メタデータ
| 項目 |
値 |
| Designation |
C/2017 F1 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-11-30T23:48:42.943680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:32Z |
| Obs used |
89 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
13.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-06-10.0000000 |
| e |
1.00410815 |
| q (au) |
4.499798 |
| a (au) |
-1095.333743 |
| i (deg) |
146.479803 |
| Ω (om, deg) |
158.739539 |
| ω (w, deg) |
64.812799 |
| M (ma, deg) |
-0.004731 |
等級
散乱 + 全体線形
$$
M_a = (6.511 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.511 |
| n |
6.000 |
| gf |
0.941 |
| gb |
-0.947 |
| k |
1.000 |
| δ90 |
9.286 |
| 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 |
22:16:37.09 |
-16:04:05.3 |
HIP 110046 |
10.98 |
| 2026-09-20 12:00 |
22:16:31.30 |
-16:04:41.2 |
HIP 110046 |
12.45 |
| 2026-09-21 00:00 |
22:16:25.54 |
-16:05:16.9 |
HIP 110046 |
13.93 |
| 2026-09-21 12:00 |
22:16:19.80 |
-16:05:52.3 |
HIP 110046 |
15.40 |
| 2026-09-22 00:00 |
22:16:14.09 |
-16:06:27.5 |
HIP 110046 |
16.87 |
| 2026-09-22 12:00 |
22:16:08.40 |
-16:07:02.5 |
HIP 110046 |
18.34 |
| 2026-09-23 00:00 |
22:16:02.74 |
-16:07:37.3 |
HIP 110004 |
19.25 |
| 2026-09-23 12:00 |
22:15:57.11 |
-16:08:11.9 |
HIP 110004 |
19.65 |
| 2026-09-24 00:00 |
22:15:51.51 |
-16:08:46.2 |
HIP 110004 |
20.14 |
| 2026-09-24 12:00 |
22:15:45.93 |
-16:09:20.3 |
HIP 110004 |
20.72 |
| 2026-09-25 00:00 |
22:15:40.38 |
-16:09:54.2 |
HIP 110004 |
21.39 |
| 2026-09-25 12:00 |
22:15:34.86 |
-16:10:27.8 |
HIP 110004 |
22.12 |
| 2026-09-26 00:00 |
22:15:29.36 |
-16:11:01.2 |
HIP 110004 |
22.92 |
| 2026-09-26 12:00 |
22:15:23.90 |
-16:11:34.4 |
HIP 110004 |
23.78 |
| 2026-09-27 00:00 |
22:15:18.46 |
-16:12:07.3 |
HIP 110004 |
24.68 |
| 2026-09-27 12:00 |
22:15:13.06 |
-16:12:40.0 |
HIP 109822 |
25.05 |
| 2026-09-28 00:00 |
22:15:07.68 |
-16:13:12.5 |
HIP 109822 |
25.16 |
| 2026-09-28 12:00 |
22:15:02.34 |
-16:13:44.7 |
HIP 109822 |
25.36 |
| 2026-09-29 00:00 |
22:14:57.02 |
-16:14:16.7 |
HIP 109822 |
25.62 |
| 2026-09-29 12:00 |
22:14:51.74 |
-16:14:48.4 |
HIP 109822 |
25.95 |
| 2026-09-30 00:00 |
22:14:46.49 |
-16:15:19.9 |
HIP 109822 |
26.35 |
| 2026-09-30 12:00 |
22:14:41.27 |
-16:15:51.1 |
HIP 109822 |
26.80 |
| 2026-10-01 00:00 |
22:14:36.08 |
-16:16:22.1 |
HIP 109822 |
27.31 |
| 2026-10-01 12:00 |
22:14:30.93 |
-16:16:52.9 |
HIP 109822 |
27.88 |
| 2026-10-02 00:00 |
22:14:25.81 |
-16:17:23.4 |
HIP 109685 |
27.50 |
| 2026-10-02 12:00 |
22:14:20.72 |
-16:17:53.6 |
HIP 109685 |
26.29 |
| 2026-10-03 00:00 |
22:14:15.67 |
-16:18:23.6 |
HIP 109685 |
25.11 |
| 2026-10-03 12:00 |
22:14:10.65 |
-16:18:53.3 |
HIP 109685 |
23.96 |
| 2026-10-04 00:00 |
22:14:05.66 |
-16:19:22.8 |
HIP 109685 |
22.82 |
| 2026-10-04 12:00 |
22:14:00.71 |
-16:19:52.0 |
HIP 109685 |
21.71 |
| 2026-10-05 00:00 |
22:13:55.80 |
-16:20:21.0 |
HIP 109685 |
20.64 |
| 2026-10-05 12:00 |
22:13:50.92 |
-16:20:49.6 |
HIP 109685 |
19.59 |
| 2026-10-06 00:00 |
22:13:46.07 |
-16:21:18.1 |
HIP 109685 |
18.58 |
| 2026-10-06 12:00 |
22:13:41.27 |
-16:21:46.2 |
HIP 109685 |
17.60 |
| 2026-10-07 00:00 |
22:13:36.50 |
-16:22:14.1 |
HIP 109685 |
16.67 |
| 2026-10-07 12:00 |
22:13:31.76 |
-16:22:41.8 |
HIP 109685 |
15.79 |
| 2026-10-08 00:00 |
22:13:27.07 |
-16:23:09.1 |
HIP 109685 |
14.97 |
| 2026-10-08 12:00 |
22:13:22.41 |
-16:23:36.2 |
HIP 109685 |
14.21 |
| 2026-10-09 00:00 |
22:13:17.79 |
-16:24:03.1 |
HIP 109685 |
13.52 |
| 2026-10-09 12:00 |
22:13:13.21 |
-16:24:29.6 |
HIP 109685 |
12.91 |
| 2026-10-10 00:00 |
22:13:08.67 |
-16:24:55.9 |
HIP 109685 |
12.39 |
| 2026-10-10 12:00 |
22:13:04.17 |
-16:25:21.9 |
HIP 109685 |
11.96 |
| 2026-10-11 00:00 |
22:12:59.71 |
-16:25:47.6 |
HIP 109685 |
11.64 |