メタデータ
| 項目 |
値 |
| Designation |
C/2009 Y1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-01-28T21:38:30.526080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:38Z |
| Obs used |
1677 |
| NEO |
- |
| M1 |
6.400 |
| K1 |
14.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-01-30.0000000 |
| e |
0.99328974 |
| q (au) |
2.520495 |
| a (au) |
375.617800 |
| i (deg) |
107.316562 |
| Ω (om, deg) |
160.277046 |
| ω (w, deg) |
127.391328 |
| M (ma, deg) |
0.000149 |
等級
散乱 + 全体線形
$$
M_a = (8.103 + 5.550\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.103 |
| n |
5.550 |
| gf |
0.972 |
| gb |
-0.618 |
| k |
0.800 |
| δ90 |
9.039 |
| 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 |
| 2009-12-17 |
2010-03-31 |
-6.0830 |
+4.086 |
| 2010-03-31 |
2010-08-16 |
+4.8976 |
-2.662 |
| 2010-08-16 |
2011-01-28 |
-4.5458 |
+1.824 |
| 2011-01-29 |
2011-07-12 |
+1.5191 |
-0.975 |
| 2011-07-12 |
2011-12-23 |
-8.7976 |
+4.473 |
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) |
| 2026-09-25 00:00 |
09:43:22.99 |
-74:21:42.0 |
HIP 47832 |
13.81 |
| 2026-09-25 12:00 |
09:43:32.98 |
-74:22:13.3 |
HIP 47832 |
13.04 |
| 2026-09-26 00:00 |
09:43:42.91 |
-74:22:45.0 |
HIP 47832 |
12.28 |
| 2026-09-26 12:00 |
09:43:52.77 |
-74:23:17.0 |
HIP 47832 |
11.53 |
| 2026-09-27 00:00 |
09:44:02.58 |
-74:23:49.3 |
HIP 47832 |
10.78 |
| 2026-09-27 12:00 |
09:44:12.33 |
-74:24:21.9 |
HIP 47832 |
10.05 |
| 2026-09-28 00:00 |
09:44:22.01 |
-74:24:54.8 |
HIP 47832 |
9.34 |
| 2026-09-28 12:00 |
09:44:31.64 |
-74:25:28.1 |
HIP 47832 |
8.65 |
| 2026-09-29 00:00 |
09:44:41.20 |
-74:26:01.6 |
HIP 47832 |
7.99 |
| 2026-09-29 12:00 |
09:44:50.70 |
-74:26:35.5 |
HIP 47832 |
7.35 |
| 2026-09-30 00:00 |
09:45:00.13 |
-74:27:09.7 |
HIP 47832 |
6.76 |
| 2026-09-30 12:00 |
09:45:09.51 |
-74:27:44.2 |
HIP 47832 |
6.23 |
| 2026-10-01 00:00 |
09:45:18.81 |
-74:28:18.9 |
HIP 47832 |
5.76 |
| 2026-10-01 12:00 |
09:45:28.05 |
-74:28:54.0 |
HIP 47832 |
5.39 |
| 2026-10-02 00:00 |
09:45:37.23 |
-74:29:29.4 |
HIP 47832 |
5.12 |
| 2026-10-02 12:00 |
09:45:46.34 |
-74:30:05.1 |
HIP 47832 |
4.97 |
| 2026-10-03 00:00 |
09:45:55.38 |
-74:30:41.1 |
HIP 47832 |
4.97 |
| 2026-10-03 12:00 |
09:46:04.35 |
-74:31:17.3 |
HIP 47832 |
5.09 |
| 2026-10-04 00:00 |
09:46:13.26 |
-74:31:53.9 |
HIP 47832 |
5.35 |
| 2026-10-04 12:00 |
09:46:22.09 |
-74:32:30.7 |
HIP 47832 |
5.71 |
| 2026-10-05 00:00 |
09:46:30.86 |
-74:33:07.9 |
HIP 47832 |
6.17 |
| 2026-10-05 12:00 |
09:46:39.55 |
-74:33:45.3 |
HIP 47832 |
6.70 |
| 2026-10-06 00:00 |
09:46:48.18 |
-74:34:23.0 |
HIP 47832 |
7.28 |
| 2026-10-06 12:00 |
09:46:56.73 |
-74:35:01.0 |
HIP 47832 |
7.91 |
| 2026-10-07 00:00 |
09:47:05.20 |
-74:35:39.3 |
HIP 47832 |
8.57 |
| 2026-10-07 12:00 |
09:47:13.61 |
-74:36:17.8 |
HIP 47832 |
9.26 |
| 2026-10-08 00:00 |
09:47:21.94 |
-74:36:56.6 |
HIP 47832 |
9.97 |
| 2026-10-08 12:00 |
09:47:30.20 |
-74:37:35.7 |
HIP 47832 |
10.69 |
| 2026-10-09 00:00 |
09:47:38.38 |
-74:38:15.1 |
HIP 47832 |
11.43 |
| 2026-10-09 12:00 |
09:47:46.48 |
-74:38:54.7 |
HIP 48149 |
12.16 |
| 2026-10-10 00:00 |
09:47:54.51 |
-74:39:34.6 |
HIP 48149 |
11.35 |
| 2026-10-10 12:00 |
09:48:02.45 |
-74:40:14.7 |
HIP 48149 |
10.54 |
| 2026-10-11 00:00 |
09:48:10.32 |
-74:40:55.1 |
HIP 48149 |
9.74 |
| 2026-10-11 12:00 |
09:48:18.12 |
-74:41:35.8 |
HIP 48149 |
8.94 |
| 2026-10-12 00:00 |
09:48:25.83 |
-74:42:16.7 |
HIP 48149 |
8.16 |
| 2026-10-12 12:00 |
09:48:33.46 |
-74:42:57.9 |
HIP 48149 |
7.38 |
| 2026-10-13 00:00 |
09:48:41.01 |
-74:43:39.3 |
HIP 48149 |
6.62 |
| 2026-10-13 12:00 |
09:48:48.48 |
-74:44:20.9 |
HIP 48149 |
5.88 |
| 2026-10-14 00:00 |
09:48:55.87 |
-74:45:02.8 |
HIP 48149 |
5.16 |
| 2026-10-14 12:00 |
09:49:03.17 |
-74:45:44.9 |
HIP 48149 |
4.49 |
| 2026-10-15 00:00 |
09:49:10.39 |
-74:46:27.3 |
HIP 48149 |
3.89 |
| 2026-10-15 12:00 |
09:49:17.53 |
-74:47:09.9 |
HIP 48149 |
3.39 |
| 2026-10-16 00:00 |
09:49:24.58 |
-74:47:52.7 |
HIP 48149 |
3.04 |