メタデータ
| 項目 |
値 |
| Designation |
279P/La Sagra |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-10-09T20:52:39.947520Z |
| Orbit solution date (soln_date, UTC) |
2024-01-04T23:43:56Z |
| Obs used |
290 |
| NEO |
- |
| M1 |
16.000 |
| K1 |
8.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-10-26.0000000 |
| e |
0.39785019 |
| q (au) |
2.152931 |
| a (au) |
3.575408 |
| i (deg) |
5.051399 |
| Ω (om, deg) |
346.279437 |
| ω (w, deg) |
6.015546 |
| M (ma, deg) |
162.132940 |
等級
散乱 + 全体線形
$$
M_a = (18.300 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.300 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.309 |
| 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 |
10:18:23.90 |
+10:44:20.9 |
HIP 50611 |
29.07 |
| 2026-05-12 12:00 |
10:18:26.91 |
+10:43:50.1 |
HIP 50611 |
28.50 |
| 2026-05-13 00:00 |
10:18:30.10 |
+10:43:18.3 |
HIP 50611 |
27.92 |
| 2026-05-13 12:00 |
10:18:33.47 |
+10:42:45.5 |
HIP 50611 |
27.32 |
| 2026-05-14 00:00 |
10:18:37.04 |
+10:42:11.7 |
HIP 50611 |
26.70 |
| 2026-05-14 12:00 |
10:18:40.78 |
+10:41:36.9 |
HIP 50611 |
26.08 |
| 2026-05-15 00:00 |
10:18:44.72 |
+10:41:01.0 |
HIP 50611 |
25.45 |
| 2026-05-15 12:00 |
10:18:48.83 |
+10:40:24.2 |
HIP 50611 |
24.83 |
| 2026-05-16 00:00 |
10:18:53.13 |
+10:39:46.4 |
HIP 50611 |
24.22 |
| 2026-05-16 12:00 |
10:18:57.61 |
+10:39:07.5 |
HIP 50611 |
23.63 |
| 2026-05-17 00:00 |
10:19:02.27 |
+10:38:27.7 |
HIP 50611 |
23.07 |
| 2026-05-17 12:00 |
10:19:07.12 |
+10:37:46.8 |
HIP 50611 |
22.55 |
| 2026-05-18 00:00 |
10:19:12.14 |
+10:37:05.0 |
HIP 50611 |
22.08 |
| 2026-05-18 12:00 |
10:19:17.34 |
+10:36:22.2 |
HIP 50611 |
21.68 |
| 2026-05-19 00:00 |
10:19:22.72 |
+10:35:38.4 |
HIP 50611 |
21.35 |
| 2026-05-19 12:00 |
10:19:28.28 |
+10:34:53.7 |
HIP 50611 |
21.12 |
| 2026-05-20 00:00 |
10:19:34.01 |
+10:34:07.9 |
HIP 50611 |
20.99 |
| 2026-05-20 12:00 |
10:19:39.92 |
+10:33:21.2 |
HIP 50611 |
20.97 |
| 2026-05-21 00:00 |
10:19:46.01 |
+10:32:33.6 |
HIP 50611 |
21.08 |
| 2026-05-21 12:00 |
10:19:52.27 |
+10:31:45.0 |
HIP 50611 |
21.33 |
| 2026-05-22 00:00 |
10:19:58.70 |
+10:30:55.4 |
HIP 50611 |
21.73 |
| 2026-05-22 12:00 |
10:20:05.30 |
+10:30:04.9 |
HIP 50611 |
22.26 |
| 2026-05-23 00:00 |
10:20:12.07 |
+10:29:13.4 |
HIP 50611 |
22.95 |
| 2026-05-23 12:00 |
10:20:19.01 |
+10:28:21.0 |
HIP 50611 |
23.78 |
| 2026-05-24 00:00 |
10:20:26.12 |
+10:27:27.7 |
HIP 50611 |
24.75 |
| 2026-05-24 12:00 |
10:20:33.40 |
+10:26:33.5 |
HIP 50611 |
25.85 |
| 2026-05-25 00:00 |
10:20:40.84 |
+10:25:38.3 |
HIP 50611 |
27.08 |
| 2026-05-25 12:00 |
10:20:48.45 |
+10:24:42.2 |
HIP 50611 |
28.43 |
| 2026-05-26 00:00 |
10:20:56.23 |
+10:23:45.2 |
HIP 50611 |
29.89 |
| 2026-05-26 12:00 |
10:21:04.16 |
+10:22:47.3 |
HIP 50611 |
31.46 |
| 2026-05-27 00:00 |
10:21:12.26 |
+10:21:48.5 |
HIP 50611 |
33.13 |
| 2026-05-27 12:00 |
10:21:20.52 |
+10:20:48.8 |
HIP 50611 |
34.88 |
| 2026-05-28 00:00 |
10:21:28.94 |
+10:19:48.2 |
HIP 50812 |
35.14 |
| 2026-05-28 12:00 |
10:21:37.52 |
+10:18:46.7 |
HIP 50812 |
33.39 |
| 2026-05-29 00:00 |
10:21:46.26 |
+10:17:44.4 |
HIP 50812 |
31.69 |
| 2026-05-29 12:00 |
10:21:55.16 |
+10:16:41.1 |
HIP 50812 |
30.07 |
| 2026-05-30 00:00 |
10:22:04.21 |
+10:15:37.0 |
HIP 50812 |
28.53 |
| 2026-05-30 12:00 |
10:22:13.42 |
+10:14:32.0 |
HIP 50812 |
27.12 |
| 2026-05-31 00:00 |
10:22:22.78 |
+10:13:26.1 |
HIP 50812 |
25.86 |
| 2026-05-31 12:00 |
10:22:32.30 |
+10:12:19.4 |
HIP 50812 |
24.78 |
| 2026-06-01 00:00 |
10:22:41.97 |
+10:11:11.8 |
HIP 50812 |
23.94 |
| 2026-06-01 12:00 |
10:22:51.79 |
+10:10:03.3 |
HIP 50812 |
23.35 |
| 2026-06-02 00:00 |
10:23:01.76 |
+10:08:54.1 |
HIP 50812 |
23.07 |