メタデータ
| 項目 |
値 |
| Designation |
C/2005 S4 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-07-18T15:31:21.316800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:53Z |
| Obs used |
580 |
| NEO |
- |
| M1 |
9.900 |
| K1 |
5.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2007-06-06.0000000 |
| e |
0.99897119 |
| q (au) |
5.850108 |
| a (au) |
5686.269098 |
| i (deg) |
107.958958 |
| Ω (om, deg) |
318.290291 |
| ω (w, deg) |
31.453945 |
| M (ma, deg) |
359.999902 |
等級
散乱 + 全体線形
$$
M_a = (6.966 + 3.745\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.966 |
| n |
3.745 |
| gf |
0.995 |
| gb |
-0.897 |
| k |
0.999 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2005-07-27 |
2007-07-16 |
-1.0253 |
+0.679 |
| 2007-07-19 |
2008-10-06 |
+18.7523 |
-14.647 |
| 2008-10-06 |
2009-07-23 |
+4.6293 |
-3.301 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
10:00:22.70 |
+28:59:31.2 |
HIP 49103 |
17.42 |
| 2026-06-01 12:00 |
10:00:23.22 |
+28:59:09.8 |
HIP 49103 |
17.09 |
| 2026-06-02 00:00 |
10:00:23.77 |
+28:58:48.4 |
HIP 49103 |
16.75 |
| 2026-06-02 12:00 |
10:00:24.35 |
+28:58:26.8 |
HIP 49103 |
16.41 |
| 2026-06-03 00:00 |
10:00:24.96 |
+28:58:05.2 |
HIP 49103 |
16.06 |
| 2026-06-03 12:00 |
10:00:25.60 |
+28:57:43.4 |
HIP 49103 |
15.71 |
| 2026-06-04 00:00 |
10:00:26.27 |
+28:57:21.6 |
HIP 49103 |
15.36 |
| 2026-06-04 12:00 |
10:00:26.96 |
+28:56:59.6 |
HIP 49103 |
15.00 |
| 2026-06-05 00:00 |
10:00:27.69 |
+28:56:37.6 |
HIP 49103 |
14.64 |
| 2026-06-05 12:00 |
10:00:28.44 |
+28:56:15.5 |
HIP 49103 |
14.28 |
| 2026-06-06 00:00 |
10:00:29.22 |
+28:55:53.3 |
HIP 49103 |
13.91 |
| 2026-06-06 12:00 |
10:00:30.03 |
+28:55:31.0 |
HIP 49103 |
13.54 |
| 2026-06-07 00:00 |
10:00:30.86 |
+28:55:08.7 |
HIP 49103 |
13.17 |
| 2026-06-07 12:00 |
10:00:31.73 |
+28:54:46.2 |
HIP 49103 |
12.79 |
| 2026-06-08 00:00 |
10:00:32.62 |
+28:54:23.7 |
HIP 49103 |
12.41 |
| 2026-06-08 12:00 |
10:00:33.54 |
+28:54:01.1 |
HIP 49103 |
12.02 |
| 2026-06-09 00:00 |
10:00:34.49 |
+28:53:38.4 |
HIP 49103 |
11.64 |
| 2026-06-09 12:00 |
10:00:35.46 |
+28:53:15.6 |
HIP 49103 |
11.25 |
| 2026-06-10 00:00 |
10:00:36.47 |
+28:52:52.8 |
HIP 49103 |
10.86 |
| 2026-06-10 12:00 |
10:00:37.50 |
+28:52:29.8 |
HIP 49103 |
10.46 |
| 2026-06-11 00:00 |
10:00:38.55 |
+28:52:06.8 |
HIP 49103 |
10.07 |
| 2026-06-11 12:00 |
10:00:39.64 |
+28:51:43.8 |
HIP 49103 |
9.67 |
| 2026-06-12 00:00 |
10:00:40.75 |
+28:51:20.6 |
HIP 49103 |
9.28 |
| 2026-06-12 12:00 |
10:00:41.89 |
+28:50:57.4 |
HIP 49103 |
8.88 |
| 2026-06-13 00:00 |
10:00:43.06 |
+28:50:34.1 |
HIP 49103 |
8.48 |
| 2026-06-13 12:00 |
10:00:44.25 |
+28:50:10.7 |
HIP 49103 |
8.09 |
| 2026-06-14 00:00 |
10:00:45.47 |
+28:49:47.3 |
HIP 49103 |
7.70 |
| 2026-06-14 12:00 |
10:00:46.71 |
+28:49:23.8 |
HIP 49103 |
7.31 |
| 2026-06-15 00:00 |
10:00:47.99 |
+28:49:00.3 |
HIP 49103 |
6.92 |
| 2026-06-15 12:00 |
10:00:49.29 |
+28:48:36.6 |
HIP 49103 |
6.55 |
| 2026-06-16 00:00 |
10:00:50.61 |
+28:48:13.0 |
HIP 49103 |
6.18 |
| 2026-06-16 12:00 |
10:00:51.96 |
+28:47:49.2 |
HIP 49103 |
5.83 |
| 2026-06-17 00:00 |
10:00:53.34 |
+28:47:25.4 |
HIP 49103 |
5.49 |
| 2026-06-17 12:00 |
10:00:54.74 |
+28:47:01.6 |
HIP 49103 |
5.17 |
| 2026-06-18 00:00 |
10:00:56.17 |
+28:46:37.7 |
HIP 49103 |
4.88 |
| 2026-06-18 12:00 |
10:00:57.62 |
+28:46:13.7 |
HIP 49103 |
4.61 |
| 2026-06-19 00:00 |
10:00:59.10 |
+28:45:49.7 |
HIP 49103 |
4.39 |
| 2026-06-19 12:00 |
10:01:00.60 |
+28:45:25.6 |
HIP 49103 |
4.21 |
| 2026-06-20 00:00 |
10:01:02.13 |
+28:45:01.5 |
HIP 49103 |
4.09 |
| 2026-06-20 12:00 |
10:01:03.68 |
+28:44:37.4 |
HIP 49103 |
4.03 |
| 2026-06-21 00:00 |
10:01:05.26 |
+28:44:13.2 |
HIP 49103 |
4.04 |
| 2026-06-21 12:00 |
10:01:06.86 |
+28:43:48.9 |
HIP 49103 |
4.11 |
| 2026-06-22 00:00 |
10:01:08.49 |
+28:43:24.6 |
HIP 49103 |
4.24 |