メタデータ
| 項目 |
値 |
| Designation |
509P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2026-04-15T12:31:52.705920Z |
| Orbit solution date (soln_date, UTC) |
2026-04-27T13:42:38Z |
| Obs used |
610 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
16.000 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2007-02-09T03:20:31.200000Z |
| Discovery magnitude (MPC) |
18.70 N |
| Discovery observatory (MPC) |
703 · University of Arizona Catalina Sky Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-02-24.0000000 |
| e |
0.46351396 |
| q (au) |
3.767292 |
| a (au) |
7.022162 |
| i (deg) |
8.712165 |
| Ω (om, deg) |
275.824612 |
| ω (w, deg) |
179.536914 |
| M (ma, deg) |
183.224564 |
等級
散乱 + 全体線形
$$
M_a = (7.367 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.367 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.792 |
| k |
0.999 |
| 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 |
| 2024-10-03 |
2026-03-29 |
+9.7613 |
-5.661 |
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) |
| 2026-06-01 00:00 |
06:41:53.26 |
+21:35:18.5 |
HIP 32164 |
15.26 |
| 2026-06-01 12:00 |
06:42:34.03 |
+21:34:05.3 |
HIP 32164 |
5.97 |
| 2026-06-02 00:00 |
06:43:14.84 |
+21:32:51.5 |
HIP 32164 |
4.59 |
| 2026-06-02 12:00 |
06:43:55.68 |
+21:31:36.9 |
HIP 32164 |
13.78 |
| 2026-06-03 00:00 |
06:44:36.55 |
+21:30:21.7 |
HIP 32164 |
23.29 |
| 2026-06-03 12:00 |
06:45:17.44 |
+21:29:05.7 |
HIP 32164 |
32.86 |
| 2026-06-04 00:00 |
06:45:58.36 |
+21:27:49.1 |
HIP 32571 |
28.83 |
| 2026-06-04 12:00 |
06:46:39.31 |
+21:26:31.8 |
HIP 32571 |
21.80 |
| 2026-06-05 00:00 |
06:47:20.28 |
+21:25:13.8 |
HIP 32571 |
17.45 |
| 2026-06-05 12:00 |
06:48:01.28 |
+21:23:55.1 |
HIP 32571 |
17.87 |
| 2026-06-06 00:00 |
06:48:42.31 |
+21:22:35.7 |
HIP 32571 |
22.79 |
| 2026-06-06 12:00 |
06:49:23.35 |
+21:21:15.6 |
HIP 32885 |
24.75 |
| 2026-06-07 00:00 |
06:50:04.43 |
+21:19:54.9 |
HIP 32885 |
15.88 |
| 2026-06-07 12:00 |
06:50:45.52 |
+21:18:33.4 |
HIP 32885 |
8.85 |
| 2026-06-08 00:00 |
06:51:26.64 |
+21:17:11.2 |
HIP 32885 |
9.56 |
| 2026-06-08 12:00 |
06:52:07.78 |
+21:15:48.3 |
HIP 32885 |
17.08 |
| 2026-06-09 00:00 |
06:52:48.93 |
+21:14:24.8 |
HIP 33179 |
22.04 |
| 2026-06-09 12:00 |
06:53:30.11 |
+21:13:00.5 |
HIP 33179 |
12.39 |
| 2026-06-10 00:00 |
06:54:11.31 |
+21:11:35.5 |
HIP 33179 |
3.01 |
| 2026-06-10 12:00 |
06:54:52.53 |
+21:10:09.8 |
HIP 33179 |
7.30 |
| 2026-06-11 00:00 |
06:55:33.77 |
+21:08:43.4 |
HIP 33179 |
16.92 |
| 2026-06-11 12:00 |
06:56:15.02 |
+21:07:16.3 |
HIP 33399 |
12.11 |
| 2026-06-12 00:00 |
06:56:56.29 |
+21:05:48.5 |
HIP 33399 |
7.98 |
| 2026-06-12 12:00 |
06:57:37.58 |
+21:04:20.0 |
HIP 33531 |
7.34 |
| 2026-06-13 00:00 |
06:58:18.88 |
+21:02:50.7 |
HIP 33531 |
4.56 |
| 2026-06-13 12:00 |
06:59:00.20 |
+21:01:20.8 |
HIP 33531 |
13.34 |
| 2026-06-14 00:00 |
06:59:41.53 |
+20:59:50.2 |
HIP 33531 |
22.93 |
| 2026-06-14 12:00 |
07:00:22.87 |
+20:58:18.8 |
HIP 33906 |
27.23 |
| 2026-06-15 00:00 |
07:01:04.22 |
+20:56:46.7 |
HIP 33906 |
17.66 |
| 2026-06-15 12:00 |
07:01:45.59 |
+20:55:13.9 |
HIP 33906 |
8.55 |
| 2026-06-16 00:00 |
07:02:26.97 |
+20:53:40.4 |
HIP 33906 |
5.08 |
| 2026-06-16 12:00 |
07:03:08.35 |
+20:52:06.2 |
HIP 33906 |
13.05 |
| 2026-06-17 00:00 |
07:03:49.75 |
+20:50:31.3 |
HIP 34088 |
16.77 |
| 2026-06-17 12:00 |
07:04:31.15 |
+20:48:55.7 |
HIP 34088 |
15.80 |
| 2026-06-18 00:00 |
07:05:12.56 |
+20:47:19.3 |
HIP 34218 |
14.11 |
| 2026-06-18 12:00 |
07:05:53.97 |
+20:45:42.3 |
HIP 34218 |
14.36 |
| 2026-06-19 00:00 |
07:06:35.39 |
+20:44:04.5 |
HIP 34369 |
17.63 |
| 2026-06-19 12:00 |
07:07:16.82 |
+20:42:26.1 |
HIP 34369 |
11.62 |
| 2026-06-20 00:00 |
07:07:58.24 |
+20:40:46.9 |
HIP 34433 |
12.22 |
| 2026-06-20 12:00 |
07:08:39.68 |
+20:39:07.0 |
HIP 34433 |
13.68 |
| 2026-06-21 00:00 |
07:09:21.11 |
+20:37:26.4 |
HIP 34433 |
20.45 |
| 2026-06-21 12:00 |
07:10:02.54 |
+20:35:45.1 |
HIP 34653 |
12.32 |
| 2026-06-22 00:00 |
07:10:43.98 |
+20:34:03.1 |
HIP 34653 |
7.71 |