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
$$
M_a = (15.502 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
15.502 |
| n |
2.000 |
| gf |
0.896 |
| gb |
-0.523 |
| k |
0.877 |
| δ90 |
3.512 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
06:16:23.58 |
+18:01:40.4 |
HIP 29875 |
14.97 |
| 2026-06-03 00:00 |
06:17:02.67 |
+18:02:14.7 |
HIP 29875 |
6.20 |
| 2026-06-03 12:00 |
06:17:41.81 |
+18:02:48.2 |
HIP 29875 |
5.13 |
| 2026-06-04 00:00 |
06:18:21.01 |
+18:03:20.9 |
HIP 29875 |
13.72 |
| 2026-06-04 12:00 |
06:19:00.27 |
+18:03:52.7 |
HIP 29986 |
22.10 |
| 2026-06-05 00:00 |
06:19:39.59 |
+18:04:23.8 |
HIP 30139 |
13.13 |
| 2026-06-05 12:00 |
06:20:18.96 |
+18:04:53.9 |
HIP 30139 |
4.17 |
| 2026-06-06 00:00 |
06:20:58.38 |
+18:05:23.3 |
HIP 30146 |
5.86 |
| 2026-06-06 12:00 |
06:21:37.86 |
+18:05:51.8 |
HIP 30146 |
14.85 |
| 2026-06-07 00:00 |
06:22:17.39 |
+18:06:19.5 |
HIP 30218 |
23.89 |
| 2026-06-07 12:00 |
06:22:56.98 |
+18:06:46.3 |
HIP 30428 |
24.37 |
| 2026-06-08 00:00 |
06:23:36.61 |
+18:07:12.4 |
HIP 30428 |
20.52 |
| 2026-06-08 12:00 |
06:24:16.30 |
+18:07:37.5 |
HIP 30428 |
20.65 |
| 2026-06-09 00:00 |
06:24:56.04 |
+18:08:01.9 |
HIP 30428 |
24.71 |
| 2026-06-09 12:00 |
06:25:35.83 |
+18:08:25.4 |
HIP 30749 |
30.06 |
| 2026-06-10 00:00 |
06:26:15.67 |
+18:08:48.0 |
HIP 30749 |
20.71 |
| 2026-06-10 12:00 |
06:26:55.55 |
+18:09:09.9 |
HIP 30749 |
11.53 |
| 2026-06-11 00:00 |
06:27:35.49 |
+18:09:30.9 |
HIP 30749 |
4.10 |
| 2026-06-11 12:00 |
06:28:15.47 |
+18:09:51.0 |
HIP 30749 |
9.01 |
| 2026-06-12 00:00 |
06:28:55.50 |
+18:10:10.3 |
HIP 30749 |
18.08 |
| 2026-06-12 12:00 |
06:29:35.58 |
+18:10:28.7 |
HIP 30801 |
25.52 |
| 2026-06-13 00:00 |
06:30:15.70 |
+18:10:46.3 |
HIP 30890 |
31.15 |
| 2026-06-13 12:00 |
06:30:55.86 |
+18:11:03.1 |
HIP 31158 |
31.02 |
| 2026-06-14 00:00 |
06:31:36.07 |
+18:11:19.0 |
HIP 31158 |
26.28 |
| 2026-06-14 12:00 |
06:32:16.33 |
+18:11:34.1 |
HIP 31158 |
24.52 |
| 2026-06-15 00:00 |
06:32:56.62 |
+18:11:48.3 |
HIP 31158 |
26.35 |
| 2026-06-15 12:00 |
06:33:36.96 |
+18:12:01.7 |
HIP 31435 |
24.16 |
| 2026-06-16 00:00 |
06:34:17.34 |
+18:12:14.2 |
HIP 31435 |
15.57 |
| 2026-06-16 12:00 |
06:34:57.75 |
+18:12:25.9 |
HIP 31435 |
9.22 |
| 2026-06-17 00:00 |
06:35:38.21 |
+18:12:36.7 |
HIP 31435 |
10.59 |
| 2026-06-17 12:00 |
06:36:18.70 |
+18:12:46.7 |
HIP 31435 |
18.00 |
| 2026-06-18 00:00 |
06:36:59.23 |
+18:12:55.8 |
HIP 31686 |
15.71 |
| 2026-06-18 12:00 |
06:37:39.80 |
+18:13:04.1 |
HIP 31686 |
11.12 |
| 2026-06-19 00:00 |
06:38:20.41 |
+18:13:11.6 |
HIP 31686 |
13.65 |
| 2026-06-19 12:00 |
06:39:01.04 |
+18:13:18.2 |
HIP 31734 |
18.17 |
| 2026-06-20 00:00 |
06:39:41.72 |
+18:13:24.0 |
HIP 31734 |
24.55 |
| 2026-06-20 12:00 |
06:40:22.42 |
+18:13:28.9 |
HIP 32005 |
24.29 |
| 2026-06-21 00:00 |
06:41:03.16 |
+18:13:33.0 |
HIP 32005 |
21.17 |
| 2026-06-21 12:00 |
06:41:43.93 |
+18:13:36.3 |
HIP 32005 |
22.21 |
| 2026-06-22 00:00 |
06:42:24.73 |
+18:13:38.7 |
HIP 32202 |
13.66 |