メタデータ
| 項目 |
値 |
| Designation |
212P/NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-12-03T05:58:31.068480Z |
| Orbit solution date (soln_date, UTC) |
2024-04-13T16:43:03Z |
| Obs used |
154 |
| NEO |
- |
| M1 |
16.900 |
| K1 |
8.750 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-01-04.0000000 |
| e |
0.57896629 |
| q (au) |
1.652279 |
| a (au) |
3.924338 |
| i (deg) |
22.407036 |
| Ω (om, deg) |
98.910032 |
| ω (w, deg) |
14.977137 |
| M (ma, deg) |
96.575628 |
等級
散乱 + 全体線形
$$
M_a = (15.367 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.367 |
| n |
6.000 |
| gf |
0.807 |
| gb |
-1.000 |
| k |
0.982 |
| δ90 |
1.401 |
| 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
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
18:05:45.12 |
-15:58:14.4 |
HIP 88806 |
28.81 |
| 2026-03-26 12:00 |
18:05:50.15 |
-15:58:11.0 |
HIP 88806 |
27.63 |
| 2026-03-27 00:00 |
18:05:54.98 |
-15:58:07.6 |
HIP 88806 |
26.49 |
| 2026-03-27 12:00 |
18:05:59.60 |
-15:58:04.2 |
HIP 88806 |
25.41 |
| 2026-03-28 00:00 |
18:06:04.02 |
-15:58:00.9 |
HIP 88806 |
24.37 |
| 2026-03-28 12:00 |
18:06:08.23 |
-15:57:57.7 |
HIP 88806 |
23.39 |
| 2026-03-29 00:00 |
18:06:12.24 |
-15:57:54.5 |
HIP 88806 |
22.46 |
| 2026-03-29 12:00 |
18:06:16.04 |
-15:57:51.4 |
HIP 88806 |
21.57 |
| 2026-03-30 00:00 |
18:06:19.63 |
-15:57:48.3 |
HIP 88806 |
20.74 |
| 2026-03-30 12:00 |
18:06:23.01 |
-15:57:45.4 |
HIP 88806 |
19.96 |
| 2026-03-31 00:00 |
18:06:26.19 |
-15:57:42.5 |
HIP 88806 |
19.23 |
| 2026-03-31 12:00 |
18:06:29.16 |
-15:57:39.7 |
HIP 88806 |
18.56 |
| 2026-04-01 00:00 |
18:06:31.92 |
-15:57:37.0 |
HIP 88806 |
17.93 |
| 2026-04-01 12:00 |
18:06:34.47 |
-15:57:34.4 |
HIP 88806 |
17.35 |
| 2026-04-02 00:00 |
18:06:36.81 |
-15:57:31.9 |
HIP 88806 |
16.82 |
| 2026-04-02 12:00 |
18:06:38.94 |
-15:57:29.5 |
HIP 88806 |
16.35 |
| 2026-04-03 00:00 |
18:06:40.86 |
-15:57:27.2 |
HIP 88806 |
15.92 |
| 2026-04-03 12:00 |
18:06:42.57 |
-15:57:25.0 |
HIP 88806 |
15.54 |
| 2026-04-04 00:00 |
18:06:44.07 |
-15:57:22.9 |
HIP 88806 |
15.22 |
| 2026-04-04 12:00 |
18:06:45.36 |
-15:57:20.9 |
HIP 88806 |
14.94 |
| 2026-04-05 00:00 |
18:06:46.43 |
-15:57:19.1 |
HIP 88806 |
14.70 |
| 2026-04-05 12:00 |
18:06:47.29 |
-15:57:17.4 |
HIP 88806 |
14.52 |
| 2026-04-06 00:00 |
18:06:47.94 |
-15:57:15.8 |
HIP 88806 |
14.39 |
| 2026-04-06 12:00 |
18:06:48.37 |
-15:57:14.3 |
HIP 88806 |
14.30 |
| 2026-04-07 00:00 |
18:06:48.59 |
-15:57:13.0 |
HIP 88806 |
14.26 |
| 2026-04-07 12:00 |
18:06:48.59 |
-15:57:11.8 |
HIP 88806 |
14.26 |
| 2026-04-08 00:00 |
18:06:48.38 |
-15:57:10.8 |
HIP 88806 |
14.32 |
| 2026-04-08 12:00 |
18:06:47.96 |
-15:57:09.9 |
HIP 88806 |
14.42 |
| 2026-04-09 00:00 |
18:06:47.32 |
-15:57:09.1 |
HIP 88806 |
14.57 |
| 2026-04-09 12:00 |
18:06:46.46 |
-15:57:08.5 |
HIP 88806 |
14.76 |
| 2026-04-10 00:00 |
18:06:45.39 |
-15:57:08.1 |
HIP 88806 |
15.00 |
| 2026-04-10 12:00 |
18:06:44.10 |
-15:57:07.9 |
HIP 88806 |
15.30 |
| 2026-04-11 00:00 |
18:06:42.59 |
-15:57:07.8 |
HIP 88806 |
15.64 |
| 2026-04-11 12:00 |
18:06:40.87 |
-15:57:07.8 |
HIP 88806 |
16.03 |
| 2026-04-12 00:00 |
18:06:38.93 |
-15:57:08.1 |
HIP 88806 |
16.46 |
| 2026-04-12 12:00 |
18:06:36.77 |
-15:57:08.5 |
HIP 88806 |
16.95 |
| 2026-04-13 00:00 |
18:06:34.39 |
-15:57:09.1 |
HIP 88806 |
17.49 |
| 2026-04-13 12:00 |
18:06:31.80 |
-15:57:09.9 |
HIP 88806 |
18.08 |
| 2026-04-14 00:00 |
18:06:28.99 |
-15:57:10.9 |
HIP 88806 |
18.73 |
| 2026-04-14 12:00 |
18:06:25.96 |
-15:57:12.0 |
HIP 88806 |
19.42 |
| 2026-04-15 00:00 |
18:06:22.71 |
-15:57:13.4 |
HIP 88806 |
20.17 |
| 2026-04-15 12:00 |
18:06:19.24 |
-15:57:15.0 |
HIP 88806 |
20.97 |
| 2026-04-16 00:00 |
18:06:15.56 |
-15:57:16.8 |
HIP 88806 |
21.82 |