メタデータ
| 項目 |
値 |
| Designation |
231P/LINEAR-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-05-16T10:25:55.799040Z |
| Orbit solution date (soln_date, UTC) |
2023-09-12T03:13:15Z |
| Obs used |
573 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
20.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2012-06-21.0000000 |
| e |
0.24682623 |
| q (au) |
3.032307 |
| a (au) |
4.026040 |
| i (deg) |
12.325761 |
| Ω (om, deg) |
133.080846 |
| ω (w, deg) |
42.426644 |
| M (ma, deg) |
48.994036 |
等級
散乱 + 全体線形
$$
M_a = (15.244 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.244 |
| n |
2.000 |
| gf |
0.898 |
| gb |
-0.500 |
| k |
0.897 |
| δ90 |
3.500 |
| 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) |
| 2026-05-12 00:00 |
05:49:26.67 |
+17:24:22.0 |
HIP 27428 |
13.89 |
| 2026-05-12 12:00 |
05:50:02.61 |
+17:25:30.5 |
HIP 27428 |
22.37 |
| 2026-05-13 00:00 |
05:50:38.64 |
+17:26:38.3 |
HIP 27428 |
30.96 |
| 2026-05-13 12:00 |
05:51:14.76 |
+17:27:45.2 |
HIP 27590 |
35.31 |
| 2026-05-14 00:00 |
05:51:50.98 |
+17:28:51.5 |
HIP 27590 |
37.71 |
| 2026-05-14 12:00 |
05:52:27.28 |
+17:29:56.9 |
HIP 27972 |
36.53 |
| 2026-05-15 00:00 |
05:53:03.66 |
+17:31:01.6 |
HIP 27972 |
28.24 |
| 2026-05-15 12:00 |
05:53:40.14 |
+17:32:05.6 |
HIP 27972 |
20.31 |
| 2026-05-16 00:00 |
05:54:16.70 |
+17:33:08.7 |
HIP 27972 |
13.44 |
| 2026-05-16 12:00 |
05:54:53.35 |
+17:34:11.1 |
HIP 27972 |
10.14 |
| 2026-05-17 00:00 |
05:55:30.08 |
+17:35:12.8 |
HIP 27972 |
13.41 |
| 2026-05-17 12:00 |
05:56:06.89 |
+17:36:13.6 |
HIP 27972 |
20.32 |
| 2026-05-18 00:00 |
05:56:43.79 |
+17:37:13.7 |
HIP 28079 |
23.72 |
| 2026-05-18 12:00 |
05:57:20.77 |
+17:38:13.0 |
HIP 28079 |
27.24 |
| 2026-05-19 00:00 |
05:57:57.82 |
+17:39:11.5 |
HIP 28348 |
22.80 |
| 2026-05-19 12:00 |
05:58:34.96 |
+17:40:09.2 |
HIP 28348 |
14.68 |
| 2026-05-20 00:00 |
05:59:12.18 |
+17:41:06.1 |
HIP 28348 |
8.33 |
| 2026-05-20 12:00 |
05:59:49.47 |
+17:42:02.3 |
HIP 120002 |
9.05 |
| 2026-05-21 00:00 |
06:00:26.84 |
+17:42:57.6 |
HIP 28497 |
12.46 |
| 2026-05-21 12:00 |
06:01:04.28 |
+17:43:52.2 |
HIP 28497 |
9.78 |
| 2026-05-22 00:00 |
06:01:41.80 |
+17:44:46.0 |
HIP 28497 |
14.04 |
| 2026-05-22 12:00 |
06:02:19.39 |
+17:45:38.9 |
HIP 28647 |
10.64 |
| 2026-05-23 00:00 |
06:02:57.06 |
+17:46:31.1 |
HIP 28647 |
6.58 |
| 2026-05-23 12:00 |
06:03:34.80 |
+17:47:22.5 |
HIP 28647 |
11.66 |
| 2026-05-24 00:00 |
06:04:12.61 |
+17:48:13.0 |
HIP 28647 |
19.80 |
| 2026-05-24 12:00 |
06:04:50.49 |
+17:49:02.8 |
HIP 28647 |
28.50 |
| 2026-05-25 00:00 |
06:05:28.44 |
+17:49:51.8 |
HIP 28815 |
29.64 |
| 2026-05-25 12:00 |
06:06:06.46 |
+17:50:40.0 |
HIP 28815 |
32.26 |
| 2026-05-26 00:00 |
06:06:44.54 |
+17:51:27.3 |
HIP 29073 |
37.00 |
| 2026-05-26 12:00 |
06:07:22.70 |
+17:52:13.9 |
HIP 29189 |
29.67 |
| 2026-05-27 00:00 |
06:08:00.92 |
+17:52:59.6 |
HIP 29189 |
20.70 |
| 2026-05-27 12:00 |
06:08:39.21 |
+17:53:44.6 |
HIP 29189 |
11.96 |
| 2026-05-28 00:00 |
06:09:17.56 |
+17:54:28.7 |
HIP 29189 |
4.95 |
| 2026-05-28 12:00 |
06:09:55.98 |
+17:55:12.0 |
HIP 29248 |
1.48 |
| 2026-05-29 00:00 |
06:10:34.46 |
+17:55:54.6 |
HIP 29248 |
7.97 |
| 2026-05-29 12:00 |
06:11:13.00 |
+17:56:36.3 |
HIP 29326 |
11.54 |
| 2026-05-30 00:00 |
06:11:51.61 |
+17:57:17.1 |
HIP 29430 |
11.35 |
| 2026-05-30 12:00 |
06:12:30.28 |
+17:57:57.2 |
HIP 29430 |
14.06 |
| 2026-05-31 00:00 |
06:13:09.01 |
+17:58:36.5 |
HIP 29543 |
14.47 |
| 2026-05-31 12:00 |
06:13:47.81 |
+17:59:14.9 |
HIP 29616 |
10.85 |
| 2026-06-01 00:00 |
06:14:26.66 |
+17:59:52.5 |
HIP 29616 |
5.51 |
| 2026-06-01 12:00 |
06:15:05.57 |
+18:00:29.3 |
HIP 29616 |
10.71 |
| 2026-06-02 00:00 |
06:15:44.55 |
+18:01:05.3 |
HIP 29707 |
16.56 |