C/2012 J1 (Catalina)
メタデータ
| 項目 |
値 |
| Designation |
C/2012 J1 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-12-07T05:37:22.232640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:08Z |
| Obs used |
4401 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
12.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-11-16.0000000 |
| e |
1.00132777 |
| q (au) |
3.158711 |
| a (au) |
-2378.965648 |
| i (deg) |
34.186089 |
| Ω (om, deg) |
235.217062 |
| ω (w, deg) |
147.272733 |
| M (ma, deg) |
-0.000180 |
等級
散乱 + 全体線形
$$
M_a = (5.312 + 4.942\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.312 |
| n |
4.942 |
| gf |
1.000 |
| gb |
-0.923 |
| k |
1.000 |
| 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) |
| 2026-02-03 00:00 |
10:22:12.21 |
-25:35:59.2 |
HIP 50719 |
17.77 |
| 2026-02-03 12:00 |
10:22:08.42 |
-25:35:55.2 |
HIP 50719 |
17.18 |
| 2026-02-04 00:00 |
10:22:04.62 |
-25:35:50.9 |
HIP 50719 |
16.61 |
| 2026-02-04 12:00 |
10:22:00.81 |
-25:35:46.2 |
HIP 50719 |
16.06 |
| 2026-02-05 00:00 |
10:21:56.99 |
-25:35:41.1 |
HIP 50719 |
15.52 |
| 2026-02-05 12:00 |
10:21:53.15 |
-25:35:35.6 |
HIP 50719 |
15.02 |
| 2026-02-06 00:00 |
10:21:49.30 |
-25:35:29.8 |
HIP 50719 |
14.54 |
| 2026-02-06 12:00 |
10:21:45.44 |
-25:35:23.6 |
HIP 50719 |
14.09 |
| 2026-02-07 00:00 |
10:21:41.57 |
-25:35:17.0 |
HIP 50719 |
13.67 |
| 2026-02-07 12:00 |
10:21:37.69 |
-25:35:10.1 |
HIP 50719 |
13.30 |
| 2026-02-08 00:00 |
10:21:33.79 |
-25:35:02.8 |
HIP 50719 |
12.96 |
| 2026-02-08 12:00 |
10:21:29.89 |
-25:34:55.1 |
HIP 50719 |
12.68 |
| 2026-02-09 00:00 |
10:21:25.98 |
-25:34:47.1 |
HIP 50719 |
12.44 |
| 2026-02-09 12:00 |
10:21:22.05 |
-25:34:38.6 |
HIP 50719 |
12.26 |
| 2026-02-10 00:00 |
10:21:18.12 |
-25:34:29.9 |
HIP 50719 |
12.14 |
| 2026-02-10 12:00 |
10:21:14.18 |
-25:34:20.7 |
HIP 50719 |
12.08 |
| 2026-02-11 00:00 |
10:21:10.23 |
-25:34:11.2 |
HIP 50719 |
12.08 |
| 2026-02-11 12:00 |
10:21:06.27 |
-25:34:01.4 |
HIP 50719 |
12.14 |
| 2026-02-12 00:00 |
10:21:02.31 |
-25:33:51.1 |
HIP 50719 |
12.27 |
| 2026-02-12 12:00 |
10:20:58.34 |
-25:33:40.5 |
HIP 50719 |
12.45 |
| 2026-02-13 00:00 |
10:20:54.36 |
-25:33:29.6 |
HIP 50719 |
12.70 |
| 2026-02-13 12:00 |
10:20:50.37 |
-25:33:18.3 |
HIP 50719 |
12.99 |
| 2026-02-14 00:00 |
10:20:46.38 |
-25:33:06.6 |
HIP 50719 |
13.35 |
| 2026-02-14 12:00 |
10:20:42.38 |
-25:32:54.6 |
HIP 50719 |
13.75 |
| 2026-02-15 00:00 |
10:20:38.38 |
-25:32:42.2 |
HIP 50719 |
14.20 |
| 2026-02-15 12:00 |
10:20:34.37 |
-25:32:29.4 |
HIP 50719 |
14.68 |
| 2026-02-16 00:00 |
10:20:30.36 |
-25:32:16.3 |
HIP 50719 |
15.21 |
| 2026-02-16 12:00 |
10:20:26.34 |
-25:32:02.9 |
HIP 50719 |
15.77 |
| 2026-02-17 00:00 |
10:20:22.32 |
-25:31:49.0 |
HIP 50719 |
16.36 |
| 2026-02-17 12:00 |
10:20:18.30 |
-25:31:34.9 |
HIP 50719 |
16.99 |
| 2026-02-18 00:00 |
10:20:14.27 |
-25:31:20.4 |
HIP 50719 |
17.63 |
| 2026-02-18 12:00 |
10:20:10.24 |
-25:31:05.5 |
HIP 50541 |
17.29 |
| 2026-02-19 00:00 |
10:20:06.21 |
-25:30:50.3 |
HIP 50541 |
16.55 |
| 2026-02-19 12:00 |
10:20:02.18 |
-25:30:34.7 |
HIP 50541 |
15.83 |
| 2026-02-20 00:00 |
10:19:58.14 |
-25:30:18.8 |
HIP 50541 |
15.13 |
| 2026-02-20 12:00 |
10:19:54.10 |
-25:30:02.6 |
HIP 50541 |
14.45 |
| 2026-02-21 00:00 |
10:19:50.07 |
-25:29:46.0 |
HIP 50541 |
13.80 |
| 2026-02-21 12:00 |
10:19:46.03 |
-25:29:29.1 |
HIP 50541 |
13.18 |
| 2026-02-22 00:00 |
10:19:42.00 |
-25:29:11.8 |
HIP 50541 |
12.59 |
| 2026-02-22 12:00 |
10:19:37.96 |
-25:28:54.2 |
HIP 50541 |
12.05 |
| 2026-02-23 00:00 |
10:19:33.92 |
-25:28:36.3 |
HIP 50541 |
11.56 |
| 2026-02-23 12:00 |
10:19:29.89 |
-25:28:18.1 |
HIP 50541 |
11.12 |
| 2026-02-24 00:00 |
10:19:25.86 |
-25:27:59.5 |
HIP 50541 |
10.74 |