メタデータ
| 項目 |
値 |
| Designation |
C/2009 K2 (Catalina) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-02-07T11:38:37.547520Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:31Z |
| Obs used |
665 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
7.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-08-14.0000000 |
| e |
0.99777882 |
| q (au) |
3.246176 |
| a (au) |
1461.466569 |
| i (deg) |
66.821915 |
| Ω (om, deg) |
123.805511 |
| ω (w, deg) |
147.693496 |
| M (ma, deg) |
359.996869 |
等級
散乱 + 全体線形
$$
M_a = (8.341 + 4.485\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.341 |
| n |
4.485 |
| gf |
1.000 |
| gb |
-0.595 |
| 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) |
| 2026-05-12 00:00 |
05:26:39.66 |
-34:27:31.1 |
HIP 25504 |
11.80 |
| 2026-05-12 12:00 |
05:26:43.50 |
-34:27:03.6 |
HIP 25504 |
11.71 |
| 2026-05-13 00:00 |
05:26:47.36 |
-34:26:36.4 |
HIP 25504 |
11.69 |
| 2026-05-13 12:00 |
05:26:51.24 |
-34:26:09.6 |
HIP 25504 |
11.74 |
| 2026-05-14 00:00 |
05:26:55.13 |
-34:25:43.1 |
HIP 25504 |
11.84 |
| 2026-05-14 12:00 |
05:26:59.04 |
-34:25:16.9 |
HIP 25504 |
12.02 |
| 2026-05-15 00:00 |
05:27:02.97 |
-34:24:51.0 |
HIP 25504 |
12.25 |
| 2026-05-15 12:00 |
05:27:06.91 |
-34:24:25.5 |
HIP 25504 |
12.54 |
| 2026-05-16 00:00 |
05:27:10.87 |
-34:24:00.2 |
HIP 25504 |
12.88 |
| 2026-05-16 12:00 |
05:27:14.84 |
-34:23:35.3 |
HIP 25504 |
13.27 |
| 2026-05-17 00:00 |
05:27:18.83 |
-34:23:10.8 |
HIP 25504 |
13.71 |
| 2026-05-17 12:00 |
05:27:22.83 |
-34:22:46.5 |
HIP 25504 |
14.19 |
| 2026-05-18 00:00 |
05:27:26.84 |
-34:22:22.6 |
HIP 25504 |
14.70 |
| 2026-05-18 12:00 |
05:27:30.88 |
-34:21:59.0 |
HIP 25504 |
15.25 |
| 2026-05-19 00:00 |
05:27:34.92 |
-34:21:35.8 |
HIP 25504 |
15.83 |
| 2026-05-19 12:00 |
05:27:38.98 |
-34:21:12.9 |
HIP 25504 |
16.43 |
| 2026-05-20 00:00 |
05:27:43.05 |
-34:20:50.3 |
HIP 25504 |
17.06 |
| 2026-05-20 12:00 |
05:27:47.13 |
-34:20:28.1 |
HIP 25504 |
17.71 |
| 2026-05-21 00:00 |
05:27:51.23 |
-34:20:06.2 |
HIP 25504 |
18.38 |
| 2026-05-21 12:00 |
05:27:55.34 |
-34:19:44.6 |
HIP 25504 |
19.06 |
| 2026-05-22 00:00 |
05:27:59.46 |
-34:19:23.4 |
HIP 25504 |
19.76 |
| 2026-05-22 12:00 |
05:28:03.60 |
-34:19:02.5 |
HIP 25709 |
20.42 |
| 2026-05-23 00:00 |
05:28:07.74 |
-34:18:41.9 |
HIP 25709 |
19.94 |
| 2026-05-23 12:00 |
05:28:11.90 |
-34:18:21.7 |
HIP 25709 |
19.48 |
| 2026-05-24 00:00 |
05:28:16.06 |
-34:18:01.8 |
HIP 25709 |
19.06 |
| 2026-05-24 12:00 |
05:28:20.24 |
-34:17:42.3 |
HIP 25709 |
18.66 |
| 2026-05-25 00:00 |
05:28:24.43 |
-34:17:23.1 |
HIP 25709 |
18.30 |
| 2026-05-25 12:00 |
05:28:28.63 |
-34:17:04.3 |
HIP 25709 |
17.97 |
| 2026-05-26 00:00 |
05:28:32.84 |
-34:16:45.8 |
HIP 25709 |
17.67 |
| 2026-05-26 12:00 |
05:28:37.06 |
-34:16:27.7 |
HIP 25709 |
17.42 |
| 2026-05-27 00:00 |
05:28:41.29 |
-34:16:09.9 |
HIP 25709 |
17.20 |
| 2026-05-27 12:00 |
05:28:45.53 |
-34:15:52.4 |
HIP 25709 |
17.03 |
| 2026-05-28 00:00 |
05:28:49.77 |
-34:15:35.3 |
HIP 25709 |
16.89 |
| 2026-05-28 12:00 |
05:28:54.03 |
-34:15:18.5 |
HIP 25709 |
16.80 |
| 2026-05-29 00:00 |
05:28:58.29 |
-34:15:02.1 |
HIP 25709 |
16.76 |
| 2026-05-29 12:00 |
05:29:02.56 |
-34:14:46.0 |
HIP 25709 |
16.76 |
| 2026-05-30 00:00 |
05:29:06.84 |
-34:14:30.3 |
HIP 25709 |
16.80 |
| 2026-05-30 12:00 |
05:29:11.13 |
-34:14:14.9 |
HIP 25709 |
16.89 |
| 2026-05-31 00:00 |
05:29:15.43 |
-34:14:00.0 |
HIP 25709 |
17.02 |
| 2026-05-31 12:00 |
05:29:19.73 |
-34:13:45.2 |
HIP 25709 |
17.20 |
| 2026-06-01 00:00 |
05:29:24.04 |
-34:13:30.9 |
HIP 25709 |
17.41 |
| 2026-06-01 12:00 |
05:29:28.36 |
-34:13:16.9 |
HIP 25709 |
17.67 |
| 2026-06-02 00:00 |
05:29:32.68 |
-34:13:03.3 |
HIP 25709 |
17.96 |