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
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
11:01:31.37 |
+16:53:56.6 |
HIP 53965 |
12.84 |
| 2026-07-29 12:00 |
11:02:00.43 |
+16:50:51.0 |
HIP 53965 |
6.15 |
| 2026-07-30 00:00 |
11:02:29.55 |
+16:47:45.0 |
HIP 53965 |
5.16 |
| 2026-07-30 12:00 |
11:02:58.72 |
+16:44:38.8 |
HIP 53965 |
11.49 |
| 2026-07-31 00:00 |
11:03:27.95 |
+16:41:32.4 |
HIP 53965 |
18.83 |
| 2026-07-31 12:00 |
11:03:57.24 |
+16:38:25.7 |
HIP 54089 |
23.10 |
| 2026-08-01 00:00 |
11:04:26.59 |
+16:35:18.7 |
HIP 54089 |
20.57 |
| 2026-08-01 12:00 |
11:04:56.00 |
+16:32:11.5 |
HIP 54089 |
20.76 |
| 2026-08-02 00:00 |
11:05:25.46 |
+16:29:04.1 |
HIP 54089 |
23.63 |
| 2026-08-02 12:00 |
11:05:54.97 |
+16:25:56.4 |
HIP 54089 |
28.39 |
| 2026-08-03 00:00 |
11:06:24.55 |
+16:22:48.5 |
HIP 54089 |
34.27 |
| 2026-08-03 12:00 |
11:06:54.17 |
+16:19:40.4 |
HIP 54398 |
36.11 |
| 2026-08-04 00:00 |
11:07:23.85 |
+16:16:32.1 |
HIP 54459 |
34.51 |
| 2026-08-04 12:00 |
11:07:53.59 |
+16:13:23.5 |
HIP 54459 |
28.77 |
| 2026-08-05 00:00 |
11:08:23.38 |
+16:10:14.7 |
HIP 54459 |
24.22 |
| 2026-08-05 12:00 |
11:08:53.22 |
+16:07:05.7 |
HIP 54573 |
20.98 |
| 2026-08-06 00:00 |
11:09:23.11 |
+16:03:56.4 |
HIP 54573 |
13.42 |
| 2026-08-06 12:00 |
11:09:53.05 |
+16:00:47.0 |
HIP 54573 |
6.55 |
| 2026-08-07 00:00 |
11:10:23.05 |
+15:57:37.4 |
HIP 54573 |
5.41 |
| 2026-08-07 12:00 |
11:10:53.10 |
+15:54:27.5 |
HIP 54573 |
11.83 |
| 2026-08-08 00:00 |
11:11:23.20 |
+15:51:17.5 |
HIP 54573 |
19.38 |
| 2026-08-08 12:00 |
11:11:53.34 |
+15:48:07.3 |
HIP 54758 |
26.78 |
| 2026-08-09 00:00 |
11:12:23.54 |
+15:44:56.9 |
HIP 54758 |
27.79 |
| 2026-08-09 12:00 |
11:12:53.78 |
+15:41:46.3 |
HIP 54879 |
25.16 |
| 2026-08-10 00:00 |
11:13:24.08 |
+15:38:35.5 |
HIP 54879 |
17.64 |
| 2026-08-10 12:00 |
11:13:54.42 |
+15:35:24.5 |
HIP 54879 |
10.76 |
| 2026-08-11 00:00 |
11:14:24.81 |
+15:32:13.4 |
HIP 54879 |
6.91 |
| 2026-08-11 12:00 |
11:14:55.24 |
+15:29:02.1 |
HIP 54879 |
10.35 |
| 2026-08-12 00:00 |
11:15:25.72 |
+15:25:50.7 |
HIP 54879 |
17.18 |
| 2026-08-12 12:00 |
11:15:56.25 |
+15:22:39.1 |
HIP 54975 |
17.51 |
| 2026-08-13 00:00 |
11:16:26.82 |
+15:19:27.3 |
HIP 54975 |
19.47 |
| 2026-08-13 12:00 |
11:16:57.43 |
+15:16:15.5 |
HIP 55120 |
15.36 |
| 2026-08-14 00:00 |
11:17:28.09 |
+15:13:03.4 |
HIP 55120 |
12.98 |
| 2026-08-14 12:00 |
11:17:58.79 |
+15:09:51.3 |
HIP 55120 |
15.21 |
| 2026-08-15 00:00 |
11:18:29.53 |
+15:06:39.0 |
HIP 55120 |
20.61 |
| 2026-08-15 12:00 |
11:19:00.31 |
+15:03:26.6 |
HIP 55120 |
27.38 |
| 2026-08-16 00:00 |
11:19:31.13 |
+15:00:14.1 |
HIP 55432 |
26.97 |
| 2026-08-16 12:00 |
11:20:02.00 |
+14:57:01.4 |
HIP 55432 |
23.08 |
| 2026-08-17 00:00 |
11:20:32.90 |
+14:53:48.7 |
HIP 55432 |
21.67 |
| 2026-08-17 12:00 |
11:21:03.84 |
+14:50:35.9 |
HIP 55432 |
23.21 |
| 2026-08-18 00:00 |
11:21:34.82 |
+14:47:22.9 |
HIP 55522 |
23.26 |
| 2026-08-18 12:00 |
11:22:05.84 |
+14:44:09.9 |
HIP 55522 |
17.73 |
| 2026-08-19 00:00 |
11:22:36.89 |
+14:40:56.8 |
HIP 55522 |
14.86 |