163P/NEAT
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) |
| 2026-02-03 00:00 |
23:39:48.02 |
-13:08:52.3 |
HIP 116812 |
15.63 |
| 2026-02-03 12:00 |
23:40:26.92 |
-13:04:03.4 |
HIP 116812 |
7.13 |
| 2026-02-04 00:00 |
23:41:05.91 |
-12:59:14.0 |
HIP 116812 |
9.15 |
| 2026-02-04 12:00 |
23:41:45.01 |
-12:54:24.1 |
HIP 116812 |
18.57 |
| 2026-02-05 00:00 |
23:42:24.21 |
-12:49:33.6 |
HIP 116812 |
28.91 |
| 2026-02-05 12:00 |
23:43:03.51 |
-12:44:42.7 |
HIP 117085 |
31.34 |
| 2026-02-06 00:00 |
23:43:42.90 |
-12:39:51.3 |
HIP 117002 |
27.92 |
| 2026-02-06 12:00 |
23:44:22.39 |
-12:34:59.5 |
HIP 117002 |
28.13 |
| 2026-02-07 00:00 |
23:45:01.98 |
-12:30:07.1 |
HIP 117262 |
27.36 |
| 2026-02-07 12:00 |
23:45:41.67 |
-12:25:14.3 |
HIP 117262 |
24.03 |
| 2026-02-08 00:00 |
23:46:21.45 |
-12:20:20.9 |
HIP 117262 |
25.32 |
| 2026-02-08 12:00 |
23:47:01.33 |
-12:15:27.2 |
HIP 117314 |
21.10 |
| 2026-02-09 00:00 |
23:47:41.31 |
-12:10:32.9 |
HIP 117314 |
17.06 |
| 2026-02-09 12:00 |
23:48:21.37 |
-12:05:38.2 |
HIP 117314 |
19.41 |
| 2026-02-10 00:00 |
23:49:01.54 |
-12:00:43.0 |
HIP 117314 |
26.53 |
| 2026-02-10 12:00 |
23:49:41.80 |
-11:55:47.4 |
HIP 117579 |
24.23 |
| 2026-02-11 00:00 |
23:50:22.15 |
-11:50:51.3 |
HIP 117579 |
15.11 |
| 2026-02-11 12:00 |
23:51:02.59 |
-11:45:54.8 |
HIP 117579 |
10.63 |
| 2026-02-12 00:00 |
23:51:43.13 |
-11:40:57.8 |
HIP 117696 |
7.01 |
| 2026-02-12 12:00 |
23:52:23.75 |
-11:36:00.4 |
HIP 117696 |
7.95 |
| 2026-02-13 00:00 |
23:53:04.47 |
-11:31:02.6 |
HIP 117696 |
18.04 |
| 2026-02-13 12:00 |
23:53:45.28 |
-11:26:04.4 |
HIP 117789 |
26.37 |
| 2026-02-14 00:00 |
23:54:26.19 |
-11:21:05.7 |
HIP 117789 |
26.94 |
| 2026-02-14 12:00 |
23:55:07.18 |
-11:16:06.7 |
HIP 117988 |
27.02 |
| 2026-02-15 00:00 |
23:55:48.26 |
-11:11:07.2 |
HIP 117988 |
19.28 |
| 2026-02-15 12:00 |
23:56:29.42 |
-11:06:07.3 |
HIP 117988 |
16.32 |
| 2026-02-16 00:00 |
23:57:10.68 |
-11:01:07.0 |
HIP 117988 |
20.39 |
| 2026-02-16 12:00 |
23:57:52.03 |
-10:56:06.4 |
HIP 117988 |
28.67 |
| 2026-02-17 00:00 |
23:58:33.46 |
-10:51:05.3 |
HIP 33 |
35.77 |
| 2026-02-17 12:00 |
23:59:14.97 |
-10:46:03.9 |
HIP 33 |
24.93 |
| 2026-02-18 00:00 |
23:59:56.58 |
-10:41:02.1 |
HIP 33 |
14.88 |
| 2026-02-18 12:00 |
00:00:38.27 |
-10:36:00.0 |
HIP 33 |
8.99 |
| 2026-02-19 00:00 |
00:01:20.04 |
-10:30:57.5 |
HIP 33 |
14.19 |
| 2026-02-19 12:00 |
00:02:01.90 |
-10:25:54.6 |
HIP 33 |
24.19 |
| 2026-02-20 00:00 |
00:02:43.84 |
-10:20:51.4 |
HIP 329 |
25.04 |
| 2026-02-20 12:00 |
00:03:25.87 |
-10:15:47.8 |
HIP 329 |
13.57 |
| 2026-02-21 00:00 |
00:04:07.97 |
-10:10:43.9 |
HIP 329 |
2.50 |
| 2026-02-21 12:00 |
00:04:50.16 |
-10:05:39.7 |
HIP 329 |
9.73 |
| 2026-02-22 00:00 |
00:05:32.43 |
-10:00:35.2 |
HIP 329 |
21.24 |
| 2026-02-22 12:00 |
00:06:14.79 |
-09:55:30.3 |
HIP 462 |
21.37 |
| 2026-02-23 00:00 |
00:06:57.22 |
-09:50:25.2 |
HIP 462 |
25.09 |
| 2026-02-23 12:00 |
00:07:39.73 |
-09:45:19.7 |
HIP 462 |
32.76 |
| 2026-02-24 00:00 |
00:08:22.32 |
-09:40:13.9 |
HIP 771 |
35.26 |