212P/NEAT
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) |
| 2026-02-03 00:00 |
17:41:41.70 |
-15:53:40.5 |
HIP 86669 |
12.83 |
| 2026-02-03 12:00 |
17:42:03.24 |
-15:53:57.3 |
HIP 86669 |
8.38 |
| 2026-02-04 00:00 |
17:42:24.66 |
-15:54:13.6 |
HIP 86669 |
5.46 |
| 2026-02-04 12:00 |
17:42:45.97 |
-15:54:29.5 |
HIP 86669 |
6.50 |
| 2026-02-05 00:00 |
17:43:07.17 |
-15:54:44.9 |
HIP 86669 |
10.34 |
| 2026-02-05 12:00 |
17:43:28.24 |
-15:55:00.0 |
HIP 86669 |
14.93 |
| 2026-02-06 00:00 |
17:43:49.20 |
-15:55:14.7 |
HIP 86669 |
19.73 |
| 2026-02-06 12:00 |
17:44:10.04 |
-15:55:28.9 |
HIP 86669 |
24.60 |
| 2026-02-07 00:00 |
17:44:30.76 |
-15:55:42.8 |
HIP 86669 |
29.49 |
| 2026-02-07 12:00 |
17:44:51.36 |
-15:55:56.3 |
HIP 86992 |
25.59 |
| 2026-02-08 00:00 |
17:45:11.83 |
-15:56:09.3 |
HIP 86992 |
20.71 |
| 2026-02-08 12:00 |
17:45:32.19 |
-15:56:22.0 |
HIP 86992 |
15.89 |
| 2026-02-09 00:00 |
17:45:52.42 |
-15:56:34.3 |
HIP 86992 |
11.17 |
| 2026-02-09 12:00 |
17:46:12.52 |
-15:56:46.3 |
HIP 86992 |
6.68 |
| 2026-02-10 00:00 |
17:46:32.50 |
-15:56:57.8 |
HIP 86992 |
3.38 |
| 2026-02-10 12:00 |
17:46:52.35 |
-15:57:09.0 |
HIP 86992 |
4.92 |
| 2026-02-11 00:00 |
17:47:12.08 |
-15:57:19.8 |
HIP 86992 |
9.06 |
| 2026-02-11 12:00 |
17:47:31.67 |
-15:57:30.2 |
HIP 86992 |
13.57 |
| 2026-02-12 00:00 |
17:47:51.14 |
-15:57:40.3 |
HIP 86992 |
18.16 |
| 2026-02-12 12:00 |
17:48:10.47 |
-15:57:50.0 |
HIP 87207 |
21.03 |
| 2026-02-13 00:00 |
17:48:29.68 |
-15:57:59.4 |
HIP 87207 |
18.60 |
| 2026-02-13 12:00 |
17:48:48.75 |
-15:58:08.4 |
HIP 87207 |
17.11 |
| 2026-02-14 00:00 |
17:49:07.68 |
-15:58:17.1 |
HIP 87207 |
16.78 |
| 2026-02-14 12:00 |
17:49:26.48 |
-15:58:25.4 |
HIP 87207 |
17.66 |
| 2026-02-15 00:00 |
17:49:45.15 |
-15:58:33.4 |
HIP 87333 |
17.43 |
| 2026-02-15 12:00 |
17:50:03.67 |
-15:58:41.1 |
HIP 87333 |
14.09 |
| 2026-02-16 00:00 |
17:50:22.06 |
-15:58:48.4 |
HIP 87333 |
11.54 |
| 2026-02-16 12:00 |
17:50:40.31 |
-15:58:55.4 |
HIP 87333 |
10.35 |
| 2026-02-17 00:00 |
17:50:58.42 |
-15:59:02.1 |
HIP 87333 |
10.92 |
| 2026-02-17 12:00 |
17:51:16.38 |
-15:59:08.5 |
HIP 87333 |
13.00 |
| 2026-02-18 00:00 |
17:51:34.21 |
-15:59:14.6 |
HIP 87333 |
15.97 |
| 2026-02-18 12:00 |
17:51:51.89 |
-15:59:20.4 |
HIP 87413 |
18.41 |
| 2026-02-19 00:00 |
17:52:09.42 |
-15:59:25.9 |
HIP 87413 |
18.86 |
| 2026-02-19 12:00 |
17:52:26.81 |
-15:59:31.1 |
HIP 87413 |
20.19 |
| 2026-02-20 00:00 |
17:52:44.06 |
-15:59:36.0 |
HIP 87413 |
22.22 |
| 2026-02-20 12:00 |
17:53:01.15 |
-15:59:40.6 |
HIP 87574 |
21.16 |
| 2026-02-21 00:00 |
17:53:18.10 |
-15:59:45.0 |
HIP 87574 |
20.43 |
| 2026-02-21 12:00 |
17:53:34.90 |
-15:59:49.1 |
HIP 87574 |
20.49 |
| 2026-02-22 00:00 |
17:53:51.55 |
-15:59:52.9 |
HIP 87574 |
21.31 |
| 2026-02-22 12:00 |
17:54:08.04 |
-15:59:56.4 |
HIP 87574 |
22.80 |
| 2026-02-23 00:00 |
17:54:24.39 |
-15:59:59.7 |
HIP 87574 |
24.82 |
| 2026-02-23 12:00 |
17:54:40.58 |
-16:00:02.7 |
HIP 87813 |
26.23 |
| 2026-02-24 00:00 |
17:54:56.62 |
-16:00:05.5 |
HIP 87813 |
22.84 |