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 |
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) |
| 2026-07-29 00:00 |
04:38:31.25 |
+13:13:57.2 |
HIP 21672 |
16.51 |
| 2026-07-29 12:00 |
04:39:30.56 |
+13:16:15.6 |
HIP 21703 |
8.97 |
| 2026-07-30 00:00 |
04:40:29.86 |
+13:18:32.7 |
HIP 21703 |
17.13 |
| 2026-07-30 12:00 |
04:41:29.18 |
+13:20:48.5 |
HIP 21703 |
30.55 |
| 2026-07-31 00:00 |
04:42:28.50 |
+13:23:03.1 |
HIP 22021 |
33.06 |
| 2026-07-31 12:00 |
04:43:27.82 |
+13:25:16.4 |
HIP 22021 |
27.24 |
| 2026-08-01 00:00 |
04:44:27.15 |
+13:27:28.6 |
HIP 22021 |
28.58 |
| 2026-08-01 12:00 |
04:45:26.48 |
+13:29:39.4 |
HIP 22183 |
24.57 |
| 2026-08-02 00:00 |
04:46:25.81 |
+13:31:49.0 |
HIP 22183 |
18.55 |
| 2026-08-02 12:00 |
04:47:25.14 |
+13:33:57.4 |
HIP 22183 |
22.59 |
| 2026-08-03 00:00 |
04:48:24.47 |
+13:36:04.5 |
HIP 22455 |
22.60 |
| 2026-08-03 12:00 |
04:49:23.81 |
+13:38:10.4 |
HIP 22455 |
8.20 |
| 2026-08-04 00:00 |
04:50:23.14 |
+13:40:15.0 |
HIP 22455 |
6.94 |
| 2026-08-04 12:00 |
04:51:22.46 |
+13:42:18.4 |
HIP 22607 |
7.31 |
| 2026-08-05 00:00 |
04:52:21.79 |
+13:44:20.5 |
HIP 22607 |
9.23 |
| 2026-08-05 12:00 |
04:53:21.11 |
+13:46:21.4 |
HIP 22607 |
23.24 |
| 2026-08-06 00:00 |
04:54:20.42 |
+13:48:21.0 |
HIP 22914 |
24.63 |
| 2026-08-06 12:00 |
04:55:19.73 |
+13:50:19.4 |
HIP 22914 |
14.75 |
| 2026-08-07 00:00 |
04:56:19.03 |
+13:52:16.5 |
HIP 22942 |
6.56 |
| 2026-08-07 12:00 |
04:57:18.32 |
+13:54:12.4 |
HIP 23069 |
9.60 |
| 2026-08-08 00:00 |
04:58:17.60 |
+13:56:07.0 |
HIP 23069 |
7.92 |
| 2026-08-08 12:00 |
04:59:16.86 |
+13:58:00.4 |
HIP 23162 |
17.06 |
| 2026-08-09 00:00 |
05:00:16.12 |
+13:59:52.5 |
HIP 23351 |
19.72 |
| 2026-08-09 12:00 |
05:01:15.36 |
+14:01:43.4 |
HIP 23351 |
10.58 |
| 2026-08-10 00:00 |
05:02:14.58 |
+14:03:33.1 |
HIP 23431 |
1.82 |
| 2026-08-10 12:00 |
05:03:13.79 |
+14:05:21.5 |
HIP 23431 |
15.53 |
| 2026-08-11 00:00 |
05:04:12.98 |
+14:07:08.7 |
HIP 23498 |
28.19 |
| 2026-08-11 12:00 |
05:05:12.15 |
+14:08:54.6 |
HIP 23789 |
22.37 |
| 2026-08-12 00:00 |
05:06:11.30 |
+14:10:39.3 |
HIP 23789 |
9.50 |
| 2026-08-12 12:00 |
05:07:10.43 |
+14:12:22.8 |
HIP 23789 |
9.84 |
| 2026-08-13 00:00 |
05:08:09.53 |
+14:14:05.1 |
HIP 23938 |
17.64 |
| 2026-08-13 12:00 |
05:09:08.61 |
+14:15:46.1 |
HIP 23996 |
7.59 |
| 2026-08-14 00:00 |
05:10:07.66 |
+14:17:25.9 |
HIP 23996 |
9.97 |
| 2026-08-14 12:00 |
05:11:06.69 |
+14:19:04.5 |
HIP 24170 |
23.17 |
| 2026-08-15 00:00 |
05:12:05.69 |
+14:20:41.9 |
HIP 24170 |
23.57 |
| 2026-08-15 12:00 |
05:13:04.66 |
+14:22:18.1 |
HIP 24302 |
27.16 |
| 2026-08-16 00:00 |
05:14:03.60 |
+14:23:53.1 |
HIP 24302 |
33.29 |
| 2026-08-16 12:00 |
05:15:02.51 |
+14:25:26.9 |
HIP 24591 |
26.99 |
| 2026-08-17 00:00 |
05:16:01.38 |
+14:26:59.6 |
HIP 24591 |
19.48 |
| 2026-08-17 12:00 |
05:17:00.22 |
+14:28:31.0 |
HIP 24660 |
7.75 |
| 2026-08-18 00:00 |
05:17:59.03 |
+14:30:01.2 |
HIP 24660 |
6.90 |
| 2026-08-18 12:00 |
05:18:57.81 |
+14:31:30.3 |
HIP 24812 |
3.07 |
| 2026-08-19 00:00 |
05:19:56.54 |
+14:32:58.2 |
HIP 24812 |
12.31 |