メタデータ
| 項目 |
値 |
| Designation |
C/2009 F1 (Larson) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2009-06-25T21:16:44.184000Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:28Z |
| Obs used |
159 |
| NEO |
- |
| M1 |
14.900 |
| K1 |
11.500 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2009-03-26.0000000 |
| e |
0.98272497 |
| q (au) |
1.830683 |
| a (au) |
105.972834 |
| i (deg) |
171.375517 |
| Ω (om, deg) |
357.949401 |
| ω (w, deg) |
219.582076 |
| M (ma, deg) |
359.916983 |
等級
散乱 + 全体線形
$$
M_a = (12.846 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
12.846 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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) |
| 2026-03-26 00:00 |
22:56:30.89 |
-04:24:38.5 |
HIP 113345 |
26.60 |
| 2026-03-26 12:00 |
22:56:33.65 |
-04:24:20.1 |
HIP 113345 |
26.59 |
| 2026-03-27 00:00 |
22:56:36.41 |
-04:24:01.9 |
HIP 113345 |
26.59 |
| 2026-03-27 12:00 |
22:56:39.15 |
-04:23:43.6 |
HIP 113345 |
26.62 |
| 2026-03-28 00:00 |
22:56:41.88 |
-04:23:25.4 |
HIP 113345 |
26.68 |
| 2026-03-28 12:00 |
22:56:44.60 |
-04:23:07.3 |
HIP 113345 |
26.75 |
| 2026-03-29 00:00 |
22:56:47.31 |
-04:22:49.2 |
HIP 113440 |
26.71 |
| 2026-03-29 12:00 |
22:56:50.00 |
-04:22:31.2 |
HIP 113440 |
26.15 |
| 2026-03-30 00:00 |
22:56:52.69 |
-04:22:13.2 |
HIP 113440 |
25.60 |
| 2026-03-30 12:00 |
22:56:55.36 |
-04:21:55.3 |
HIP 113440 |
25.06 |
| 2026-03-31 00:00 |
22:56:58.02 |
-04:21:37.4 |
HIP 113440 |
24.54 |
| 2026-03-31 12:00 |
22:57:00.67 |
-04:21:19.6 |
HIP 113440 |
24.03 |
| 2026-04-01 00:00 |
22:57:03.31 |
-04:21:01.8 |
HIP 113440 |
23.53 |
| 2026-04-01 12:00 |
22:57:05.93 |
-04:20:44.2 |
HIP 113440 |
23.05 |
| 2026-04-02 00:00 |
22:57:08.54 |
-04:20:26.5 |
HIP 113440 |
22.58 |
| 2026-04-02 12:00 |
22:57:11.14 |
-04:20:09.0 |
HIP 113440 |
22.12 |
| 2026-04-03 00:00 |
22:57:13.73 |
-04:19:51.5 |
HIP 113440 |
21.69 |
| 2026-04-03 12:00 |
22:57:16.30 |
-04:19:34.0 |
HIP 113440 |
21.27 |
| 2026-04-04 00:00 |
22:57:18.86 |
-04:19:16.7 |
HIP 113440 |
20.87 |
| 2026-04-04 12:00 |
22:57:21.40 |
-04:18:59.4 |
HIP 113440 |
20.48 |
| 2026-04-05 00:00 |
22:57:23.93 |
-04:18:42.1 |
HIP 113440 |
20.12 |
| 2026-04-05 12:00 |
22:57:26.45 |
-04:18:25.0 |
HIP 113440 |
19.77 |
| 2026-04-06 00:00 |
22:57:28.96 |
-04:18:07.9 |
HIP 113440 |
19.45 |
| 2026-04-06 12:00 |
22:57:31.44 |
-04:17:50.9 |
HIP 113440 |
19.14 |
| 2026-04-07 00:00 |
22:57:33.92 |
-04:17:33.9 |
HIP 113440 |
18.86 |
| 2026-04-07 12:00 |
22:57:36.38 |
-04:17:17.1 |
HIP 113440 |
18.60 |
| 2026-04-08 00:00 |
22:57:38.82 |
-04:17:00.3 |
HIP 113440 |
18.36 |
| 2026-04-08 12:00 |
22:57:41.25 |
-04:16:43.6 |
HIP 113440 |
18.15 |
| 2026-04-09 00:00 |
22:57:43.67 |
-04:16:26.9 |
HIP 113440 |
17.96 |
| 2026-04-09 12:00 |
22:57:46.07 |
-04:16:10.4 |
HIP 113440 |
17.79 |
| 2026-04-10 00:00 |
22:57:48.45 |
-04:15:53.9 |
HIP 113440 |
17.65 |
| 2026-04-10 12:00 |
22:57:50.82 |
-04:15:37.5 |
HIP 113440 |
17.53 |
| 2026-04-11 00:00 |
22:57:53.17 |
-04:15:21.2 |
HIP 113440 |
17.44 |
| 2026-04-11 12:00 |
22:57:55.51 |
-04:15:04.9 |
HIP 113440 |
17.37 |
| 2026-04-12 00:00 |
22:57:57.83 |
-04:14:48.8 |
HIP 113440 |
17.33 |
| 2026-04-12 12:00 |
22:58:00.13 |
-04:14:32.7 |
HIP 113440 |
17.31 |
| 2026-04-13 00:00 |
22:58:02.42 |
-04:14:16.8 |
HIP 113440 |
17.31 |
| 2026-04-13 12:00 |
22:58:04.69 |
-04:14:00.9 |
HIP 113440 |
17.34 |
| 2026-04-14 00:00 |
22:58:06.94 |
-04:13:45.1 |
HIP 113440 |
17.38 |
| 2026-04-14 12:00 |
22:58:09.18 |
-04:13:29.4 |
HIP 113440 |
17.45 |
| 2026-04-15 00:00 |
22:58:11.39 |
-04:13:13.8 |
HIP 113440 |
17.55 |
| 2026-04-15 12:00 |
22:58:13.59 |
-04:12:58.3 |
HIP 113440 |
17.66 |
| 2026-04-16 00:00 |
22:58:15.78 |
-04:12:42.9 |
HIP 113440 |
17.79 |