187P/LINEAR
メタデータ
| 項目 |
値 |
| Designation |
187P/LINEAR |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-10-22T14:00:37.010880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:27:48Z |
| Obs used |
296 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
16.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2011-02-09.0000000 |
| e |
0.17318236 |
| q (au) |
3.715328 |
| a (au) |
4.493528 |
| i (deg) |
13.655086 |
| Ω (om, deg) |
111.736093 |
| ω (w, deg) |
134.735817 |
| M (ma, deg) |
86.856101 |
等級
散乱 + 全体線形
$$
M_a = (7.415 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
7.415 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| 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 |
10:35:29.87 |
+20:41:17.7 |
HIP 51964 |
25.87 |
| 2026-02-03 12:00 |
10:35:15.63 |
+20:43:58.7 |
HIP 51964 |
27.22 |
| 2026-02-04 00:00 |
10:35:01.25 |
+20:46:39.8 |
HIP 51641 |
27.80 |
| 2026-02-04 12:00 |
10:34:46.72 |
+20:49:20.8 |
HIP 51641 |
24.02 |
| 2026-02-05 00:00 |
10:34:32.06 |
+20:52:01.8 |
HIP 51641 |
20.42 |
| 2026-02-05 12:00 |
10:34:17.25 |
+20:54:42.7 |
HIP 51641 |
17.15 |
| 2026-02-06 00:00 |
10:34:02.31 |
+20:57:23.5 |
HIP 51641 |
14.45 |
| 2026-02-06 12:00 |
10:33:47.24 |
+21:00:04.1 |
HIP 51641 |
12.71 |
| 2026-02-07 00:00 |
10:33:32.03 |
+21:02:44.6 |
HIP 51641 |
12.36 |
| 2026-02-07 12:00 |
10:33:16.70 |
+21:05:24.9 |
HIP 51641 |
13.55 |
| 2026-02-08 00:00 |
10:33:01.25 |
+21:08:05.0 |
HIP 51641 |
15.94 |
| 2026-02-08 12:00 |
10:32:45.67 |
+21:10:44.9 |
HIP 51641 |
19.10 |
| 2026-02-09 00:00 |
10:32:29.98 |
+21:13:24.4 |
HIP 51641 |
22.73 |
| 2026-02-09 12:00 |
10:32:14.17 |
+21:16:03.7 |
HIP 51641 |
26.64 |
| 2026-02-10 00:00 |
10:31:58.25 |
+21:18:42.6 |
HIP 51641 |
30.73 |
| 2026-02-10 12:00 |
10:31:42.22 |
+21:21:21.2 |
HIP 51641 |
34.95 |
| 2026-02-11 00:00 |
10:31:26.08 |
+21:23:59.3 |
HIP 51567 |
38.95 |
| 2026-02-11 12:00 |
10:31:09.84 |
+21:26:37.1 |
HIP 51567 |
37.36 |
| 2026-02-12 00:00 |
10:30:53.51 |
+21:29:14.4 |
HIP 51567 |
36.30 |
| 2026-02-12 12:00 |
10:30:37.08 |
+21:31:51.2 |
HIP 51567 |
35.82 |
| 2026-02-13 00:00 |
10:30:20.56 |
+21:34:27.5 |
HIP 51567 |
35.96 |
| 2026-02-13 12:00 |
10:30:03.95 |
+21:37:03.3 |
HIP 51567 |
36.71 |
| 2026-02-14 00:00 |
10:29:47.25 |
+21:39:38.5 |
HIP 51187 |
33.92 |
| 2026-02-14 12:00 |
10:29:30.47 |
+21:42:13.2 |
HIP 51187 |
30.37 |
| 2026-02-15 00:00 |
10:29:13.62 |
+21:44:47.2 |
HIP 51187 |
27.15 |
| 2026-02-15 12:00 |
10:28:56.70 |
+21:47:20.5 |
HIP 51187 |
24.39 |
| 2026-02-16 00:00 |
10:28:39.70 |
+21:49:53.2 |
HIP 51187 |
22.26 |
| 2026-02-16 12:00 |
10:28:22.64 |
+21:52:25.2 |
HIP 51187 |
20.97 |
| 2026-02-17 00:00 |
10:28:05.51 |
+21:54:56.4 |
HIP 51187 |
20.68 |
| 2026-02-17 12:00 |
10:27:48.33 |
+21:57:26.9 |
HIP 51187 |
21.43 |
| 2026-02-18 00:00 |
10:27:31.09 |
+21:59:56.6 |
HIP 51085 |
20.77 |
| 2026-02-18 12:00 |
10:27:13.80 |
+22:02:25.5 |
HIP 51085 |
19.12 |
| 2026-02-19 00:00 |
10:26:56.47 |
+22:04:53.5 |
HIP 51085 |
18.55 |
| 2026-02-19 12:00 |
10:26:39.09 |
+22:07:20.7 |
HIP 51085 |
19.13 |
| 2026-02-20 00:00 |
10:26:21.67 |
+22:09:46.9 |
HIP 51132 |
17.71 |
| 2026-02-20 12:00 |
10:26:04.22 |
+22:12:12.3 |
HIP 51132 |
17.27 |
| 2026-02-21 00:00 |
10:25:46.74 |
+22:14:36.7 |
HIP 51132 |
18.09 |
| 2026-02-21 12:00 |
10:25:29.23 |
+22:17:00.1 |
HIP 51132 |
20.03 |
| 2026-02-22 00:00 |
10:25:11.70 |
+22:19:22.5 |
HIP 51132 |
22.79 |
| 2026-02-22 12:00 |
10:24:54.14 |
+22:21:43.9 |
HIP 51132 |
26.12 |
| 2026-02-23 00:00 |
10:24:36.58 |
+22:24:04.2 |
HIP 51132 |
29.83 |
| 2026-02-23 12:00 |
10:24:19.00 |
+22:26:23.5 |
HIP 51132 |
33.77 |
| 2026-02-24 00:00 |
10:24:01.42 |
+22:28:41.6 |
HIP 51132 |
37.88 |