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) |
| 2026-06-01 00:00 |
22:34:17.74 |
-13:42:18.8 |
HIP 111234 |
31.84 |
| 2026-06-01 12:00 |
22:34:16.83 |
-13:42:39.4 |
HIP 111234 |
31.69 |
| 2026-06-02 00:00 |
22:34:15.87 |
-13:43:00.2 |
HIP 111234 |
31.54 |
| 2026-06-02 12:00 |
22:34:14.86 |
-13:43:21.3 |
HIP 111234 |
31.39 |
| 2026-06-03 00:00 |
22:34:13.81 |
-13:43:42.7 |
HIP 111234 |
31.22 |
| 2026-06-03 12:00 |
22:34:12.70 |
-13:44:04.4 |
HIP 111234 |
31.06 |
| 2026-06-04 00:00 |
22:34:11.55 |
-13:44:26.4 |
HIP 111234 |
30.89 |
| 2026-06-04 12:00 |
22:34:10.35 |
-13:44:48.7 |
HIP 111234 |
30.71 |
| 2026-06-05 00:00 |
22:34:09.10 |
-13:45:11.2 |
HIP 111234 |
30.54 |
| 2026-06-05 12:00 |
22:34:07.81 |
-13:45:34.0 |
HIP 111234 |
30.36 |
| 2026-06-06 00:00 |
22:34:06.46 |
-13:45:57.1 |
HIP 111234 |
30.17 |
| 2026-06-06 12:00 |
22:34:05.07 |
-13:46:20.5 |
HIP 111234 |
29.99 |
| 2026-06-07 00:00 |
22:34:03.63 |
-13:46:44.1 |
HIP 111234 |
29.80 |
| 2026-06-07 12:00 |
22:34:02.14 |
-13:47:08.1 |
HIP 111234 |
29.61 |
| 2026-06-08 00:00 |
22:34:00.60 |
-13:47:32.3 |
HIP 111234 |
29.43 |
| 2026-06-08 12:00 |
22:33:59.02 |
-13:47:56.8 |
HIP 111234 |
29.24 |
| 2026-06-09 00:00 |
22:33:57.38 |
-13:48:21.5 |
HIP 111234 |
29.05 |
| 2026-06-09 12:00 |
22:33:55.70 |
-13:48:46.5 |
HIP 111234 |
28.87 |
| 2026-06-10 00:00 |
22:33:53.97 |
-13:49:11.9 |
HIP 111234 |
28.69 |
| 2026-06-10 12:00 |
22:33:52.19 |
-13:49:37.4 |
HIP 111234 |
28.51 |
| 2026-06-11 00:00 |
22:33:50.37 |
-13:50:03.3 |
HIP 111234 |
28.33 |
| 2026-06-11 12:00 |
22:33:48.49 |
-13:50:29.4 |
HIP 111234 |
28.17 |
| 2026-06-12 00:00 |
22:33:46.57 |
-13:50:55.8 |
HIP 111234 |
28.00 |
| 2026-06-12 12:00 |
22:33:44.60 |
-13:51:22.5 |
HIP 111234 |
27.84 |
| 2026-06-13 00:00 |
22:33:42.58 |
-13:51:49.4 |
HIP 111234 |
27.69 |
| 2026-06-13 12:00 |
22:33:40.51 |
-13:52:16.6 |
HIP 111234 |
27.55 |
| 2026-06-14 00:00 |
22:33:38.40 |
-13:52:44.1 |
HIP 111234 |
27.42 |
| 2026-06-14 12:00 |
22:33:36.23 |
-13:53:11.9 |
HIP 111234 |
27.30 |
| 2026-06-15 00:00 |
22:33:34.02 |
-13:53:39.9 |
HIP 111234 |
27.19 |
| 2026-06-15 12:00 |
22:33:31.76 |
-13:54:08.1 |
HIP 111234 |
27.09 |
| 2026-06-16 00:00 |
22:33:29.46 |
-13:54:36.7 |
HIP 111234 |
27.01 |
| 2026-06-16 12:00 |
22:33:27.10 |
-13:55:05.5 |
HIP 111234 |
26.94 |
| 2026-06-17 00:00 |
22:33:24.70 |
-13:55:34.5 |
HIP 111234 |
26.89 |
| 2026-06-17 12:00 |
22:33:22.26 |
-13:56:03.8 |
HIP 111194 |
26.83 |
| 2026-06-18 00:00 |
22:33:19.76 |
-13:56:33.4 |
HIP 111194 |
26.39 |
| 2026-06-18 12:00 |
22:33:17.22 |
-13:57:03.2 |
HIP 111194 |
25.96 |
| 2026-06-19 00:00 |
22:33:14.63 |
-13:57:33.3 |
HIP 111194 |
25.53 |
| 2026-06-19 12:00 |
22:33:11.99 |
-13:58:03.7 |
HIP 111194 |
25.11 |
| 2026-06-20 00:00 |
22:33:09.31 |
-13:58:34.2 |
HIP 111194 |
24.71 |
| 2026-06-20 12:00 |
22:33:06.58 |
-13:59:05.1 |
HIP 111194 |
24.31 |
| 2026-06-21 00:00 |
22:33:03.80 |
-13:59:36.2 |
HIP 111194 |
23.94 |
| 2026-06-21 12:00 |
22:33:00.98 |
-14:00:07.5 |
HIP 111194 |
23.58 |
| 2026-06-22 00:00 |
22:32:58.11 |
-14:00:39.1 |
HIP 111194 |
23.23 |