メタデータ
| 項目 |
値 |
| Designation |
C/2009 O2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-03-24T09:57:09.682560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:31Z |
| Obs used |
281 |
| NEO |
- |
| M1 |
12.900 |
| K1 |
7.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-10-31.0000000 |
| e |
0.99749905 |
| q (au) |
0.695547 |
| a (au) |
278.112822 |
| i (deg) |
107.960453 |
| Ω (om, deg) |
310.232085 |
| ω (w, deg) |
133.397136 |
| M (ma, deg) |
359.969311 |
等級
散乱 + 全体線形
$$
M_a = (14.631 + 3.055\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.631 |
| n |
3.055 |
| gf |
0.800 |
| gb |
-0.619 |
| k |
0.800 |
| δ90 |
9.999 |
| 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 |
| 2009-03-10 |
2009-07-30 |
-77.4381 |
+43.845 |
| 2009-07-30 |
2009-12-03 |
+12.4136 |
-6.726 |
| 2009-12-03 |
2010-03-24 |
-7.2272 |
-1.412 |
| 2010-03-26 |
2010-04-16 |
-88.5728 |
-12.010 |
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 |
01:18:05.95 |
-58:47:55.8 |
HIP 6223 |
32.93 |
| 2026-09-20 12:00 |
01:18:00.14 |
-58:48:20.6 |
HIP 6223 |
33.61 |
| 2026-09-21 00:00 |
01:17:54.30 |
-58:48:45.0 |
HIP 6223 |
34.30 |
| 2026-09-21 12:00 |
01:17:48.44 |
-58:49:09.1 |
HIP 6223 |
34.99 |
| 2026-09-22 00:00 |
01:17:42.56 |
-58:49:32.8 |
HIP 6223 |
35.68 |
| 2026-09-22 12:00 |
01:17:36.66 |
-58:49:56.1 |
HIP 6223 |
36.37 |
| 2026-09-23 00:00 |
01:17:30.74 |
-58:50:19.1 |
HIP 6223 |
37.07 |
| 2026-09-23 12:00 |
01:17:24.80 |
-58:50:41.7 |
HIP 6223 |
37.77 |
| 2026-09-24 00:00 |
01:17:18.84 |
-58:51:03.9 |
HIP 6223 |
38.48 |
| 2026-09-24 12:00 |
01:17:12.86 |
-58:51:25.7 |
HIP 6223 |
39.18 |
| 2026-09-25 00:00 |
01:17:06.86 |
-58:51:47.2 |
HIP 6223 |
39.89 |
| 2026-09-25 12:00 |
01:17:00.85 |
-58:52:08.3 |
HIP 6223 |
40.60 |
| 2026-09-26 00:00 |
01:16:54.82 |
-58:52:29.0 |
HIP 6223 |
41.31 |
| 2026-09-26 12:00 |
01:16:48.77 |
-58:52:49.3 |
HIP 6223 |
42.02 |
| 2026-09-27 00:00 |
01:16:42.70 |
-58:53:09.3 |
HIP 6223 |
42.73 |
| 2026-09-27 12:00 |
01:16:36.62 |
-58:53:28.8 |
HIP 6223 |
43.45 |
| 2026-09-28 00:00 |
01:16:30.52 |
-58:53:48.0 |
HIP 5561 |
44.03 |
| 2026-09-28 12:00 |
01:16:24.41 |
-58:54:06.8 |
HIP 5561 |
43.18 |
| 2026-09-29 00:00 |
01:16:18.29 |
-58:54:25.2 |
HIP 5561 |
42.34 |
| 2026-09-29 12:00 |
01:16:12.15 |
-58:54:43.2 |
HIP 5561 |
41.49 |
| 2026-09-30 00:00 |
01:16:05.99 |
-58:55:00.8 |
HIP 5561 |
40.65 |
| 2026-09-30 12:00 |
01:15:59.82 |
-58:55:18.0 |
HIP 5561 |
39.80 |
| 2026-10-01 00:00 |
01:15:53.64 |
-58:55:34.8 |
HIP 5561 |
38.96 |
| 2026-10-01 12:00 |
01:15:47.45 |
-58:55:51.2 |
HIP 5561 |
38.12 |
| 2026-10-02 00:00 |
01:15:41.25 |
-58:56:07.2 |
HIP 5561 |
37.29 |
| 2026-10-02 12:00 |
01:15:35.03 |
-58:56:22.9 |
HIP 5561 |
36.45 |
| 2026-10-03 00:00 |
01:15:28.81 |
-58:56:38.1 |
HIP 5561 |
35.62 |
| 2026-10-03 12:00 |
01:15:22.57 |
-58:56:52.9 |
HIP 5561 |
34.79 |
| 2026-10-04 00:00 |
01:15:16.32 |
-58:57:07.3 |
HIP 5561 |
33.96 |
| 2026-10-04 12:00 |
01:15:10.07 |
-58:57:21.3 |
HIP 5561 |
33.13 |
| 2026-10-05 00:00 |
01:15:03.80 |
-58:57:34.9 |
HIP 5561 |
32.31 |
| 2026-10-05 12:00 |
01:14:57.53 |
-58:57:48.0 |
HIP 5561 |
31.49 |
| 2026-10-06 00:00 |
01:14:51.25 |
-58:58:00.8 |
HIP 5561 |
30.67 |
| 2026-10-06 12:00 |
01:14:44.97 |
-58:58:13.2 |
HIP 5561 |
29.86 |
| 2026-10-07 00:00 |
01:14:38.67 |
-58:58:25.1 |
HIP 5561 |
29.05 |
| 2026-10-07 12:00 |
01:14:32.37 |
-58:58:36.6 |
HIP 5561 |
28.25 |
| 2026-10-08 00:00 |
01:14:26.07 |
-58:58:47.7 |
HIP 5561 |
27.45 |
| 2026-10-08 12:00 |
01:14:19.76 |
-58:58:58.4 |
HIP 5561 |
26.65 |
| 2026-10-09 00:00 |
01:14:13.44 |
-58:59:08.7 |
HIP 5561 |
25.86 |
| 2026-10-09 12:00 |
01:14:07.12 |
-58:59:18.5 |
HIP 5561 |
25.08 |
| 2026-10-10 00:00 |
01:14:00.80 |
-58:59:27.9 |
HIP 5561 |
24.30 |
| 2026-10-10 12:00 |
01:13:54.48 |
-58:59:36.9 |
HIP 5561 |
23.52 |
| 2026-10-11 00:00 |
01:13:48.15 |
-58:59:45.5 |
HIP 5561 |
22.76 |