メタデータ
| 項目 |
値 |
| Designation |
C/2006 WD4 (Lemmon) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-04-28T09:33:26.683200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:02Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
17.200 |
| 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) |
2007-01-20.0000000 |
| e |
0.99898724 |
| q (au) |
0.591244 |
| a (au) |
583.797842 |
| i (deg) |
152.704616 |
| Ω (om, deg) |
226.790541 |
| ω (w, deg) |
292.690897 |
| M (ma, deg) |
359.993125 |
等級
散乱 + 全体線形
$$
M_a = (13.923 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
13.923 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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 |
09:08:08.24 |
+45:04:34.5 |
HIP 44758 |
10.47 |
| 2026-03-26 12:00 |
09:08:05.45 |
+45:04:25.5 |
HIP 44758 |
10.16 |
| 2026-03-27 00:00 |
09:08:02.70 |
+45:04:16.2 |
HIP 44758 |
9.88 |
| 2026-03-27 12:00 |
09:07:59.97 |
+45:04:06.8 |
HIP 44758 |
9.61 |
| 2026-03-28 00:00 |
09:07:57.27 |
+45:03:57.1 |
HIP 44758 |
9.38 |
| 2026-03-28 12:00 |
09:07:54.60 |
+45:03:47.2 |
HIP 44758 |
9.17 |
| 2026-03-29 00:00 |
09:07:51.96 |
+45:03:37.2 |
HIP 44758 |
9.00 |
| 2026-03-29 12:00 |
09:07:49.36 |
+45:03:27.0 |
HIP 44758 |
8.85 |
| 2026-03-30 00:00 |
09:07:46.78 |
+45:03:16.5 |
HIP 44758 |
8.73 |
| 2026-03-30 12:00 |
09:07:44.23 |
+45:03:05.9 |
HIP 44758 |
8.64 |
| 2026-03-31 00:00 |
09:07:41.71 |
+45:02:55.1 |
HIP 44758 |
8.59 |
| 2026-03-31 12:00 |
09:07:39.23 |
+45:02:44.1 |
HIP 44758 |
8.57 |
| 2026-04-01 00:00 |
09:07:36.77 |
+45:02:32.9 |
HIP 44758 |
8.57 |
| 2026-04-01 12:00 |
09:07:34.35 |
+45:02:21.6 |
HIP 44758 |
8.61 |
| 2026-04-02 00:00 |
09:07:31.96 |
+45:02:10.0 |
HIP 44758 |
8.68 |
| 2026-04-02 12:00 |
09:07:29.59 |
+45:01:58.3 |
HIP 44758 |
8.78 |
| 2026-04-03 00:00 |
09:07:27.26 |
+45:01:46.4 |
HIP 44758 |
8.90 |
| 2026-04-03 12:00 |
09:07:24.97 |
+45:01:34.3 |
HIP 44758 |
9.05 |
| 2026-04-04 00:00 |
09:07:22.70 |
+45:01:22.0 |
HIP 44758 |
9.22 |
| 2026-04-04 12:00 |
09:07:20.46 |
+45:01:09.5 |
HIP 44758 |
9.41 |
| 2026-04-05 00:00 |
09:07:18.26 |
+45:00:56.9 |
HIP 44758 |
9.62 |
| 2026-04-05 12:00 |
09:07:16.09 |
+45:00:44.1 |
HIP 44758 |
9.85 |
| 2026-04-06 00:00 |
09:07:13.95 |
+45:00:31.1 |
HIP 44758 |
10.10 |
| 2026-04-06 12:00 |
09:07:11.84 |
+45:00:18.0 |
HIP 44758 |
10.36 |
| 2026-04-07 00:00 |
09:07:09.77 |
+45:00:04.6 |
HIP 44758 |
10.63 |
| 2026-04-07 12:00 |
09:07:07.72 |
+44:59:51.1 |
HIP 44758 |
10.92 |
| 2026-04-08 00:00 |
09:07:05.71 |
+44:59:37.5 |
HIP 44758 |
11.21 |
| 2026-04-08 12:00 |
09:07:03.74 |
+44:59:23.6 |
HIP 44671 |
11.34 |
| 2026-04-09 00:00 |
09:07:01.79 |
+44:59:09.6 |
HIP 44671 |
10.92 |
| 2026-04-09 12:00 |
09:06:59.88 |
+44:58:55.4 |
HIP 44671 |
10.51 |
| 2026-04-10 00:00 |
09:06:58.00 |
+44:58:41.1 |
HIP 44671 |
10.10 |
| 2026-04-10 12:00 |
09:06:56.16 |
+44:58:26.6 |
HIP 44671 |
9.70 |
| 2026-04-11 00:00 |
09:06:54.35 |
+44:58:12.0 |
HIP 44671 |
9.29 |
| 2026-04-11 12:00 |
09:06:52.57 |
+44:57:57.1 |
HIP 44671 |
8.89 |
| 2026-04-12 00:00 |
09:06:50.82 |
+44:57:42.1 |
HIP 44671 |
8.50 |
| 2026-04-12 12:00 |
09:06:49.11 |
+44:57:27.0 |
HIP 44671 |
8.10 |
| 2026-04-13 00:00 |
09:06:47.44 |
+44:57:11.7 |
HIP 44671 |
7.71 |
| 2026-04-13 12:00 |
09:06:45.79 |
+44:56:56.3 |
HIP 44671 |
7.32 |
| 2026-04-14 00:00 |
09:06:44.18 |
+44:56:40.7 |
HIP 44671 |
6.94 |
| 2026-04-14 12:00 |
09:06:42.61 |
+44:56:24.9 |
HIP 44671 |
6.56 |
| 2026-04-15 00:00 |
09:06:41.07 |
+44:56:09.0 |
HIP 44671 |
6.18 |
| 2026-04-15 12:00 |
09:06:39.56 |
+44:55:52.9 |
HIP 44671 |
5.81 |
| 2026-04-16 00:00 |
09:06:38.09 |
+44:55:36.7 |
HIP 44671 |
5.45 |