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) |
| 2026-05-12 00:00 |
18:20:47.34 |
+01:41:26.6 |
HIP 90035 |
22.47 |
| 2026-05-12 12:00 |
18:20:41.08 |
+01:42:22.0 |
HIP 90035 |
24.01 |
| 2026-05-13 00:00 |
18:20:34.75 |
+01:43:17.1 |
HIP 90035 |
25.61 |
| 2026-05-13 12:00 |
18:20:28.34 |
+01:44:11.7 |
HIP 89768 |
26.99 |
| 2026-05-14 00:00 |
18:20:21.86 |
+01:45:05.9 |
HIP 89768 |
26.41 |
| 2026-05-14 12:00 |
18:20:15.30 |
+01:45:59.6 |
HIP 89768 |
25.93 |
| 2026-05-15 00:00 |
18:20:08.67 |
+01:46:52.9 |
HIP 89768 |
25.56 |
| 2026-05-15 12:00 |
18:20:01.97 |
+01:47:45.8 |
HIP 89768 |
25.31 |
| 2026-05-16 00:00 |
18:19:55.20 |
+01:48:38.3 |
HIP 89768 |
25.19 |
| 2026-05-16 12:00 |
18:19:48.35 |
+01:49:30.3 |
HIP 89768 |
25.19 |
| 2026-05-17 00:00 |
18:19:41.43 |
+01:50:21.8 |
HIP 89768 |
25.33 |
| 2026-05-17 12:00 |
18:19:34.44 |
+01:51:12.9 |
HIP 89768 |
25.60 |
| 2026-05-18 00:00 |
18:19:27.38 |
+01:52:03.5 |
HIP 89768 |
26.00 |
| 2026-05-18 12:00 |
18:19:20.26 |
+01:52:53.7 |
HIP 89768 |
26.53 |
| 2026-05-19 00:00 |
18:19:13.06 |
+01:53:43.4 |
HIP 89768 |
27.19 |
| 2026-05-19 12:00 |
18:19:05.80 |
+01:54:32.6 |
HIP 89768 |
27.96 |
| 2026-05-20 00:00 |
18:18:58.47 |
+01:55:21.3 |
HIP 89608 |
27.06 |
| 2026-05-20 12:00 |
18:18:51.07 |
+01:56:09.5 |
HIP 89608 |
25.31 |
| 2026-05-21 00:00 |
18:18:43.61 |
+01:56:57.3 |
HIP 89608 |
23.57 |
| 2026-05-21 12:00 |
18:18:36.09 |
+01:57:44.5 |
HIP 89608 |
21.87 |
| 2026-05-22 00:00 |
18:18:28.50 |
+01:58:31.3 |
HIP 89608 |
20.22 |
| 2026-05-22 12:00 |
18:18:20.84 |
+01:59:17.5 |
HIP 89608 |
18.63 |
| 2026-05-23 00:00 |
18:18:13.13 |
+02:00:03.3 |
HIP 89608 |
17.12 |
| 2026-05-23 12:00 |
18:18:05.35 |
+02:00:48.5 |
HIP 89608 |
15.72 |
| 2026-05-24 00:00 |
18:17:57.52 |
+02:01:33.3 |
HIP 89608 |
14.47 |
| 2026-05-24 12:00 |
18:17:49.62 |
+02:02:17.5 |
HIP 89608 |
13.42 |
| 2026-05-25 00:00 |
18:17:41.66 |
+02:03:01.2 |
HIP 89608 |
12.62 |
| 2026-05-25 12:00 |
18:17:33.65 |
+02:03:44.3 |
HIP 89608 |
12.12 |
| 2026-05-26 00:00 |
18:17:25.58 |
+02:04:27.0 |
HIP 89608 |
11.97 |
| 2026-05-26 12:00 |
18:17:17.45 |
+02:05:09.1 |
HIP 89608 |
12.19 |
| 2026-05-27 00:00 |
18:17:09.26 |
+02:05:50.7 |
HIP 89608 |
12.77 |
| 2026-05-27 12:00 |
18:17:01.02 |
+02:06:31.7 |
HIP 89608 |
13.65 |
| 2026-05-28 00:00 |
18:16:52.73 |
+02:07:12.2 |
HIP 89608 |
14.81 |
| 2026-05-28 12:00 |
18:16:44.38 |
+02:07:52.2 |
HIP 89608 |
16.17 |
| 2026-05-29 00:00 |
18:16:35.98 |
+02:08:31.6 |
HIP 89527 |
16.04 |
| 2026-05-29 12:00 |
18:16:27.53 |
+02:09:10.5 |
HIP 89527 |
14.55 |
| 2026-05-30 00:00 |
18:16:19.02 |
+02:09:48.8 |
HIP 89527 |
13.27 |
| 2026-05-30 12:00 |
18:16:10.47 |
+02:10:26.5 |
HIP 89527 |
12.27 |
| 2026-05-31 00:00 |
18:16:01.86 |
+02:11:03.7 |
HIP 89527 |
11.63 |
| 2026-05-31 12:00 |
18:15:53.21 |
+02:11:40.3 |
HIP 89527 |
11.41 |
| 2026-06-01 00:00 |
18:15:44.51 |
+02:12:16.4 |
HIP 89527 |
11.64 |
| 2026-06-01 12:00 |
18:15:35.76 |
+02:12:51.9 |
HIP 89527 |
12.30 |
| 2026-06-02 00:00 |
18:15:26.96 |
+02:13:26.8 |
HIP 89527 |
13.34 |