C/2017 F1 (Lemmon)
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
$$
M_a = (6.500 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.500 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.663 |
| 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 |
22:21:29.88 |
-14:10:37.5 |
HIP 110333 |
15.49 |
| 2026-02-03 12:00 |
22:21:34.71 |
-14:10:16.4 |
HIP 110333 |
16.00 |
| 2026-02-04 00:00 |
22:21:39.56 |
-14:09:55.2 |
HIP 110333 |
16.60 |
| 2026-02-04 12:00 |
22:21:44.42 |
-14:09:33.9 |
HIP 110333 |
17.26 |
| 2026-02-05 00:00 |
22:21:49.29 |
-14:09:12.6 |
HIP 110333 |
17.98 |
| 2026-02-05 12:00 |
22:21:54.17 |
-14:08:51.3 |
HIP 110507 |
18.37 |
| 2026-02-06 00:00 |
22:21:59.07 |
-14:08:30.0 |
HIP 110507 |
17.30 |
| 2026-02-06 12:00 |
22:22:03.97 |
-14:08:08.7 |
HIP 110507 |
16.24 |
| 2026-02-07 00:00 |
22:22:08.89 |
-14:07:47.3 |
HIP 110507 |
15.21 |
| 2026-02-07 12:00 |
22:22:13.82 |
-14:07:25.9 |
HIP 110507 |
14.21 |
| 2026-02-08 00:00 |
22:22:18.76 |
-14:07:04.4 |
HIP 110507 |
13.26 |
| 2026-02-08 12:00 |
22:22:23.71 |
-14:06:43.0 |
HIP 110507 |
12.35 |
| 2026-02-09 00:00 |
22:22:28.67 |
-14:06:21.5 |
HIP 110507 |
11.50 |
| 2026-02-09 12:00 |
22:22:33.65 |
-14:06:00.1 |
HIP 110507 |
10.74 |
| 2026-02-10 00:00 |
22:22:38.63 |
-14:05:38.6 |
HIP 110507 |
10.07 |
| 2026-02-10 12:00 |
22:22:43.61 |
-14:05:17.1 |
HIP 110507 |
9.52 |
| 2026-02-11 00:00 |
22:22:48.61 |
-14:04:55.6 |
HIP 110507 |
9.11 |
| 2026-02-11 12:00 |
22:22:53.62 |
-14:04:34.1 |
HIP 110507 |
8.87 |
| 2026-02-12 00:00 |
22:22:58.63 |
-14:04:12.6 |
HIP 110507 |
8.80 |
| 2026-02-12 12:00 |
22:23:03.65 |
-14:03:51.1 |
HIP 110507 |
8.91 |
| 2026-02-13 00:00 |
22:23:08.68 |
-14:03:29.6 |
HIP 110507 |
9.20 |
| 2026-02-13 12:00 |
22:23:13.71 |
-14:03:08.1 |
HIP 110507 |
9.64 |
| 2026-02-14 00:00 |
22:23:18.75 |
-14:02:46.6 |
HIP 110507 |
10.23 |
| 2026-02-14 12:00 |
22:23:23.80 |
-14:02:25.1 |
HIP 110507 |
10.94 |
| 2026-02-15 00:00 |
22:23:28.85 |
-14:02:03.6 |
HIP 110507 |
11.74 |
| 2026-02-15 12:00 |
22:23:33.91 |
-14:01:42.1 |
HIP 110507 |
12.62 |
| 2026-02-16 00:00 |
22:23:38.97 |
-14:01:20.7 |
HIP 110507 |
13.56 |
| 2026-02-16 12:00 |
22:23:44.03 |
-14:00:59.3 |
HIP 110507 |
14.56 |
| 2026-02-17 00:00 |
22:23:49.10 |
-14:00:37.9 |
HIP 110507 |
15.59 |
| 2026-02-17 12:00 |
22:23:54.18 |
-14:00:16.5 |
HIP 110507 |
16.67 |
| 2026-02-18 00:00 |
22:23:59.25 |
-13:59:55.1 |
HIP 110663 |
15.75 |
| 2026-02-18 12:00 |
22:24:04.33 |
-13:59:33.8 |
HIP 110663 |
14.52 |
| 2026-02-19 00:00 |
22:24:09.41 |
-13:59:12.5 |
HIP 110663 |
13.30 |
| 2026-02-19 12:00 |
22:24:14.49 |
-13:58:51.3 |
HIP 110663 |
12.09 |
| 2026-02-20 00:00 |
22:24:19.58 |
-13:58:30.0 |
HIP 110663 |
10.91 |
| 2026-02-20 12:00 |
22:24:24.66 |
-13:58:08.9 |
HIP 110663 |
9.74 |
| 2026-02-21 00:00 |
22:24:29.75 |
-13:57:47.7 |
HIP 110663 |
8.61 |
| 2026-02-21 12:00 |
22:24:34.83 |
-13:57:26.6 |
HIP 110663 |
7.53 |
| 2026-02-22 00:00 |
22:24:39.92 |
-13:57:05.5 |
HIP 110663 |
6.51 |
| 2026-02-22 12:00 |
22:24:45.00 |
-13:56:44.5 |
HIP 110663 |
5.62 |
| 2026-02-23 00:00 |
22:24:50.08 |
-13:56:23.6 |
HIP 110663 |
4.89 |
| 2026-02-23 12:00 |
22:24:55.17 |
-13:56:02.7 |
HIP 110663 |
4.42 |
| 2026-02-24 00:00 |
22:25:00.25 |
-13:55:41.8 |
HIP 110663 |
4.30 |