メタデータ
| 項目 |
値 |
| Designation |
163P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2005-02-01T08:29:40.407360Z |
| Orbit solution date (soln_date, UTC) |
2021-09-22T15:34:14Z |
| Obs used |
355 |
| NEO |
- |
| M1 |
11.800 |
| K1 |
19.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2006-11-20.0000000 |
| e |
0.47602079 |
| q (au) |
1.928340 |
| a (au) |
3.680184 |
| i (deg) |
12.504636 |
| Ω (om, deg) |
103.347360 |
| ω (w, deg) |
348.053059 |
| M (ma, deg) |
91.670806 |
等級
散乱 + 全体線形
$$
M_a = (19.805 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
19.805 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.678 |
| 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) |
| 2026-05-12 00:00 |
02:11:14.89 |
+03:31:59.0 |
HIP 10242 |
8.60 |
| 2026-05-12 12:00 |
02:12:07.59 |
+03:36:48.3 |
HIP 10279 |
4.12 |
| 2026-05-13 00:00 |
02:13:00.35 |
+03:41:37.1 |
HIP 10279 |
11.74 |
| 2026-05-13 12:00 |
02:13:53.18 |
+03:46:25.2 |
HIP 10480 |
19.19 |
| 2026-05-14 00:00 |
02:14:46.06 |
+03:51:12.9 |
HIP 10480 |
5.42 |
| 2026-05-14 12:00 |
02:15:39.01 |
+03:55:59.9 |
HIP 10480 |
9.21 |
| 2026-05-15 00:00 |
02:16:32.01 |
+04:00:46.4 |
HIP 10480 |
23.13 |
| 2026-05-15 12:00 |
02:17:25.08 |
+04:05:32.2 |
HIP 10775 |
19.91 |
| 2026-05-16 00:00 |
02:18:18.20 |
+04:10:17.5 |
HIP 10775 |
5.85 |
| 2026-05-16 12:00 |
02:19:11.38 |
+04:15:02.2 |
HIP 10775 |
8.27 |
| 2026-05-17 00:00 |
02:20:04.62 |
+04:19:46.2 |
HIP 10775 |
22.35 |
| 2026-05-17 12:00 |
02:20:57.91 |
+04:24:29.7 |
HIP 11028 |
25.65 |
| 2026-05-18 00:00 |
02:21:51.27 |
+04:29:12.5 |
HIP 11028 |
15.77 |
| 2026-05-18 12:00 |
02:22:44.68 |
+04:33:54.7 |
HIP 11028 |
15.41 |
| 2026-05-19 00:00 |
02:23:38.15 |
+04:38:36.3 |
HIP 11182 |
14.77 |
| 2026-05-19 12:00 |
02:24:31.68 |
+04:43:17.2 |
HIP 11182 |
11.94 |
| 2026-05-20 00:00 |
02:25:25.26 |
+04:47:57.4 |
HIP 11251 |
16.07 |
| 2026-05-20 12:00 |
02:26:18.90 |
+04:52:37.1 |
HIP 11251 |
23.76 |
| 2026-05-21 00:00 |
02:27:12.60 |
+04:57:16.0 |
HIP 11452 |
32.45 |
| 2026-05-21 12:00 |
02:28:06.36 |
+05:01:54.3 |
HIP 11650 |
35.30 |
| 2026-05-22 00:00 |
02:29:00.17 |
+05:06:31.9 |
HIP 11650 |
21.18 |
| 2026-05-22 12:00 |
02:29:54.03 |
+05:11:08.8 |
HIP 11650 |
7.32 |
| 2026-05-23 00:00 |
02:30:47.96 |
+05:15:45.1 |
HIP 11650 |
7.81 |
| 2026-05-23 12:00 |
02:31:41.94 |
+05:20:20.7 |
HIP 11836 |
18.51 |
| 2026-05-24 00:00 |
02:32:35.97 |
+05:24:55.5 |
HIP 11836 |
12.77 |
| 2026-05-24 12:00 |
02:33:30.06 |
+05:29:29.7 |
HIP 11895 |
12.53 |
| 2026-05-25 00:00 |
02:34:24.21 |
+05:34:03.2 |
HIP 11983 |
7.65 |
| 2026-05-25 12:00 |
02:35:18.42 |
+05:38:36.0 |
HIP 12093 |
8.99 |
| 2026-05-26 00:00 |
02:36:12.68 |
+05:43:08.1 |
HIP 12093 |
9.06 |
| 2026-05-26 12:00 |
02:37:06.99 |
+05:47:39.4 |
HIP 12093 |
22.11 |
| 2026-05-27 00:00 |
02:38:01.36 |
+05:52:10.0 |
HIP 12320 |
25.63 |
| 2026-05-27 12:00 |
02:38:55.79 |
+05:56:40.0 |
HIP 12304 |
21.65 |
| 2026-05-28 00:00 |
02:39:50.28 |
+06:01:09.1 |
HIP 12447 |
8.41 |
| 2026-05-28 12:00 |
02:40:44.82 |
+06:05:37.6 |
HIP 12447 |
7.33 |
| 2026-05-29 00:00 |
02:41:39.42 |
+06:10:05.3 |
HIP 12545 |
11.29 |
| 2026-05-29 12:00 |
02:42:34.07 |
+06:14:32.2 |
HIP 12745 |
19.28 |
| 2026-05-30 00:00 |
02:43:28.78 |
+06:18:58.5 |
HIP 12745 |
6.63 |
| 2026-05-30 12:00 |
02:44:23.55 |
+06:23:23.9 |
HIP 12745 |
11.19 |
| 2026-05-31 00:00 |
02:45:18.37 |
+06:27:48.6 |
HIP 12745 |
24.83 |
| 2026-05-31 12:00 |
02:46:13.25 |
+06:32:12.5 |
HIP 13037 |
21.77 |
| 2026-06-01 00:00 |
02:47:08.19 |
+06:36:35.7 |
HIP 13037 |
7.84 |
| 2026-06-01 12:00 |
02:48:03.18 |
+06:40:58.1 |
HIP 13037 |
7.75 |
| 2026-06-02 00:00 |
02:48:58.23 |
+06:45:19.6 |
HIP 13037 |
21.69 |