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
$$
M_a = (8.961 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
8.961 |
| n |
2.000 |
| gf |
0.913 |
| 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) |
| 2026-09-20 00:00 |
04:15:33.75 |
-10:50:16.0 |
HIP 19804 |
19.68 |
| 2026-09-20 12:00 |
04:15:32.58 |
-10:50:50.5 |
HIP 19804 |
20.00 |
| 2026-09-21 00:00 |
04:15:31.37 |
-10:51:25.0 |
HIP 19804 |
20.32 |
| 2026-09-21 12:00 |
04:15:30.14 |
-10:51:59.4 |
HIP 19804 |
20.66 |
| 2026-09-22 00:00 |
04:15:28.87 |
-10:52:33.8 |
HIP 19804 |
21.01 |
| 2026-09-22 12:00 |
04:15:27.58 |
-10:53:08.2 |
HIP 19804 |
21.37 |
| 2026-09-23 00:00 |
04:15:26.26 |
-10:53:42.6 |
HIP 19804 |
21.74 |
| 2026-09-23 12:00 |
04:15:24.90 |
-10:54:16.9 |
HIP 19804 |
22.11 |
| 2026-09-24 00:00 |
04:15:23.52 |
-10:54:51.2 |
HIP 19804 |
22.50 |
| 2026-09-24 12:00 |
04:15:22.10 |
-10:55:25.4 |
HIP 19804 |
22.90 |
| 2026-09-25 00:00 |
04:15:20.66 |
-10:55:59.6 |
HIP 19804 |
23.31 |
| 2026-09-25 12:00 |
04:15:19.19 |
-10:56:33.8 |
HIP 19804 |
23.72 |
| 2026-09-26 00:00 |
04:15:17.69 |
-10:57:08.0 |
HIP 19804 |
24.15 |
| 2026-09-26 12:00 |
04:15:16.16 |
-10:57:42.1 |
HIP 19804 |
24.58 |
| 2026-09-27 00:00 |
04:15:14.60 |
-10:58:16.1 |
HIP 19804 |
25.02 |
| 2026-09-27 12:00 |
04:15:13.01 |
-10:58:50.1 |
HIP 19804 |
25.47 |
| 2026-09-28 00:00 |
04:15:11.39 |
-10:59:24.1 |
HIP 19804 |
25.93 |
| 2026-09-28 12:00 |
04:15:09.74 |
-10:59:58.0 |
HIP 19804 |
26.40 |
| 2026-09-29 00:00 |
04:15:08.07 |
-11:00:31.8 |
HIP 19804 |
26.87 |
| 2026-09-29 12:00 |
04:15:06.36 |
-11:01:05.6 |
HIP 19804 |
27.35 |
| 2026-09-30 00:00 |
04:15:04.63 |
-11:01:39.3 |
HIP 19804 |
27.84 |
| 2026-09-30 12:00 |
04:15:02.87 |
-11:02:13.0 |
HIP 19804 |
28.34 |
| 2026-10-01 00:00 |
04:15:01.08 |
-11:02:46.6 |
HIP 19804 |
28.84 |
| 2026-10-01 12:00 |
04:14:59.26 |
-11:03:20.1 |
HIP 19804 |
29.35 |
| 2026-10-02 00:00 |
04:14:57.42 |
-11:03:53.6 |
HIP 19804 |
29.86 |
| 2026-10-02 12:00 |
04:14:55.54 |
-11:04:27.0 |
HIP 19678 |
29.40 |
| 2026-10-03 00:00 |
04:14:53.64 |
-11:05:00.3 |
HIP 19678 |
28.88 |
| 2026-10-03 12:00 |
04:14:51.72 |
-11:05:33.5 |
HIP 19678 |
28.37 |
| 2026-10-04 00:00 |
04:14:49.76 |
-11:06:06.7 |
HIP 19678 |
27.86 |
| 2026-10-04 12:00 |
04:14:47.78 |
-11:06:39.8 |
HIP 19678 |
27.35 |
| 2026-10-05 00:00 |
04:14:45.76 |
-11:07:12.8 |
HIP 19678 |
26.85 |
| 2026-10-05 12:00 |
04:14:43.73 |
-11:07:45.7 |
HIP 19678 |
26.35 |
| 2026-10-06 00:00 |
04:14:41.66 |
-11:08:18.5 |
HIP 19678 |
25.86 |
| 2026-10-06 12:00 |
04:14:39.57 |
-11:08:51.3 |
HIP 19678 |
25.37 |
| 2026-10-07 00:00 |
04:14:37.45 |
-11:09:23.9 |
HIP 19678 |
24.89 |
| 2026-10-07 12:00 |
04:14:35.30 |
-11:09:56.4 |
HIP 19678 |
24.41 |
| 2026-10-08 00:00 |
04:14:33.13 |
-11:10:28.9 |
HIP 19678 |
23.95 |
| 2026-10-08 12:00 |
04:14:30.93 |
-11:11:01.2 |
HIP 19678 |
23.49 |
| 2026-10-09 00:00 |
04:14:28.71 |
-11:11:33.5 |
HIP 19678 |
23.04 |
| 2026-10-09 12:00 |
04:14:26.46 |
-11:12:05.6 |
HIP 19678 |
22.60 |
| 2026-10-10 00:00 |
04:14:24.19 |
-11:12:37.6 |
HIP 19678 |
22.18 |
| 2026-10-10 12:00 |
04:14:21.88 |
-11:13:09.5 |
HIP 19678 |
21.77 |
| 2026-10-11 00:00 |
04:14:19.56 |
-11:13:41.3 |
HIP 19678 |
21.37 |