メタデータ
| 項目 |
値 |
| Designation |
227P/Catalina-LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-03-15T05:19:57.423360Z |
| Orbit solution date (soln_date, UTC) |
2025-01-10T09:12:26Z |
| Obs used |
1235 |
| NEO |
- |
| M1 |
12.100 |
| K1 |
18.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2021-03-27.0000000 |
| e |
0.51043355 |
| q (au) |
1.742453 |
| a (au) |
3.559175 |
| i (deg) |
6.512508 |
| Ω (om, deg) |
48.592710 |
| ω (w, deg) |
90.858601 |
| M (ma, deg) |
200.853061 |
等級
散乱 + 全体線形
$$
M_a = (11.892 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.892 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2023-10-09 |
2023-12-06 |
+3.9053 |
+0.883 |
| 2023-12-06 |
2024-03-15 |
+40.6801 |
-8.847 |
| 2024-03-15 |
2024-07-23 |
-1.7736 |
-0.021 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
20:47:23.18 |
-24:54:06.5 |
HIP 102516 |
11.69 |
| 2026-03-26 12:00 |
20:47:44.38 |
-24:53:22.0 |
HIP 102516 |
16.54 |
| 2026-03-27 00:00 |
20:48:05.46 |
-24:52:38.1 |
HIP 102516 |
21.37 |
| 2026-03-27 12:00 |
20:48:26.40 |
-24:51:54.8 |
HIP 102822 |
18.93 |
| 2026-03-28 00:00 |
20:48:47.20 |
-24:51:12.0 |
HIP 102822 |
14.16 |
| 2026-03-28 12:00 |
20:49:07.88 |
-24:50:29.8 |
HIP 102822 |
9.41 |
| 2026-03-29 00:00 |
20:49:28.42 |
-24:49:48.1 |
HIP 102822 |
4.70 |
| 2026-03-29 12:00 |
20:49:48.82 |
-24:49:07.1 |
HIP 102822 |
0.18 |
| 2026-03-30 00:00 |
20:50:09.09 |
-24:48:26.7 |
HIP 102822 |
4.63 |
| 2026-03-30 12:00 |
20:50:29.22 |
-24:47:46.8 |
HIP 102822 |
9.25 |
| 2026-03-31 00:00 |
20:50:49.22 |
-24:47:07.6 |
HIP 102869 |
12.59 |
| 2026-03-31 12:00 |
20:51:09.08 |
-24:46:28.9 |
HIP 102869 |
15.27 |
| 2026-04-01 00:00 |
20:51:28.80 |
-24:45:50.9 |
HIP 102869 |
18.67 |
| 2026-04-01 12:00 |
20:51:48.38 |
-24:45:13.5 |
HIP 102869 |
22.43 |
| 2026-04-02 00:00 |
20:52:07.82 |
-24:44:36.7 |
HIP 102869 |
26.38 |
| 2026-04-02 12:00 |
20:52:27.11 |
-24:44:00.6 |
HIP 102869 |
30.44 |
| 2026-04-03 00:00 |
20:52:46.27 |
-24:43:25.0 |
HIP 103065 |
30.59 |
| 2026-04-03 12:00 |
20:53:05.29 |
-24:42:50.1 |
HIP 103158 |
28.94 |
| 2026-04-04 00:00 |
20:53:24.16 |
-24:42:15.9 |
HIP 103158 |
26.79 |
| 2026-04-04 12:00 |
20:53:42.89 |
-24:41:42.3 |
HIP 103158 |
25.22 |
| 2026-04-05 00:00 |
20:54:01.47 |
-24:41:09.4 |
HIP 103158 |
24.33 |
| 2026-04-05 12:00 |
20:54:19.90 |
-24:40:37.1 |
HIP 103158 |
24.17 |
| 2026-04-06 00:00 |
20:54:38.19 |
-24:40:05.6 |
HIP 103158 |
24.75 |
| 2026-04-06 12:00 |
20:54:56.34 |
-24:39:34.6 |
HIP 103158 |
25.99 |
| 2026-04-07 00:00 |
20:55:14.33 |
-24:39:04.4 |
HIP 103158 |
27.80 |
| 2026-04-07 12:00 |
20:55:32.18 |
-24:38:34.9 |
HIP 103158 |
30.05 |
| 2026-04-08 00:00 |
20:55:49.87 |
-24:38:06.0 |
HIP 103456 |
26.50 |
| 2026-04-08 12:00 |
20:56:07.41 |
-24:37:37.9 |
HIP 103456 |
22.60 |
| 2026-04-09 00:00 |
20:56:24.81 |
-24:37:10.4 |
HIP 103456 |
18.78 |
| 2026-04-09 12:00 |
20:56:42.05 |
-24:36:43.7 |
HIP 103456 |
15.08 |
| 2026-04-10 00:00 |
20:56:59.13 |
-24:36:17.6 |
HIP 103456 |
11.58 |
| 2026-04-10 12:00 |
20:57:16.06 |
-24:35:52.3 |
HIP 103456 |
8.48 |
| 2026-04-11 00:00 |
20:57:32.84 |
-24:35:27.8 |
HIP 103456 |
6.32 |
| 2026-04-11 12:00 |
20:57:49.45 |
-24:35:03.9 |
HIP 103456 |
6.12 |
| 2026-04-12 00:00 |
20:58:05.91 |
-24:34:40.9 |
HIP 103456 |
7.97 |
| 2026-04-12 12:00 |
20:58:22.22 |
-24:34:18.5 |
HIP 103456 |
10.83 |
| 2026-04-13 00:00 |
20:58:38.36 |
-24:33:56.9 |
HIP 103456 |
14.07 |
| 2026-04-13 12:00 |
20:58:54.34 |
-24:33:36.1 |
HIP 103456 |
17.46 |
| 2026-04-14 00:00 |
20:59:10.16 |
-24:33:16.0 |
HIP 103456 |
20.90 |
| 2026-04-14 12:00 |
20:59:25.82 |
-24:32:56.7 |
HIP 103456 |
24.36 |
| 2026-04-15 00:00 |
20:59:41.31 |
-24:32:38.2 |
HIP 103456 |
27.81 |
| 2026-04-15 12:00 |
20:59:56.64 |
-24:32:20.5 |
HIP 103456 |
31.25 |
| 2026-04-16 00:00 |
21:00:11.81 |
-24:32:03.5 |
HIP 103456 |
34.66 |