180P/NEAT
メタデータ
| 項目 |
値 |
| Designation |
180P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2015-12-12T15:22:26.811840Z |
| Orbit solution date (soln_date, UTC) |
2024-03-20T08:31:27Z |
| Obs used |
1053 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
22.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2016-04-24.0000000 |
| e |
0.35485436 |
| q (au) |
2.489292 |
| a (au) |
3.858497 |
| i (deg) |
16.870826 |
| Ω (om, deg) |
84.571386 |
| ω (w, deg) |
94.861225 |
| M (ma, deg) |
17.342053 |
等級
散乱 + 全体線形
$$
M_a = (9.358 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.358 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| k |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 2022-09-29 |
2023-06-28 |
+16.2858 |
-6.848 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
22:05:04.69 |
-25:08:31.6 |
HIP 108985 |
4.80 |
| 2026-02-03 12:00 |
22:05:33.82 |
-25:06:05.9 |
HIP 108985 |
11.26 |
| 2026-02-04 00:00 |
22:06:02.96 |
-25:03:40.2 |
HIP 108985 |
18.16 |
| 2026-02-04 12:00 |
22:06:32.11 |
-25:01:14.7 |
HIP 108985 |
25.13 |
| 2026-02-05 00:00 |
22:07:01.25 |
-24:58:49.4 |
HIP 108985 |
32.13 |
| 2026-02-05 12:00 |
22:07:30.41 |
-24:56:24.1 |
HIP 109222 |
32.83 |
| 2026-02-06 00:00 |
22:07:59.56 |
-24:53:59.1 |
HIP 109222 |
30.78 |
| 2026-02-06 12:00 |
22:08:28.72 |
-24:51:34.1 |
HIP 109222 |
30.29 |
| 2026-02-07 00:00 |
22:08:57.88 |
-24:49:09.3 |
HIP 109498 |
27.31 |
| 2026-02-07 12:00 |
22:09:27.04 |
-24:46:44.6 |
HIP 109498 |
20.33 |
| 2026-02-08 00:00 |
22:09:56.21 |
-24:44:20.1 |
HIP 109498 |
13.41 |
| 2026-02-08 12:00 |
22:10:25.37 |
-24:41:55.8 |
HIP 109498 |
6.77 |
| 2026-02-09 00:00 |
22:10:54.54 |
-24:39:31.6 |
HIP 109498 |
3.33 |
| 2026-02-09 12:00 |
22:11:23.70 |
-24:37:07.6 |
HIP 109498 |
8.69 |
| 2026-02-10 00:00 |
22:11:52.86 |
-24:34:43.7 |
HIP 109498 |
15.47 |
| 2026-02-10 12:00 |
22:12:22.02 |
-24:32:20.0 |
HIP 109498 |
22.42 |
| 2026-02-11 00:00 |
22:12:51.17 |
-24:29:56.5 |
HIP 109768 |
17.75 |
| 2026-02-11 12:00 |
22:13:20.33 |
-24:27:33.2 |
HIP 109768 |
13.71 |
| 2026-02-12 00:00 |
22:13:49.47 |
-24:25:10.1 |
HIP 109768 |
12.65 |
| 2026-02-12 12:00 |
22:14:18.62 |
-24:22:47.2 |
HIP 109768 |
15.21 |
| 2026-02-13 00:00 |
22:14:47.76 |
-24:20:24.4 |
HIP 109912 |
18.72 |
| 2026-02-13 12:00 |
22:15:16.89 |
-24:18:01.9 |
HIP 109912 |
17.72 |
| 2026-02-14 00:00 |
22:15:46.02 |
-24:15:39.6 |
HIP 109912 |
19.41 |
| 2026-02-14 12:00 |
22:16:15.13 |
-24:13:17.5 |
HIP 109912 |
23.20 |
| 2026-02-15 00:00 |
22:16:44.25 |
-24:10:55.6 |
HIP 109912 |
28.27 |
| 2026-02-15 12:00 |
22:17:13.35 |
-24:08:33.9 |
HIP 109912 |
34.04 |
| 2026-02-16 00:00 |
22:17:42.44 |
-24:06:12.5 |
HIP 110210 |
30.00 |
| 2026-02-16 12:00 |
22:18:11.52 |
-24:03:51.3 |
HIP 110210 |
23.37 |
| 2026-02-17 00:00 |
22:18:40.59 |
-24:01:30.3 |
HIP 110210 |
17.10 |
| 2026-02-17 12:00 |
22:19:09.66 |
-23:59:09.6 |
HIP 110210 |
11.73 |
| 2026-02-18 00:00 |
22:19:38.70 |
-23:56:49.2 |
HIP 110210 |
9.07 |
| 2026-02-18 12:00 |
22:20:07.74 |
-23:54:29.0 |
HIP 110210 |
11.22 |
| 2026-02-19 00:00 |
22:20:36.76 |
-23:52:09.0 |
HIP 110210 |
16.40 |
| 2026-02-19 12:00 |
22:21:05.77 |
-23:49:49.3 |
HIP 110210 |
22.60 |
| 2026-02-20 00:00 |
22:21:34.76 |
-23:47:29.9 |
HIP 110210 |
29.18 |
| 2026-02-20 12:00 |
22:22:03.74 |
-23:45:10.8 |
HIP 110210 |
35.93 |
| 2026-02-21 00:00 |
22:22:32.70 |
-23:42:51.9 |
HIP 110616 |
34.71 |
| 2026-02-21 12:00 |
22:23:01.64 |
-23:40:33.4 |
HIP 110616 |
28.10 |
| 2026-02-22 00:00 |
22:23:30.57 |
-23:38:15.1 |
HIP 110616 |
21.76 |
| 2026-02-22 12:00 |
22:23:59.48 |
-23:35:57.1 |
HIP 110616 |
15.99 |
| 2026-02-23 00:00 |
22:24:28.37 |
-23:33:39.4 |
HIP 110616 |
11.68 |
| 2026-02-23 12:00 |
22:24:57.24 |
-23:31:22.1 |
HIP 110616 |
10.75 |
| 2026-02-24 00:00 |
22:25:26.09 |
-23:29:05.0 |
HIP 110616 |
13.89 |