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) |
| 2026-05-12 00:00 |
20:34:31.59 |
-06:30:52.3 |
HIP 101436 |
24.14 |
| 2026-05-12 12:00 |
20:34:31.72 |
-06:30:20.9 |
HIP 101436 |
23.78 |
| 2026-05-13 00:00 |
20:34:31.60 |
-06:29:50.5 |
HIP 101436 |
23.40 |
| 2026-05-13 12:00 |
20:34:31.22 |
-06:29:21.3 |
HIP 101436 |
22.99 |
| 2026-05-14 00:00 |
20:34:30.59 |
-06:28:53.2 |
HIP 101436 |
22.55 |
| 2026-05-14 12:00 |
20:34:29.70 |
-06:28:26.1 |
HIP 101436 |
22.08 |
| 2026-05-15 00:00 |
20:34:28.55 |
-06:28:00.2 |
HIP 101436 |
21.57 |
| 2026-05-15 12:00 |
20:34:27.15 |
-06:27:35.5 |
HIP 101436 |
21.04 |
| 2026-05-16 00:00 |
20:34:25.49 |
-06:27:11.9 |
HIP 101436 |
20.46 |
| 2026-05-16 12:00 |
20:34:23.56 |
-06:26:49.4 |
HIP 101436 |
19.86 |
| 2026-05-17 00:00 |
20:34:21.38 |
-06:26:28.1 |
HIP 101436 |
19.22 |
| 2026-05-17 12:00 |
20:34:18.94 |
-06:26:08.0 |
HIP 101436 |
18.56 |
| 2026-05-18 00:00 |
20:34:16.24 |
-06:25:49.1 |
HIP 101436 |
17.86 |
| 2026-05-18 12:00 |
20:34:13.29 |
-06:25:31.4 |
HIP 101436 |
17.13 |
| 2026-05-19 00:00 |
20:34:10.07 |
-06:25:14.9 |
HIP 101436 |
16.38 |
| 2026-05-19 12:00 |
20:34:06.59 |
-06:24:59.6 |
HIP 101436 |
15.62 |
| 2026-05-20 00:00 |
20:34:02.85 |
-06:24:45.5 |
HIP 101436 |
14.85 |
| 2026-05-20 12:00 |
20:33:58.85 |
-06:24:32.6 |
HIP 101436 |
14.07 |
| 2026-05-21 00:00 |
20:33:54.60 |
-06:24:21.0 |
HIP 101436 |
13.31 |
| 2026-05-21 12:00 |
20:33:50.08 |
-06:24:10.6 |
HIP 101436 |
12.59 |
| 2026-05-22 00:00 |
20:33:45.31 |
-06:24:01.5 |
HIP 101436 |
11.92 |
| 2026-05-22 12:00 |
20:33:40.27 |
-06:23:53.6 |
HIP 101436 |
11.34 |
| 2026-05-23 00:00 |
20:33:34.98 |
-06:23:47.0 |
HIP 101436 |
10.88 |
| 2026-05-23 12:00 |
20:33:29.43 |
-06:23:41.7 |
HIP 101436 |
10.58 |
| 2026-05-24 00:00 |
20:33:23.62 |
-06:23:37.7 |
HIP 101436 |
10.47 |
| 2026-05-24 12:00 |
20:33:17.55 |
-06:23:34.9 |
HIP 101436 |
10.60 |
| 2026-05-25 00:00 |
20:33:11.22 |
-06:23:33.4 |
HIP 101436 |
10.98 |
| 2026-05-25 12:00 |
20:33:04.64 |
-06:23:33.3 |
HIP 101436 |
11.62 |
| 2026-05-26 00:00 |
20:32:57.80 |
-06:23:34.4 |
HIP 101436 |
12.48 |
| 2026-05-26 12:00 |
20:32:50.70 |
-06:23:36.8 |
HIP 101436 |
13.57 |
| 2026-05-27 00:00 |
20:32:43.34 |
-06:23:40.6 |
HIP 101436 |
14.85 |
| 2026-05-27 12:00 |
20:32:35.73 |
-06:23:45.7 |
HIP 101436 |
16.29 |
| 2026-05-28 00:00 |
20:32:27.86 |
-06:23:52.1 |
HIP 101436 |
17.89 |
| 2026-05-28 12:00 |
20:32:19.73 |
-06:23:59.8 |
HIP 101436 |
19.61 |
| 2026-05-29 00:00 |
20:32:11.35 |
-06:24:08.9 |
HIP 101436 |
21.46 |
| 2026-05-29 12:00 |
20:32:02.72 |
-06:24:19.4 |
HIP 101436 |
23.41 |
| 2026-05-30 00:00 |
20:31:53.83 |
-06:24:31.2 |
HIP 101436 |
25.46 |
| 2026-05-30 12:00 |
20:31:44.68 |
-06:24:44.3 |
HIP 101436 |
27.61 |
| 2026-05-31 00:00 |
20:31:35.28 |
-06:24:58.8 |
HIP 101436 |
29.84 |
| 2026-05-31 12:00 |
20:31:25.63 |
-06:25:14.7 |
HIP 101436 |
32.15 |
| 2026-06-01 00:00 |
20:31:15.72 |
-06:25:32.0 |
HIP 101436 |
34.55 |
| 2026-06-01 12:00 |
20:31:05.56 |
-06:25:50.6 |
HIP 101189 |
36.87 |
| 2026-06-02 00:00 |
20:30:55.15 |
-06:26:10.6 |
HIP 101189 |
36.83 |