メタデータ
| 項目 |
値 |
| Designation |
C/2014 J1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2014-06-20T00:22:18.560640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:54Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
16.800 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-05-17.0000000 |
| e |
0.80239339 |
| q (au) |
1.708541 |
| a (au) |
8.646176 |
| i (deg) |
159.696475 |
| Ω (om, deg) |
41.942129 |
| ω (w, deg) |
195.480026 |
| M (ma, deg) |
358.681304 |
等級
散乱 + 全体線形
$$
M_a = (19.181 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.181 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.553 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
01:55:06.79 |
+16:56:00.1 |
HIP 8968 |
16.43 |
| 2026-07-29 12:00 |
01:55:05.21 |
+16:56:06.5 |
HIP 8968 |
16.47 |
| 2026-07-30 00:00 |
01:55:03.57 |
+16:56:12.5 |
HIP 8968 |
16.53 |
| 2026-07-30 12:00 |
01:55:01.86 |
+16:56:18.2 |
HIP 8968 |
16.61 |
| 2026-07-31 00:00 |
01:55:00.09 |
+16:56:23.6 |
HIP 8968 |
16.71 |
| 2026-07-31 12:00 |
01:54:58.25 |
+16:56:28.7 |
HIP 8968 |
16.84 |
| 2026-08-01 00:00 |
01:54:56.36 |
+16:56:33.4 |
HIP 8968 |
16.98 |
| 2026-08-01 12:00 |
01:54:54.39 |
+16:56:37.8 |
HIP 8968 |
17.16 |
| 2026-08-02 00:00 |
01:54:52.37 |
+16:56:41.9 |
HIP 8968 |
17.35 |
| 2026-08-02 12:00 |
01:54:50.28 |
+16:56:45.6 |
HIP 8968 |
17.57 |
| 2026-08-03 00:00 |
01:54:48.12 |
+16:56:48.9 |
HIP 8968 |
17.82 |
| 2026-08-03 12:00 |
01:54:45.90 |
+16:56:52.0 |
HIP 8968 |
18.09 |
| 2026-08-04 00:00 |
01:54:43.62 |
+16:56:54.7 |
HIP 8968 |
18.39 |
| 2026-08-04 12:00 |
01:54:41.27 |
+16:56:57.0 |
HIP 8968 |
18.71 |
| 2026-08-05 00:00 |
01:54:38.86 |
+16:56:59.0 |
HIP 8968 |
19.05 |
| 2026-08-05 12:00 |
01:54:36.39 |
+16:57:00.7 |
HIP 8968 |
19.43 |
| 2026-08-06 00:00 |
01:54:33.85 |
+16:57:02.0 |
HIP 8816 |
18.95 |
| 2026-08-06 12:00 |
01:54:31.24 |
+16:57:02.9 |
HIP 8816 |
18.36 |
| 2026-08-07 00:00 |
01:54:28.57 |
+16:57:03.5 |
HIP 8816 |
17.77 |
| 2026-08-07 12:00 |
01:54:25.84 |
+16:57:03.8 |
HIP 8816 |
17.17 |
| 2026-08-08 00:00 |
01:54:23.04 |
+16:57:03.7 |
HIP 8816 |
16.56 |
| 2026-08-08 12:00 |
01:54:20.18 |
+16:57:03.3 |
HIP 8816 |
15.94 |
| 2026-08-09 00:00 |
01:54:17.25 |
+16:57:02.5 |
HIP 8816 |
15.32 |
| 2026-08-09 12:00 |
01:54:14.26 |
+16:57:01.3 |
HIP 8816 |
14.70 |
| 2026-08-10 00:00 |
01:54:11.20 |
+16:56:59.8 |
HIP 8816 |
14.07 |
| 2026-08-10 12:00 |
01:54:08.08 |
+16:56:58.0 |
HIP 8816 |
13.45 |
| 2026-08-11 00:00 |
01:54:04.90 |
+16:56:55.7 |
HIP 8816 |
12.83 |
| 2026-08-11 12:00 |
01:54:01.65 |
+16:56:53.2 |
HIP 8816 |
12.21 |
| 2026-08-12 00:00 |
01:53:58.33 |
+16:56:50.2 |
HIP 8816 |
11.61 |
| 2026-08-12 12:00 |
01:53:54.96 |
+16:56:46.9 |
HIP 8816 |
11.02 |
| 2026-08-13 00:00 |
01:53:51.51 |
+16:56:43.3 |
HIP 8816 |
10.46 |
| 2026-08-13 12:00 |
01:53:48.01 |
+16:56:39.3 |
HIP 8816 |
9.92 |
| 2026-08-14 00:00 |
01:53:44.44 |
+16:56:34.9 |
HIP 8816 |
9.43 |
| 2026-08-14 12:00 |
01:53:40.80 |
+16:56:30.2 |
HIP 8816 |
8.98 |
| 2026-08-15 00:00 |
01:53:37.11 |
+16:56:25.1 |
HIP 8816 |
8.61 |
| 2026-08-15 12:00 |
01:53:33.35 |
+16:56:19.6 |
HIP 8816 |
8.30 |
| 2026-08-16 00:00 |
01:53:29.52 |
+16:56:13.8 |
HIP 8816 |
8.10 |
| 2026-08-16 12:00 |
01:53:25.63 |
+16:56:07.6 |
HIP 8816 |
7.99 |
| 2026-08-17 00:00 |
01:53:21.68 |
+16:56:01.1 |
HIP 8816 |
8.00 |
| 2026-08-17 12:00 |
01:53:17.67 |
+16:55:54.2 |
HIP 8816 |
8.13 |
| 2026-08-18 00:00 |
01:53:13.59 |
+16:55:46.9 |
HIP 8816 |
8.38 |
| 2026-08-18 12:00 |
01:53:09.45 |
+16:55:39.3 |
HIP 8816 |
8.74 |
| 2026-08-19 00:00 |
01:53:05.25 |
+16:55:31.3 |
HIP 8816 |
9.21 |