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
$$
M_a = (6.234 + 3.388\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.234 |
| n |
3.388 |
| gf |
0.964 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.999 |
| 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) |
| 2026-05-12 00:00 |
13:29:05.21 |
+02:41:22.5 |
HIP 65852 |
13.30 |
| 2026-05-12 12:00 |
13:29:00.84 |
+02:41:35.2 |
HIP 65852 |
14.29 |
| 2026-05-13 00:00 |
13:28:56.49 |
+02:41:47.5 |
HIP 65852 |
15.29 |
| 2026-05-13 12:00 |
13:28:52.16 |
+02:41:59.6 |
HIP 65852 |
16.29 |
| 2026-05-14 00:00 |
13:28:47.86 |
+02:42:11.3 |
HIP 65852 |
17.31 |
| 2026-05-14 12:00 |
13:28:43.59 |
+02:42:22.8 |
HIP 65852 |
18.32 |
| 2026-05-15 00:00 |
13:28:39.35 |
+02:42:33.9 |
HIP 65852 |
19.34 |
| 2026-05-15 12:00 |
13:28:35.13 |
+02:42:44.8 |
HIP 65852 |
20.36 |
| 2026-05-16 00:00 |
13:28:30.94 |
+02:42:55.3 |
HIP 65852 |
21.37 |
| 2026-05-16 12:00 |
13:28:26.78 |
+02:43:05.6 |
HIP 65654 |
21.82 |
| 2026-05-17 00:00 |
13:28:22.65 |
+02:43:15.5 |
HIP 65654 |
21.14 |
| 2026-05-17 12:00 |
13:28:18.55 |
+02:43:25.1 |
HIP 65654 |
20.50 |
| 2026-05-18 00:00 |
13:28:14.48 |
+02:43:34.4 |
HIP 65654 |
19.89 |
| 2026-05-18 12:00 |
13:28:10.43 |
+02:43:43.4 |
HIP 65654 |
19.33 |
| 2026-05-19 00:00 |
13:28:06.42 |
+02:43:52.1 |
HIP 65654 |
18.82 |
| 2026-05-19 12:00 |
13:28:02.44 |
+02:44:00.5 |
HIP 65654 |
18.36 |
| 2026-05-20 00:00 |
13:27:58.49 |
+02:44:08.6 |
HIP 65654 |
17.94 |
| 2026-05-20 12:00 |
13:27:54.57 |
+02:44:16.3 |
HIP 65654 |
17.58 |
| 2026-05-21 00:00 |
13:27:50.68 |
+02:44:23.8 |
HIP 65654 |
17.28 |
| 2026-05-21 12:00 |
13:27:46.82 |
+02:44:30.9 |
HIP 65654 |
17.03 |
| 2026-05-22 00:00 |
13:27:43.00 |
+02:44:37.7 |
HIP 65654 |
16.84 |
| 2026-05-22 12:00 |
13:27:39.21 |
+02:44:44.2 |
HIP 65654 |
16.71 |
| 2026-05-23 00:00 |
13:27:35.45 |
+02:44:50.4 |
HIP 65654 |
16.64 |
| 2026-05-23 12:00 |
13:27:31.73 |
+02:44:56.2 |
HIP 65654 |
16.63 |
| 2026-05-24 00:00 |
13:27:28.04 |
+02:45:01.7 |
HIP 65654 |
16.67 |
| 2026-05-24 12:00 |
13:27:24.38 |
+02:45:07.0 |
HIP 65654 |
16.77 |
| 2026-05-25 00:00 |
13:27:20.76 |
+02:45:11.9 |
HIP 65654 |
16.92 |
| 2026-05-25 12:00 |
13:27:17.18 |
+02:45:16.4 |
HIP 65654 |
17.11 |
| 2026-05-26 00:00 |
13:27:13.63 |
+02:45:20.7 |
HIP 65654 |
17.36 |
| 2026-05-26 12:00 |
13:27:10.11 |
+02:45:24.6 |
HIP 65654 |
17.64 |
| 2026-05-27 00:00 |
13:27:06.63 |
+02:45:28.2 |
HIP 65538 |
16.88 |
| 2026-05-27 12:00 |
13:27:03.18 |
+02:45:31.5 |
HIP 65538 |
16.11 |
| 2026-05-28 00:00 |
13:26:59.77 |
+02:45:34.5 |
HIP 65538 |
15.36 |
| 2026-05-28 12:00 |
13:26:56.40 |
+02:45:37.2 |
HIP 65538 |
14.64 |
| 2026-05-29 00:00 |
13:26:53.06 |
+02:45:39.5 |
HIP 65538 |
13.93 |
| 2026-05-29 12:00 |
13:26:49.76 |
+02:45:41.5 |
HIP 65538 |
13.26 |
| 2026-05-30 00:00 |
13:26:46.50 |
+02:45:43.2 |
HIP 65538 |
12.61 |
| 2026-05-30 12:00 |
13:26:43.28 |
+02:45:44.5 |
HIP 65538 |
11.99 |
| 2026-05-31 00:00 |
13:26:40.09 |
+02:45:45.6 |
HIP 65538 |
11.41 |
| 2026-05-31 12:00 |
13:26:36.94 |
+02:45:46.3 |
HIP 65538 |
10.86 |
| 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 |