メタデータ
| 項目 |
値 |
| Designation |
C/2013 B2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-07-01T12:27:38.249280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:30Z |
| Obs used |
136 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
5.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-05-16.0000000 |
| e |
1.00270297 |
| q (au) |
3.734135 |
| a (au) |
-1381.494777 |
| i (deg) |
43.454890 |
| Ω (om, deg) |
331.958789 |
| ω (w, deg) |
156.433585 |
| M (ma, deg) |
-0.000893 |
等級
散乱 + 全体線形
$$
M_a = (6.637 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.637 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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 |
18:09:52.61 |
-63:40:33.7 |
HIP 88866 |
8.64 |
| 2026-07-29 12:00 |
18:09:45.56 |
-63:40:08.7 |
HIP 88866 |
7.85 |
| 2026-07-30 00:00 |
18:09:38.56 |
-63:39:43.4 |
HIP 88866 |
7.08 |
| 2026-07-30 12:00 |
18:09:31.62 |
-63:39:17.8 |
HIP 88866 |
6.35 |
| 2026-07-31 00:00 |
18:09:24.73 |
-63:38:51.9 |
HIP 88866 |
5.67 |
| 2026-07-31 12:00 |
18:09:17.89 |
-63:38:25.7 |
HIP 88866 |
5.06 |
| 2026-08-01 00:00 |
18:09:11.11 |
-63:37:59.2 |
HIP 88866 |
4.54 |
| 2026-08-01 12:00 |
18:09:04.38 |
-63:37:32.4 |
HIP 88866 |
4.15 |
| 2026-08-02 00:00 |
18:08:57.71 |
-63:37:05.3 |
HIP 88866 |
3.93 |
| 2026-08-02 12:00 |
18:08:51.09 |
-63:36:37.9 |
HIP 88866 |
3.90 |
| 2026-08-03 00:00 |
18:08:44.52 |
-63:36:10.3 |
HIP 88866 |
4.06 |
| 2026-08-03 12:00 |
18:08:38.02 |
-63:35:42.3 |
HIP 88866 |
4.39 |
| 2026-08-04 00:00 |
18:08:31.57 |
-63:35:14.1 |
HIP 88866 |
4.86 |
| 2026-08-04 12:00 |
18:08:25.18 |
-63:34:45.6 |
HIP 88866 |
5.43 |
| 2026-08-05 00:00 |
18:08:18.84 |
-63:34:16.8 |
HIP 88866 |
6.07 |
| 2026-08-05 12:00 |
18:08:12.57 |
-63:33:47.8 |
HIP 88866 |
6.75 |
| 2026-08-06 00:00 |
18:08:06.35 |
-63:33:18.5 |
HIP 88866 |
7.48 |
| 2026-08-06 12:00 |
18:08:00.19 |
-63:32:48.9 |
HIP 88866 |
8.22 |
| 2026-08-07 00:00 |
18:07:54.10 |
-63:32:19.0 |
HIP 88866 |
8.99 |
| 2026-08-07 12:00 |
18:07:48.06 |
-63:31:48.9 |
HIP 88866 |
9.76 |
| 2026-08-08 00:00 |
18:07:42.09 |
-63:31:18.5 |
HIP 88866 |
10.55 |
| 2026-08-08 12:00 |
18:07:36.17 |
-63:30:47.8 |
HIP 88866 |
11.34 |
| 2026-08-09 00:00 |
18:07:30.32 |
-63:30:16.9 |
HIP 88866 |
12.14 |
| 2026-08-09 12:00 |
18:07:24.54 |
-63:29:45.8 |
HIP 88866 |
12.94 |
| 2026-08-10 00:00 |
18:07:18.81 |
-63:29:14.3 |
HIP 88866 |
13.75 |
| 2026-08-10 12:00 |
18:07:13.15 |
-63:28:42.7 |
HIP 88866 |
14.55 |
| 2026-08-11 00:00 |
18:07:07.56 |
-63:28:10.8 |
HIP 88866 |
15.36 |
| 2026-08-11 12:00 |
18:07:02.02 |
-63:27:38.6 |
HIP 88866 |
16.17 |
| 2026-08-12 00:00 |
18:06:56.56 |
-63:27:06.2 |
HIP 88866 |
16.97 |
| 2026-08-12 12:00 |
18:06:51.16 |
-63:26:33.6 |
HIP 88607 |
17.44 |
| 2026-08-13 00:00 |
18:06:45.83 |
-63:26:00.7 |
HIP 88607 |
16.66 |
| 2026-08-13 12:00 |
18:06:40.56 |
-63:25:27.7 |
HIP 88607 |
15.89 |
| 2026-08-14 00:00 |
18:06:35.36 |
-63:24:54.3 |
HIP 88607 |
15.12 |
| 2026-08-14 12:00 |
18:06:30.23 |
-63:24:20.8 |
HIP 88607 |
14.36 |
| 2026-08-15 00:00 |
18:06:25.17 |
-63:23:47.0 |
HIP 88607 |
13.60 |
| 2026-08-15 12:00 |
18:06:20.17 |
-63:23:13.0 |
HIP 88607 |
12.84 |
| 2026-08-16 00:00 |
18:06:15.24 |
-63:22:38.8 |
HIP 88607 |
12.09 |
| 2026-08-16 12:00 |
18:06:10.39 |
-63:22:04.4 |
HIP 88607 |
11.35 |
| 2026-08-17 00:00 |
18:06:05.60 |
-63:21:29.8 |
HIP 88607 |
10.61 |
| 2026-08-17 12:00 |
18:06:00.88 |
-63:20:54.9 |
HIP 88607 |
9.88 |
| 2026-08-18 00:00 |
18:05:56.23 |
-63:20:19.9 |
HIP 88607 |
9.15 |
| 2026-08-18 12:00 |
18:05:51.65 |
-63:19:44.7 |
HIP 88607 |
8.44 |
| 2026-08-19 00:00 |
18:05:47.15 |
-63:19:09.2 |
HIP 88607 |
7.74 |