C/2007 K3 (Siding Spring)
メタデータ
| 項目 |
値 |
| Designation |
C/2007 K3 (Siding Spring) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-04-21T17:04:30.377280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:08Z |
| Obs used |
94 |
| NEO |
- |
| M1 |
13.300 |
| K1 |
13.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-02-09.0000000 |
| e |
1.00124061 |
| q (au) |
2.050740 |
| a (au) |
-1653.004343 |
| i (deg) |
16.300560 |
| Ω (om, deg) |
263.252666 |
| ω (w, deg) |
23.593153 |
| M (ma, deg) |
-0.001066 |
等級
散乱 + 全体線形
$$
M_a = (15.558 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.558 |
| n |
2.000 |
| gf |
0.992 |
| gb |
-0.528 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2007-04-18 |
2007-07-18 |
-5.6572 |
+2.028 |
| 2008-06-09 |
2008-09-30 |
+25.5806 |
-9.587 |
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) |
| 2026-02-03 00:00 |
05:08:17.55 |
+24:01:31.5 |
HIP 23900 |
14.60 |
| 2026-02-03 12:00 |
05:08:15.69 |
+24:01:27.7 |
HIP 23900 |
14.60 |
| 2026-02-04 00:00 |
05:08:13.87 |
+24:01:23.8 |
HIP 23900 |
14.61 |
| 2026-02-04 12:00 |
05:08:12.06 |
+24:01:20.0 |
HIP 23900 |
14.63 |
| 2026-02-05 00:00 |
05:08:10.29 |
+24:01:16.2 |
HIP 23900 |
14.66 |
| 2026-02-05 12:00 |
05:08:08.54 |
+24:01:12.5 |
HIP 23900 |
14.71 |
| 2026-02-06 00:00 |
05:08:06.82 |
+24:01:08.8 |
HIP 23900 |
14.77 |
| 2026-02-06 12:00 |
05:08:05.13 |
+24:01:05.1 |
HIP 23900 |
14.83 |
| 2026-02-07 00:00 |
05:08:03.47 |
+24:01:01.4 |
HIP 23900 |
14.91 |
| 2026-02-07 12:00 |
05:08:01.83 |
+24:00:57.8 |
HIP 23900 |
14.99 |
| 2026-02-08 00:00 |
05:08:00.23 |
+24:00:54.2 |
HIP 23900 |
15.08 |
| 2026-02-08 12:00 |
05:07:58.65 |
+24:00:50.6 |
HIP 23900 |
15.18 |
| 2026-02-09 00:00 |
05:07:57.10 |
+24:00:47.1 |
HIP 23900 |
15.28 |
| 2026-02-09 12:00 |
05:07:55.58 |
+24:00:43.5 |
HIP 23900 |
15.39 |
| 2026-02-10 00:00 |
05:07:54.09 |
+24:00:40.1 |
HIP 23900 |
15.51 |
| 2026-02-10 12:00 |
05:07:52.63 |
+24:00:36.6 |
HIP 23900 |
15.63 |
| 2026-02-11 00:00 |
05:07:51.19 |
+24:00:33.2 |
HIP 23900 |
15.76 |
| 2026-02-11 12:00 |
05:07:49.79 |
+24:00:29.8 |
HIP 23900 |
15.89 |
| 2026-02-12 00:00 |
05:07:48.42 |
+24:00:26.5 |
HIP 23900 |
16.02 |
| 2026-02-12 12:00 |
05:07:47.07 |
+24:00:23.2 |
HIP 23900 |
16.15 |
| 2026-02-13 00:00 |
05:07:45.76 |
+24:00:19.9 |
HIP 23900 |
16.29 |
| 2026-02-13 12:00 |
05:07:44.47 |
+24:00:16.6 |
HIP 23900 |
16.43 |
| 2026-02-14 00:00 |
05:07:43.21 |
+24:00:13.4 |
HIP 23900 |
16.57 |
| 2026-02-14 12:00 |
05:07:41.99 |
+24:00:10.3 |
HIP 23900 |
16.71 |
| 2026-02-15 00:00 |
05:07:40.79 |
+24:00:07.1 |
HIP 23900 |
16.86 |
| 2026-02-15 12:00 |
05:07:39.62 |
+24:00:04.0 |
HIP 23900 |
17.00 |
| 2026-02-16 00:00 |
05:07:38.49 |
+24:00:00.9 |
HIP 23900 |
17.14 |
| 2026-02-16 12:00 |
05:07:37.38 |
+23:59:57.9 |
HIP 23900 |
17.29 |
| 2026-02-17 00:00 |
05:07:36.31 |
+23:59:54.9 |
HIP 23900 |
17.43 |
| 2026-02-17 12:00 |
05:07:35.26 |
+23:59:51.9 |
HIP 23900 |
17.57 |
| 2026-02-18 00:00 |
05:07:34.25 |
+23:59:49.0 |
HIP 23900 |
17.71 |
| 2026-02-18 12:00 |
05:07:33.26 |
+23:59:46.1 |
HIP 23900 |
17.85 |
| 2026-02-19 00:00 |
05:07:32.31 |
+23:59:43.2 |
HIP 23900 |
17.98 |
| 2026-02-19 12:00 |
05:07:31.39 |
+23:59:40.4 |
HIP 23900 |
18.12 |
| 2026-02-20 00:00 |
05:07:30.50 |
+23:59:37.6 |
HIP 23900 |
18.25 |
| 2026-02-20 12:00 |
05:07:29.63 |
+23:59:34.8 |
HIP 23900 |
18.38 |
| 2026-02-21 00:00 |
05:07:28.80 |
+23:59:32.1 |
HIP 23900 |
18.51 |
| 2026-02-21 12:00 |
05:07:28.00 |
+23:59:29.4 |
HIP 23900 |
18.64 |
| 2026-02-22 00:00 |
05:07:27.24 |
+23:59:26.8 |
HIP 23900 |
18.76 |
| 2026-02-22 12:00 |
05:07:26.50 |
+23:59:24.2 |
HIP 23900 |
18.88 |
| 2026-02-23 00:00 |
05:07:25.79 |
+23:59:21.6 |
HIP 23900 |
18.99 |
| 2026-02-23 12:00 |
05:07:25.11 |
+23:59:19.1 |
HIP 23900 |
19.11 |
| 2026-02-24 00:00 |
05:07:24.47 |
+23:59:16.6 |
HIP 23900 |
19.21 |