メタデータ
| 項目 |
値 |
| Designation |
169P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-02-15T05:56:36.769920Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T14:12:24Z |
| Obs used |
1992 |
| NEO |
Yes |
| M1 |
17.000 |
| K1 |
4.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2015-09-03.0000000 |
| e |
0.76693015 |
| q (au) |
0.607035 |
| a (au) |
2.604522 |
| i (deg) |
11.297305 |
| Ω (om, deg) |
176.117027 |
| ω (w, deg) |
218.027593 |
| M (ma, deg) |
132.425056 |
等級
散乱 + 全体線形
$$
M_a = (17.947 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.947 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.678 |
| k |
0.832 |
| δ90 |
1.865 |
| 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
ファインディングチャート
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
17:34:24.49 |
+30:37:57.5 |
HIP 85921 |
14.49 |
| 2026-07-29 12:00 |
17:29:52.72 |
+31:11:15.7 |
HIP 85715 |
13.52 |
| 2026-07-30 00:00 |
17:25:09.48 |
+31:44:52.1 |
HIP 85191 |
30.95 |
| 2026-07-30 12:00 |
17:20:14.20 |
+32:18:43.5 |
HIP 84862 |
10.89 |
| 2026-07-31 00:00 |
17:15:06.32 |
+32:52:46.5 |
HIP 84408 |
19.07 |
| 2026-07-31 12:00 |
17:09:45.25 |
+33:26:56.7 |
HIP 83949 |
5.98 |
| 2026-08-01 00:00 |
17:04:10.38 |
+34:01:09.2 |
HIP 83459 |
23.69 |
| 2026-08-01 12:00 |
16:58:21.12 |
+34:35:18.6 |
HIP 83052 |
7.86 |
| 2026-08-02 00:00 |
16:52:16.91 |
+35:09:18.3 |
HIP 82590 |
17.79 |
| 2026-08-02 12:00 |
16:45:57.16 |
+35:43:01.3 |
HIP 82068 |
5.49 |
| 2026-08-03 00:00 |
16:39:21.36 |
+36:16:19.5 |
HIP 81573 |
13.46 |
| 2026-08-03 12:00 |
16:32:29.02 |
+36:49:04.1 |
HIP 81052 |
23.92 |
| 2026-08-04 00:00 |
16:25:19.73 |
+37:21:05.2 |
HIP 80460 |
2.71 |
| 2026-08-04 12:00 |
16:17:53.14 |
+37:52:12.2 |
HIP 79865 |
10.27 |
| 2026-08-05 00:00 |
16:10:09.02 |
+38:22:13.4 |
HIP 79469 |
34.37 |
| 2026-08-05 12:00 |
16:02:07.27 |
+38:50:56.7 |
HIP 78448 |
24.20 |
| 2026-08-06 00:00 |
15:53:47.94 |
+39:18:09.0 |
HIP 78048 |
27.95 |
| 2026-08-06 12:00 |
15:45:11.24 |
+39:43:36.7 |
HIP 77053 |
16.21 |
| 2026-08-07 00:00 |
15:36:17.58 |
+40:07:06.0 |
HIP 76381 |
12.55 |
| 2026-08-07 12:00 |
15:27:07.60 |
+40:28:22.6 |
HIP 75588 |
9.68 |
| 2026-08-08 00:00 |
15:17:42.17 |
+40:47:12.8 |
HIP 75039 |
29.01 |
| 2026-08-08 12:00 |
15:08:02.40 |
+41:03:22.8 |
HIP 74015 |
15.48 |
| 2026-08-09 00:00 |
14:58:09.66 |
+41:16:40.1 |
HIP 73257 |
11.24 |
| 2026-08-09 12:00 |
14:48:05.57 |
+41:26:52.7 |
HIP 72463 |
31.24 |
| 2026-08-10 00:00 |
14:37:51.96 |
+41:33:50.6 |
HIP 71549 |
19.83 |
| 2026-08-10 12:00 |
14:27:30.88 |
+41:37:25.2 |
HIP 70701 |
13.55 |
| 2026-08-11 00:00 |
14:17:04.54 |
+41:37:30.0 |
HIP 69569 |
30.77 |
| 2026-08-11 12:00 |
14:06:35.30 |
+41:34:01.0 |
HIP 68990 |
9.79 |
| 2026-08-12 00:00 |
13:56:05.56 |
+41:26:56.6 |
HIP 67883 |
22.21 |
| 2026-08-12 12:00 |
13:45:37.76 |
+41:16:17.5 |
HIP 67194 |
12.87 |
| 2026-08-13 00:00 |
13:35:14.29 |
+41:02:07.4 |
HIP 66201 |
18.57 |
| 2026-08-13 12:00 |
13:24:57.46 |
+40:44:32.1 |
HIP 65484 |
16.94 |
| 2026-08-14 00:00 |
13:14:49.43 |
+40:23:40.0 |
HIP 64540 |
19.26 |
| 2026-08-14 12:00 |
13:04:52.18 |
+39:59:41.3 |
HIP 63907 |
25.67 |
| 2026-08-15 00:00 |
12:55:07.46 |
+39:32:48.1 |
HIP 63015 |
11.01 |
| 2026-08-15 12:00 |
12:45:36.82 |
+39:03:13.9 |
HIP 62207 |
15.28 |
| 2026-08-16 00:00 |
12:36:21.53 |
+38:31:13.3 |
HIP 61619 |
18.08 |
| 2026-08-16 12:00 |
12:27:22.63 |
+37:57:01.6 |
HIP 60792 |
22.62 |
| 2026-08-17 00:00 |
12:18:40.91 |
+37:20:54.4 |
HIP 59887 |
22.55 |
| 2026-08-17 12:00 |
12:10:16.95 |
+36:43:07.4 |
HIP 59153 |
35.38 |
| 2026-08-18 00:00 |
12:02:11.10 |
+36:03:56.0 |
HIP 58654 |
6.53 |
| 2026-08-18 12:00 |
11:54:23.54 |
+35:23:35.2 |
HIP 58184 |
19.97 |
| 2026-08-19 00:00 |
11:46:54.26 |
+34:42:19.4 |
HIP 57509 |
7.47 |