22:05:06.36 |
-58:22:28.2 |
HIP 108968 |
12.99 |
| 2026-06-02 00:00 |
22:05:05.30 |
-58:23:03.1 |
HIP 108968 |
13.50 |