メタデータ
| 項目 |
値 |
| Designation |
C/2013 H1 (La Sagra) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-05-19T16:02:02.639040Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:34Z |
| Obs used |
270 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
22.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2013-05-18.0000000 |
| e |
0.98542562 |
| q (au) |
2.646966 |
| a (au) |
181.617687 |
| i (deg) |
27.089519 |
| Ω (om, deg) |
84.969862 |
| ω (w, deg) |
136.581161 |
| M (ma, deg) |
359.999328 |
等級
散乱 + 全体線形
$$
M_a = (11.300 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
11.300 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
0.800 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
01:19:26.76 |
-21:13:58.9 |
HIP 6225 |
14.16 |
| 2026-09-20 12:00 |
01:19:23.19 |
-21:14:27.6 |
HIP 6225 |
14.03 |
| 2026-09-21 00:00 |
01:19:19.61 |
-21:14:56.1 |
HIP 6225 |
13.98 |
| 2026-09-21 12:00 |
01:19:16.02 |
-21:15:24.4 |
HIP 6225 |
13.99 |
| 2026-09-22 00:00 |
01:19:12.41 |
-21:15:52.6 |
HIP 6225 |
14.07 |
| 2026-09-22 12:00 |
01:19:08.78 |
-21:16:20.5 |
HIP 6225 |
14.23 |
| 2026-09-23 00:00 |
01:19:05.15 |
-21:16:48.3 |
HIP 6225 |
14.45 |
| 2026-09-23 12:00 |
01:19:01.50 |
-21:17:15.9 |
HIP 6225 |
14.73 |
| 2026-09-24 00:00 |
01:18:57.83 |
-21:17:43.2 |
HIP 6225 |
15.08 |
| 2026-09-24 12:00 |
01:18:54.16 |
-21:18:10.4 |
HIP 6225 |
15.48 |
| 2026-09-25 00:00 |
01:18:50.47 |
-21:18:37.4 |
HIP 6225 |
15.94 |
| 2026-09-25 12:00 |
01:18:46.77 |
-21:19:04.2 |
HIP 6225 |
16.44 |
| 2026-09-26 00:00 |
01:18:43.05 |
-21:19:30.8 |
HIP 6225 |
16.99 |
| 2026-09-26 12:00 |
01:18:39.33 |
-21:19:57.2 |
HIP 6225 |
17.58 |
| 2026-09-27 00:00 |
01:18:35.59 |
-21:20:23.3 |
HIP 6225 |
18.21 |
| 2026-09-27 12:00 |
01:18:31.85 |
-21:20:49.3 |
HIP 6225 |
18.87 |
| 2026-09-28 00:00 |
01:18:28.09 |
-21:21:15.0 |
HIP 6225 |
19.56 |
| 2026-09-28 12:00 |
01:18:24.32 |
-21:21:40.6 |
HIP 6225 |
20.27 |
| 2026-09-29 00:00 |
01:18:20.54 |
-21:22:05.9 |
HIP 6225 |
21.01 |
| 2026-09-29 12:00 |
01:18:16.76 |
-21:22:31.0 |
HIP 6225 |
21.77 |
| 2026-09-30 00:00 |
01:18:12.96 |
-21:22:55.9 |
HIP 6225 |
22.55 |
| 2026-09-30 12:00 |
01:18:09.15 |
-21:23:20.5 |
HIP 6225 |
23.35 |
| 2026-10-01 00:00 |
01:18:05.34 |
-21:23:44.9 |
HIP 6225 |
24.16 |
| 2026-10-01 12:00 |
01:18:01.51 |
-21:24:09.1 |
HIP 6225 |
24.99 |
| 2026-10-02 00:00 |
01:17:57.68 |
-21:24:33.1 |
HIP 5924 |
25.20 |
| 2026-10-02 12:00 |
01:17:53.84 |
-21:24:56.9 |
HIP 5924 |
24.26 |
| 2026-10-03 00:00 |
01:17:50.00 |
-21:25:20.4 |
HIP 5924 |
23.31 |
| 2026-10-03 12:00 |
01:17:46.14 |
-21:25:43.6 |
HIP 5924 |
22.36 |
| 2026-10-04 00:00 |
01:17:42.28 |
-21:26:06.7 |
HIP 5924 |
21.42 |
| 2026-10-04 12:00 |
01:17:38.41 |
-21:26:29.4 |
HIP 5924 |
20.48 |
| 2026-10-05 00:00 |
01:17:34.54 |
-21:26:52.0 |
HIP 5924 |
19.54 |
| 2026-10-05 12:00 |
01:17:30.66 |
-21:27:14.3 |
HIP 5924 |
18.60 |
| 2026-10-06 00:00 |
01:17:26.77 |
-21:27:36.3 |
HIP 5924 |
17.67 |
| 2026-10-06 12:00 |
01:17:22.88 |
-21:27:58.1 |
HIP 5924 |
16.74 |
| 2026-10-07 00:00 |
01:17:18.99 |
-21:28:19.7 |
HIP 5924 |
15.82 |
| 2026-10-07 12:00 |
01:17:15.09 |
-21:28:41.0 |
HIP 5924 |
14.90 |
| 2026-10-08 00:00 |
01:17:11.18 |
-21:29:02.0 |
HIP 5924 |
13.99 |
| 2026-10-08 12:00 |
01:17:07.27 |
-21:29:22.8 |
HIP 5924 |
13.09 |
| 2026-10-09 00:00 |
01:17:03.36 |
-21:29:43.3 |
HIP 5924 |
12.19 |
| 2026-10-09 12:00 |
01:16:59.45 |
-21:30:03.5 |
HIP 5924 |
11.31 |
| 2026-10-10 00:00 |
01:16:55.53 |
-21:30:23.5 |
HIP 5924 |
10.45 |
| 2026-10-10 12:00 |
01:16:51.61 |
-21:30:43.2 |
HIP 5924 |
9.60 |
| 2026-10-11 00:00 |
01:16:47.69 |
-21:31:02.7 |
HIP 5924 |
8.77 |