メタデータ
| 項目 |
値 |
| Designation |
499P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-03-04T09:55:03.910080Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:43:01Z |
| Obs used |
468 |
| NEO |
Yes |
| M1 |
19.600 |
| K1 |
4.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2024-02-28.0000000 |
| e |
0.69137458 |
| q (au) |
0.930634 |
| a (au) |
3.015417 |
| i (deg) |
24.586385 |
| Ω (om, deg) |
139.328525 |
| ω (w, deg) |
2.563338 |
| M (ma, deg) |
290.278038 |
等級
散乱 + 全体線形
$$
M_a = (19.673 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.673 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-25 00:00 |
19:26:11.76 |
-13:55:58.3 |
HIP 95485 |
12.37 |
| 2026-09-25 12:00 |
19:26:12.19 |
-13:57:41.6 |
HIP 95485 |
12.88 |
| 2026-09-26 00:00 |
19:26:12.86 |
-13:59:24.2 |
HIP 95485 |
13.64 |
| 2026-09-26 12:00 |
19:26:13.77 |
-14:01:05.8 |
HIP 95485 |
14.60 |
| 2026-09-27 00:00 |
19:26:14.90 |
-14:02:46.7 |
HIP 95485 |
15.73 |
| 2026-09-27 12:00 |
19:26:16.27 |
-14:04:26.8 |
HIP 95485 |
16.99 |
| 2026-09-28 00:00 |
19:26:17.87 |
-14:06:06.0 |
HIP 95485 |
18.36 |
| 2026-09-28 12:00 |
19:26:19.70 |
-14:07:44.4 |
HIP 95485 |
19.80 |
| 2026-09-29 00:00 |
19:26:21.75 |
-14:09:22.1 |
HIP 95485 |
21.32 |
| 2026-09-29 12:00 |
19:26:24.04 |
-14:10:58.8 |
HIP 95574 |
22.09 |
| 2026-09-30 00:00 |
19:26:26.56 |
-14:12:34.8 |
HIP 95574 |
20.50 |
| 2026-09-30 12:00 |
19:26:29.30 |
-14:14:09.9 |
HIP 95574 |
18.94 |
| 2026-10-01 00:00 |
19:26:32.27 |
-14:15:44.3 |
HIP 95574 |
17.43 |
| 2026-10-01 12:00 |
19:26:35.46 |
-14:17:17.7 |
HIP 95574 |
16.00 |
| 2026-10-02 00:00 |
19:26:38.88 |
-14:18:50.4 |
HIP 95574 |
14.65 |
| 2026-10-02 12:00 |
19:26:42.52 |
-14:20:22.2 |
HIP 95574 |
13.43 |
| 2026-10-03 00:00 |
19:26:46.39 |
-14:21:53.3 |
HIP 95574 |
12.37 |
| 2026-10-03 12:00 |
19:26:50.47 |
-14:23:23.4 |
HIP 95574 |
11.54 |
| 2026-10-04 00:00 |
19:26:54.78 |
-14:24:52.8 |
HIP 95574 |
10.98 |
| 2026-10-04 12:00 |
19:26:59.31 |
-14:26:21.3 |
HIP 95574 |
10.77 |
| 2026-10-05 00:00 |
19:27:04.06 |
-14:27:49.0 |
HIP 95574 |
10.91 |
| 2026-10-05 12:00 |
19:27:09.02 |
-14:29:15.8 |
HIP 95574 |
11.42 |
| 2026-10-06 00:00 |
19:27:14.21 |
-14:30:41.8 |
HIP 95574 |
12.25 |
| 2026-10-06 12:00 |
19:27:19.61 |
-14:32:07.0 |
HIP 95574 |
13.36 |
| 2026-10-07 00:00 |
19:27:25.22 |
-14:33:31.3 |
HIP 95574 |
14.69 |
| 2026-10-07 12:00 |
19:27:31.06 |
-14:34:54.8 |
HIP 95574 |
16.20 |
| 2026-10-08 00:00 |
19:27:37.10 |
-14:36:17.5 |
HIP 95574 |
17.85 |
| 2026-10-08 12:00 |
19:27:43.36 |
-14:37:39.3 |
HIP 95574 |
19.61 |
| 2026-10-09 00:00 |
19:27:49.83 |
-14:39:00.2 |
HIP 95574 |
21.47 |
| 2026-10-09 12:00 |
19:27:56.51 |
-14:40:20.3 |
HIP 95574 |
23.41 |
| 2026-10-10 00:00 |
19:28:03.41 |
-14:41:39.6 |
HIP 95574 |
25.41 |
| 2026-10-10 12:00 |
19:28:10.51 |
-14:42:58.0 |
HIP 95755 |
23.93 |
| 2026-10-11 00:00 |
19:28:17.81 |
-14:44:15.6 |
HIP 95755 |
22.28 |
| 2026-10-11 12:00 |
19:28:25.33 |
-14:45:32.3 |
HIP 95755 |
20.74 |
| 2026-10-12 00:00 |
19:28:33.05 |
-14:46:48.2 |
HIP 95755 |
19.34 |
| 2026-10-12 12:00 |
19:28:40.97 |
-14:48:03.2 |
HIP 95755 |
18.14 |
| 2026-10-13 00:00 |
19:28:49.10 |
-14:49:17.4 |
HIP 95755 |
17.17 |
| 2026-10-13 12:00 |
19:28:57.42 |
-14:50:30.7 |
HIP 95755 |
16.51 |
| 2026-10-14 00:00 |
19:29:05.95 |
-14:51:43.2 |
HIP 95755 |
16.20 |
| 2026-10-14 12:00 |
19:29:14.68 |
-14:52:54.8 |
HIP 95755 |
16.28 |
| 2026-10-15 00:00 |
19:29:23.61 |
-14:54:05.6 |
HIP 95755 |
16.76 |
| 2026-10-15 12:00 |
19:29:32.73 |
-14:55:15.6 |
HIP 95755 |
17.62 |
| 2026-10-16 00:00 |
19:29:42.04 |
-14:56:24.6 |
HIP 95755 |
18.82 |