メタデータ
| 項目 |
値 |
| Designation |
C/2007 Q3 (Siding Spring) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-10-07T06:29:51.262080Z |
| Orbit solution date (soln_date, UTC) |
2025-07-07T14:12:19Z |
| Obs used |
1341 |
| NEO |
- |
| M1 |
8.800 |
| 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) |
2009-08-20.0000000 |
| e |
1.00023766 |
| q (au) |
2.251688 |
| a (au) |
-9474.438449 |
| i (deg) |
65.650492 |
| Ω (om, deg) |
149.412684 |
| ω (w, deg) |
2.092860 |
| M (ma, deg) |
-0.000052 |
等級
散乱 + 全体線形
$$
M_a = (7.715 + 2.602\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.715 |
| n |
2.602 |
| gf |
1.000 |
| gb |
-0.644 |
| k |
0.990 |
| 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 |
| 2007-08-25 |
2009-03-15 |
+1.0261 |
-1.390 |
| 2009-03-15 |
2009-05-10 |
+22.4756 |
-12.601 |
| 2009-05-10 |
2009-10-03 |
-25.2024 |
+8.557 |
| 2009-10-10 |
2010-02-28 |
+8.7989 |
-3.980 |
| 2010-02-28 |
2010-06-04 |
+2.9606 |
-2.284 |
| 2010-06-04 |
2010-10-30 |
+3.8990 |
-2.293 |
| 2010-10-30 |
2011-09-25 |
+6.2804 |
-3.627 |
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) |
| 2026-03-26 00:00 |
20:54:11.53 |
+08:05:22.7 |
HIP 103185 |
6.15 |
| 2026-03-26 12:00 |
20:54:13.64 |
+08:05:45.6 |
HIP 103185 |
5.62 |
| 2026-03-27 00:00 |
20:54:15.72 |
+08:06:08.5 |
HIP 103185 |
5.12 |
| 2026-03-27 12:00 |
20:54:17.78 |
+08:06:31.5 |
HIP 103185 |
4.65 |
| 2026-03-28 00:00 |
20:54:19.82 |
+08:06:54.5 |
HIP 103185 |
4.23 |
| 2026-03-28 12:00 |
20:54:21.83 |
+08:07:17.5 |
HIP 103185 |
3.87 |
| 2026-03-29 00:00 |
20:54:23.82 |
+08:07:40.5 |
HIP 103185 |
3.57 |
| 2026-03-29 12:00 |
20:54:25.79 |
+08:08:03.5 |
HIP 103185 |
3.37 |
| 2026-03-30 00:00 |
20:54:27.73 |
+08:08:26.5 |
HIP 103185 |
3.27 |
| 2026-03-30 12:00 |
20:54:29.65 |
+08:08:49.6 |
HIP 103185 |
3.28 |
| 2026-03-31 00:00 |
20:54:31.55 |
+08:09:12.6 |
HIP 103185 |
3.40 |
| 2026-03-31 12:00 |
20:54:33.43 |
+08:09:35.7 |
HIP 103185 |
3.61 |
| 2026-04-01 00:00 |
20:54:35.27 |
+08:09:58.8 |
HIP 103185 |
3.89 |
| 2026-04-01 12:00 |
20:54:37.10 |
+08:10:21.9 |
HIP 103185 |
4.24 |
| 2026-04-02 00:00 |
20:54:38.90 |
+08:10:45.0 |
HIP 103185 |
4.63 |
| 2026-04-02 12:00 |
20:54:40.68 |
+08:11:08.0 |
HIP 103185 |
5.05 |
| 2026-04-03 00:00 |
20:54:42.43 |
+08:11:31.1 |
HIP 103185 |
5.50 |
| 2026-04-03 12:00 |
20:54:44.16 |
+08:11:54.2 |
HIP 103185 |
5.96 |
| 2026-04-04 00:00 |
20:54:45.86 |
+08:12:17.3 |
HIP 103185 |
6.44 |
| 2026-04-04 12:00 |
20:54:47.54 |
+08:12:40.4 |
HIP 103185 |
6.92 |
| 2026-04-05 00:00 |
20:54:49.20 |
+08:13:03.5 |
HIP 103185 |
7.41 |
| 2026-04-05 12:00 |
20:54:50.83 |
+08:13:26.6 |
HIP 103185 |
7.91 |
| 2026-04-06 00:00 |
20:54:52.43 |
+08:13:49.6 |
HIP 103185 |
8.40 |
| 2026-04-06 12:00 |
20:54:54.01 |
+08:14:12.7 |
HIP 103185 |
8.90 |
| 2026-04-07 00:00 |
20:54:55.57 |
+08:14:35.8 |
HIP 103185 |
9.40 |
| 2026-04-07 12:00 |
20:54:57.10 |
+08:14:58.8 |
HIP 103185 |
9.89 |
| 2026-04-08 00:00 |
20:54:58.60 |
+08:15:21.8 |
HIP 103185 |
10.39 |
| 2026-04-08 12:00 |
20:55:00.08 |
+08:15:44.8 |
HIP 103185 |
10.88 |
| 2026-04-09 00:00 |
20:55:01.54 |
+08:16:07.8 |
HIP 103185 |
11.37 |
| 2026-04-09 12:00 |
20:55:02.96 |
+08:16:30.7 |
HIP 103185 |
11.85 |
| 2026-04-10 00:00 |
20:55:04.37 |
+08:16:53.7 |
HIP 103185 |
12.34 |
| 2026-04-10 12:00 |
20:55:05.74 |
+08:17:16.6 |
HIP 103185 |
12.82 |
| 2026-04-11 00:00 |
20:55:07.09 |
+08:17:39.5 |
HIP 103185 |
13.30 |
| 2026-04-11 12:00 |
20:55:08.42 |
+08:18:02.4 |
HIP 103185 |
13.77 |
| 2026-04-12 00:00 |
20:55:09.71 |
+08:18:25.2 |
HIP 103185 |
14.24 |
| 2026-04-12 12:00 |
20:55:10.98 |
+08:18:48.0 |
HIP 103185 |
14.70 |
| 2026-04-13 00:00 |
20:55:12.23 |
+08:19:10.8 |
HIP 103185 |
15.17 |
| 2026-04-13 12:00 |
20:55:13.45 |
+08:19:33.5 |
HIP 103185 |
15.62 |
| 2026-04-14 00:00 |
20:55:14.64 |
+08:19:56.2 |
HIP 103185 |
16.08 |
| 2026-04-14 12:00 |
20:55:15.81 |
+08:20:18.8 |
HIP 103185 |
16.52 |
| 2026-04-15 00:00 |
20:55:16.94 |
+08:20:41.4 |
HIP 103185 |
16.97 |
| 2026-04-15 12:00 |
20:55:18.06 |
+08:21:04.0 |
HIP 103185 |
17.41 |
| 2026-04-16 00:00 |
20:55:19.14 |
+08:21:26.6 |
HIP 103185 |
17.84 |