C/2008 FK75 (Lemmon-Siding Spring)
メタデータ
| 項目 |
値 |
| Designation |
C/2008 FK75 (Lemmon-Siding Spring) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-09-29T05:04:17.762880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:18Z |
| Obs used |
3622 |
| NEO |
- |
| M1 |
9.700 |
| K1 |
5.250 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2010-07-21.0000000 |
| e |
1.00270288 |
| q (au) |
4.510895 |
| a (au) |
-1668.924210 |
| i (deg) |
61.175512 |
| Ω (om, deg) |
218.266231 |
| ω (w, deg) |
80.415044 |
| M (ma, deg) |
-0.001015 |
等級
散乱 + 全体線形
$$
M_a = (8.925 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.925 |
| n |
2.000 |
| gf |
0.988 |
| gb |
-1.000 |
| k |
0.999 |
| δ90 |
1.000 |
| 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 |
03:59:48.41 |
-10:51:53.6 |
HIP 18655 |
32.64 |
| 2026-02-03 12:00 |
03:59:47.48 |
-10:51:31.5 |
HIP 18655 |
32.26 |
| 2026-02-04 00:00 |
03:59:46.58 |
-10:51:09.3 |
HIP 18655 |
31.87 |
| 2026-02-04 12:00 |
03:59:45.72 |
-10:50:46.9 |
HIP 18655 |
31.48 |
| 2026-02-05 00:00 |
03:59:44.88 |
-10:50:24.4 |
HIP 18655 |
31.09 |
| 2026-02-05 12:00 |
03:59:44.09 |
-10:50:01.7 |
HIP 18655 |
30.70 |
| 2026-02-06 00:00 |
03:59:43.32 |
-10:49:38.9 |
HIP 18655 |
30.32 |
| 2026-02-06 12:00 |
03:59:42.59 |
-10:49:16.0 |
HIP 18655 |
29.92 |
| 2026-02-07 00:00 |
03:59:41.89 |
-10:48:52.9 |
HIP 18655 |
29.53 |
| 2026-02-07 12:00 |
03:59:41.22 |
-10:48:29.7 |
HIP 18655 |
29.14 |
| 2026-02-08 00:00 |
03:59:40.59 |
-10:48:06.3 |
HIP 18655 |
28.74 |
| 2026-02-08 12:00 |
03:59:39.99 |
-10:47:42.8 |
HIP 18655 |
28.35 |
| 2026-02-09 00:00 |
03:59:39.42 |
-10:47:19.2 |
HIP 18655 |
27.95 |
| 2026-02-09 12:00 |
03:59:38.88 |
-10:46:55.5 |
HIP 18655 |
27.55 |
| 2026-02-10 00:00 |
03:59:38.38 |
-10:46:31.6 |
HIP 18655 |
27.15 |
| 2026-02-10 12:00 |
03:59:37.92 |
-10:46:07.6 |
HIP 18655 |
26.75 |
| 2026-02-11 00:00 |
03:59:37.48 |
-10:45:43.5 |
HIP 18655 |
26.35 |
| 2026-02-11 12:00 |
03:59:37.09 |
-10:45:19.3 |
HIP 18655 |
25.95 |
| 2026-02-12 00:00 |
03:59:36.72 |
-10:44:54.9 |
HIP 18655 |
25.54 |
| 2026-02-12 12:00 |
03:59:36.39 |
-10:44:30.5 |
HIP 18655 |
25.13 |
| 2026-02-13 00:00 |
03:59:36.09 |
-10:44:05.9 |
HIP 18655 |
24.72 |
| 2026-02-13 12:00 |
03:59:35.82 |
-10:43:41.2 |
HIP 18655 |
24.31 |
| 2026-02-14 00:00 |
03:59:35.59 |
-10:43:16.4 |
HIP 18655 |
23.90 |
| 2026-02-14 12:00 |
03:59:35.39 |
-10:42:51.6 |
HIP 18655 |
23.49 |
| 2026-02-15 00:00 |
03:59:35.23 |
-10:42:26.6 |
HIP 18655 |
23.07 |
| 2026-02-15 12:00 |
03:59:35.10 |
-10:42:01.5 |
HIP 18655 |
22.65 |
| 2026-02-16 00:00 |
03:59:35.00 |
-10:41:36.3 |
HIP 18655 |
22.23 |
| 2026-02-16 12:00 |
03:59:34.94 |
-10:41:11.0 |
HIP 18655 |
21.81 |
| 2026-02-17 00:00 |
03:59:34.91 |
-10:40:45.6 |
HIP 18655 |
21.39 |
| 2026-02-17 12:00 |
03:59:34.91 |
-10:40:20.2 |
HIP 18655 |
20.97 |
| 2026-02-18 00:00 |
03:59:34.95 |
-10:39:54.6 |
HIP 18655 |
20.54 |
| 2026-02-18 12:00 |
03:59:35.02 |
-10:39:29.0 |
HIP 18655 |
20.11 |
| 2026-02-19 00:00 |
03:59:35.13 |
-10:39:03.3 |
HIP 18655 |
19.68 |
| 2026-02-19 12:00 |
03:59:35.27 |
-10:38:37.5 |
HIP 18655 |
19.25 |
| 2026-02-20 00:00 |
03:59:35.44 |
-10:38:11.6 |
HIP 18655 |
18.82 |
| 2026-02-20 12:00 |
03:59:35.64 |
-10:37:45.6 |
HIP 18655 |
18.39 |
| 2026-02-21 00:00 |
03:59:35.88 |
-10:37:19.6 |
HIP 18655 |
17.95 |
| 2026-02-21 12:00 |
03:59:36.16 |
-10:36:53.5 |
HIP 18655 |
17.52 |
| 2026-02-22 00:00 |
03:59:36.46 |
-10:36:27.4 |
HIP 18655 |
17.08 |
| 2026-02-22 12:00 |
03:59:36.80 |
-10:36:01.2 |
HIP 18655 |
16.64 |
| 2026-02-23 00:00 |
03:59:37.17 |
-10:35:34.9 |
HIP 18655 |
16.21 |
| 2026-02-23 12:00 |
03:59:37.58 |
-10:35:08.5 |
HIP 18655 |
15.77 |
| 2026-02-24 00:00 |
03:59:38.02 |
-10:34:42.2 |
HIP 18655 |
15.33 |