C/2009 F1 (Larson)
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) |
| 2026-02-03 00:00 |
22:51:33.25 |
-04:55:48.0 |
HIP 113011 |
34.46 |
| 2026-02-03 12:00 |
22:51:35.94 |
-04:55:32.0 |
HIP 113011 |
34.18 |
| 2026-02-04 00:00 |
22:51:38.64 |
-04:55:16.0 |
HIP 113011 |
33.91 |
| 2026-02-04 12:00 |
22:51:41.35 |
-04:54:59.8 |
HIP 113011 |
33.65 |
| 2026-02-05 00:00 |
22:51:44.07 |
-04:54:43.6 |
HIP 113011 |
33.41 |
| 2026-02-05 12:00 |
22:51:46.81 |
-04:54:27.3 |
HIP 113056 |
32.86 |
| 2026-02-06 00:00 |
22:51:49.55 |
-04:54:10.9 |
HIP 113056 |
32.13 |
| 2026-02-06 12:00 |
22:51:52.31 |
-04:53:54.4 |
HIP 113056 |
31.39 |
| 2026-02-07 00:00 |
22:51:55.07 |
-04:53:37.8 |
HIP 113056 |
30.65 |
| 2026-02-07 12:00 |
22:51:57.85 |
-04:53:21.2 |
HIP 113056 |
29.91 |
| 2026-02-08 00:00 |
22:52:00.64 |
-04:53:04.4 |
HIP 113056 |
29.17 |
| 2026-02-08 12:00 |
22:52:03.44 |
-04:52:47.6 |
HIP 113056 |
28.42 |
| 2026-02-09 00:00 |
22:52:06.25 |
-04:52:30.7 |
HIP 113056 |
27.67 |
| 2026-02-09 12:00 |
22:52:09.06 |
-04:52:13.8 |
HIP 113056 |
26.92 |
| 2026-02-10 00:00 |
22:52:11.89 |
-04:51:56.7 |
HIP 113056 |
26.16 |
| 2026-02-10 12:00 |
22:52:14.73 |
-04:51:39.6 |
HIP 113056 |
25.41 |
| 2026-02-11 00:00 |
22:52:17.57 |
-04:51:22.4 |
HIP 113056 |
24.65 |
| 2026-02-11 12:00 |
22:52:20.42 |
-04:51:05.1 |
HIP 113056 |
23.89 |
| 2026-02-12 00:00 |
22:52:23.29 |
-04:50:47.8 |
HIP 113056 |
23.12 |
| 2026-02-12 12:00 |
22:52:26.16 |
-04:50:30.3 |
HIP 113056 |
22.36 |
| 2026-02-13 00:00 |
22:52:29.04 |
-04:50:12.9 |
HIP 113056 |
21.59 |
| 2026-02-13 12:00 |
22:52:31.92 |
-04:49:55.3 |
HIP 113056 |
20.82 |
| 2026-02-14 00:00 |
22:52:34.82 |
-04:49:37.7 |
HIP 113056 |
20.05 |
| 2026-02-14 12:00 |
22:52:37.72 |
-04:49:20.0 |
HIP 113056 |
19.28 |
| 2026-02-15 00:00 |
22:52:40.63 |
-04:49:02.3 |
HIP 113056 |
18.51 |
| 2026-02-15 12:00 |
22:52:43.55 |
-04:48:44.5 |
HIP 113056 |
17.73 |
| 2026-02-16 00:00 |
22:52:46.47 |
-04:48:26.6 |
HIP 113056 |
16.96 |
| 2026-02-16 12:00 |
22:52:49.40 |
-04:48:08.7 |
HIP 113056 |
16.18 |
| 2026-02-17 00:00 |
22:52:52.33 |
-04:47:50.7 |
HIP 113056 |
15.40 |
| 2026-02-17 12:00 |
22:52:55.27 |
-04:47:32.6 |
HIP 113056 |
14.62 |
| 2026-02-18 00:00 |
22:52:58.22 |
-04:47:14.5 |
HIP 113056 |
13.85 |
| 2026-02-18 12:00 |
22:53:01.17 |
-04:46:56.4 |
HIP 113056 |
13.07 |
| 2026-02-19 00:00 |
22:53:04.13 |
-04:46:38.2 |
HIP 113056 |
12.29 |
| 2026-02-19 12:00 |
22:53:07.10 |
-04:46:19.9 |
HIP 113056 |
11.52 |
| 2026-02-20 00:00 |
22:53:10.06 |
-04:46:01.6 |
HIP 113056 |
10.75 |
| 2026-02-20 12:00 |
22:53:13.04 |
-04:45:43.3 |
HIP 113056 |
9.97 |
| 2026-02-21 00:00 |
22:53:16.01 |
-04:45:24.9 |
HIP 113056 |
9.21 |
| 2026-02-21 12:00 |
22:53:18.99 |
-04:45:06.5 |
HIP 113056 |
8.45 |
| 2026-02-22 00:00 |
22:53:21.98 |
-04:44:48.0 |
HIP 113056 |
7.69 |
| 2026-02-22 12:00 |
22:53:24.97 |
-04:44:29.5 |
HIP 113056 |
6.95 |
| 2026-02-23 00:00 |
22:53:27.96 |
-04:44:10.9 |
HIP 113056 |
6.22 |
| 2026-02-23 12:00 |
22:53:30.95 |
-04:43:52.3 |
HIP 113056 |
5.51 |
| 2026-02-24 00:00 |
22:53:33.95 |
-04:43:33.7 |
HIP 113056 |
4.84 |