メタデータ
| 項目 |
値 |
| Designation |
C/2017 E5 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-06-10T21:21:43.948800Z |
| Orbit solution date (soln_date, UTC) |
2022-06-20T23:12:32Z |
| Obs used |
112 |
| NEO |
- |
| M1 |
15.900 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2017-01-12.0000000 |
| e |
0.99563963 |
| q (au) |
1.783311 |
| a (au) |
408.982042 |
| i (deg) |
122.637072 |
| Ω (om, deg) |
206.191666 |
| ω (w, deg) |
306.771175 |
| M (ma, deg) |
0.025634 |
等級
散乱 + 全体線形
$$
M_a = (17.408 + 3.382\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.408 |
| n |
3.382 |
| gf |
0.980 |
| gb |
-0.863 |
| k |
0.800 |
| 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) |
| 2026-09-20 00:00 |
09:19:19.21 |
+76:16:15.1 |
HIP 46139 |
20.24 |
| 2026-09-20 12:00 |
09:19:32.16 |
+76:16:50.2 |
HIP 46139 |
19.77 |
| 2026-09-21 00:00 |
09:19:45.03 |
+76:17:25.8 |
HIP 46139 |
19.35 |
| 2026-09-21 12:00 |
09:19:57.82 |
+76:18:01.7 |
HIP 46139 |
18.97 |
| 2026-09-22 00:00 |
09:20:10.52 |
+76:18:38.1 |
HIP 46139 |
18.65 |
| 2026-09-22 12:00 |
09:20:23.14 |
+76:19:15.0 |
HIP 46139 |
18.38 |
| 2026-09-23 00:00 |
09:20:35.66 |
+76:19:52.2 |
HIP 46139 |
18.17 |
| 2026-09-23 12:00 |
09:20:48.10 |
+76:20:29.9 |
HIP 46139 |
18.02 |
| 2026-09-24 00:00 |
09:21:00.45 |
+76:21:07.9 |
HIP 46139 |
17.92 |
| 2026-09-24 12:00 |
09:21:12.71 |
+76:21:46.4 |
HIP 46139 |
17.89 |
| 2026-09-25 00:00 |
09:21:24.88 |
+76:22:25.4 |
HIP 46139 |
17.93 |
| 2026-09-25 12:00 |
09:21:36.96 |
+76:23:04.7 |
HIP 46139 |
18.02 |
| 2026-09-26 00:00 |
09:21:48.94 |
+76:23:44.4 |
HIP 46139 |
18.18 |
| 2026-09-26 12:00 |
09:22:00.83 |
+76:24:24.6 |
HIP 46139 |
18.39 |
| 2026-09-27 00:00 |
09:22:12.63 |
+76:25:05.2 |
HIP 46139 |
18.66 |
| 2026-09-27 12:00 |
09:22:24.33 |
+76:25:46.2 |
HIP 46139 |
18.99 |
| 2026-09-28 00:00 |
09:22:35.93 |
+76:26:27.6 |
HIP 46139 |
19.37 |
| 2026-09-28 12:00 |
09:22:47.44 |
+76:27:09.4 |
HIP 45785 |
19.50 |
| 2026-09-29 00:00 |
09:22:58.85 |
+76:27:51.6 |
HIP 45785 |
19.22 |
| 2026-09-29 12:00 |
09:23:10.16 |
+76:28:34.2 |
HIP 45785 |
18.97 |
| 2026-09-30 00:00 |
09:23:21.37 |
+76:29:17.2 |
HIP 45785 |
18.76 |
| 2026-09-30 12:00 |
09:23:32.48 |
+76:30:00.6 |
HIP 45785 |
18.59 |
| 2026-10-01 00:00 |
09:23:43.48 |
+76:30:44.4 |
HIP 45785 |
18.46 |
| 2026-10-01 12:00 |
09:23:54.39 |
+76:31:28.6 |
HIP 45785 |
18.37 |
| 2026-10-02 00:00 |
09:24:05.19 |
+76:32:13.2 |
HIP 45785 |
18.32 |
| 2026-10-02 12:00 |
09:24:15.88 |
+76:32:58.3 |
HIP 45785 |
18.31 |
| 2026-10-03 00:00 |
09:24:26.47 |
+76:33:43.7 |
HIP 45785 |
18.35 |
| 2026-10-03 12:00 |
09:24:36.95 |
+76:34:29.5 |
HIP 45785 |
18.42 |
| 2026-10-04 00:00 |
09:24:47.33 |
+76:35:15.7 |
HIP 45785 |
18.54 |
| 2026-10-04 12:00 |
09:24:57.59 |
+76:36:02.2 |
HIP 45785 |
18.70 |
| 2026-10-05 00:00 |
09:25:07.74 |
+76:36:49.2 |
HIP 45785 |
18.89 |
| 2026-10-05 12:00 |
09:25:17.79 |
+76:37:36.6 |
HIP 45785 |
19.13 |
| 2026-10-06 00:00 |
09:25:27.71 |
+76:38:24.3 |
HIP 45785 |
19.40 |
| 2026-10-06 12:00 |
09:25:37.53 |
+76:39:12.4 |
HIP 45785 |
19.71 |
| 2026-10-07 00:00 |
09:25:47.23 |
+76:40:01.0 |
HIP 45785 |
20.05 |
| 2026-10-07 12:00 |
09:25:56.81 |
+76:40:49.8 |
HIP 45785 |
20.43 |
| 2026-10-08 00:00 |
09:26:06.28 |
+76:41:39.1 |
HIP 45785 |
20.84 |
| 2026-10-08 12:00 |
09:26:15.62 |
+76:42:28.7 |
HIP 45785 |
21.27 |
| 2026-10-09 00:00 |
09:26:24.85 |
+76:43:18.8 |
HIP 45785 |
21.74 |
| 2026-10-09 12:00 |
09:26:33.96 |
+76:44:09.1 |
HIP 45785 |
22.23 |
| 2026-10-10 00:00 |
09:26:42.94 |
+76:44:59.9 |
HIP 45785 |
22.74 |
| 2026-10-10 12:00 |
09:26:51.80 |
+76:45:51.0 |
HIP 46641 |
22.78 |
| 2026-10-11 00:00 |
09:27:00.54 |
+76:46:42.5 |
HIP 46641 |
21.79 |