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 |
-0.502 |
| 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) |
| 2026-06-01 00:00 |
23:40:45.32 |
-19:27:48.7 |
HIP 116782 |
10.02 |
| 2026-06-01 12:00 |
23:40:59.03 |
-19:28:09.8 |
HIP 116782 |
13.26 |
| 2026-06-02 00:00 |
23:41:12.60 |
-19:28:32.2 |
HIP 116782 |
16.48 |
| 2026-06-02 12:00 |
23:41:26.02 |
-19:28:55.8 |
HIP 116782 |
19.66 |
| 2026-06-03 00:00 |
23:41:39.30 |
-19:29:20.8 |
HIP 116782 |
22.81 |
| 2026-06-03 12:00 |
23:41:52.43 |
-19:29:47.0 |
HIP 116782 |
25.94 |
| 2026-06-04 00:00 |
23:42:05.41 |
-19:30:14.5 |
HIP 116973 |
24.42 |
| 2026-06-04 12:00 |
23:42:18.24 |
-19:30:43.2 |
HIP 116973 |
23.01 |
| 2026-06-05 00:00 |
23:42:30.92 |
-19:31:13.3 |
HIP 116973 |
21.91 |
| 2026-06-05 12:00 |
23:42:43.45 |
-19:31:44.7 |
HIP 116973 |
21.17 |
| 2026-06-06 00:00 |
23:42:55.83 |
-19:32:17.3 |
HIP 116973 |
20.81 |
| 2026-06-06 12:00 |
23:43:08.06 |
-19:32:51.3 |
HIP 116973 |
20.85 |
| 2026-06-07 00:00 |
23:43:20.13 |
-19:33:26.5 |
HIP 116973 |
21.25 |
| 2026-06-07 12:00 |
23:43:32.05 |
-19:34:03.1 |
HIP 116973 |
22.00 |
| 2026-06-08 00:00 |
23:43:43.81 |
-19:34:40.9 |
HIP 116973 |
23.04 |
| 2026-06-08 12:00 |
23:43:55.42 |
-19:35:20.1 |
HIP 117128 |
23.02 |
| 2026-06-09 00:00 |
23:44:06.87 |
-19:36:00.6 |
HIP 117128 |
21.19 |
| 2026-06-09 12:00 |
23:44:18.16 |
-19:36:42.4 |
HIP 117128 |
19.57 |
| 2026-06-10 00:00 |
23:44:29.29 |
-19:37:25.5 |
HIP 117128 |
18.21 |
| 2026-06-10 12:00 |
23:44:40.27 |
-19:38:09.9 |
HIP 117128 |
17.16 |
| 2026-06-11 00:00 |
23:44:51.08 |
-19:38:55.6 |
HIP 117128 |
16.45 |
| 2026-06-11 12:00 |
23:45:01.73 |
-19:39:42.7 |
HIP 117128 |
16.13 |
| 2026-06-12 00:00 |
23:45:12.22 |
-19:40:31.1 |
HIP 117128 |
16.19 |
| 2026-06-12 12:00 |
23:45:22.54 |
-19:41:20.8 |
HIP 117128 |
16.62 |
| 2026-06-13 00:00 |
23:45:32.70 |
-19:42:11.8 |
HIP 117128 |
17.38 |
| 2026-06-13 12:00 |
23:45:42.70 |
-19:43:04.2 |
HIP 117128 |
18.42 |
| 2026-06-14 00:00 |
23:45:52.52 |
-19:43:57.9 |
HIP 117128 |
19.68 |
| 2026-06-14 12:00 |
23:46:02.18 |
-19:44:52.9 |
HIP 117128 |
21.11 |
| 2026-06-15 00:00 |
23:46:11.68 |
-19:45:49.2 |
HIP 117128 |
22.66 |
| 2026-06-15 12:00 |
23:46:21.00 |
-19:46:46.8 |
HIP 117128 |
24.32 |
| 2026-06-16 00:00 |
23:46:30.15 |
-19:47:45.8 |
HIP 117128 |
26.04 |
| 2026-06-16 12:00 |
23:46:39.13 |
-19:48:46.1 |
HIP 117377 |
26.23 |
| 2026-06-17 00:00 |
23:46:47.94 |
-19:49:47.7 |
HIP 117377 |
25.56 |
| 2026-06-17 12:00 |
23:46:56.58 |
-19:50:50.6 |
HIP 117377 |
25.14 |
| 2026-06-18 00:00 |
23:47:05.05 |
-19:51:54.8 |
HIP 117377 |
24.96 |
| 2026-06-18 12:00 |
23:47:13.34 |
-19:53:00.4 |
HIP 117377 |
25.02 |
| 2026-06-19 00:00 |
23:47:21.46 |
-19:54:07.2 |
HIP 117377 |
25.31 |
| 2026-06-19 12:00 |
23:47:29.41 |
-19:55:15.4 |
HIP 117377 |
25.83 |
| 2026-06-20 00:00 |
23:47:37.17 |
-19:56:24.8 |
HIP 117377 |
26.54 |
| 2026-06-20 12:00 |
23:47:44.77 |
-19:57:35.5 |
HIP 117377 |
27.43 |
| 2026-06-21 00:00 |
23:47:52.18 |
-19:58:47.6 |
HIP 117377 |
28.48 |
| 2026-06-21 12:00 |
23:47:59.42 |
-20:00:00.9 |
HIP 117377 |
29.66 |
| 2026-06-22 00:00 |
23:48:06.48 |
-20:01:15.5 |
HIP 117377 |
30.96 |