257P/Catalina
メタデータ
| 項目 |
値 |
| Designation |
257P/Catalina |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2013-06-04T09:54:55.097280Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:13:33Z |
| Obs used |
2118 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
5.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2014-12-24.0000000 |
| e |
0.43237437 |
| q (au) |
2.130596 |
| a (au) |
3.753523 |
| i (deg) |
20.240315 |
| Ω (om, deg) |
207.850144 |
| ω (w, deg) |
117.883991 |
| M (ma, deg) |
76.926834 |
等級
散乱 + 全体線形
$$
M_a = (13.465 + 2.961\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.465 |
| n |
2.961 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
13:07:57.74 |
-15:06:36.6 |
HIP 63960 |
24.81 |
| 2026-02-03 12:00 |
13:07:58.26 |
-15:06:31.5 |
HIP 63960 |
24.88 |
| 2026-02-04 00:00 |
13:07:58.56 |
-15:06:24.9 |
HIP 63960 |
24.90 |
| 2026-02-04 12:00 |
13:07:58.64 |
-15:06:16.7 |
HIP 63960 |
24.85 |
| 2026-02-05 00:00 |
13:07:58.50 |
-15:06:06.9 |
HIP 63960 |
24.75 |
| 2026-02-05 12:00 |
13:07:58.13 |
-15:05:55.5 |
HIP 63960 |
24.58 |
| 2026-02-06 00:00 |
13:07:57.55 |
-15:05:42.5 |
HIP 63960 |
24.36 |
| 2026-02-06 12:00 |
13:07:56.74 |
-15:05:28.0 |
HIP 63960 |
24.08 |
| 2026-02-07 00:00 |
13:07:55.71 |
-15:05:11.7 |
HIP 63960 |
23.74 |
| 2026-02-07 12:00 |
13:07:54.45 |
-15:04:53.9 |
HIP 63960 |
23.34 |
| 2026-02-08 00:00 |
13:07:52.97 |
-15:04:34.4 |
HIP 63960 |
22.88 |
| 2026-02-08 12:00 |
13:07:51.27 |
-15:04:13.3 |
HIP 63960 |
22.35 |
| 2026-02-09 00:00 |
13:07:49.34 |
-15:03:50.5 |
HIP 63960 |
21.77 |
| 2026-02-09 12:00 |
13:07:47.19 |
-15:03:26.1 |
HIP 63960 |
21.13 |
| 2026-02-10 00:00 |
13:07:44.81 |
-15:03:00.0 |
HIP 63960 |
20.43 |
| 2026-02-10 12:00 |
13:07:42.20 |
-15:02:32.1 |
HIP 63960 |
19.67 |
| 2026-02-11 00:00 |
13:07:39.37 |
-15:02:02.7 |
HIP 63960 |
18.86 |
| 2026-02-11 12:00 |
13:07:36.31 |
-15:01:31.5 |
HIP 63960 |
17.98 |
| 2026-02-12 00:00 |
13:07:33.03 |
-15:00:58.6 |
HIP 63960 |
17.04 |
| 2026-02-12 12:00 |
13:07:29.52 |
-15:00:24.0 |
HIP 63960 |
16.05 |
| 2026-02-13 00:00 |
13:07:25.78 |
-14:59:47.7 |
HIP 63960 |
14.99 |
| 2026-02-13 12:00 |
13:07:21.82 |
-14:59:09.6 |
HIP 63960 |
13.89 |
| 2026-02-14 00:00 |
13:07:17.63 |
-14:58:29.8 |
HIP 63960 |
12.73 |
| 2026-02-14 12:00 |
13:07:13.22 |
-14:57:48.3 |
HIP 63960 |
11.52 |
| 2026-02-15 00:00 |
13:07:08.58 |
-14:57:05.1 |
HIP 63960 |
10.26 |
| 2026-02-15 12:00 |
13:07:03.71 |
-14:56:20.1 |
HIP 63960 |
8.97 |
| 2026-02-16 00:00 |
13:06:58.62 |
-14:55:33.3 |
HIP 63960 |
7.66 |
| 2026-02-16 12:00 |
13:06:53.30 |
-14:54:44.8 |
HIP 63960 |
6.36 |
| 2026-02-17 00:00 |
13:06:47.76 |
-14:53:54.5 |
HIP 63960 |
5.12 |
| 2026-02-17 12:00 |
13:06:42.00 |
-14:53:02.4 |
HIP 63960 |
4.10 |
| 2026-02-18 00:00 |
13:06:36.01 |
-14:52:08.5 |
HIP 63960 |
3.56 |
| 2026-02-18 12:00 |
13:06:29.79 |
-14:51:12.9 |
HIP 63960 |
3.81 |
| 2026-02-19 00:00 |
13:06:23.36 |
-14:50:15.5 |
HIP 63960 |
4.79 |
| 2026-02-19 12:00 |
13:06:16.70 |
-14:49:16.3 |
HIP 63960 |
6.21 |
| 2026-02-20 00:00 |
13:06:09.82 |
-14:48:15.3 |
HIP 63960 |
7.89 |
| 2026-02-20 12:00 |
13:06:02.72 |
-14:47:12.5 |
HIP 63960 |
9.73 |
| 2026-02-21 00:00 |
13:05:55.40 |
-14:46:07.9 |
HIP 63960 |
11.68 |
| 2026-02-21 12:00 |
13:05:47.87 |
-14:45:01.6 |
HIP 63960 |
13.72 |
| 2026-02-22 00:00 |
13:05:40.11 |
-14:43:53.4 |
HIP 63960 |
15.85 |
| 2026-02-22 12:00 |
13:05:32.14 |
-14:42:43.4 |
HIP 63960 |
18.05 |
| 2026-02-23 00:00 |
13:05:23.95 |
-14:41:31.6 |
HIP 63960 |
20.32 |
| 2026-02-23 12:00 |
13:05:15.55 |
-14:40:18.0 |
HIP 63960 |
22.66 |
| 2026-02-24 00:00 |
13:05:06.93 |
-14:39:02.7 |
HIP 63960 |
25.06 |