231P/LINEAR-NEAT
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) |
| 2026-02-03 00:00 |
04:41:39.28 |
+11:16:51.3 |
HIP 21983 |
28.40 |
| 2026-02-03 12:00 |
04:41:38.30 |
+11:18:44.7 |
HIP 21983 |
29.15 |
| 2026-02-04 00:00 |
04:41:37.59 |
+11:20:38.7 |
HIP 21983 |
29.93 |
| 2026-02-04 12:00 |
04:41:37.16 |
+11:22:33.1 |
HIP 21866 |
29.63 |
| 2026-02-05 00:00 |
04:41:37.01 |
+11:24:28.2 |
HIP 21866 |
27.77 |
| 2026-02-05 12:00 |
04:41:37.13 |
+11:26:23.7 |
HIP 21866 |
25.91 |
| 2026-02-06 00:00 |
04:41:37.53 |
+11:28:19.8 |
HIP 21866 |
24.02 |
| 2026-02-06 12:00 |
04:41:38.20 |
+11:30:16.3 |
HIP 21866 |
22.11 |
| 2026-02-07 00:00 |
04:41:39.15 |
+11:32:13.4 |
HIP 21866 |
20.19 |
| 2026-02-07 12:00 |
04:41:40.37 |
+11:34:11.0 |
HIP 21866 |
18.24 |
| 2026-02-08 00:00 |
04:41:41.87 |
+11:36:09.0 |
HIP 21866 |
16.26 |
| 2026-02-08 12:00 |
04:41:43.64 |
+11:38:07.5 |
HIP 21866 |
14.26 |
| 2026-02-09 00:00 |
04:41:45.69 |
+11:40:06.4 |
HIP 21866 |
12.24 |
| 2026-02-09 12:00 |
04:41:48.01 |
+11:42:05.8 |
HIP 21866 |
10.19 |
| 2026-02-10 00:00 |
04:41:50.61 |
+11:44:05.7 |
HIP 21866 |
8.11 |
| 2026-02-10 12:00 |
04:41:53.48 |
+11:46:05.9 |
HIP 21866 |
6.01 |
| 2026-02-11 00:00 |
04:41:56.63 |
+11:48:06.6 |
HIP 21866 |
3.89 |
| 2026-02-11 12:00 |
04:42:00.04 |
+11:50:07.7 |
HIP 21866 |
1.79 |
| 2026-02-12 00:00 |
04:42:03.73 |
+11:52:09.2 |
HIP 21866 |
0.89 |
| 2026-02-12 12:00 |
04:42:07.69 |
+11:54:11.1 |
HIP 21866 |
2.88 |
| 2026-02-13 00:00 |
04:42:11.93 |
+11:56:13.3 |
HIP 21866 |
5.12 |
| 2026-02-13 12:00 |
04:42:16.43 |
+11:58:15.9 |
HIP 21866 |
7.42 |
| 2026-02-14 00:00 |
04:42:21.21 |
+12:00:18.9 |
HIP 21866 |
9.76 |
| 2026-02-14 12:00 |
04:42:26.26 |
+12:02:22.3 |
HIP 21918 |
11.63 |
| 2026-02-15 00:00 |
04:42:31.57 |
+12:04:25.9 |
HIP 21918 |
9.20 |
| 2026-02-15 12:00 |
04:42:37.16 |
+12:06:29.9 |
HIP 21918 |
6.75 |
| 2026-02-16 00:00 |
04:42:43.01 |
+12:08:34.3 |
HIP 21918 |
4.29 |
| 2026-02-16 12:00 |
04:42:49.14 |
+12:10:38.9 |
HIP 21918 |
1.97 |
| 2026-02-17 00:00 |
04:42:55.53 |
+12:12:43.8 |
HIP 21918 |
1.65 |
| 2026-02-17 12:00 |
04:43:02.18 |
+12:14:49.0 |
HIP 21918 |
3.94 |
| 2026-02-18 00:00 |
04:43:09.11 |
+12:16:54.5 |
HIP 21980 |
6.12 |
| 2026-02-18 12:00 |
04:43:16.29 |
+12:19:00.3 |
HIP 21980 |
3.64 |
| 2026-02-19 00:00 |
04:43:23.75 |
+12:21:06.3 |
HIP 21980 |
1.96 |
| 2026-02-19 12:00 |
04:43:31.46 |
+12:23:12.6 |
HIP 21980 |
3.15 |
| 2026-02-20 00:00 |
04:43:39.44 |
+12:25:19.1 |
HIP 21973 |
4.56 |
| 2026-02-20 12:00 |
04:43:47.68 |
+12:27:25.8 |
HIP 21973 |
6.37 |
| 2026-02-21 00:00 |
04:43:56.18 |
+12:29:32.7 |
HIP 21973 |
8.86 |
| 2026-02-21 12:00 |
04:44:04.95 |
+12:31:39.9 |
HIP 22012 |
9.88 |
| 2026-02-22 00:00 |
04:44:13.97 |
+12:33:47.2 |
HIP 22012 |
8.88 |
| 2026-02-22 12:00 |
04:44:23.24 |
+12:35:54.7 |
HIP 22012 |
8.93 |
| 2026-02-23 00:00 |
04:44:32.78 |
+12:38:02.4 |
HIP 22012 |
10.05 |
| 2026-02-23 12:00 |
04:44:42.57 |
+12:40:10.3 |
HIP 22012 |
11.99 |
| 2026-02-24 00:00 |
04:44:52.61 |
+12:42:18.3 |
HIP 22012 |
14.44 |