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) |
| 2026-07-29 00:00 |
08:01:12.36 |
+17:56:42.1 |
HIP 39169 |
19.49 |
| 2026-07-29 12:00 |
08:01:52.22 |
+17:54:10.6 |
HIP 39169 |
26.59 |
| 2026-07-30 00:00 |
08:02:32.04 |
+17:51:38.5 |
HIP 39434 |
18.10 |
| 2026-07-30 12:00 |
08:03:11.82 |
+17:49:05.9 |
HIP 39434 |
8.71 |
| 2026-07-31 00:00 |
08:03:51.55 |
+17:46:32.6 |
HIP 39434 |
4.05 |
| 2026-07-31 12:00 |
08:04:31.24 |
+17:43:58.8 |
HIP 39434 |
12.20 |
| 2026-08-01 00:00 |
08:05:10.89 |
+17:41:24.5 |
HIP 39587 |
4.86 |
| 2026-08-01 12:00 |
08:05:50.50 |
+17:38:49.5 |
HIP 39587 |
6.99 |
| 2026-08-02 00:00 |
08:06:30.06 |
+17:36:14.0 |
HIP 39587 |
16.29 |
| 2026-08-02 12:00 |
08:07:09.57 |
+17:33:38.0 |
HIP 39737 |
23.02 |
| 2026-08-03 00:00 |
08:07:49.04 |
+17:31:01.4 |
HIP 39737 |
21.53 |
| 2026-08-03 12:00 |
08:08:28.47 |
+17:28:24.2 |
HIP 39737 |
24.24 |
| 2026-08-04 00:00 |
08:09:07.85 |
+17:25:46.5 |
HIP 39982 |
15.44 |
| 2026-08-04 12:00 |
08:09:47.18 |
+17:23:08.2 |
HIP 39982 |
8.23 |
| 2026-08-05 00:00 |
08:10:26.46 |
+17:20:29.4 |
HIP 39982 |
9.32 |
| 2026-08-05 12:00 |
08:11:05.70 |
+17:17:50.1 |
HIP 39982 |
17.19 |
| 2026-08-06 00:00 |
08:11:44.89 |
+17:15:10.2 |
HIP 40113 |
15.47 |
| 2026-08-06 12:00 |
08:12:24.03 |
+17:12:29.7 |
HIP 40113 |
17.19 |
| 2026-08-07 00:00 |
08:13:03.12 |
+17:09:48.8 |
HIP 40113 |
23.24 |
| 2026-08-07 12:00 |
08:13:42.16 |
+17:07:07.3 |
HIP 40289 |
28.32 |
| 2026-08-08 00:00 |
08:14:21.15 |
+17:04:25.3 |
HIP 40289 |
27.62 |
| 2026-08-08 12:00 |
08:15:00.09 |
+17:01:42.7 |
HIP 40289 |
30.20 |
| 2026-08-09 00:00 |
08:15:38.98 |
+16:58:59.7 |
HIP 40289 |
35.33 |
| 2026-08-09 12:00 |
08:16:17.81 |
+16:56:16.1 |
HIP 40458 |
39.14 |
| 2026-08-10 00:00 |
08:16:56.59 |
+16:53:32.0 |
HIP 40458 |
44.75 |
| 2026-08-10 12:00 |
08:17:35.32 |
+16:50:47.5 |
HIP 40904 |
46.78 |
| 2026-08-11 00:00 |
08:18:14.00 |
+16:48:02.4 |
HIP 40904 |
38.19 |
| 2026-08-11 12:00 |
08:18:52.62 |
+16:45:16.8 |
HIP 40904 |
30.25 |
| 2026-08-12 00:00 |
08:19:31.18 |
+16:42:30.7 |
HIP 40904 |
23.63 |
| 2026-08-12 12:00 |
08:20:09.69 |
+16:39:44.2 |
HIP 40904 |
19.69 |
| 2026-08-13 00:00 |
08:20:48.14 |
+16:36:57.1 |
HIP 40904 |
20.06 |
| 2026-08-13 12:00 |
08:21:26.53 |
+16:34:09.6 |
HIP 40904 |
24.54 |
| 2026-08-14 00:00 |
08:22:04.87 |
+16:31:21.6 |
HIP 41040 |
22.56 |
| 2026-08-14 12:00 |
08:22:43.14 |
+16:28:33.1 |
HIP 41040 |
18.99 |
| 2026-08-15 00:00 |
08:23:21.36 |
+16:25:44.2 |
HIP 41040 |
19.91 |
| 2026-08-15 12:00 |
08:23:59.51 |
+16:22:54.8 |
HIP 41040 |
24.81 |
| 2026-08-16 00:00 |
08:24:37.61 |
+16:20:04.9 |
HIP 41040 |
31.89 |
| 2026-08-16 12:00 |
08:25:15.64 |
+16:17:14.6 |
HIP 41040 |
40.01 |
| 2026-08-17 00:00 |
08:25:53.61 |
+16:14:23.9 |
HIP 41492 |
33.84 |
| 2026-08-17 12:00 |
08:26:31.52 |
+16:11:32.7 |
HIP 41492 |
25.18 |
| 2026-08-18 00:00 |
08:27:09.37 |
+16:08:41.1 |
HIP 41492 |
17.47 |
| 2026-08-18 12:00 |
08:27:47.15 |
+16:05:49.0 |
HIP 41492 |
12.56 |
| 2026-08-19 00:00 |
08:28:24.86 |
+16:02:56.5 |
HIP 41492 |
13.82 |