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) |
| 2026-07-29 00:00 |
22:27:32.36 |
-14:48:41.2 |
HIP 110723 |
23.88 |
| 2026-07-29 12:00 |
22:27:26.68 |
-14:49:25.4 |
HIP 110723 |
22.34 |
| 2026-07-30 00:00 |
22:27:20.98 |
-14:50:09.6 |
HIP 110723 |
20.79 |
| 2026-07-30 12:00 |
22:27:15.25 |
-14:50:53.9 |
HIP 110723 |
19.24 |
| 2026-07-31 00:00 |
22:27:09.50 |
-14:51:38.3 |
HIP 110723 |
17.69 |
| 2026-07-31 12:00 |
22:27:03.73 |
-14:52:22.7 |
HIP 110723 |
16.14 |
| 2026-08-01 00:00 |
22:26:57.93 |
-14:53:07.2 |
HIP 110723 |
14.58 |
| 2026-08-01 12:00 |
22:26:52.11 |
-14:53:51.7 |
HIP 110723 |
13.03 |
| 2026-08-02 00:00 |
22:26:46.26 |
-14:54:36.3 |
HIP 110723 |
11.48 |
| 2026-08-02 12:00 |
22:26:40.39 |
-14:55:21.0 |
HIP 110723 |
9.95 |
| 2026-08-03 00:00 |
22:26:34.50 |
-14:56:05.7 |
HIP 110723 |
8.43 |
| 2026-08-03 12:00 |
22:26:28.59 |
-14:56:50.5 |
HIP 110723 |
6.95 |
| 2026-08-04 00:00 |
22:26:22.66 |
-14:57:35.3 |
HIP 110723 |
5.53 |
| 2026-08-04 12:00 |
22:26:16.70 |
-14:58:20.1 |
HIP 110723 |
4.25 |
| 2026-08-05 00:00 |
22:26:10.73 |
-14:59:05.0 |
HIP 110723 |
3.29 |
| 2026-08-05 12:00 |
22:26:04.73 |
-14:59:49.9 |
HIP 110723 |
2.97 |
| 2026-08-06 00:00 |
22:25:58.72 |
-15:00:34.9 |
HIP 110723 |
3.49 |
| 2026-08-06 12:00 |
22:25:52.69 |
-15:01:19.9 |
HIP 110723 |
4.57 |
| 2026-08-07 00:00 |
22:25:46.63 |
-15:02:04.9 |
HIP 110723 |
5.92 |
| 2026-08-07 12:00 |
22:25:40.56 |
-15:02:49.9 |
HIP 110723 |
7.39 |
| 2026-08-08 00:00 |
22:25:34.47 |
-15:03:35.0 |
HIP 110723 |
8.92 |
| 2026-08-08 12:00 |
22:25:28.37 |
-15:04:20.1 |
HIP 110723 |
10.49 |
| 2026-08-09 00:00 |
22:25:22.24 |
-15:05:05.2 |
HIP 110723 |
12.09 |
| 2026-08-09 12:00 |
22:25:16.10 |
-15:05:50.3 |
HIP 110723 |
13.71 |
| 2026-08-10 00:00 |
22:25:09.95 |
-15:06:35.4 |
HIP 110723 |
15.34 |
| 2026-08-10 12:00 |
22:25:03.78 |
-15:07:20.6 |
HIP 110723 |
16.98 |
| 2026-08-11 00:00 |
22:24:57.59 |
-15:08:05.7 |
HIP 110701 |
17.44 |
| 2026-08-11 12:00 |
22:24:51.39 |
-15:08:50.8 |
HIP 110701 |
17.90 |
| 2026-08-12 00:00 |
22:24:45.17 |
-15:09:36.0 |
HIP 110701 |
18.51 |
| 2026-08-12 12:00 |
22:24:38.94 |
-15:10:21.1 |
HIP 110701 |
19.24 |
| 2026-08-13 00:00 |
22:24:32.70 |
-15:11:06.2 |
HIP 110701 |
20.10 |
| 2026-08-13 12:00 |
22:24:26.44 |
-15:11:51.3 |
HIP 110514 |
18.83 |
| 2026-08-14 00:00 |
22:24:20.17 |
-15:12:36.4 |
HIP 110514 |
17.14 |
| 2026-08-14 12:00 |
22:24:13.90 |
-15:13:21.4 |
HIP 110514 |
15.45 |
| 2026-08-15 00:00 |
22:24:07.61 |
-15:14:06.5 |
HIP 110514 |
13.75 |
| 2026-08-15 12:00 |
22:24:01.30 |
-15:14:51.5 |
HIP 110514 |
12.06 |
| 2026-08-16 00:00 |
22:23:54.99 |
-15:15:36.5 |
HIP 110514 |
10.36 |
| 2026-08-16 12:00 |
22:23:48.67 |
-15:16:21.4 |
HIP 110514 |
8.67 |
| 2026-08-17 00:00 |
22:23:42.34 |
-15:17:06.4 |
HIP 110514 |
6.97 |
| 2026-08-17 12:00 |
22:23:36.00 |
-15:17:51.3 |
HIP 110514 |
5.27 |
| 2026-08-18 00:00 |
22:23:29.66 |
-15:18:36.1 |
HIP 110514 |
3.57 |
| 2026-08-18 12:00 |
22:23:23.30 |
-15:19:20.9 |
HIP 110514 |
1.87 |
| 2026-08-19 00:00 |
22:23:16.94 |
-15:20:05.6 |
HIP 110514 |
0.29 |