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) |
| 2026-07-29 00:00 |
10:18:00.09 |
-23:10:52.2 |
HIP 50504 |
11.53 |
| 2026-07-29 12:00 |
10:18:04.00 |
-23:10:54.9 |
HIP 50504 |
10.63 |
| 2026-07-30 00:00 |
10:18:07.92 |
-23:10:57.9 |
HIP 50504 |
9.73 |
| 2026-07-30 12:00 |
10:18:11.86 |
-23:11:01.2 |
HIP 50504 |
8.82 |
| 2026-07-31 00:00 |
10:18:15.81 |
-23:11:04.7 |
HIP 50504 |
7.92 |
| 2026-07-31 12:00 |
10:18:19.77 |
-23:11:08.6 |
HIP 50504 |
7.01 |
| 2026-08-01 00:00 |
10:18:23.74 |
-23:11:12.8 |
HIP 50504 |
6.10 |
| 2026-08-01 12:00 |
10:18:27.73 |
-23:11:17.3 |
HIP 50504 |
5.19 |
| 2026-08-02 00:00 |
10:18:31.72 |
-23:11:22.1 |
HIP 50504 |
4.29 |
| 2026-08-02 12:00 |
10:18:35.73 |
-23:11:27.2 |
HIP 50504 |
3.39 |
| 2026-08-03 00:00 |
10:18:39.75 |
-23:11:32.6 |
HIP 50504 |
2.50 |
| 2026-08-03 12:00 |
10:18:43.78 |
-23:11:38.3 |
HIP 50504 |
1.67 |
| 2026-08-04 00:00 |
10:18:47.83 |
-23:11:44.3 |
HIP 50504 |
1.02 |
| 2026-08-04 12:00 |
10:18:51.88 |
-23:11:50.5 |
HIP 50504 |
1.03 |
| 2026-08-05 00:00 |
10:18:55.94 |
-23:11:57.1 |
HIP 50504 |
1.69 |
| 2026-08-05 12:00 |
10:19:00.02 |
-23:12:04.0 |
HIP 50504 |
2.54 |
| 2026-08-06 00:00 |
10:19:04.10 |
-23:12:11.2 |
HIP 50504 |
3.44 |
| 2026-08-06 12:00 |
10:19:08.19 |
-23:12:18.7 |
HIP 50504 |
4.36 |
| 2026-08-07 00:00 |
10:19:12.30 |
-23:12:26.5 |
HIP 50504 |
5.30 |
| 2026-08-07 12:00 |
10:19:16.41 |
-23:12:34.5 |
HIP 50504 |
6.24 |
| 2026-08-08 00:00 |
10:19:20.53 |
-23:12:42.9 |
HIP 50504 |
7.19 |
| 2026-08-08 12:00 |
10:19:24.66 |
-23:12:51.6 |
HIP 50504 |
8.15 |
| 2026-08-09 00:00 |
10:19:28.80 |
-23:13:00.5 |
HIP 50504 |
9.11 |
| 2026-08-09 12:00 |
10:19:32.95 |
-23:13:09.8 |
HIP 50504 |
10.07 |
| 2026-08-10 00:00 |
10:19:37.11 |
-23:13:19.4 |
HIP 50601 |
10.96 |
| 2026-08-10 12:00 |
10:19:41.27 |
-23:13:29.2 |
HIP 50601 |
10.37 |
| 2026-08-11 00:00 |
10:19:45.44 |
-23:13:39.4 |
HIP 50601 |
9.84 |
| 2026-08-11 12:00 |
10:19:49.62 |
-23:13:49.8 |
HIP 50601 |
9.39 |
| 2026-08-12 00:00 |
10:19:53.81 |
-23:14:00.5 |
HIP 50601 |
9.03 |
| 2026-08-12 12:00 |
10:19:58.00 |
-23:14:11.6 |
HIP 50601 |
8.76 |
| 2026-08-13 00:00 |
10:20:02.20 |
-23:14:22.9 |
HIP 50601 |
8.60 |
| 2026-08-13 12:00 |
10:20:06.41 |
-23:14:34.5 |
HIP 50601 |
8.56 |
| 2026-08-14 00:00 |
10:20:10.62 |
-23:14:46.4 |
HIP 50601 |
8.64 |
| 2026-08-14 12:00 |
10:20:14.84 |
-23:14:58.6 |
HIP 50601 |
8.83 |
| 2026-08-15 00:00 |
10:20:19.06 |
-23:15:11.0 |
HIP 50601 |
9.13 |
| 2026-08-15 12:00 |
10:20:23.29 |
-23:15:23.8 |
HIP 50601 |
9.53 |
| 2026-08-16 00:00 |
10:20:27.52 |
-23:15:36.8 |
HIP 50601 |
10.01 |
| 2026-08-16 12:00 |
10:20:31.76 |
-23:15:50.2 |
HIP 50601 |
10.58 |
| 2026-08-17 00:00 |
10:20:36.00 |
-23:16:03.8 |
HIP 50601 |
11.21 |
| 2026-08-17 12:00 |
10:20:40.25 |
-23:16:17.7 |
HIP 50601 |
11.89 |
| 2026-08-18 00:00 |
10:20:44.50 |
-23:16:31.9 |
HIP 50601 |
12.63 |
| 2026-08-18 12:00 |
10:20:48.76 |
-23:16:46.3 |
HIP 50601 |
13.40 |
| 2026-08-19 00:00 |
10:20:53.02 |
-23:17:01.0 |
HIP 50601 |
14.20 |