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) |
| 2026-06-01 00:00 |
10:12:51.69 |
-23:39:05.4 |
HIP 50142 |
20.20 |
| 2026-06-01 12:00 |
10:12:52.72 |
-23:38:35.5 |
HIP 50142 |
20.24 |
| 2026-06-02 00:00 |
10:12:53.79 |
-23:38:05.9 |
HIP 50142 |
20.28 |
| 2026-06-02 12:00 |
10:12:54.89 |
-23:37:36.5 |
HIP 50142 |
20.34 |
| 2026-06-03 00:00 |
10:12:56.02 |
-23:37:07.3 |
HIP 50142 |
20.40 |
| 2026-06-03 12:00 |
10:12:57.19 |
-23:36:38.3 |
HIP 50142 |
20.47 |
| 2026-06-04 00:00 |
10:12:58.39 |
-23:36:09.6 |
HIP 50142 |
20.54 |
| 2026-06-04 12:00 |
10:12:59.62 |
-23:35:41.0 |
HIP 50142 |
20.62 |
| 2026-06-05 00:00 |
10:13:00.88 |
-23:35:12.7 |
HIP 50142 |
20.70 |
| 2026-06-05 12:00 |
10:13:02.18 |
-23:34:44.6 |
HIP 50142 |
20.80 |
| 2026-06-06 00:00 |
10:13:03.51 |
-23:34:16.8 |
HIP 50142 |
20.89 |
| 2026-06-06 12:00 |
10:13:04.87 |
-23:33:49.1 |
HIP 50142 |
21.00 |
| 2026-06-07 00:00 |
10:13:06.27 |
-23:33:21.7 |
HIP 50142 |
21.11 |
| 2026-06-07 12:00 |
10:13:07.69 |
-23:32:54.6 |
HIP 50142 |
21.23 |
| 2026-06-08 00:00 |
10:13:09.15 |
-23:32:27.6 |
HIP 50142 |
21.35 |
| 2026-06-08 12:00 |
10:13:10.65 |
-23:32:00.9 |
HIP 50142 |
21.48 |
| 2026-06-09 00:00 |
10:13:12.17 |
-23:31:34.5 |
HIP 50142 |
21.62 |
| 2026-06-09 12:00 |
10:13:13.73 |
-23:31:08.2 |
HIP 50142 |
21.76 |
| 2026-06-10 00:00 |
10:13:15.32 |
-23:30:42.3 |
HIP 50142 |
21.90 |
| 2026-06-10 12:00 |
10:13:16.94 |
-23:30:16.5 |
HIP 50142 |
22.06 |
| 2026-06-11 00:00 |
10:13:18.59 |
-23:29:51.0 |
HIP 50142 |
22.22 |
| 2026-06-11 12:00 |
10:13:20.27 |
-23:29:25.8 |
HIP 50142 |
22.38 |
| 2026-06-12 00:00 |
10:13:21.99 |
-23:29:00.8 |
HIP 50142 |
22.56 |
| 2026-06-12 12:00 |
10:13:23.73 |
-23:28:36.1 |
HIP 50142 |
22.74 |
| 2026-06-13 00:00 |
10:13:25.51 |
-23:28:11.6 |
HIP 50142 |
22.92 |
| 2026-06-13 12:00 |
10:13:27.32 |
-23:27:47.3 |
HIP 50142 |
23.11 |
| 2026-06-14 00:00 |
10:13:29.16 |
-23:27:23.3 |
HIP 50115 |
23.18 |
| 2026-06-14 12:00 |
10:13:31.03 |
-23:26:59.6 |
HIP 50115 |
22.69 |
| 2026-06-15 00:00 |
10:13:32.93 |
-23:26:36.1 |
HIP 50115 |
22.22 |
| 2026-06-15 12:00 |
10:13:34.86 |
-23:26:12.9 |
HIP 50115 |
21.76 |
| 2026-06-16 00:00 |
10:13:36.83 |
-23:25:50.0 |
HIP 50115 |
21.30 |
| 2026-06-16 12:00 |
10:13:38.82 |
-23:25:27.3 |
HIP 50115 |
20.86 |
| 2026-06-17 00:00 |
10:13:40.84 |
-23:25:04.9 |
HIP 50115 |
20.42 |
| 2026-06-17 12:00 |
10:13:42.90 |
-23:24:42.7 |
HIP 50115 |
20.00 |
| 2026-06-18 00:00 |
10:13:44.98 |
-23:24:20.9 |
HIP 50115 |
19.59 |
| 2026-06-18 12:00 |
10:13:47.09 |
-23:23:59.2 |
HIP 50115 |
19.20 |
| 2026-06-19 00:00 |
10:13:49.23 |
-23:23:37.9 |
HIP 50115 |
18.82 |
| 2026-06-19 12:00 |
10:13:51.40 |
-23:23:16.8 |
HIP 50115 |
18.45 |
| 2026-06-20 00:00 |
10:13:53.61 |
-23:22:56.0 |
HIP 50115 |
18.11 |
| 2026-06-20 12:00 |
10:13:55.83 |
-23:22:35.5 |
HIP 50115 |
17.78 |
| 2026-06-21 00:00 |
10:13:58.09 |
-23:22:15.3 |
HIP 50115 |
17.48 |
| 2026-06-21 12:00 |
10:14:00.38 |
-23:21:55.3 |
HIP 50115 |
17.20 |
| 2026-06-22 00:00 |
10:14:02.69 |
-23:21:35.6 |
HIP 50115 |
16.94 |