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) |
| 2026-03-26 00:00 |
22:53:20.37 |
-21:24:20.9 |
HIP 113078 |
11.22 |
| 2026-03-26 12:00 |
22:53:46.98 |
-21:22:31.8 |
HIP 113078 |
4.88 |
| 2026-03-27 00:00 |
22:54:13.53 |
-21:20:43.2 |
HIP 113078 |
2.26 |
| 2026-03-27 12:00 |
22:54:40.03 |
-21:18:55.4 |
HIP 113078 |
8.32 |
| 2026-03-28 00:00 |
22:55:06.47 |
-21:17:08.1 |
HIP 113078 |
14.68 |
| 2026-03-28 12:00 |
22:55:32.85 |
-21:15:21.5 |
HIP 113078 |
21.06 |
| 2026-03-29 00:00 |
22:55:59.18 |
-21:13:35.5 |
HIP 113078 |
27.43 |
| 2026-03-29 12:00 |
22:56:25.45 |
-21:11:50.2 |
HIP 113078 |
33.80 |
| 2026-03-30 00:00 |
22:56:51.67 |
-21:10:05.5 |
HIP 113482 |
33.26 |
| 2026-03-30 12:00 |
22:57:17.82 |
-21:08:21.5 |
HIP 113482 |
27.16 |
| 2026-03-31 00:00 |
22:57:43.92 |
-21:06:38.1 |
HIP 113482 |
21.21 |
| 2026-03-31 12:00 |
22:58:09.96 |
-21:04:55.4 |
HIP 113482 |
15.58 |
| 2026-04-01 00:00 |
22:58:35.94 |
-21:03:13.3 |
HIP 113482 |
10.76 |
| 2026-04-01 12:00 |
22:59:01.86 |
-21:01:32.0 |
HIP 113482 |
8.27 |
| 2026-04-02 00:00 |
22:59:27.71 |
-20:59:51.3 |
HIP 113482 |
9.99 |
| 2026-04-02 12:00 |
22:59:53.51 |
-20:58:11.3 |
HIP 113482 |
14.47 |
| 2026-04-03 00:00 |
23:00:19.25 |
-20:56:32.0 |
HIP 113482 |
19.92 |
| 2026-04-03 12:00 |
23:00:44.92 |
-20:54:53.3 |
HIP 113482 |
25.71 |
| 2026-04-04 00:00 |
23:01:10.53 |
-20:53:15.4 |
HIP 113801 |
21.92 |
| 2026-04-04 12:00 |
23:01:36.08 |
-20:51:38.2 |
HIP 113801 |
15.94 |
| 2026-04-05 00:00 |
23:02:01.57 |
-20:50:01.7 |
HIP 113801 |
10.22 |
| 2026-04-05 12:00 |
23:02:26.99 |
-20:48:25.9 |
HIP 113801 |
5.54 |
| 2026-04-06 00:00 |
23:02:52.35 |
-20:46:50.8 |
HIP 113801 |
5.70 |
| 2026-04-06 12:00 |
23:03:17.64 |
-20:45:16.4 |
HIP 113854 |
9.20 |
| 2026-04-07 00:00 |
23:03:42.86 |
-20:43:42.8 |
HIP 113854 |
8.56 |
| 2026-04-07 12:00 |
23:04:08.02 |
-20:42:09.9 |
HIP 113854 |
11.68 |
| 2026-04-08 00:00 |
23:04:33.12 |
-20:40:37.8 |
HIP 114011 |
11.82 |
| 2026-04-08 12:00 |
23:04:58.14 |
-20:39:06.4 |
HIP 114011 |
5.80 |
| 2026-04-09 00:00 |
23:05:23.10 |
-20:37:35.8 |
HIP 114011 |
0.87 |
| 2026-04-09 12:00 |
23:05:47.99 |
-20:36:05.9 |
HIP 114011 |
6.36 |
| 2026-04-10 00:00 |
23:06:12.81 |
-20:34:36.8 |
HIP 114011 |
12.32 |
| 2026-04-10 12:00 |
23:06:37.55 |
-20:33:08.4 |
HIP 114011 |
18.29 |
| 2026-04-11 00:00 |
23:07:02.23 |
-20:31:40.9 |
HIP 114231 |
14.90 |
| 2026-04-11 12:00 |
23:07:26.84 |
-20:30:14.1 |
HIP 114231 |
10.15 |
| 2026-04-12 00:00 |
23:07:51.38 |
-20:28:48.2 |
HIP 114231 |
7.39 |
| 2026-04-12 12:00 |
23:08:15.84 |
-20:27:23.0 |
HIP 114231 |
8.71 |
| 2026-04-13 00:00 |
23:08:40.23 |
-20:25:58.6 |
HIP 114231 |
12.90 |
| 2026-04-13 12:00 |
23:09:04.55 |
-20:24:35.0 |
HIP 114231 |
18.03 |
| 2026-04-14 00:00 |
23:09:28.79 |
-20:23:12.3 |
HIP 114231 |
23.49 |
| 2026-04-14 12:00 |
23:09:52.95 |
-20:21:50.4 |
HIP 114231 |
29.07 |
| 2026-04-15 00:00 |
23:10:17.04 |
-20:20:29.3 |
HIP 114231 |
34.72 |
| 2026-04-15 12:00 |
23:10:41.06 |
-20:19:09.0 |
HIP 114231 |
40.38 |
| 2026-04-16 00:00 |
23:11:04.99 |
-20:17:49.6 |
HIP 114509 |
42.98 |