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 |
1.000 |
| 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) |
| 2026-03-26 00:00 |
08:23:20.08 |
+79:10:48.7 |
HIP 41925 |
26.84 |
| 2026-03-26 12:00 |
08:23:05.75 |
+79:09:57.5 |
HIP 40527 |
27.16 |
| 2026-03-27 00:00 |
08:22:51.66 |
+79:09:05.9 |
HIP 40527 |
27.39 |
| 2026-03-27 12:00 |
08:22:37.81 |
+79:08:14.0 |
HIP 40527 |
27.66 |
| 2026-03-28 00:00 |
08:22:24.20 |
+79:07:21.9 |
HIP 40210 |
27.85 |
| 2026-03-28 12:00 |
08:22:10.84 |
+79:06:29.4 |
HIP 40210 |
27.46 |
| 2026-03-29 00:00 |
08:21:57.71 |
+79:05:36.5 |
HIP 40210 |
27.11 |
| 2026-03-29 12:00 |
08:21:44.83 |
+79:04:43.4 |
HIP 40210 |
26.81 |
| 2026-03-30 00:00 |
08:21:32.19 |
+79:03:50.0 |
HIP 40210 |
26.57 |
| 2026-03-30 12:00 |
08:21:19.79 |
+79:02:56.3 |
HIP 40210 |
26.38 |
| 2026-03-31 00:00 |
08:21:07.63 |
+79:02:02.3 |
HIP 40210 |
26.24 |
| 2026-03-31 12:00 |
08:20:55.70 |
+79:01:08.0 |
HIP 40210 |
26.15 |
| 2026-04-01 00:00 |
08:20:44.02 |
+79:00:13.5 |
HIP 40210 |
26.12 |
| 2026-04-01 12:00 |
08:20:32.58 |
+78:59:18.6 |
HIP 40210 |
26.14 |
| 2026-04-02 00:00 |
08:20:21.38 |
+78:58:23.6 |
HIP 40210 |
26.22 |
| 2026-04-02 12:00 |
08:20:10.41 |
+78:57:28.2 |
HIP 40210 |
26.35 |
| 2026-04-03 00:00 |
08:19:59.69 |
+78:56:32.6 |
HIP 40210 |
26.53 |
| 2026-04-03 12:00 |
08:19:49.20 |
+78:55:36.8 |
HIP 40210 |
26.76 |
| 2026-04-04 00:00 |
08:19:38.95 |
+78:54:40.7 |
HIP 40032 |
26.31 |
| 2026-04-04 12:00 |
08:19:28.93 |
+78:53:44.4 |
HIP 40032 |
25.75 |
| 2026-04-05 00:00 |
08:19:19.15 |
+78:52:47.9 |
HIP 40032 |
25.23 |
| 2026-04-05 12:00 |
08:19:09.61 |
+78:51:51.1 |
HIP 40032 |
24.76 |
| 2026-04-06 00:00 |
08:19:00.30 |
+78:50:54.2 |
HIP 40032 |
24.33 |
| 2026-04-06 12:00 |
08:18:51.23 |
+78:49:57.0 |
HIP 40032 |
23.95 |
| 2026-04-07 00:00 |
08:18:42.39 |
+78:48:59.6 |
HIP 40032 |
23.62 |
| 2026-04-07 12:00 |
08:18:33.79 |
+78:48:02.0 |
HIP 40032 |
23.35 |
| 2026-04-08 00:00 |
08:18:25.42 |
+78:47:04.2 |
HIP 40032 |
23.13 |
| 2026-04-08 12:00 |
08:18:17.28 |
+78:46:06.2 |
HIP 40032 |
22.97 |
| 2026-04-09 00:00 |
08:18:09.37 |
+78:45:08.1 |
HIP 40032 |
22.86 |
| 2026-04-09 12:00 |
08:18:01.70 |
+78:44:09.7 |
HIP 40032 |
22.81 |
| 2026-04-10 00:00 |
08:17:54.25 |
+78:43:11.2 |
HIP 40032 |
22.82 |
| 2026-04-10 12:00 |
08:17:47.04 |
+78:42:12.5 |
HIP 40032 |
22.89 |
| 2026-04-11 00:00 |
08:17:40.06 |
+78:41:13.7 |
HIP 40032 |
23.01 |
| 2026-04-11 12:00 |
08:17:33.30 |
+78:40:14.7 |
HIP 40032 |
23.20 |
| 2026-04-12 00:00 |
08:17:26.77 |
+78:39:15.5 |
HIP 40032 |
23.43 |
| 2026-04-12 12:00 |
08:17:20.48 |
+78:38:16.2 |
HIP 40032 |
23.72 |
| 2026-04-13 00:00 |
08:17:14.40 |
+78:37:16.8 |
HIP 40032 |
24.06 |
| 2026-04-13 12:00 |
08:17:08.56 |
+78:36:17.2 |
HIP 40032 |
24.45 |
| 2026-04-14 00:00 |
08:17:02.94 |
+78:35:17.5 |
HIP 40032 |
24.88 |
| 2026-04-14 12:00 |
08:16:57.54 |
+78:34:17.7 |
HIP 40095 |
25.16 |
| 2026-04-15 00:00 |
08:16:52.37 |
+78:33:17.7 |
HIP 40095 |
24.26 |
| 2026-04-15 12:00 |
08:16:47.42 |
+78:32:17.6 |
HIP 40095 |
23.37 |
| 2026-04-16 00:00 |
08:16:42.69 |
+78:31:17.5 |
HIP 40095 |
22.50 |