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) |
| 2026-09-20 00:00 |
17:52:24.18 |
+48:53:06.5 |
HIP 87416 |
23.93 |
| 2026-09-20 12:00 |
17:52:23.75 |
+48:52:06.1 |
HIP 87416 |
24.90 |
| 2026-09-21 00:00 |
17:52:23.39 |
+48:51:05.7 |
HIP 87618 |
25.07 |
| 2026-09-21 12:00 |
17:52:23.08 |
+48:50:05.3 |
HIP 87618 |
24.31 |
| 2026-09-22 00:00 |
17:52:22.82 |
+48:49:04.9 |
HIP 87618 |
23.57 |
| 2026-09-22 12:00 |
17:52:22.63 |
+48:48:04.6 |
HIP 87618 |
22.83 |
| 2026-09-23 00:00 |
17:52:22.49 |
+48:47:04.3 |
HIP 87618 |
22.11 |
| 2026-09-23 12:00 |
17:52:22.40 |
+48:46:04.0 |
HIP 87618 |
21.41 |
| 2026-09-24 00:00 |
17:52:22.38 |
+48:45:03.8 |
HIP 87618 |
20.73 |
| 2026-09-24 12:00 |
17:52:22.41 |
+48:44:03.6 |
HIP 87618 |
20.06 |
| 2026-09-25 00:00 |
17:52:22.50 |
+48:43:03.5 |
HIP 87618 |
19.42 |
| 2026-09-25 12:00 |
17:52:22.64 |
+48:42:03.4 |
HIP 87618 |
18.80 |
| 2026-09-26 00:00 |
17:52:22.84 |
+48:41:03.3 |
HIP 87618 |
18.21 |
| 2026-09-26 12:00 |
17:52:23.10 |
+48:40:03.4 |
HIP 87618 |
17.65 |
| 2026-09-27 00:00 |
17:52:23.41 |
+48:39:03.5 |
HIP 87618 |
17.13 |
| 2026-09-27 12:00 |
17:52:23.78 |
+48:38:03.6 |
HIP 87618 |
16.63 |
| 2026-09-28 00:00 |
17:52:24.20 |
+48:37:03.9 |
HIP 87618 |
16.18 |
| 2026-09-28 12:00 |
17:52:24.68 |
+48:36:04.2 |
HIP 87618 |
15.77 |
| 2026-09-29 00:00 |
17:52:25.22 |
+48:35:04.6 |
HIP 87618 |
15.40 |
| 2026-09-29 12:00 |
17:52:25.81 |
+48:34:05.0 |
HIP 87618 |
15.08 |
| 2026-09-30 00:00 |
17:52:26.46 |
+48:33:05.6 |
HIP 87618 |
14.81 |
| 2026-09-30 12:00 |
17:52:27.16 |
+48:32:06.2 |
HIP 87618 |
14.60 |
| 2026-10-01 00:00 |
17:52:27.92 |
+48:31:07.0 |
HIP 87618 |
14.44 |
| 2026-10-01 12:00 |
17:52:28.73 |
+48:30:07.9 |
HIP 87618 |
14.34 |
| 2026-10-02 00:00 |
17:52:29.60 |
+48:29:08.8 |
HIP 87618 |
14.30 |
| 2026-10-02 12:00 |
17:52:30.52 |
+48:28:09.9 |
HIP 87618 |
14.32 |
| 2026-10-03 00:00 |
17:52:31.50 |
+48:27:11.1 |
HIP 87618 |
14.40 |
| 2026-10-03 12:00 |
17:52:32.53 |
+48:26:12.4 |
HIP 87618 |
14.54 |
| 2026-10-04 00:00 |
17:52:33.61 |
+48:25:13.8 |
HIP 87618 |
14.74 |
| 2026-10-04 12:00 |
17:52:34.76 |
+48:24:15.4 |
HIP 87618 |
14.98 |
| 2026-10-05 00:00 |
17:52:35.95 |
+48:23:17.0 |
HIP 87618 |
15.28 |
| 2026-10-05 12:00 |
17:52:37.20 |
+48:22:18.9 |
HIP 87618 |
15.63 |
| 2026-10-06 00:00 |
17:52:38.50 |
+48:21:20.8 |
HIP 87618 |
16.03 |
| 2026-10-06 12:00 |
17:52:39.86 |
+48:20:22.9 |
HIP 87618 |
16.46 |
| 2026-10-07 00:00 |
17:52:41.27 |
+48:19:25.2 |
HIP 87618 |
16.94 |
| 2026-10-07 12:00 |
17:52:42.73 |
+48:18:27.6 |
HIP 87618 |
17.44 |
| 2026-10-08 00:00 |
17:52:44.25 |
+48:17:30.2 |
HIP 87618 |
17.99 |
| 2026-10-08 12:00 |
17:52:45.82 |
+48:16:32.9 |
HIP 87618 |
18.56 |
| 2026-10-09 00:00 |
17:52:47.45 |
+48:15:35.8 |
HIP 87618 |
19.15 |
| 2026-10-09 12:00 |
17:52:49.12 |
+48:14:38.9 |
HIP 87618 |
19.78 |
| 2026-10-10 00:00 |
17:52:50.85 |
+48:13:42.2 |
HIP 87618 |
20.42 |
| 2026-10-10 12:00 |
17:52:52.63 |
+48:12:45.6 |
HIP 87618 |
21.08 |
| 2026-10-11 00:00 |
17:52:54.47 |
+48:11:49.3 |
HIP 87618 |
21.76 |