P/2009 T2 (La Sagra)
メタデータ
| 項目 |
値 |
| Designation |
P/2009 T2 (La Sagra) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-01-12T20:11:46.766400Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:35Z |
| Obs used |
882 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
10.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-11-18.0000000 |
| e |
0.76899059 |
| q (au) |
1.754750 |
| a (au) |
7.596009 |
| i (deg) |
28.106386 |
| Ω (om, deg) |
215.985632 |
| ω (w, deg) |
215.470914 |
| M (ma, deg) |
357.371046 |
等級
散乱 + 全体線形
$$
M_a = (12.467 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.467 |
| n |
6.000 |
| gf |
0.800 |
| gb |
-0.867 |
| k |
0.998 |
| δ90 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
18:13:48.34 |
-01:46:57.0 |
HIP 89295 |
8.91 |
| 2026-02-03 12:00 |
18:13:57.68 |
-01:46:12.2 |
HIP 89295 |
10.83 |
| 2026-02-04 00:00 |
18:14:06.97 |
-01:45:26.9 |
HIP 89295 |
12.92 |
| 2026-02-04 12:00 |
18:14:16.21 |
-01:44:41.3 |
HIP 89295 |
15.11 |
| 2026-02-05 00:00 |
18:14:25.41 |
-01:43:55.3 |
HIP 89295 |
17.35 |
| 2026-02-05 12:00 |
18:14:34.56 |
-01:43:08.9 |
HIP 89295 |
19.62 |
| 2026-02-06 00:00 |
18:14:43.65 |
-01:42:22.1 |
HIP 89295 |
21.91 |
| 2026-02-06 12:00 |
18:14:52.70 |
-01:41:34.9 |
HIP 89295 |
24.20 |
| 2026-02-07 00:00 |
18:15:01.70 |
-01:40:47.3 |
HIP 89295 |
26.51 |
| 2026-02-07 12:00 |
18:15:10.64 |
-01:39:59.3 |
HIP 89295 |
28.81 |
| 2026-02-08 00:00 |
18:15:19.53 |
-01:39:10.9 |
HIP 89295 |
31.11 |
| 2026-02-08 12:00 |
18:15:28.37 |
-01:38:22.2 |
HIP 89295 |
33.41 |
| 2026-02-09 00:00 |
18:15:37.16 |
-01:37:33.0 |
HIP 89649 |
32.87 |
| 2026-02-09 12:00 |
18:15:45.89 |
-01:36:43.5 |
HIP 89649 |
30.54 |
| 2026-02-10 00:00 |
18:15:54.57 |
-01:35:53.6 |
HIP 89649 |
28.22 |
| 2026-02-10 12:00 |
18:16:03.20 |
-01:35:03.3 |
HIP 89649 |
25.92 |
| 2026-02-11 00:00 |
18:16:11.77 |
-01:34:12.7 |
HIP 89649 |
23.63 |
| 2026-02-11 12:00 |
18:16:20.28 |
-01:33:21.7 |
HIP 89649 |
21.35 |
| 2026-02-12 00:00 |
18:16:28.74 |
-01:32:30.3 |
HIP 89649 |
19.09 |
| 2026-02-12 12:00 |
18:16:37.14 |
-01:31:38.6 |
HIP 89649 |
16.85 |
| 2026-02-13 00:00 |
18:16:45.48 |
-01:30:46.4 |
HIP 89649 |
14.62 |
| 2026-02-13 12:00 |
18:16:53.77 |
-01:29:54.0 |
HIP 89649 |
12.43 |
| 2026-02-14 00:00 |
18:17:02.00 |
-01:29:01.1 |
HIP 89649 |
10.27 |
| 2026-02-14 12:00 |
18:17:10.16 |
-01:28:07.9 |
HIP 89649 |
8.17 |
| 2026-02-15 00:00 |
18:17:18.27 |
-01:27:14.4 |
HIP 89649 |
6.17 |
| 2026-02-15 12:00 |
18:17:26.32 |
-01:26:20.5 |
HIP 89649 |
4.40 |
| 2026-02-16 00:00 |
18:17:34.31 |
-01:25:26.2 |
HIP 89649 |
3.23 |
| 2026-02-16 12:00 |
18:17:42.23 |
-01:24:31.6 |
HIP 89649 |
3.34 |
| 2026-02-17 00:00 |
18:17:50.10 |
-01:23:36.7 |
HIP 89649 |
4.62 |
| 2026-02-17 12:00 |
18:17:57.90 |
-01:22:41.4 |
HIP 89680 |
3.45 |
| 2026-02-18 00:00 |
18:18:05.64 |
-01:21:45.8 |
HIP 89680 |
1.95 |
| 2026-02-18 12:00 |
18:18:13.31 |
-01:20:49.8 |
HIP 89680 |
2.20 |
| 2026-02-19 00:00 |
18:18:20.92 |
-01:19:53.5 |
HIP 89680 |
3.85 |
| 2026-02-19 12:00 |
18:18:28.47 |
-01:18:56.9 |
HIP 89680 |
5.80 |
| 2026-02-20 00:00 |
18:18:35.95 |
-01:18:00.0 |
HIP 89680 |
7.82 |
| 2026-02-20 12:00 |
18:18:43.37 |
-01:17:02.7 |
HIP 89680 |
9.86 |
| 2026-02-21 00:00 |
18:18:50.72 |
-01:16:05.1 |
HIP 89680 |
11.90 |
| 2026-02-21 12:00 |
18:18:58.00 |
-01:15:07.2 |
HIP 89680 |
13.93 |
| 2026-02-22 00:00 |
18:19:05.22 |
-01:14:09.0 |
HIP 89680 |
15.96 |
| 2026-02-22 12:00 |
18:19:12.37 |
-01:13:10.5 |
HIP 89680 |
17.98 |
| 2026-02-23 00:00 |
18:19:19.45 |
-01:12:11.7 |
HIP 89680 |
19.99 |
| 2026-02-23 12:00 |
18:19:26.47 |
-01:11:12.5 |
HIP 89680 |
21.99 |
| 2026-02-24 00:00 |
18:19:33.41 |
-01:10:13.1 |
HIP 89680 |
23.97 |