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 |
9.976 |
| 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) |
| 2026-09-20 00:00 |
18:23:27.10 |
+11:58:22.1 |
HIP 90078 |
9.83 |
| 2026-09-20 12:00 |
18:23:27.34 |
+11:57:21.7 |
HIP 90078 |
10.62 |
| 2026-09-21 00:00 |
18:23:27.64 |
+11:56:21.2 |
HIP 90078 |
11.45 |
| 2026-09-21 12:00 |
18:23:28.01 |
+11:55:20.8 |
HIP 90078 |
12.31 |
| 2026-09-22 00:00 |
18:23:28.43 |
+11:54:20.4 |
HIP 90078 |
13.21 |
| 2026-09-22 12:00 |
18:23:28.91 |
+11:53:20.0 |
HIP 90078 |
14.12 |
| 2026-09-23 00:00 |
18:23:29.46 |
+11:52:19.6 |
HIP 90078 |
15.06 |
| 2026-09-23 12:00 |
18:23:30.07 |
+11:51:19.3 |
HIP 90078 |
16.01 |
| 2026-09-24 00:00 |
18:23:30.73 |
+11:50:19.0 |
HIP 90078 |
16.98 |
| 2026-09-24 12:00 |
18:23:31.46 |
+11:49:18.7 |
HIP 90078 |
17.96 |
| 2026-09-25 00:00 |
18:23:32.25 |
+11:48:18.5 |
HIP 90078 |
18.95 |
| 2026-09-25 12:00 |
18:23:33.10 |
+11:47:18.3 |
HIP 90078 |
19.94 |
| 2026-09-26 00:00 |
18:23:34.02 |
+11:46:18.2 |
HIP 90247 |
20.04 |
| 2026-09-26 12:00 |
18:23:34.99 |
+11:45:18.1 |
HIP 90247 |
20.15 |
| 2026-09-27 00:00 |
18:23:36.02 |
+11:44:18.1 |
HIP 90247 |
20.29 |
| 2026-09-27 12:00 |
18:23:37.12 |
+11:43:18.2 |
HIP 90247 |
20.48 |
| 2026-09-28 00:00 |
18:23:38.27 |
+11:42:18.3 |
HIP 90247 |
20.70 |
| 2026-09-28 12:00 |
18:23:39.49 |
+11:41:18.5 |
HIP 90247 |
20.95 |
| 2026-09-29 00:00 |
18:23:40.76 |
+11:40:18.7 |
HIP 90247 |
21.25 |
| 2026-09-29 12:00 |
18:23:42.10 |
+11:39:19.1 |
HIP 90247 |
21.57 |
| 2026-09-30 00:00 |
18:23:43.50 |
+11:38:19.5 |
HIP 90247 |
21.93 |
| 2026-09-30 12:00 |
18:23:44.95 |
+11:37:20.0 |
HIP 90247 |
22.32 |
| 2026-10-01 00:00 |
18:23:46.47 |
+11:36:20.6 |
HIP 90247 |
22.74 |
| 2026-10-01 12:00 |
18:23:48.05 |
+11:35:21.3 |
HIP 90247 |
23.19 |
| 2026-10-02 00:00 |
18:23:49.69 |
+11:34:22.1 |
HIP 90247 |
23.67 |
| 2026-10-02 12:00 |
18:23:51.39 |
+11:33:23.0 |
HIP 90247 |
24.17 |
| 2026-10-03 00:00 |
18:23:53.15 |
+11:32:24.0 |
HIP 90247 |
24.71 |
| 2026-10-03 12:00 |
18:23:54.97 |
+11:31:25.1 |
HIP 90033 |
25.25 |
| 2026-10-04 00:00 |
18:23:56.84 |
+11:30:26.3 |
HIP 90033 |
25.52 |
| 2026-10-04 12:00 |
18:23:58.78 |
+11:29:27.6 |
HIP 90033 |
25.84 |
| 2026-10-05 00:00 |
18:24:00.78 |
+11:28:29.1 |
HIP 90033 |
26.21 |
| 2026-10-05 12:00 |
18:24:02.84 |
+11:27:30.7 |
HIP 90033 |
26.64 |
| 2026-10-06 00:00 |
18:24:04.96 |
+11:26:32.4 |
HIP 90033 |
27.13 |
| 2026-10-06 12:00 |
18:24:07.14 |
+11:25:34.3 |
HIP 90285 |
26.34 |
| 2026-10-07 00:00 |
18:24:09.38 |
+11:24:36.3 |
HIP 90285 |
25.26 |
| 2026-10-07 12:00 |
18:24:11.67 |
+11:23:38.5 |
HIP 90285 |
24.17 |
| 2026-10-08 00:00 |
18:24:14.03 |
+11:22:40.8 |
HIP 90285 |
23.07 |
| 2026-10-08 12:00 |
18:24:16.45 |
+11:21:43.3 |
HIP 90285 |
21.97 |
| 2026-10-09 00:00 |
18:24:18.92 |
+11:20:45.9 |
HIP 90285 |
20.86 |
| 2026-10-09 12:00 |
18:24:21.45 |
+11:19:48.7 |
HIP 90285 |
19.74 |
| 2026-10-10 00:00 |
18:24:24.05 |
+11:18:51.6 |
HIP 90285 |
18.62 |
| 2026-10-10 12:00 |
18:24:26.70 |
+11:17:54.8 |
HIP 90285 |
17.50 |
| 2026-10-11 00:00 |
18:24:29.41 |
+11:16:58.1 |
HIP 90285 |
16.37 |