メタデータ
| 項目 |
値 |
| Designation |
169P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-04-29T14:32:38.469120Z |
| Orbit solution date (soln_date, UTC) |
2026-09-29T13:12:11Z |
| Obs used |
2519 |
| NEO |
Yes |
| M1 |
17.600 |
| 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) |
2017-10-22.0000000 |
| e |
0.76801338 |
| q (au) |
0.603750 |
| a (au) |
2.602519 |
| i (deg) |
11.295564 |
| Ω (om, deg) |
176.090965 |
| ω (w, deg) |
218.077257 |
| M (ma, deg) |
315.489213 |
等級
散乱 + 全体線形
$$
M_a = (17.671 + 5.566\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
17.671 |
| n |
5.566 |
| gf |
1.000 |
| gb |
-0.954 |
| 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
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) |
| 2026-09-25 00:00 |
09:41:39.97 |
+06:02:02.0 |
HIP 47639 |
20.50 |
| 2026-09-25 12:00 |
09:42:32.05 |
+05:52:48.3 |
HIP 47639 |
4.60 |
| 2026-09-26 00:00 |
09:43:25.69 |
+05:43:41.2 |
HIP 47639 |
11.56 |
| 2026-09-26 12:00 |
09:44:20.84 |
+05:34:40.5 |
HIP 47639 |
27.98 |
| 2026-09-27 00:00 |
09:45:17.42 |
+05:25:45.8 |
HIP 47767 |
33.17 |
| 2026-09-27 12:00 |
09:46:15.38 |
+05:16:56.9 |
HIP 48044 |
26.36 |
| 2026-09-28 00:00 |
09:47:14.65 |
+05:08:13.5 |
HIP 48044 |
25.97 |
| 2026-09-28 12:00 |
09:48:15.15 |
+04:59:35.4 |
HIP 48261 |
33.66 |
| 2026-09-29 00:00 |
09:49:16.84 |
+04:51:02.3 |
HIP 48295 |
24.17 |
| 2026-09-29 12:00 |
09:50:19.65 |
+04:42:34.1 |
HIP 48295 |
17.84 |
| 2026-09-30 00:00 |
09:51:23.51 |
+04:34:10.6 |
HIP 48273 |
18.98 |
| 2026-09-30 12:00 |
09:52:28.38 |
+04:25:51.5 |
HIP 48475 |
12.30 |
| 2026-10-01 00:00 |
09:53:34.19 |
+04:17:36.8 |
HIP 48475 |
15.51 |
| 2026-10-01 12:00 |
09:54:40.87 |
+04:09:26.1 |
HIP 48609 |
8.22 |
| 2026-10-02 00:00 |
09:55:48.39 |
+04:01:19.5 |
HIP 48750 |
12.20 |
| 2026-10-02 12:00 |
09:56:56.69 |
+03:53:16.7 |
HIP 48772 |
5.09 |
| 2026-10-03 00:00 |
09:58:05.70 |
+03:45:17.7 |
HIP 48772 |
22.82 |
| 2026-10-03 12:00 |
09:59:15.39 |
+03:37:22.2 |
HIP 48990 |
15.87 |
| 2026-10-04 00:00 |
10:00:25.70 |
+03:29:30.3 |
HIP 48990 |
12.41 |
| 2026-10-04 12:00 |
10:01:36.58 |
+03:21:41.7 |
HIP 49213 |
24.82 |
| 2026-10-05 00:00 |
10:02:47.98 |
+03:13:56.5 |
HIP 49329 |
20.18 |
| 2026-10-05 12:00 |
10:03:59.87 |
+03:06:14.4 |
HIP 49329 |
6.22 |
| 2026-10-06 00:00 |
10:05:12.20 |
+02:58:35.5 |
HIP 49329 |
20.85 |
| 2026-10-06 12:00 |
10:06:24.92 |
+02:50:59.7 |
HIP 49544 |
10.54 |
| 2026-10-07 00:00 |
10:07:37.99 |
+02:43:26.8 |
HIP 49544 |
17.71 |
| 2026-10-07 12:00 |
10:08:51.38 |
+02:35:56.9 |
HIP 49756 |
15.87 |
| 2026-10-08 00:00 |
10:10:05.05 |
+02:28:29.9 |
HIP 49777 |
9.79 |
| 2026-10-08 12:00 |
10:11:18.95 |
+02:21:05.7 |
HIP 49777 |
24.87 |
| 2026-10-09 00:00 |
10:12:33.07 |
+02:13:44.3 |
HIP 50091 |
31.13 |
| 2026-10-09 12:00 |
10:13:47.35 |
+02:06:25.6 |
HIP 50091 |
33.79 |
| 2026-10-10 00:00 |
10:15:01.78 |
+01:59:09.6 |
HIP 50348 |
29.68 |
| 2026-10-10 12:00 |
10:16:16.32 |
+01:51:56.3 |
HIP 50348 |
9.72 |
| 2026-10-11 00:00 |
10:17:30.94 |
+01:44:45.7 |
HIP 50348 |
10.30 |
| 2026-10-11 12:00 |
10:18:45.62 |
+01:37:37.6 |
HIP 50483 |
5.04 |
| 2026-10-12 00:00 |
10:20:00.32 |
+01:30:32.2 |
HIP 50483 |
22.68 |
| 2026-10-12 12:00 |
10:21:15.02 |
+01:23:29.2 |
HIP 50811 |
18.29 |
| 2026-10-13 00:00 |
10:22:29.71 |
+01:16:28.9 |
HIP 50831 |
8.32 |
| 2026-10-13 12:00 |
10:23:44.35 |
+01:09:31.0 |
HIP 50831 |
14.83 |
| 2026-10-14 00:00 |
10:24:58.92 |
+01:02:35.6 |
HIP 51034 |
9.31 |
| 2026-10-14 12:00 |
10:26:13.40 |
+00:55:42.8 |
HIP 51034 |
13.35 |
| 2026-10-15 00:00 |
10:27:27.78 |
+00:48:52.3 |
HIP 51317 |
22.09 |
| 2026-10-15 12:00 |
10:28:42.04 |
+00:42:04.4 |
HIP 51317 |
9.17 |
| 2026-10-16 00:00 |
10:29:56.15 |
+00:35:18.8 |
HIP 51481 |
19.36 |