メタデータ
| 項目 |
値 |
| Designation |
166P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2002-05-20T20:10:57.889920Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:43Z |
| Obs used |
168 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
8.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2003-06-29.0000000 |
| e |
0.38310092 |
| q (au) |
8.564302 |
| a (au) |
13.882826 |
| i (deg) |
15.368401 |
| Ω (om, deg) |
64.488838 |
| ω (w, deg) |
321.878902 |
| M (ma, deg) |
7.700866 |
等級
散乱 + 全体線形
$$
M_a = (6.233 + 3.388\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.233 |
| n |
3.388 |
| gf |
0.990 |
| gb |
-1.000 |
| k |
1.000 |
| 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) |
| 2026-06-01 00:00 |
13:26:33.83 |
+02:45:46.7 |
HIP 65538 |
10.36 |
| 2026-06-01 12:00 |
13:26:30.76 |
+02:45:46.8 |
HIP 65538 |
9.90 |
| 2026-06-02 00:00 |
13:26:27.72 |
+02:45:46.5 |
HIP 65538 |
9.49 |
| 2026-06-02 12:00 |
13:26:24.73 |
+02:45:45.9 |
HIP 65538 |
9.13 |
| 2026-06-03 00:00 |
13:26:21.77 |
+02:45:45.0 |
HIP 65538 |
8.83 |
| 2026-06-03 12:00 |
13:26:18.85 |
+02:45:43.8 |
HIP 65538 |
8.59 |
| 2026-06-04 00:00 |
13:26:15.97 |
+02:45:42.2 |
HIP 65538 |
8.42 |
| 2026-06-04 12:00 |
13:26:13.14 |
+02:45:40.3 |
HIP 65538 |
8.31 |
| 2026-06-05 00:00 |
13:26:10.34 |
+02:45:38.1 |
HIP 65538 |
8.27 |
| 2026-06-05 12:00 |
13:26:07.58 |
+02:45:35.6 |
HIP 65538 |
8.29 |
| 2026-06-06 00:00 |
13:26:04.86 |
+02:45:32.7 |
HIP 65538 |
8.38 |
| 2026-06-06 12:00 |
13:26:02.19 |
+02:45:29.5 |
HIP 65538 |
8.52 |
| 2026-06-07 00:00 |
13:25:59.55 |
+02:45:26.0 |
HIP 65538 |
8.71 |
| 2026-06-07 12:00 |
13:25:56.96 |
+02:45:22.2 |
HIP 65538 |
8.95 |
| 2026-06-08 00:00 |
13:25:54.41 |
+02:45:18.0 |
HIP 65538 |
9.24 |
| 2026-06-08 12:00 |
13:25:51.90 |
+02:45:13.5 |
HIP 65538 |
9.55 |
| 2026-06-09 00:00 |
13:25:49.43 |
+02:45:08.7 |
HIP 65538 |
9.90 |
| 2026-06-09 12:00 |
13:25:47.00 |
+02:45:03.6 |
HIP 65538 |
10.27 |
| 2026-06-10 00:00 |
13:25:44.61 |
+02:44:58.1 |
HIP 65538 |
10.66 |
| 2026-06-10 12:00 |
13:25:42.27 |
+02:44:52.3 |
HIP 65538 |
11.07 |
| 2026-06-11 00:00 |
13:25:39.97 |
+02:44:46.2 |
HIP 65538 |
11.50 |
| 2026-06-11 12:00 |
13:25:37.72 |
+02:44:39.7 |
HIP 65538 |
11.93 |
| 2026-06-12 00:00 |
13:25:35.50 |
+02:44:32.9 |
HIP 65538 |
12.37 |
| 2026-06-12 12:00 |
13:25:33.34 |
+02:44:25.8 |
HIP 65538 |
12.82 |
| 2026-06-13 00:00 |
13:25:31.21 |
+02:44:18.4 |
HIP 65538 |
13.28 |
| 2026-06-13 12:00 |
13:25:29.13 |
+02:44:10.6 |
HIP 65538 |
13.73 |
| 2026-06-14 00:00 |
13:25:27.09 |
+02:44:02.5 |
HIP 65538 |
14.19 |
| 2026-06-14 12:00 |
13:25:25.10 |
+02:43:54.1 |
HIP 65538 |
14.65 |
| 2026-06-15 00:00 |
13:25:23.15 |
+02:43:45.4 |
HIP 65538 |
15.11 |
| 2026-06-15 12:00 |
13:25:21.24 |
+02:43:36.3 |
HIP 65538 |
15.56 |
| 2026-06-16 00:00 |
13:25:19.38 |
+02:43:26.9 |
HIP 65538 |
16.01 |
| 2026-06-16 12:00 |
13:25:17.57 |
+02:43:17.2 |
HIP 65538 |
16.46 |
| 2026-06-17 00:00 |
13:25:15.80 |
+02:43:07.2 |
HIP 65538 |
16.91 |
| 2026-06-17 12:00 |
13:25:14.08 |
+02:42:56.8 |
HIP 65538 |
17.35 |
| 2026-06-18 00:00 |
13:25:12.40 |
+02:42:46.1 |
HIP 65538 |
17.79 |
| 2026-06-18 12:00 |
13:25:10.76 |
+02:42:35.1 |
HIP 65538 |
18.23 |
| 2026-06-19 00:00 |
13:25:09.18 |
+02:42:23.8 |
HIP 65538 |
18.65 |
| 2026-06-19 12:00 |
13:25:07.63 |
+02:42:12.2 |
HIP 65538 |
19.08 |
| 2026-06-20 00:00 |
13:25:06.14 |
+02:42:00.2 |
HIP 65538 |
19.49 |
| 2026-06-20 12:00 |
13:25:04.69 |
+02:41:47.9 |
HIP 65538 |
19.91 |
| 2026-06-21 00:00 |
13:25:03.28 |
+02:41:35.3 |
HIP 65538 |
20.31 |
| 2026-06-21 12:00 |
13:25:01.93 |
+02:41:22.4 |
HIP 65355 |
20.36 |
| 2026-06-22 00:00 |
13:25:00.62 |
+02:41:09.2 |
HIP 65355 |
20.06 |