メタデータ
| 項目 |
値 |
| Designation |
231P/LINEAR-NEAT |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2011-05-16T10:36:59.662080Z |
| Orbit solution date (soln_date, UTC) |
2026-07-06T12:12:42Z |
| Obs used |
576 |
| 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) |
2012-06-10.0000000 |
| e |
0.24682371 |
| q (au) |
3.032335 |
| a (au) |
4.026063 |
| i (deg) |
12.325715 |
| Ω (om, deg) |
133.081275 |
| ω (w, deg) |
42.428233 |
| M (ma, deg) |
47.650599 |
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) |
| 2026-09-25 00:00 |
08:49:56.55 |
+14:49:33.2 |
HIP 43360 |
0.31 |
| 2026-09-25 12:00 |
08:50:32.61 |
+14:47:47.5 |
HIP 43360 |
8.89 |
| 2026-09-26 00:00 |
08:51:08.58 |
+14:46:01.9 |
HIP 43360 |
17.76 |
| 2026-09-26 12:00 |
08:51:44.46 |
+14:44:16.2 |
HIP 43360 |
26.61 |
| 2026-09-27 00:00 |
08:52:20.26 |
+14:42:30.5 |
HIP 43679 |
23.95 |
| 2026-09-27 12:00 |
08:52:55.97 |
+14:40:44.8 |
HIP 43679 |
16.80 |
| 2026-09-28 00:00 |
08:53:31.60 |
+14:38:59.2 |
HIP 43679 |
12.10 |
| 2026-09-28 12:00 |
08:54:07.13 |
+14:37:13.5 |
HIP 43679 |
12.84 |
| 2026-09-29 00:00 |
08:54:42.57 |
+14:35:27.9 |
HIP 43779 |
9.25 |
| 2026-09-29 12:00 |
08:55:17.93 |
+14:33:42.3 |
HIP 43779 |
10.87 |
| 2026-09-30 00:00 |
08:55:53.19 |
+14:31:56.7 |
HIP 43779 |
17.40 |
| 2026-09-30 12:00 |
08:56:28.36 |
+14:30:11.2 |
HIP 43833 |
22.69 |
| 2026-10-01 00:00 |
08:57:03.43 |
+14:28:25.8 |
HIP 43833 |
26.91 |
| 2026-10-01 12:00 |
08:57:38.41 |
+14:26:40.4 |
HIP 44082 |
20.87 |
| 2026-10-02 00:00 |
08:58:13.30 |
+14:24:55.1 |
HIP 44082 |
13.69 |
| 2026-10-02 12:00 |
08:58:48.09 |
+14:23:09.9 |
HIP 44082 |
9.39 |
| 2026-10-03 00:00 |
08:59:22.78 |
+14:21:24.8 |
HIP 44082 |
11.70 |
| 2026-10-03 12:00 |
08:59:57.38 |
+14:19:39.8 |
HIP 44082 |
18.22 |
| 2026-10-04 00:00 |
09:00:31.88 |
+14:17:54.9 |
HIP 44082 |
25.94 |
| 2026-10-04 12:00 |
09:01:06.27 |
+14:16:10.2 |
HIP 44361 |
23.98 |
| 2026-10-05 00:00 |
09:01:40.57 |
+14:14:25.6 |
HIP 44361 |
22.14 |
| 2026-10-05 12:00 |
09:02:14.76 |
+14:12:41.1 |
HIP 44446 |
15.58 |
| 2026-10-06 00:00 |
09:02:48.85 |
+14:10:56.8 |
HIP 44446 |
7.23 |
| 2026-10-06 12:00 |
09:03:22.83 |
+14:09:12.7 |
HIP 44446 |
2.07 |
| 2026-10-07 00:00 |
09:03:56.71 |
+14:07:28.8 |
HIP 44446 |
9.88 |
| 2026-10-07 12:00 |
09:04:30.49 |
+14:05:45.1 |
HIP 44604 |
14.19 |
| 2026-10-08 00:00 |
09:05:04.15 |
+14:04:01.6 |
HIP 44604 |
11.06 |
| 2026-10-08 12:00 |
09:05:37.71 |
+14:02:18.3 |
HIP 44604 |
13.49 |
| 2026-10-09 00:00 |
09:06:11.16 |
+14:00:35.2 |
HIP 44604 |
19.48 |
| 2026-10-09 12:00 |
09:06:44.50 |
+13:58:52.4 |
HIP 44831 |
20.20 |
| 2026-10-10 00:00 |
09:07:17.72 |
+13:57:09.8 |
HIP 44831 |
12.98 |
| 2026-10-10 12:00 |
09:07:50.83 |
+13:55:27.5 |
HIP 44831 |
8.04 |
| 2026-10-11 00:00 |
09:08:23.83 |
+13:53:45.5 |
HIP 44831 |
9.76 |
| 2026-10-11 12:00 |
09:08:56.72 |
+13:52:03.7 |
HIP 44831 |
16.09 |
| 2026-10-12 00:00 |
09:09:29.48 |
+13:50:22.3 |
HIP 44831 |
23.55 |
| 2026-10-12 12:00 |
09:10:02.14 |
+13:48:41.2 |
HIP 44956 |
28.30 |
| 2026-10-13 00:00 |
09:10:34.67 |
+13:47:00.4 |
HIP 45065 |
28.59 |
| 2026-10-13 12:00 |
09:11:07.08 |
+13:45:19.9 |
HIP 45065 |
30.78 |
| 2026-10-14 00:00 |
09:11:39.38 |
+13:43:39.7 |
HIP 45065 |
34.72 |
| 2026-10-14 12:00 |
09:12:11.55 |
+13:42:00.0 |
HIP 45295 |
38.87 |
| 2026-10-15 00:00 |
09:12:43.61 |
+13:40:20.6 |
HIP 45295 |
36.11 |
| 2026-10-15 12:00 |
09:13:15.54 |
+13:38:41.5 |
HIP 45300 |
32.28 |
| 2026-10-16 00:00 |
09:13:47.34 |
+13:37:02.9 |
HIP 45300 |
29.17 |