メタデータ
| 項目 |
値 |
| Designation |
C/2008 E1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2008-08-11T20:28:01.989120Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:42:27Z |
| Obs used |
265 |
| NEO |
- |
| M1 |
6.300 |
| K1 |
12.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2008-11-20.0000000 |
| e |
0.54811137 |
| q (au) |
4.828912 |
| a (au) |
10.686066 |
| i (deg) |
35.037529 |
| Ω (om, deg) |
189.023580 |
| ω (w, deg) |
269.989090 |
| M (ma, deg) |
2.825635 |
等級
散乱 + 全体線形
$$
M_a = (8.357 + 5.831\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.357 |
| n |
5.831 |
| gf |
1.000 |
| gb |
-0.809 |
| k |
0.800 |
| δ90 |
9.961 |
| 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 |
| 2006-11-19 |
2008-04-04 |
+45.1347 |
-31.077 |
| 2008-09-24 |
2010-04-11 |
-0.2830 |
+0.015 |
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) |
| 2026-05-12 00:00 |
18:42:50.38 |
+13:12:22.8 |
HIP 91885 |
15.34 |
| 2026-05-12 12:00 |
18:42:46.79 |
+13:13:08.3 |
HIP 91885 |
16.26 |
| 2026-05-13 00:00 |
18:42:43.15 |
+13:13:53.4 |
HIP 91885 |
17.23 |
| 2026-05-13 12:00 |
18:42:39.45 |
+13:14:38.1 |
HIP 91885 |
18.22 |
| 2026-05-14 00:00 |
18:42:35.71 |
+13:15:22.5 |
HIP 91779 |
19.17 |
| 2026-05-14 12:00 |
18:42:31.92 |
+13:16:06.4 |
HIP 91779 |
18.70 |
| 2026-05-15 00:00 |
18:42:28.07 |
+13:16:50.0 |
HIP 91779 |
18.31 |
| 2026-05-15 12:00 |
18:42:24.18 |
+13:17:33.1 |
HIP 91779 |
18.00 |
| 2026-05-16 00:00 |
18:42:20.24 |
+13:18:15.9 |
HIP 91779 |
17.78 |
| 2026-05-16 12:00 |
18:42:16.26 |
+13:18:58.2 |
HIP 91779 |
17.64 |
| 2026-05-17 00:00 |
18:42:12.22 |
+13:19:40.2 |
HIP 91779 |
17.60 |
| 2026-05-17 12:00 |
18:42:08.14 |
+13:20:21.7 |
HIP 91779 |
17.65 |
| 2026-05-18 00:00 |
18:42:04.01 |
+13:21:02.8 |
HIP 91779 |
17.80 |
| 2026-05-18 12:00 |
18:41:59.84 |
+13:21:43.5 |
HIP 91779 |
18.04 |
| 2026-05-19 00:00 |
18:41:55.62 |
+13:22:23.8 |
HIP 91779 |
18.38 |
| 2026-05-19 12:00 |
18:41:51.36 |
+13:23:03.6 |
HIP 91779 |
18.80 |
| 2026-05-20 00:00 |
18:41:47.05 |
+13:23:43.0 |
HIP 91779 |
19.30 |
| 2026-05-20 12:00 |
18:41:42.69 |
+13:24:22.0 |
HIP 91569 |
19.76 |
| 2026-05-21 00:00 |
18:41:38.29 |
+13:25:00.5 |
HIP 91569 |
18.79 |
| 2026-05-21 12:00 |
18:41:33.85 |
+13:25:38.6 |
HIP 91569 |
17.83 |
| 2026-05-22 00:00 |
18:41:29.37 |
+13:26:16.2 |
HIP 91569 |
16.90 |
| 2026-05-22 12:00 |
18:41:24.84 |
+13:26:53.4 |
HIP 91569 |
16.00 |
| 2026-05-23 00:00 |
18:41:20.27 |
+13:27:30.2 |
HIP 91569 |
15.15 |
| 2026-05-23 12:00 |
18:41:15.66 |
+13:28:06.4 |
HIP 91569 |
14.34 |
| 2026-05-24 00:00 |
18:41:11.01 |
+13:28:42.3 |
HIP 91569 |
13.59 |
| 2026-05-24 12:00 |
18:41:06.32 |
+13:29:17.6 |
HIP 91569 |
12.92 |
| 2026-05-25 00:00 |
18:41:01.58 |
+13:29:52.5 |
HIP 91569 |
12.33 |
| 2026-05-25 12:00 |
18:40:56.81 |
+13:30:27.0 |
HIP 91569 |
11.83 |
| 2026-05-26 00:00 |
18:40:52.00 |
+13:31:01.0 |
HIP 91569 |
11.45 |
| 2026-05-26 12:00 |
18:40:47.15 |
+13:31:34.5 |
HIP 91569 |
11.20 |
| 2026-05-27 00:00 |
18:40:42.26 |
+13:32:07.5 |
HIP 91569 |
11.09 |
| 2026-05-27 12:00 |
18:40:37.33 |
+13:32:40.0 |
HIP 91569 |
11.12 |
| 2026-05-28 00:00 |
18:40:32.37 |
+13:33:12.1 |
HIP 91569 |
11.29 |
| 2026-05-28 12:00 |
18:40:27.36 |
+13:33:43.7 |
HIP 91569 |
11.60 |
| 2026-05-29 00:00 |
18:40:22.33 |
+13:34:14.8 |
HIP 91569 |
12.05 |
| 2026-05-29 12:00 |
18:40:17.25 |
+13:34:45.4 |
HIP 91569 |
12.61 |
| 2026-05-30 00:00 |
18:40:12.14 |
+13:35:15.6 |
HIP 91569 |
13.27 |
| 2026-05-30 12:00 |
18:40:07.00 |
+13:35:45.2 |
HIP 91569 |
14.03 |
| 2026-05-31 00:00 |
18:40:01.82 |
+13:36:14.4 |
HIP 91569 |
14.86 |
| 2026-05-31 12:00 |
18:39:56.60 |
+13:36:43.0 |
HIP 91569 |
15.77 |
| 2026-06-01 00:00 |
18:39:51.35 |
+13:37:11.2 |
HIP 91569 |
16.73 |
| 2026-06-01 12:00 |
18:39:46.07 |
+13:37:38.8 |
HIP 91569 |
17.73 |
| 2026-06-02 00:00 |
18:39:40.76 |
+13:38:06.0 |
HIP 91569 |
18.78 |