メタデータ
| 項目 |
値 |
| Designation |
C/2014 AA52 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2015-02-27T15:22:13.177920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:46Z |
| Obs used |
399 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-10-20.0000000 |
| e |
1.00042389 |
| q (au) |
2.002638 |
| a (au) |
-4724.452107 |
| i (deg) |
105.211201 |
| Ω (om, deg) |
330.493052 |
| ω (w, deg) |
292.259254 |
| M (ma, deg) |
-0.000397 |
等級
散乱 + 全体線形
$$
M_a = (11.277 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.277 |
| n |
2.000 |
| gf |
0.997 |
| gb |
-0.501 |
| k |
1.000 |
| δ90 |
9.999 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
17:58:24.49 |
+50:25:12.1 |
HIP 87951 |
6.86 |
| 2026-07-29 12:00 |
17:58:18.50 |
+50:24:36.2 |
HIP 87951 |
5.86 |
| 2026-07-30 00:00 |
17:58:12.55 |
+50:23:59.8 |
HIP 87951 |
4.90 |
| 2026-07-30 12:00 |
17:58:06.64 |
+50:23:22.9 |
HIP 87951 |
4.03 |
| 2026-07-31 00:00 |
17:58:00.77 |
+50:22:45.7 |
HIP 87951 |
3.31 |
| 2026-07-31 12:00 |
17:57:54.94 |
+50:22:08.0 |
HIP 87951 |
2.85 |
| 2026-08-01 00:00 |
17:57:49.15 |
+50:21:29.8 |
HIP 87951 |
2.78 |
| 2026-08-01 12:00 |
17:57:43.41 |
+50:20:51.3 |
HIP 87951 |
3.14 |
| 2026-08-02 00:00 |
17:57:37.70 |
+50:20:12.3 |
HIP 87951 |
3.79 |
| 2026-08-02 12:00 |
17:57:32.03 |
+50:19:32.9 |
HIP 87951 |
4.62 |
| 2026-08-03 00:00 |
17:57:26.41 |
+50:18:53.1 |
HIP 87951 |
5.55 |
| 2026-08-03 12:00 |
17:57:20.83 |
+50:18:12.9 |
HIP 87951 |
6.53 |
| 2026-08-04 00:00 |
17:57:15.29 |
+50:17:32.3 |
HIP 87951 |
7.55 |
| 2026-08-04 12:00 |
17:57:09.79 |
+50:16:51.3 |
HIP 87951 |
8.58 |
| 2026-08-05 00:00 |
17:57:04.34 |
+50:16:09.8 |
HIP 87951 |
9.63 |
| 2026-08-05 12:00 |
17:56:58.93 |
+50:15:28.0 |
HIP 87951 |
10.69 |
| 2026-08-06 00:00 |
17:56:53.57 |
+50:14:45.8 |
HIP 87951 |
11.75 |
| 2026-08-06 12:00 |
17:56:48.25 |
+50:14:03.1 |
HIP 87951 |
12.82 |
| 2026-08-07 00:00 |
17:56:42.97 |
+50:13:20.1 |
HIP 87951 |
13.89 |
| 2026-08-07 12:00 |
17:56:37.74 |
+50:12:36.7 |
HIP 87951 |
14.96 |
| 2026-08-08 00:00 |
17:56:32.56 |
+50:11:53.0 |
HIP 87951 |
16.03 |
| 2026-08-08 12:00 |
17:56:27.42 |
+50:11:08.8 |
HIP 87951 |
17.11 |
| 2026-08-09 00:00 |
17:56:22.33 |
+50:10:24.3 |
HIP 87951 |
18.19 |
| 2026-08-09 12:00 |
17:56:17.29 |
+50:09:39.4 |
HIP 87951 |
19.26 |
| 2026-08-10 00:00 |
17:56:12.29 |
+50:08:54.1 |
HIP 87951 |
20.34 |
| 2026-08-10 12:00 |
17:56:07.34 |
+50:08:08.4 |
HIP 87951 |
21.41 |
| 2026-08-11 00:00 |
17:56:02.44 |
+50:07:22.4 |
HIP 87951 |
22.49 |
| 2026-08-11 12:00 |
17:55:57.58 |
+50:06:36.1 |
HIP 87951 |
23.56 |
| 2026-08-12 00:00 |
17:55:52.78 |
+50:05:49.4 |
HIP 87951 |
24.63 |
| 2026-08-12 12:00 |
17:55:48.02 |
+50:05:02.3 |
HIP 87629 |
24.46 |
| 2026-08-13 00:00 |
17:55:43.31 |
+50:04:14.9 |
HIP 87629 |
23.37 |
| 2026-08-13 12:00 |
17:55:38.65 |
+50:03:27.2 |
HIP 87629 |
22.28 |
| 2026-08-14 00:00 |
17:55:34.05 |
+50:02:39.2 |
HIP 87629 |
21.19 |
| 2026-08-14 12:00 |
17:55:29.49 |
+50:01:50.8 |
HIP 87629 |
20.10 |
| 2026-08-15 00:00 |
17:55:24.98 |
+50:01:02.0 |
HIP 87629 |
19.02 |
| 2026-08-15 12:00 |
17:55:20.52 |
+50:00:13.0 |
HIP 87629 |
17.94 |
| 2026-08-16 00:00 |
17:55:16.12 |
+49:59:23.6 |
HIP 87629 |
16.85 |
| 2026-08-16 12:00 |
17:55:11.76 |
+49:58:34.0 |
HIP 87629 |
15.78 |
| 2026-08-17 00:00 |
17:55:07.46 |
+49:57:44.0 |
HIP 87629 |
14.70 |
| 2026-08-17 12:00 |
17:55:03.21 |
+49:56:53.7 |
HIP 87629 |
13.63 |
| 2026-08-18 00:00 |
17:54:59.01 |
+49:56:03.1 |
HIP 87629 |
12.57 |
| 2026-08-18 12:00 |
17:54:54.86 |
+49:55:12.3 |
HIP 87629 |
11.51 |
| 2026-08-19 00:00 |
17:54:50.77 |
+49:54:21.1 |
HIP 87629 |
10.45 |