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 |
0.969 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.307 |
| 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) |
| 2026-09-20 00:00 |
11:35:49.73 |
+02:03:30.7 |
HIP 56681 |
23.70 |
| 2026-09-20 12:00 |
11:36:13.76 |
+02:00:45.6 |
HIP 56681 |
17.16 |
| 2026-09-21 00:00 |
11:36:37.78 |
+01:58:00.5 |
HIP 56681 |
10.70 |
| 2026-09-21 12:00 |
11:37:01.80 |
+01:55:15.3 |
HIP 56681 |
4.66 |
| 2026-09-22 00:00 |
11:37:25.81 |
+01:52:30.2 |
HIP 56681 |
4.01 |
| 2026-09-22 12:00 |
11:37:49.81 |
+01:49:45.0 |
HIP 56755 |
7.62 |
| 2026-09-23 00:00 |
11:38:13.81 |
+01:46:59.8 |
HIP 56755 |
8.66 |
| 2026-09-23 12:00 |
11:38:37.79 |
+01:44:14.7 |
HIP 56755 |
13.38 |
| 2026-09-24 00:00 |
11:39:01.77 |
+01:41:29.5 |
HIP 56856 |
10.50 |
| 2026-09-24 12:00 |
11:39:25.73 |
+01:38:44.4 |
HIP 56856 |
6.02 |
| 2026-09-25 00:00 |
11:39:49.69 |
+01:35:59.3 |
HIP 56856 |
7.01 |
| 2026-09-25 12:00 |
11:40:13.63 |
+01:33:14.2 |
HIP 56938 |
3.47 |
| 2026-09-26 00:00 |
11:40:37.56 |
+01:30:29.1 |
HIP 56938 |
6.67 |
| 2026-09-26 12:00 |
11:41:01.48 |
+01:27:44.0 |
HIP 56938 |
12.79 |
| 2026-09-27 00:00 |
11:41:25.39 |
+01:24:59.0 |
HIP 56938 |
19.21 |
| 2026-09-27 12:00 |
11:41:49.28 |
+01:22:14.0 |
HIP 57042 |
22.68 |
| 2026-09-28 00:00 |
11:42:13.16 |
+01:19:29.0 |
HIP 57042 |
21.33 |
| 2026-09-28 12:00 |
11:42:37.03 |
+01:16:44.1 |
HIP 57042 |
21.95 |
| 2026-09-29 00:00 |
11:43:00.88 |
+01:13:59.2 |
HIP 57042 |
24.39 |
| 2026-09-29 12:00 |
11:43:24.72 |
+01:11:14.4 |
HIP 57152 |
25.53 |
| 2026-09-30 00:00 |
11:43:48.55 |
+01:08:29.6 |
HIP 57152 |
24.04 |
| 2026-09-30 12:00 |
11:44:12.35 |
+01:05:44.8 |
HIP 57317 |
17.69 |
| 2026-10-01 00:00 |
11:44:36.14 |
+01:03:00.1 |
HIP 57317 |
11.46 |
| 2026-10-01 12:00 |
11:44:59.92 |
+01:00:15.5 |
HIP 57317 |
5.97 |
| 2026-10-02 00:00 |
11:45:23.67 |
+00:57:30.9 |
HIP 57317 |
5.06 |
| 2026-10-02 12:00 |
11:45:47.41 |
+00:54:46.4 |
HIP 57317 |
10.05 |
| 2026-10-03 00:00 |
11:46:11.13 |
+00:52:02.0 |
HIP 57317 |
16.18 |
| 2026-10-03 12:00 |
11:46:34.83 |
+00:49:17.6 |
HIP 57548 |
17.32 |
| 2026-10-04 00:00 |
11:46:58.51 |
+00:46:33.4 |
HIP 57548 |
11.54 |
| 2026-10-04 12:00 |
11:47:22.17 |
+00:43:49.2 |
HIP 57548 |
7.17 |
| 2026-10-05 00:00 |
11:47:45.81 |
+00:41:05.1 |
HIP 57548 |
7.38 |
| 2026-10-05 12:00 |
11:48:09.43 |
+00:38:21.1 |
HIP 57548 |
11.93 |
| 2026-10-06 00:00 |
11:48:33.03 |
+00:35:37.2 |
HIP 57658 |
13.81 |
| 2026-10-06 12:00 |
11:48:56.60 |
+00:32:53.3 |
HIP 57658 |
8.69 |
| 2026-10-07 00:00 |
11:49:20.15 |
+00:30:09.7 |
HIP 57658 |
6.69 |
| 2026-10-07 12:00 |
11:49:43.68 |
+00:27:26.1 |
HIP 57658 |
9.91 |
| 2026-10-08 00:00 |
11:50:07.18 |
+00:24:42.6 |
HIP 57658 |
15.34 |
| 2026-10-08 12:00 |
11:50:30.65 |
+00:21:59.3 |
HIP 57658 |
21.36 |
| 2026-10-09 00:00 |
11:50:54.10 |
+00:19:16.0 |
HIP 57878 |
20.80 |
| 2026-10-09 12:00 |
11:51:17.52 |
+00:16:33.0 |
HIP 57878 |
14.57 |
| 2026-10-10 00:00 |
11:51:40.91 |
+00:13:50.0 |
HIP 57878 |
8.68 |
| 2026-10-10 12:00 |
11:52:04.28 |
+00:11:07.2 |
HIP 57878 |
4.64 |
| 2026-10-11 00:00 |
11:52:27.61 |
+00:08:24.6 |
HIP 57878 |
7.11 |