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) |
| 2026-09-20 00:00 |
20:12:38.97 |
-28:40:33.1 |
HIP 99489 |
15.88 |
| 2026-09-20 12:00 |
20:12:32.41 |
-28:40:03.5 |
HIP 99489 |
14.49 |
| 2026-09-21 00:00 |
20:12:26.08 |
-28:39:33.1 |
HIP 99489 |
13.19 |
| 2026-09-21 12:00 |
20:12:19.98 |
-28:39:01.9 |
HIP 99489 |
11.97 |
| 2026-09-22 00:00 |
20:12:14.11 |
-28:38:30.0 |
HIP 99489 |
10.86 |
| 2026-09-22 12:00 |
20:12:08.47 |
-28:37:57.3 |
HIP 99489 |
9.88 |
| 2026-09-23 00:00 |
20:12:03.06 |
-28:37:23.8 |
HIP 99489 |
9.04 |
| 2026-09-23 12:00 |
20:11:57.88 |
-28:36:49.5 |
HIP 99478 |
8.16 |
| 2026-09-24 00:00 |
20:11:52.92 |
-28:36:14.5 |
HIP 99478 |
7.18 |
| 2026-09-24 12:00 |
20:11:48.20 |
-28:35:38.8 |
HIP 99478 |
6.35 |
| 2026-09-25 00:00 |
20:11:43.70 |
-28:35:02.3 |
HIP 99478 |
5.70 |
| 2026-09-25 12:00 |
20:11:39.43 |
-28:34:25.1 |
HIP 99478 |
5.27 |
| 2026-09-26 00:00 |
20:11:35.39 |
-28:33:47.1 |
HIP 99478 |
5.10 |
| 2026-09-26 12:00 |
20:11:31.58 |
-28:33:08.4 |
HIP 99478 |
5.19 |
| 2026-09-27 00:00 |
20:11:28.00 |
-28:32:29.1 |
HIP 99478 |
5.51 |
| 2026-09-27 12:00 |
20:11:24.64 |
-28:31:49.0 |
HIP 99478 |
6.01 |
| 2026-09-28 00:00 |
20:11:21.51 |
-28:31:08.2 |
HIP 99478 |
6.64 |
| 2026-09-28 12:00 |
20:11:18.61 |
-28:30:26.7 |
HIP 99478 |
7.34 |
| 2026-09-29 00:00 |
20:11:15.94 |
-28:29:44.5 |
HIP 99478 |
8.10 |
| 2026-09-29 12:00 |
20:11:13.49 |
-28:29:01.6 |
HIP 99478 |
8.90 |
| 2026-09-30 00:00 |
20:11:11.27 |
-28:28:18.1 |
HIP 99478 |
9.71 |
| 2026-09-30 12:00 |
20:11:09.27 |
-28:27:33.9 |
HIP 99478 |
10.52 |
| 2026-10-01 00:00 |
20:11:07.50 |
-28:26:49.0 |
HIP 99478 |
11.35 |
| 2026-10-01 12:00 |
20:11:05.96 |
-28:26:03.5 |
HIP 99478 |
12.17 |
| 2026-10-02 00:00 |
20:11:04.64 |
-28:25:17.3 |
HIP 99478 |
12.99 |
| 2026-10-02 12:00 |
20:11:03.55 |
-28:24:30.4 |
HIP 99478 |
13.80 |
| 2026-10-03 00:00 |
20:11:02.68 |
-28:23:42.9 |
HIP 99478 |
14.62 |
| 2026-10-03 12:00 |
20:11:02.04 |
-28:22:54.8 |
HIP 99478 |
15.43 |
| 2026-10-04 00:00 |
20:11:01.62 |
-28:22:06.0 |
HIP 99478 |
16.24 |
| 2026-10-04 12:00 |
20:11:01.43 |
-28:21:16.6 |
HIP 99478 |
17.04 |
| 2026-10-05 00:00 |
20:11:01.45 |
-28:20:26.6 |
HIP 99478 |
17.85 |
| 2026-10-05 12:00 |
20:11:01.71 |
-28:19:35.9 |
HIP 99478 |
18.66 |
| 2026-10-06 00:00 |
20:11:02.18 |
-28:18:44.7 |
HIP 99478 |
19.47 |
| 2026-10-06 12:00 |
20:11:02.88 |
-28:17:52.8 |
HIP 99478 |
20.28 |
| 2026-10-07 00:00 |
20:11:03.80 |
-28:17:00.3 |
HIP 99478 |
21.11 |
| 2026-10-07 12:00 |
20:11:04.94 |
-28:16:07.2 |
HIP 99478 |
21.94 |
| 2026-10-08 00:00 |
20:11:06.31 |
-28:15:13.5 |
HIP 99478 |
22.77 |
| 2026-10-08 12:00 |
20:11:07.89 |
-28:14:19.3 |
HIP 99478 |
23.63 |
| 2026-10-09 00:00 |
20:11:09.69 |
-28:13:24.4 |
HIP 99478 |
24.49 |
| 2026-10-09 12:00 |
20:11:11.72 |
-28:12:28.9 |
HIP 99478 |
25.37 |
| 2026-10-10 00:00 |
20:11:13.96 |
-28:11:32.9 |
HIP 99478 |
26.27 |
| 2026-10-10 12:00 |
20:11:16.42 |
-28:10:36.3 |
HIP 99478 |
27.18 |
| 2026-10-11 00:00 |
20:11:19.10 |
-28:09:39.1 |
HIP 99478 |
28.12 |